JP2021018976A - Lighting device - Google Patents

Abstract

To provide a lighting device easy to attain both of favorable narrow angle characteristics and prevention of center vent and easy to emit light from a light source to an irradiation area without loss.SOLUTION: A lighting device 1 includes: a housing 10; a light source 22 fixed in the housing 10 and emitting light; a fixed lens 40 fixed in the housing 10 and having a light emission surface 88 located closer to a light emitting side in a Z direction (optical axis direction) than the light source 22; and a moving lens 60 which has a light projection surface 87 arranged closer to the light emitting side in the Z direction than the fixed lens 40 and in which the Z-direction distance to the light source 22 is variable. The light emission surface 88 is formed into a protruding surface while a light incident surface 86 of the fixed lens 40 is almost a flat surface. A first projection area of an orthogonal projection of the fixed lens 40 to a perpendicular flat surface perpendicular to the Z direction has a second projection area or larger of the orthogonal projection of the light source 22 to the perpendicular flat surface.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a lighting device.

Conventionally, as the lighting, there is one described in Patent Document 1. This illuminating device includes a base, a light source module, a first cylindrical member, a second cylindrical member, a lens holder, and a lens. The base constitutes the upper side of the housing and has a plurality of fins on the side opposite to the light emitting side. Further, the light source module is fixed to the end surface (main surface) of the base on the light emitting side, and emits light to the side opposite to the fin side in the optical axis direction. The first cylindrical member is fixed to the base so as not to be relatively movable. Further, the second cylindrical member is attached to the first cylindrical member so as to be relatively movable in the optical axis direction, and when rotated with respect to the first cylindrical member, the height position with respect to the first cylindrical member changes. The lens holder constitutes the lower side of the housing of the illuminating device, and is fixed to the radial outside of the second cylindrical member so as not to be relatively movable. Further, the lens is fixed inside the lens holder so as not to be relatively movable. The lens is located on the light emitting side of the light source module in the optical axis direction. In this lighting device, the height position of the lens holder with respect to the base can be changed by rotating the lens holder with respect to the base, and the position of the lens in the optical axis direction with respect to the light source module can be appropriately adjusted. Therefore, it is possible to adjust the angle performance of the emitted light, increase the degree of freedom in controlling the light distribution, and easily realize the desired light distribution.

Japanese Patent No. 6159460

In the above-mentioned lighting device, when trying to improve the narrow angle characteristic (the characteristic that the lens narrows the light distribution area at a position away from the light source), the drop in the irradiation light (the phenomenon that the central part of the irradiation area becomes dark) is caused. It tends to occur at the position in the optical axis direction in the mid-angle region of the lens. On the other hand, if an attempt is made to suppress the occurrence of a drop in the lens, the narrow angle characteristic tends to deteriorate. Further, it is preferable that the light from the light source can be emitted to the irradiation region without loss.

Therefore, an object of the present disclosure is to provide an illuminating device that can easily realize both good narrow-angle characteristics and suppression of drop-in, and can easily emit light from a light source to an irradiation region without loss.

In order to solve the above problems, the lighting device according to the present disclosure includes a housing, a light source fixed in the housing and emitting light, and a moving lens in which the distance between the light source and the light source in the optical axis direction can be changed. The illuminance at the center of the irradiation surface of the irradiation light emitted from the lens is lower than the illuminance at the periphery, which suppresses the dropout, and the narrow angle characteristic that reduces the area of the irradiation surface of the irradiation light can also be suppressed. It is provided with a means for improving the angle drop.

Further, the lighting device according to the embodiment of the present disclosure is located in a housing, a light source fixed in the housing and emitting light, and fixed in the housing on the light emitting side in the optical axis direction with respect to the light source. A fixed lens having a light emitting surface and a moving lens having a light projecting surface arranged on the light emitting side in the optical axis direction of the fixed lens and having a variable distance from the light source in the optical axis direction are provided. The light incident surface of the fixed lens is substantially flat, while the light emitting surface is convex, and the first projected area of the normal projection of the fixed lens with respect to the vertical plane perpendicular to the optical axis direction is the first projected area of the light source with respect to the vertical plane. It is equal to or larger than the second projected area of normal projection. The optical axis direction is the direction of the optical axis of the fixed lens, and substantially coincides with the direction of the optical axis of the moving lens.

According to the lighting apparatus according to the present disclosure, it is easy to realize both good narrow-angle characteristics and suppression of drop-in, and it is easy to emit light from a light source to an irradiation region without loss.

It is a perspective view of the lighting apparatus which concerns on 1st Embodiment of this disclosure. It is a perspective view of the optical axis adjustment member of the said lighting apparatus. It is an exploded perspective view of the main part of the said lighting apparatus. It is sectional drawing in the cut surface including the optical axis direction of the main part of the said lighting apparatus. It is a perspective view when the fixed lens assembly attached to the housing of the said lighting apparatus is seen from the lower side. It is a perspective view of the fixed lens of the said lighting apparatus. It is a perspective view of the lens mounting member of the said lighting apparatus. It is a perspective view which shows the lens mounting member in the state which the fixed lens is placed on the upper side. It is a perspective view of the fixed lens assembly of the said lighting apparatus. It is a perspective view when the fixed lens assembly which removed the lens mounting member is seen from the lower side. It is a perspective view of the fixed lens assembly in which the fixed lens is further removed from the state shown in FIG. 10 when viewed from below. It is a perspective view when the fixed lens assembly which removed the light source module is seen from the upper side. It is a perspective view when the substrate holder which held the light source module is seen from the upper side. It is a perspective view of an optical block composed of a lens holder and a moving lens held by the lens holder. It is a perspective view of the lens holder of the said lighting apparatus. It is a perspective view of the moving lens of the said lighting apparatus. It is a perspective view of the rotating member of the said lighting apparatus. It is a perspective view of the moving lens assembly which is formed by integrally integrating an optical block and a rotating member. It is a perspective view of the 1st member of the housing of the said lighting apparatus. It is a perspective view of the said lighting apparatus when viewed from the angle different from FIG. It is a schematic cross-sectional view for demonstrating the dimensions of a light source, a fixed lens, and a moving lens. (A) is a schematic diagram showing the light distribution at a narrow angle in the lighting device, and (b) is a schematic diagram showing the light distribution at a narrow angle in the lighting device of the reference example, which differs only in that the lighting device and the fixed lens do not exist. It is a schematic diagram which shows the light distribution at a medium angle and a wide angle. Further, (c) is a schematic diagram showing the light distribution at the narrow angle, the medium angle, and the wide angle in the lighting device. It is a perspective view of the lighting apparatus which concerns on 2nd Embodiment of this disclosure. It is an exploded perspective view of the main part of the lighting apparatus of 2nd Embodiment. It is a perspective view when the housing of the lighting apparatus of 2nd Embodiment is seen from the light emitting side. It is a perspective view of the fixed lens assembly of the lighting apparatus of 2nd Embodiment. FIG. 6 is a perspective view showing a state in which the fixed lens and the lens mounting member are removed from the fixed lens assembly shown in FIG. 26. It is a perspective view of the moving lens assembly of the lighting apparatus of 2nd Embodiment. It is a perspective view of the C type retaining ring of the lighting apparatus of 2nd Embodiment. It is a figure explaining the attachment structure of the rotating member with respect to the housing in 2nd Embodiment. It is a perspective view when the fixed lens of the lighting apparatus of 2nd Embodiment is seen from the light emitting side in the optical axis direction. It is a schematic cross-sectional view which shows the light source module and the fixed lens in the lighting device which can be made. It is a perspective view of the lighting apparatus which concerns on 3rd Embodiment of this disclosure. It is a perspective view when the lighting apparatus of 3rd Embodiment is seen from another direction. It is an exploded perspective view of the main part of the lighting apparatus of 3rd Embodiment. It is a perspective view of the moving lens assembly which is included in the lighting apparatus of 3rd Embodiment, and is assembled with a C type retaining ring. It is a perspective view when the moving lens of the lighting apparatus of 3rd Embodiment is seen from the light incident side. It is a perspective view when the moving lens of the lighting apparatus of 3rd Embodiment is seen from the light emitting side. It is sectional drawing when the moving lens of the lighting apparatus of 3rd Embodiment is cut by the plane passing through the optical axis. It is a perspective view when the housing of the lighting apparatus of 3rd Embodiment is seen from the lower side in the optical axis direction. It is a perspective view of the lens holder of the lighting apparatus of 3rd Embodiment. It is a figure explaining the dimensional relation which is preferable about the housing, the moving lens, and the lens holder about the lighting apparatus of 3rd Embodiment. It is a perspective view of the lighting apparatus which concerns on 4th Embodiment of this disclosure. It is an exploded perspective view of the main part of the main body part in the lighting apparatus of 4th Embodiment. It is a perspective view of the moving lens assembly which is included in the illuminating device of 4th Embodiment, and is assembled with a C type retaining ring. It is a perspective view when the moving lens of the lighting apparatus of 4th Embodiment is seen from the upper side in the optical axis direction. FIG. 5 is a perspective view of the lighting device of the fourth embodiment when the state in which the inner member to which the light source module is fixed is fixed to the outer cylinder member is viewed from the lower side in the Z direction of the outer cylinder member. It is a perspective view of the lens holder of the lighting apparatus of 4th Embodiment. It is a perspective view for demonstrating the relative position of the light source module with respect to the moving lens with respect to the lighting apparatus of 4th Embodiment, and is the perspective view when the moving lens and the light source module are seen from the oblique lower side of the moving lens. It is a perspective view for demonstrating the relative position of the light source module with respect to the moving lens about the lighting apparatus of 4th Embodiment, and is the top view when the moving lens and the light source module are seen from above in the Z direction.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In addition, when a plurality of embodiments and modifications are included in the following, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the characteristic portions thereof. Further, in the following examples, the same components are designated by the same reference numerals in the drawings, and duplicate description will be omitted. In addition, the dimensional ratios such as length, width, and height of each member do not always match between different drawings. Further, in the drawings and the following description, the R direction is the radial direction of the main bodies 41,141 of the fixed lenses 40,148 described below, and the θ direction is the circumference of the main bodies 41,141 of the fixed lenses 40,148. The direction. Further, the Z direction is the direction of the optical axis of the fixed lenses 40,148 described below, coincides with the height direction of the housings 10,130, and extends in the central axis of the moving lenses 60,163, that is, The directions of the optical axes of the moving lenses 60 and 163 are also substantially the same. The R, θ, and Z directions are orthogonal to each other.

Further, in the following description, the upper side refers to the side opposite to the light emitting side in the optical axis direction, and the lower side refers to the light emitting side in the optical axis direction. Further, the inclined groove described below has a structure in which the inclined groove is inclined in the Z direction and has a pair of inner wall surfaces facing each other, and at least a part of the fitting portions located between the pair of inner wall surfaces is paired. By guiding with the inner wall surface of the above, the fitting portion is defined as a structure capable of moving along the extending direction of the pair of inner wall surfaces. Therefore, the inclined groove may have a structure having a bottom portion, but has a structure of a through hole having an elongated elongated hole shape inclined with respect to the optical axis direction like the inclined groove 81 described below, and rotates. The side wall of the member or the optical block may be penetrated in the thickness direction. Further, among the components described below, the components not described in the independent claims indicating the highest level concept are arbitrary components and are not essential components. In addition, when the word "abbreviation" is used in this specification, it is used in the same meaning as the word "roughly speaking", and the requirement "abbreviation" is used if the person looks like "abbreviation". It is filled. For example, the requirement of a substantially circular shape is met if a person looks roughly circular.

(First Embodiment)
FIG. 1 is a perspective view of the lighting device 1 according to the first embodiment of the present disclosure. As shown in FIG. 1, the lighting device 1 is an embedded universal downlight, which is embedded in the ceiling of a building such as a hall and can change the optical axis direction of the emitted light emitted downward. More specifically, as shown in FIG. 1, the lighting device 1 includes a housing 10. The housing 10 has a bottomed tubular portion 11. The housing 10 functions as a mounting base for mounting the light source 22 (see FIGS. 4 and 11) in the bottomed tubular portion 11, and is stationary with respect to the light source 22. The housing 10 has a plurality of fins 12 projecting upward, and the entire housing also functions as a heat sink for dissipating heat generated by the light source 22, and in particular, the fins 12 dissipate heat from the light source 22 to the outside air. To do. Therefore, it is preferable that the housing 10 is made of a material having high thermal conductivity such as a metal material. The housing 10 is formed by integrally molding the bottomed tubular portion 11 and the fins 12 with, for example, aluminum die casting. The housing may be configured to join the bottomed tubular portion and the fins. In this case, for example, the bottomed tubular portion and the fin may be connected by inserting the protrusion provided in the bottomed tubular portion into the hole provided in the fin and then plastically deforming the protrusion. The housing does not have to have fins.

The lighting device 1 further includes a spring mounting member 15, an optical axis adjusting member 17, and a frame body 20. Each of the spring mounting member 15, the optical axis adjusting member 17, and the frame body 20 is preferably formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate. The housing 10, the spring mounting member 15, the optical axis adjusting member 17, and the frame 20 are integrated as shown below. Specifically, as shown in FIG. 1, the spring mounting member 15 includes an annular flat plate portion 15a and three spring mounting portions 15b, and the three spring mounting portions 15b have substantially the same spacing in the circumferential direction of the annular flat plate portion 15a. It protrudes downward from the annular flat plate portion 15a in the state of being covered. Further, the frame body 20 is a tubular member and includes an annular disk-shaped upper end surface (not shown). Further, as shown in FIG. 2, that is, the perspective view of the optical axis adjusting member 17, the optical axis adjusting member 17 includes an annular flat plate portion 17a, an upper housing fixing portion 17b, and a lower housing fixing portion 17c. Including, the upper housing fixing portion 17b protrudes upward from the annular flat plate portion 17a, while the lower housing fixing portion 17c protrudes downward from the annular flat plate portion 17a.

Again, referring to FIG. 1, the annular flat plate portion 15a is framed with the annular flat plate portion 17a of the optical axis adjusting member 17 sandwiched between the annular flat plate portion 15a of the spring mounting member 15 and the upper end surface of the frame body 20. It is fixed to the upper end face of the body 20 with screws 23. With this fixing, the spring mounting member 15, the optical axis adjusting member 17, and the frame body 20 are integrated. As shown in FIG. 2, the upper housing fixing portion 17b has a long hole 17d, and the lower housing fixing portion 17c has a cylindrical hole 17e. With reference to FIG. 1, the optical axis adjusting member 17 is screwed to the housing 10 with screws 16 using the elongated holes 17d, and is screwed to the housing 10 with screws not shown using the cylindrical holes 17e (see FIG. 2). It is screwed to 10.

The illuminating device 1 further includes three mounting springs 28. The three mounting springs 28 are arranged at substantially equal intervals in the θ direction, and each mounting spring 28 is fixed to the spring mounting portion 15b. The mounting spring 28 is composed of, for example, a metal plate having a bent portion, and has a leaf spring structure. The mounting spring 28 is distorted to displace the mounting spring 28 so that the root side portion 28a of the mounting spring 28 extends along the periphery of the embedding hole in the height direction of the embedding hole, and at least a part of the root side portion 28a. Presses the inner peripheral surface of the embedding hole radially outward. Then, the stationary portion 28b located on the tip side of the root side portion 28a extends outward from the embedding hole in the radial direction and is stationary in the ceiling along the ceiling. In this way, the mounting spring 28 is fixed around the embedding hole. As described above, the spring mounting portion 15b is fixed to the frame body 20. Therefore, the frame body 20 is fixed around the embedding hole. Since the mounting spring 28 is mounted on the frame body 20, it rests on the frame body 20 and also rests on the embedded hole in the ceiling. Two or four or more mounting springs may be provided. Further, the structure for mounting the lighting device on the ceiling may be any structure as long as the lighting device can be fixed to the ceiling, and the mounting spring may not be included.

As shown in FIG. 1, in a state where the extending directions of the central axes of the frame body 20 substantially coincide with the Z direction, the housing 10 is fixed to the right end of the elongated hole 17d on the paper surface by the screw 16. With the frame body 20 fixed to the embedding hole using the mounting spring 28, the user applies a force equal to or greater than the static friction force generated by the tightening force of the screw 16 to the upper housing fixing portion 17b to the housing 10. It is assumed that it has been granted. Then, the housing 10 is used for adjusting the optical axis so that the screw 16 moves in the elongated hole 17d to the left side of FIG. 1 with the cylindrical hole 17e and the screw (not shown) tightened in the housing 10 as a fulcrum. It rotates with respect to the member 17. In other words, since the optical axis adjusting member 17 is fixed so as not to be movable relative to the frame body 20, the housing 10 is inclined with respect to the frame body 20.

Therefore, the user can adjust the housing 10 so as to incline at a desired angle with respect to the frame 20 after the lighting device 1 is fixed in the embedding hole, and the light source 22 fixed to the housing 10 (FIGS. 4, 4, The optical axis of the emitted light from (see FIG. 11) (which substantially coincides with the optical axis of the fixed lens 40 described later) can be tilted by a desired angle with respect to the vertical direction. Therefore, the degree of freedom of the irradiation area can be remarkably increased. Although the case where the lighting device 1 is a universal downlight capable of adjusting the optical axis direction with respect to the vertical direction has been described, the lighting device may have a configuration in which the optical axis direction with respect to the vertical direction cannot be adjusted.

FIG. 3 is an exploded perspective view of a main part of the lighting device 1, and FIG. 4 is a cross-sectional view of a cut surface of the main part including the Z direction. As shown in FIG. 3, the lighting device 1 includes a housing 10, a light source module 25, a substrate holder 30, a fixed lens 40, a holder fixing member 42, a lens mounting member 45 (see FIG. 7), a moving lens 60, and an annular lens. It includes a holder 70 and an annular rotating member 80. The substrate holder 30 holds the substrate 21 of the light source module 25, and the holder fixing member 42 is used when fixing the substrate holder 30 to the upper end surface (main surface) inside the housing. Further, the lens mounting member 45 is used to mount the fixed lens 40 arranged under the substrate 21 on the substrate holder 30, and the lens holder 70 holds the moving lens 60. Further, the rotating member 80 has a substantially tubular shape, and plays a role of moving the lens holder 70 with respect to the housing 10 in the optical axis direction.

As shown in FIG. 4, the fixed lens 40 is arranged below the light source module 25, and the moving lens 60 is arranged below the fixed lens 40. More precisely, the light emitting surface (end surface on the light emitting side in the Z direction) 88 of the fixed lens 40 is arranged on the light emitting side (lower side in the Z direction) in the Z direction with respect to the light source module 25, and the moving lens 60 The light projecting surface (end surface on the light emitting side in the Z direction) 87 is arranged on the light emitting side in the Z direction (lower side in the Z direction) with respect to the fixed lens 40. Further, the lens holder 70 is arranged on the outer diameter side of the moving lens 60 so as to surround the moving lens 60, and the rotating member 80 is arranged on the outer diameter side of the lens holder 70 so as to surround the lens holder 70.

As shown in FIG. 4, the light incident surface 86 of the fixed lens 40 is formed of a substantially flat surface and extends in a direction substantially orthogonal to the Z direction. On the other hand, the light emitting surface 88 of the fixed lens 40 is a convex surface that is convex downward in the Z direction. The main body 41 of the fixed lens 40 and the moving lens 60 are each made of a translucent material having translucency. More specifically, in this embodiment, the main body 41 of the fixed lens 40 is made of a transparent silicone resin, and the moving lens 60 is made of a transparent resin such as acrylic or polycarbonate or a glass material. The main body of the fixed lens and the moving lens may each be made of a transparent resin material such as acrylic, polycarbonate, or silicone, or a glass material.

As shown in FIG. 4, the rotating member 80 has an inner peripheral surface 85 arranged so as to surround the moving lens 60. All of the inner peripheral surfaces 85 form a low reflectance inner surface portion. Specifically, the rotating member 80 is made of a colored, particularly preferably black resin, or the inner peripheral surface 85 of the rotating member 80 is painted colored, particularly preferably black. .. Therefore, the light reflectance of the inner peripheral surface 85 is 15% or less. The light reflectance of the inner peripheral surface 85 is preferably 10% or less, more preferably 5% or less, and most preferably 0%.

According to this configuration, light is less likely to be reflected by the inner peripheral surface 85, and light can be absorbed by the inner peripheral surface 85. Therefore, it is possible to reduce the glare when a person looks up at the lighting device 1. The case where all of the inner peripheral surface 85 constitutes a low reflectance inner surface portion and the light reflectance of all of the inner peripheral surfaces 85 is 15% or less has been described, but the light reflectance is the inner peripheral surface. It does not have to be 15% or less in all of. Specifically, the inner peripheral surface surrounding the moving lens is a low-reflectance inner surface portion having a light reflectance of 15% or less in a portion located on the light emitting side of the position where the moving lens is most moved to the light source side in the Z direction. Should be included. Alternatively, the light reflectance may be greater than 15% on all of the inner peripheral surfaces.

FIG. 5 is a perspective view of the fixed lens assembly 90 attached to the housing 10 when viewed from below. The light source module (see FIG. 3) 25, the substrate holder 30, the fixed lens 40, the holder fixing member 42, and the lens mounting member 45 are integrated and integrated. The fixed lens assembly 90 includes an integrated structure thereof. In the following, first, the structure of the fixed lens assembly 90 will be described, and the fixed structure of the fixed lens assembly 90 with respect to the housing 10 will also be described.

FIG. 6 is a perspective view of the fixed lens 40, and FIG. 7 is a perspective view of the lens mounting member 45. 8 is a perspective view of the lens mounting member 45 with the fixed lens 40 mounted on the upper side, and FIG. 9 is a perspective view of the fixed lens assembly 90. As shown in FIG. 6, the fixed lens 40 has a main body 41 and a pair of holding portions 53, 54. The fixed lens 40 is formed by, for example, two-color molding, and the main body 41 and the pair of holding portions 53, 54 are formed of different materials. The transmittance of the main body 41 is higher than the transmittance of the pair of holding portions 53, 54. As described above, in this embodiment, the main body 41 of the fixed lens 40 is formed of a transparent silicone resin, but the holding portions 53 and 54 of the fixed lens 40 are made of a transparent or non-transparent silicone resin. Is preferable. The holding portions 53 and 54 of the fixed lens 40 may be made of a transparent resin material such as acrylic, polycarbonate, or silicone, a non-transparent resin material, or a glass material. Further, the main body 41 and the pair of holding portions 53, 54 may be formed of the same transparent material or may have the same transmittance.

The main body 41 has a substantially circular shape when viewed from the optical axis direction. The main body 41 has the above-mentioned substantially flat light incident surface 86, the above-mentioned light emitting surface 88 (see FIG. 4) which is a convex surface convex downward in the Z direction, and further has a conical outer peripheral surface 63. The light incident surface 86 is formed of a substantially circular plane, and the extending direction of the central axis of the conical outer peripheral surface 63 substantially coincides with the Z direction. On the other hand, the pair of holding portions 53, 54 are arranged to face each other in the R direction so as to sandwich the central axis of the main body 41, and the holding portions 53, 54 extend outward from the conical outer peripheral surface 63 in the R direction. Each of the holding portions 53 and 54 protrudes radially from the first edge portion 41a of the main body 41, more specifically, from the first edge portion 41a of the conical outer peripheral surface 63. One holding portion 53 has a first radial extending portion 55 projecting radially from the first edge portion 41a of the main body 41 and a first L-shaped portion 56. Further, the first L-shaped portion 56 includes a first orthogonal extending portion 56a extending in the orthogonal direction orthogonal to the first radial extending portion 55 from the tip end portion of the first radial extending portion 55, and a first. The second radial extending portion 56b extending substantially parallel to the first radial extending portion 55 from the tip end portion of the orthogonal extending portion 56a on the side opposite to the first radial extending portion 55 side is included. The first through hole 56c is provided in the second radial extending portion 56b.

Similarly, the other holding portion 54 is radially opposed to the first edge portion 41a of the main body 41 in the radial direction from the second edge portion 41b, more specifically, the second edge portion 41b of the conical outer peripheral surface 63. Protrude. The other holding portion 54 has a third radial extending portion 57 projecting radially from the second edge portion 41b and a second L-shaped portion 58. Further, the second L-shaped portion 58 has a second orthogonal extending portion 58a extending in a direction orthogonal to the third radial extending portion 57 from the tip end portion of the third radial extending portion 57. The extension portion 58a includes a fourth radial extension portion 58b extending substantially parallel to the third radial extension portion 57 from a tip portion on the side opposite to the third radial extension portion 57 side. A second through hole 58c is provided in the fourth radial extending portion 58b. The first radial extending portion 55 and the third radial extending portion 57 are located on the same first straight line passing through the center of the main body 41 in a plan view when viewed from the Z direction. Further, the second straight line connecting the center of the first through hole 56c and the center of the second through hole 58c in a plan view when viewed from the Z direction passes through the center of the main body 41 and is inclined to the first straight line. ..

As shown in FIG. 7, the lens mounting member 45 has a plane-symmetrical structure, and has a ring portion 50, two lens support portions 51, and two holder locking portions 52. The lens support portion 51 has recesses 59 that protrude outward from the ring portion 50 in the radial direction and open on both sides in the R direction and the upper side in the Z direction. Further, the lens support portion 51 has a flat surface portion 51a located on the same plane as the bottom surface 59a of the recess 59. Further, the holder locking portion 52 protrudes outward in the R direction from the end surface of the lens support portion 51 on the outer side in the R direction. The length a of the recess 59 in the orthogonal direction orthogonal to both the R direction and the Z direction is the first radial extending portion 55 of the holding portion 53 (see FIG. 6) (the third radial extending portion of the holding portion 54). It is larger than the width b of 57).

Each holder locking portion 52 includes a first flat plate portion 46 extending in a direction orthogonal to the Z direction and a second flat plate portion 47 extending upward in the Z direction from the outer end portion of the first flat plate portion 46 in the R direction. Have. The first flat plate portion 46 is provided with a through hole 66 that penetrates the first flat plate portion 46 in the Z direction. Further, a pair of columnar portions 64a and 64b project upward in the Z direction from both sides of the through hole 66 in the first flat plate portion 46 in the orthogonal direction. On the other hand, the second flat plate portion 47 has a recess 48 that communicates with the through hole 66 and opens downward in the Z direction. The bottom surface of the recess 48 is a locking end surface 65 facing downward in the Z direction.

As shown in FIG. 8, the first and third radial extending portions 55 and 57 pass through the recess 59. Further, the portions of the holding portions 53 and 54 on the main body 41 side are placed on the flat surface portion 51a. As described above, in the holding portions 53, 54, the portions connected to the outer ends of the first and third radial extending portions 55, 57 in the R direction are L-shaped. As a result, in the state shown in FIG. 8, when viewed from the Z direction, the holding portions 53 and 54 are present at positions that do not overlap the through holes 66.

FIG. 10 is a perspective view of the fixed lens assembly 90 from which the lens mounting member 45 has been removed when viewed from below. As shown in FIGS. 9 and 10, the substrate holder 30 has a pair of columnar protrusions 31a, 31b that project downward and are inserted into the first and second through holes 56c, 58c. Further, as shown in FIG. 9, the substrate holder 30 has a locking portion 34 extending downward. After the fixed lens 40 is placed on the lens mounting member 45 and is in the state shown in FIG. 8, when the protrusions 31a and 31b are further inserted into the first and second through holes 56c and 58c, As shown in FIG. 9, the locking portion 34 of the substrate holder 30 is housed in the through hole 66 in a state of being positioned by a pair of columnar portions 64a and 64b (see FIG. 7), and the locking claw 34a of the locking portion 34 is accommodated. Is locked to the locking end face 65. As a result, the substrate holder 30, the fixed lens 40, and the lens mounting member 45 are integrally integrated. As shown in FIG. 5, the ring portion 50 of the lens mounting member 45 is located outside the R direction of the main body 41 of the fixed lens 40 in a state where the integrated structure is configured.

Next, the holding of the light source module 25 in the fixed lens assembly 90 and the fixing of the fixed lens assembly 90 to the housing 10 will be described. FIG. 11 is a perspective view of the fixed lens assembly 90 in which the fixed lens 40 is further removed from the state shown in FIG. 10 when viewed from below. Further, FIG. 12 is a perspective view of the fixed lens assembly 90 from which the light source module 25 (see FIG. 11) has been removed, and FIG. 13 is a view of the substrate holder 30 holding the light source module 25 from above. It is a perspective view at the time.

As shown in FIG. 10, when the lens mounting member 45 is removed from the fixed lens assembly 90, the fixed lens 40 is exposed to the outside. The main body 41 of the fixed lens 40 has a light emitting surface 88 formed of the above-mentioned convex surface. As shown in FIGS. 4 and 10, the light emitting surface 88 has an annular tapered surface portion 88a that tapers toward the lower side in the Z direction at the peripheral portion in the radial direction, and is substantially circular in the central portion in the radial direction. Has a flat surface portion 88b. Further, as shown in FIG. 11, when the lens mounting member 45 and the fixed lens 40 are removed from the fixed lens assembly 90, the light source 22 is exposed to the outside. With reference to FIG. 11, the light source module 25 has a substrate 21 and a light source 22. The substrate 21 has a flat plate shape having a substantially rectangular plan view. Further, the light source 22 has a disk-like shape and is arranged substantially in the center of the lower surface (mounting surface) of the substrate 21. The light source module 25 has, for example, a COB (Chip On Board) structure, and the light source 22 includes a plurality of LEDs (light emitting diodes) mounted on a substrate 21 and a sealing member for sealing the plurality of LEDs. ..

The substrate 21 is composed of, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like. Although not described in detail, a pair of electrode terminals and a predetermined pattern of metal wiring are formed on the substrate 21. The pair of electrode terminals are provided to receive DC power for causing the LED to emit light from the outside. Further, the metal wiring of a predetermined pattern is provided to electrically connect the LEDs to each other.

The LED is composed of, for example, a bare chip that emits a single color of visible light, and is composed of a blue LED chip that emits blue light when energized. The plurality of LEDs are arranged in a matrix on the substrate 21, for example. In addition, only one LED may be mounted on the substrate. The sealing member is made of, for example, a translucent resin and contains a phosphor. The phosphor plays a role in wavelength-converting the light from the LED. The sealing member is composed of, for example, a phosphor-containing resin in which phosphor particles are dispersed in a silicone resin. When the light source module 25 is a blue LED chip that emits white light and the LED emits blue light, the phosphor particles are composed of, for example, a YAG-based yellow phosphor.

As the sealing member, all the LEDs may be sealed at once, a plurality of LEDs may be sealed in a line for each row, or each LED may be individually sealed one by one. .. Further, the light source may include a light emitting element other than the LED, and may be composed of a semiconductor laser element, a solid light emitting element such as an organic EL (Electro Luminescence) element or an inorganic EL element, or the like. Alternatively, the light source may be composed of an incandescent lamp, a fluorescent lamp, or the like.

As shown in FIG. 11, two holder fixing members 42 are arranged under the substrate holder 30 at intervals in the longitudinal direction of the substrate holder 30. The holder fixing member 42 has a mounting hole 43, and the mounting hole 43 overlaps with the mounting hole 39 (see FIG. 12) of the substrate holder 30 when viewed from the Z direction, and the main surface 18 of the housing 10 (FIG. 12). It also overlaps with the screw holes (not shown) provided in (see 5). As shown in FIG. 12, the substrate holder 30 has a through hole 37 having a substantially rectangular plan view. When the holder fixing member 42 is arranged at a predetermined position with respect to the board holder 30, the board receiving portion 42a forming a part of the holder fixing member 42 overlaps with the through hole 37 when viewed from the Z direction. The board holder 30 and the holder fixing member 42 define the board accommodating chamber 27.

As shown in FIG. 13, the light source module 25 is housed in the substrate storage chamber 27 (see FIG. 11) with the light source 22 facing downward. With the light source module 25 housed in the board housing chamber 27, a part of the lower surface of the board 21 comes into contact with the board receiving portion 42a (see FIG. 12). Further, the substrate holder 30 accommodating the substrate 21 in the substrate accommodating chamber 27 is integrally integrated with the fixed lens 40 and the lens mounting member 45 as described above. After that, bolts (not shown) are attached from the lower side to the mounting hole 43 (FIG. 11) of the holder fixing member 42, the mounting hole 39 (see FIG. 12) of the board holder 30, and the main surface 18 (see FIG. 5) of the housing 10. ) Is tightened into the screw hole (not shown). By this tightening, the fixed lens assembly 90 (see FIG. 9) is fixed to the main surface 18 of the housing 10.

Again, referring to FIG. 4, with the fixed lens assembly 90 fixed to the main surface 18, the tip surface 29 of the disk-shaped resin mold portion of the light source 22 is the flat surface of the fixed lens 40 with a slight gap. It faces the light incident surface 86 in the Z direction. In this way, the light emitted from the light source 22 and not incident on the fixed lens 40 is reduced to reduce the instrument efficiency, that is, the ratio of the light emitted from the light source 22 to the outside of the illuminating device 1. It's getting bigger. The tip surface 29 of the light source 22 is set so that the Z-direction position on the tip surface 29 of the disk-shaped resin mold portion of the light source 22 coincides with the Z-direction position of the flat light incident surface 86 of the fixed lens 40. However, it may be brought into contact with the light incident surface 86 of the fixed lens 40, and as a result, the instrument efficiency can be further increased.

Further, as described above, the fixed lens 40 is made of a silicone resin and is made of a material containing silicone having excellent heat resistance. In this way, the tip surface 29 of the light source 22 is located near the light incident surface 86 of the fixed lens 40, so that even if the fixed lens 40 becomes hot due to the heat from the light source 22, the fixed lens 40 is heated. It suppresses or prevents deterioration.

Further, the fixed lens 40 has a shore A hardness (JISK6253: 2012) of 50 to 90, and has a large elasticity. More specifically, the fixed lens 40 is made of, for example, a rubber elastic body and is made of a rubber elastic body made of a silicone material. In this way, the tip surface 29 of the light source 22 is arranged in the vicinity of the light incident surface 86 of the fixed lens 40, so that the fixed lens 40 becomes high temperature due to the heat from the LED and thermally expands to the light source 22. Even if it comes into contact with the resin mold portion of the fixed lens 40, the volume increase due to the thermal expansion of the fixed lens 40 is absorbed by the elasticity of the fixed lens 40. Then, excessive stress is prevented from acting on the resin mold portion and the fixed lens 40 that are in contact with each other, and damage to the resin mold portion and the fixed lens 40 is suppressed or prevented. Therefore, the illuminating device 1 has two effects that are in a trade-off relationship (reciprocal relationships with each other), that is, the effect that there is less stray light and the instrument efficiency is excellent, and the resin mold portion and the fixed lens 40 are also damaged. It is possible to simultaneously play the action and effect of being able to suppress, and it is possible to realize a remarkable action and effect.

When the tip surface 29 of the light source 22 is in contact with the light incident surface 86 of the fixed lens 40 and the distance between the light source 22 and the light incident surface 86 in the Z direction is 0 mm, the instrument efficiency can be maximized, which is preferable. However, when the distance between the light source 22 and the light incident surface 86 in the Z direction is 1.5 mm or less, the instrument efficiency can be increased as in the present embodiment, and for example, the Z between the light source 22 and the light incident surface 86 can be increased. The distance in the direction may be set to 1.3 mm or less, 1.0 mm or less, 0.7 mm or less, or 0.5 mm or less. When the distance between the light source 22 and the light incident surface 86 in the Z direction is 0 mm, the distance between the light source 22 and the light incident surface 86 in the Z direction is set to 1 mm in the Z direction by a tolerance. The case where the distance is 0 mm is also included.

Further, in this embodiment, the transmittance of the main body 41 of the fixed lens 40 is higher than the transmittance of the moving lens 60. Further, the refractive index of the fixed lens 40 is smaller than the refractive index of the moving lens 60. Here, when the fixed lens 40 has the main body 41 and the pair of holding portions 53, 54 as in the present embodiment, the refractive index of the fixed lens 40 is smaller than the refractive index of the moving lens 60. The requirement is satisfied that the refractive index of the main body 41 of the fixed lens 40 is smaller than the refractive index of the moving lens 60. More precisely, in the present disclosure, the requirement that the refractive index of the fixed lens is smaller than the refractive index of the moving lens is the refractive index of the portion of the fixed lens whose plan view is substantially circular when viewed from the Z direction. However, it is satisfied that the plane view of the moving lens when viewed from the Z direction is smaller than the refractive index of the substantially circular portion. When the fixed lens 40 has the shape described in this embodiment, the refractive index of the main body 41 of the fixed lens 40 is smaller than the refractive index of the moving lens 60, and the holding portion of the fixed lens 40 is held. The refractive index of 53,54 may also be smaller than the refractive index of the moving lens 60, or the refractive index of the main body 41 of the fixed lens 40 is smaller than the refractive index of the moving lens 60, while The refractive index of the holding portions 53, 54 of the fixed lens 40 may be equal to or higher than the refractive index of the moving lens 60. Further, the fixed lens may have a shape different from that of the present embodiment and may not have a holding portion, and the fixed lens is, for example, a portion having a substantially circular plan view when viewed from the Z direction. May consist of only. When all of the fixed lens 40 is formed of a transparent silicone resin and the moving lens 60 is made of a transparent resin such as acrylic or polycarbonate or a glass material, the refractive index of the fixed lens 40 is smaller than that of the moving lens 60. Can be easily realized. According to this configuration, the traveling direction of the light incident on the fixed lens 40 is less likely to change. Therefore, it is possible to prevent the light incident on the fixed lens 40 from wrapping around to the holding portions 53, 54 (see FIG. 6) and becoming stray light in the illuminating device 1, increasing the efficiency of the fixture, and bright illuminating light. Can be realized.

Further, in this embodiment, the arithmetic mean roughness of the light incident surface 86 is smaller than the arithmetic mean roughness of the light emitting surface 88. The LED has a property that the color of the light around the optical axis is easily different from the color of the light on the peripheral side. For example, in the case of a white LED, the color of the light around the optical axis is close to the desired white color. , It has the property that the light on the peripheral side tends to have a yellowish color. Therefore, when the light source is an LED, color unevenness is likely to occur in the illumination light unless any measures are taken.

On the other hand, in this embodiment, since the arithmetic average roughness of the light incident surface 86 is smaller than the arithmetic average roughness of the light emitting surface 88, it is easy to control the light incident on the light incident surface 86. Not only is it easy to efficiently guide the light to the exit surface 88 side, but also the light emitted from the light emission surface 88 can be easily mixed and mixed. Therefore, it is possible to suppress color unevenness in each irradiation region of the irradiation light and realize a beautiful illumination light.

Next, a structure that enables the moving lens 60 (see FIG. 3) to move in the Z direction will be described. FIG. 14 is a perspective view of an optical block 95 composed of a lens holder 70 and a moving lens 60 held by the lens holder 70, FIG. 15 is a perspective view of the lens holder 70, and FIG. 16 is a perspective view of the moving lens 60. It is a perspective view. As shown in FIG. 14, the lens holder 70 is an annular member and is arranged so as to surround the moving lens 60. The lens holder 70 is preferably formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate.

As shown in FIG. 15, the lens holder 70 has three locking portions 71 arranged at intervals in the circumferential direction, and each locking portion 71 extends in the Z direction. The locking portion 71 includes a concave surface 71a that is convex inward in the R direction, and the concave surface 71a faces outward in the R direction and extends in the Z direction. The role of the locking portion 71 will be described later. Further, the lens holder 70 has three lens fitting portions 73, and the three lens fitting portions 73 are arranged at substantially equal intervals in the θ direction and are arranged on the inner peripheral side. The lens fitting portion 73 is composed of a protruding portion that protrudes inward in the R direction. As shown in FIG. 16, the moving lens 60 has a shape that expands toward the lower side in the Z direction. The moving lens 60 has three holder fitting portions 61 arranged at substantially equal intervals in the θ direction at the lower end portion on the outer peripheral side. The holder fitting portion 61 has a shape corresponding to the shape of the lens fitting portion 73 (see FIG. 15), and is composed of a recess recessed inward in the R direction. By press-fitting the lens fitting portion 73 into the holder fitting portion 61, the moving lens 60 is fixed to the lens holder 70, and as a result, the optical block 95 shown in FIG. 14 is configured.

Next, an integrated structure in which the optical block 95 can move relative to the rotating member 80 will be described. As shown in FIG. 15, the lens holder 70 has two fitting claws 78 on the outer peripheral side. The fitting claw 78 is an example of a fitting portion. The two fitting claws 78 are arranged so as to face each other in the R direction, and each fitting claw 78 has a plate shape having a pair of inclined surfaces 78a and 78b. The inclined surfaces 78a and 78b extend in a direction inclined with respect to the Z direction.

FIG. 17 is a perspective view of the rotating member 80. As shown in FIG. 17, the rotating member 80 is a substantially cylindrical member and has two inclined grooves 81 arranged at intervals in the θ direction. The inclined groove 81 has a shape formed of a part of the spiral groove. The inclined groove 81 is inclined with respect to the Z direction, and extends from the lower side in the Z direction to the upper side in the Z direction of the rotating member 80 toward one side in the θ direction. The inclined groove 81 has an elongated elongated hole-shaped through hole structure penetrating the rotating member 80 in the thickness direction, and includes a pair of inner wall surfaces (inclined surfaces) 81a and 81b facing in the Z direction.

As shown in FIG. 18, the optical block 95 and the rotating member 80 are integrally integrated by fitting the fitting claw 78 projecting outward in the R direction in the optical block 95 into the inclined groove 81 of the rotating member 80. , The moving lens assembly 75 is configured. The fitting claw 78 is movable in the inclined groove 81 in the extending direction of the inclined groove 81. When the optical block 95 rotates relative to the rotating member 80 in the direction shown in θ1 in FIG. 18 from the state shown in FIG. 18, the moving lens 60 moves upward in the Z direction with respect to the rotating member 80. In this way, by adjusting the position of the fitting claw 78 in the inclined groove 81, the position of the moving lens 60 with respect to the rotating member 80 in the Z direction can be adjusted.

Next, the mounting structure of the moving lens assembly 75 with respect to the housing 10 will be described. As shown in FIG. 3, the housing 10 has a two-divided structure and includes a first member 10a and a second member 10b. FIG. 19 is a perspective view of the first member 10a of the housing 10. As shown in FIG. 19, the housing 10 has a plurality of columnar portions (ribs) 97 extending downward from the main surface 18 side in the Z direction. The columnar portion 97 is provided in a stationary portion that is stationary with respect to the light source 22. The tip surface of the columnar portion 97 is a convex surface 97a that is convex inward in the R direction. In this embodiment, the first member 10a shown in FIG. 19 has two columnar portions 97, and the second member 10b (see FIG. 3) has one columnar portion (not shown).

The convex surface 97a of the three columnar portions 97 is locked to the concave surface 71a (see FIG. 18) of the three locking portions 71 of the lens holder 70 included in the moving lens assembly 75. Further, as shown in FIG. 20, that is, a perspective view of the illuminating device 1 when viewed from an angle different from that of FIG. 1, when the first member 10a and the second member 10b are integrated with the screw 98, the moving lens assembly 75 The rotating member 80 included in the housing 10 is rotatably attached to the housing 10 in a state where the position in the Z direction with respect to the housing 10 is almost unchanged. Then, with this attachment, the moving lens assembly 75 is integrated with the housing 10.

More specifically, the attachment of the rotating member 80 to the housing 10 is performed as follows. As shown in FIG. 4, the rotating member 80 has a first annular flange portion 35 and a second annular flange portion 36 located below the first annular flange portion 35 in the Z direction, and the flange portions 35, 36 in the Z direction. An annular groove 38 is provided between them. Further, the housing 10 has an annular projecting portion 13 projecting downward in the Z direction and inward in the R direction. When the first member 10a and the second member 10b are integrated and the housing 10 and the moving lens assembly 75 are integrated, the annular protrusion 13 is accommodated in the annular groove 38. When viewed from the Z direction, the first annular flange portion 35 has a portion that overlaps the annular protrusion portion 13, and the annular end surface 14 located on the lower side in the Z direction in the housing 10 overlaps the second annular flange portion 36. Has a part. As shown in FIG. 4, in a state where the lower surface of the first annular flange portion 35 is in contact with the upper surface of the annular protrusion 13, the annular end surface 14 is placed on the upper surface of the second annular flange portion 36 with a slight gap. Facing in the Z direction. The downward movement of the rotating member 80 with respect to the housing 10 is regulated by the annular protrusion 13, and the upward movement of the rotating member 80 with respect to the housing 10 is regulated by the annular end surface 14 of the housing 10. As a result, the rotating member 80 can rotate relative to the housing 10 in a state where the position in the Z direction does not substantially change with respect to the housing 10. Since the slight gap exists, the rotating member 80 can be smoothly rotated with respect to the housing 10. The Z-direction position of the rotating member 80 with respect to the housing 10 varies by the Z-direction length of the slight gap. Therefore, again, the position of the rotating member 80 with respect to the housing 10 in the Z direction does not substantially change.

Again, with reference to FIG. 17, the rotating member 80 has an annular grip 80a on the lower side in the Z direction for a person to grab and rotate it. As shown in FIG. 4, the grip portion 80a is located below the housing 10 in the Z direction and is exposed to the outside. Therefore, a person can insert a finger into the gap to rotate the grip portion 80a of the rotating member 80, and the rotating member 80 can be freely rotated in both directions in the θ direction with respect to the housing 10. ..

In the above configuration, it is assumed that a person uses the grip portion 80a to rotate the rotating member 80 with respect to the housing 10. Then, since the optical block 95 cannot rotate with respect to the housing 10 due to the locking of the locking portion 71 to the columnar portion 97, the optical block 95 does not rotate with the rotation of the rotating member 80 and rotates. The member 80 rotates relative to the optical block 95. Therefore, due to this relative rotation, the fitting claw 78 moves in the inclined groove 81, and as a result, the optical block 95 moves relative to the rotating member 80 in the Z direction. Therefore, as described above, even if the rotating member 80 rotates, the Z-direction position of the rotating member 80 hardly changes, so that the Z-direction position of the optical block 95 can be freely changed, and the moving lens included therein can be freely changed. The Z-direction position of 60 can also be freely changed.

FIG. 21 is a schematic cross-sectional view for explaining the dimensions of the light source 22, the fixed lens 40, and the moving lens 60. As shown in FIGS. 16 and 21, the moving lens 60 has an annular Fresnel 69 on the upper side in the Z direction and the outer peripheral side in the θ direction. Further, as shown in FIG. 21A, the first projected area S2 of the normal projection of the fixed lens 40 with respect to the vertical plane P perpendicular to the Z direction is the second projected area S1 of the normal projection of the light source 22 with respect to the vertical plane P. That's all. Further, the third projected area S21 of the normal projection of the light incident surface 86 of the fixed lens 40 with respect to the vertical plane P is smaller than the fourth projected area S22 of the normal projection of the light emitting surface 88 with respect to the vertical plane P, and the second projected area. S1 is smaller than the third projected area S21. In this embodiment, the first projected area S2 corresponds to the fourth projected area S22, but the first projected area S2 may be larger than the fourth projected area S22. Further, the fifth projected area S31 of the normal projection of the light receiving surface 83 on the light source 22 side in the Z direction of the moving lens 60 with respect to the vertical plane P is from the sixth projected area S32 of the normal projection of the projection surface 87 with respect to the vertical plane P. Is also small, and the fourth projected area S22 is smaller than the fifth projected area S31.

Further, in this embodiment, the height h1 of the Fresnel 69 is larger than the thickness (height) h2 of the fixed lens 40. Further, as shown in FIG. 21B, at the wide-angle position of the moving lens 60 in which the moving lens 60 has moved to the light source 22 side in the Z direction most, all of the fixed lenses 40 are the inner circumferences of the annular Fresnel 69. It is accommodated in a recess 77 defined by a surface 69a and an end surface 76 on the light source 22 side of the moving lens 60 in the Z direction.

In this embodiment, even if the Z-direction position of the moving lens 60 fluctuates, the Z-direction dimension of the lighting device 1 does not change, so that the lighting device 1 can be made compact and stylish. Here, the case where the inclined groove 81 has a structure of a through hole having an elongated elongated hole shape has been described, but the inclined groove may have a structure having a bottom portion. Further, in the lighting device 1, the optical block is provided with the fitting claw 78, while the rotating member 80 is provided with the inclined groove 81 into which the fitting claw 78 is fitted, so that the moving lens 60 is relative to the fixed lens 40 in the Z direction. Made it possible to move. However, while the rotating member is provided with the fitting claw, the optical block may be provided with an inclined groove into which the fitting claw is fitted so that the moving lens can move relative to the fixed lens in the Z direction. Further, a columnar pin may be fitted in the inclined groove instead of the fitting claw.

Alternatively, the illuminating device of the present disclosure does not have to have the inclined groove 81 unlike the illuminating device 1 of the first embodiment, and the moving lens may be moved in the Z direction without using the inclined groove 81. For example, the illuminating device of the present disclosure employs a configuration disclosed in many publications such as Patent Document 1, that is, a configuration in which the Z-direction dimension of the illuminating device changes when the Z-direction position of the moving lens changes. May be good. Further, in this case, the housing includes the first housing and the second housing, and the second housing is relatively moved in the Z direction with respect to the first housing by using a screw structure. It may be adopted, and the moving lens fixed to the second housing may be relatively moved in the Z direction with respect to the fixed lens fixed to the first housing.

As described above, the lighting device 1 is fixed in the housing 10, the light source 22 that emits light in the housing 10, and the light emitting side in the Z direction (optical axis direction) with respect to the light source 22. It has a fixed lens 40 having a light emitting surface 88 located at, and a light projecting surface 87 arranged on the light emitting side in the Z direction with respect to the fixed lens 40, and the distance from the light source 22 in the Z direction is variable. It includes a moving lens 60. Further, the light incident surface 86 of the fixed lens 40 is substantially flat, while the light emitting surface 88 is convex. Further, the first projected area S2 of the normal projection of the fixed lens 40 with respect to the vertical plane P perpendicular to the Z direction is equal to or larger than the second projected area S1 of the normal projection of the light source 22 with respect to the vertical plane P.

FIG. 22 (a) is a schematic view showing the light distribution at a narrow angle in the illuminating device 1, and FIG. 22 (b) is a reference example different only in that a fixed lens does not exist as compared with the illuminating device 1. It is a schematic diagram which shows the light distribution at a narrow angle, a medium angle, and a wide angle in a lighting device. Further, FIG. 22C is a schematic diagram showing the light distribution in the lighting device 1 at a narrow angle, a medium angle, and a wide angle.

As shown in FIG. 22B, in an illuminating device in which a fixed lens does not exist, the luminosity of the central portion of the irradiation region becomes lower than that of the peripheral portion at a medium angle, and a dropout is likely to occur. On the other hand, since the illuminating device 1 of the present disclosure has a fixed lens 40 fixed in the housing 10, more of the emitted light emitted from the light source 22 can be received by the fixed lens 40, and the fixed lens The light received by the 40 can be controlled to be distributed in a direction in which the inclination angle with respect to the Z direction is small, and can be controlled so as to go downward. Therefore, excellent narrow angle control can be performed. Further, since the light received by the fixed lens 40 can be controlled to be distributed in a direction in which the tilt angle with respect to the Z direction is small, it is easy to increase the efficiency of the instrument, the light can be used efficiently, and the light emitted from the light source 22 can be used. The moving lens 60 makes it easier to control the light distribution more precisely, and as shown in FIG. 22 (c), it is possible to suppress the generation of dropouts at a medium angle. Therefore, it is easy to realize both good narrow angle characteristics and suppression of drop-in, and it is easy to emit the light from the light source 22 to the irradiation region without loss. From this, the lighting device 1 is a moving lens in which the distance between the housing 10 and the light source 22 fixed in the housing 10 and emitting light and the light source 22 in the Z direction (optical axis direction) can be changed. 60 and the narrow angle characteristic that suppresses the illuminance of the central part of the irradiation surface of the irradiation light emitted from the moving lens 60 to be lower than the illuminance of the peripheral part and reduces the area of the irradiation surface of the irradiation light. It is equipped with a narrow-angle drop improvement means that can suppress the decrease. The fixed lens 40 is included in the narrow angle drop improving means.

Further, according to the lighting device 1, the first projected area S2 is equal to or larger than the second projected area S1, and the light incident surface 86 of the fixed lens 40 is substantially flat. Therefore, not only is it easy for the light from the light source 22 to be efficiently incident on the fixed lens 40, but it is also easy for the light passing through the fixed lens 40 to be parallel light parallel to the Z direction, and it is easy to suppress the spread of the emitted light. Further, since the light emitting surface 88 of the fixed lens 40 is convex, it is easy to collect the light that has reached the light emitting surface 88, and the light projected from the light emitting surface 88 is efficiently transferred to the moving lens 60. Easy to enter. Therefore, the efficiency of the instrument can be further increased.

Further, the third projected area S21 of the normal projection of the light incident surface 86 on the vertical plane P may be smaller than the fourth projected area S22 of the normal projection of the light emitting surface 88 on the vertical plane P. Further, the second projected area S1 may be smaller than the third projected area S21.

According to this configuration, since the second projected area S1 is smaller than the third projected area S21, the light from the light source 22 can be more efficiently incident on the fixed lens 40. Further, since the third projected area S21 is smaller than the fourth projected area S22, it becomes easier to control the light from the light source 22 downward in the Z direction, and the light from the fixed lens 40 can be more efficiently transferred to the moving lens 60. It becomes easy to make an incident. Therefore, the efficiency of the instrument can be further increased. It should be noted that this configuration does not have to be adopted, and the third projected area may be equal to or larger than the fourth projected area. Further, the second projected area may also be equal to or larger than the third projected area.

Further, the fifth projected area S31 of the normal projection of the light entering surface 83 on the light source 22 side in the Z direction of the moving lens 60 with respect to the vertical plane P is from the sixth projected area S32 of the normal projection of the projecting surface 87 with respect to the vertical plane P. May be small. Further, the fourth projected area S22 may be smaller than the fifth projected area S31.

According to this configuration, since the fourth projected area S22 is smaller than the fifth projected area S31, the light emitted from the fixed lens 40 can be efficiently incident on the moving lens 60. Further, since the fifth projected area S31 is smaller than the sixth projected area S32, it becomes easy to control the irradiation light from the illuminating device 1 downward in the Z direction. Therefore, an excellent narrow-angle light distribution at a narrow-angle position can be realized. Oh, this configuration does not have to be adopted, and the fourth projected area may be equal to or larger than the fifth projected area. Further, the fifth projected area may also be equal to or larger than the sixth projected area.

Further, the distance between the light source 22 and the light incident surface 86 in the Z direction may be 1.5 mm or less.

According to this configuration, as described above, the light emitted from the light source 22 and not incident on the fixed lens 40 can be reduced, and the instrument efficiency can be further improved. Note that this configuration does not have to be adopted, and the distance between the light source and the light incident surface of the fixed lens in the Z direction may be larger than 1.5 mm.

Further, the arithmetic mean roughness of the light incident surface 86 may be smaller than the arithmetic mean roughness of the light emitting surface 88.

According to this configuration, the arithmetic average roughness of the light incident surface 86 is smaller than the arithmetic average roughness of the light emitting surface 88, so that the light incident on the light incident surface 86 can be easily controlled and the light emitting surface 88 can be easily controlled. It is easy to guide light efficiently to the side. Further, since the light emitted from the light emitting surface 88 can be easily mixed and mixed, as a result, the light emitted from the LED on the optical axis side and the light on the peripheral side can be easily mixed and mixed. Can be done. Therefore, it is possible to suppress color unevenness in each irradiation region of the irradiation light, and it is possible to emit beautiful and beautiful illumination light. Note that this configuration does not have to be adopted, and the arithmetic mean roughness of the light incident surface of the fixed lens may be equal to or greater than the arithmetic mean roughness of the light emitting surface of the fixed lens.

Further, the shore (A) hardness of the fixed lens 40 may be 50 to 90.

As described above, if the light source comes into contact with the light incident surface of the fixed lens, the light from the light source can be most efficiently incident on the fixed lens, and the instrument efficiency can be improved. However, in such a case, the fixed lens is likely to expand due to the heat from the light source, and the fixed lens and the light source may be damaged by the expansion of the fixed lens.

On the other hand, according to this configuration, the shore (A) hardness of the fixed lens 40 is 50 to 90, and the fixed lens 40 has excellent elasticity. Therefore, when the light source 22 is brought into contact with the light incident surface 86 of the fixed lens 40 to realize excellent instrument efficiency, the fixed lens 40 is elastically deformed even if the fixed lens 40 is thermally expanded. This makes it possible to suppress or prevent damage to the fixed lens 40 and the light source 22. Therefore, it is possible to simultaneously exert two effects that are in a trade-off relationship (reciprocal relationships with each other), that is, an effect that the instrument efficiency is excellent and an effect that damage to the light source 22 and the fixed lens 40 can be suppressed. It is possible to realize a remarkable effect.

In the first embodiment, the fixed lens 40 is made of a rubber elastic body made of a transparent silicone material, so that the fixed lens 40 satisfies the requirement that the shore (A) hardness is 50 to 90. Was explained. However, the requirement that the shore (A) hardness is 50 to 90 may be satisfied by the fixed lens being made of a rubber elastic body formed of a material other than the silicone material, and the fixed lens is made of a material other than the silicone material. It may be filled with the transparent elastomer of. Alternatively, this configuration may not be adopted, and the shore (A) hardness of the fixed lens may be smaller than 50 or larger than 90.

Further, the fixed lens 40 may be made of a silicone material containing silicone.

The closer the light source is to the light incident surface of the fixed lens, the higher the efficiency of the instrument and the brighter the irradiation light can be realized, while the fixed lens is more likely to be thermally deteriorated by the heat from the light source.

On the other hand, according to this configuration, the fixed lens 40 is made of a silicone material having excellent heat resistance. Therefore, it is possible to simultaneously exert two effects that are in a trade-off relationship (reciprocal relationships with each other), that is, an effect that the instrument efficiency is excellent and an effect that the thermal deterioration of the fixed lens 40 can be suppressed or prevented. It is possible to realize a remarkable effect. This configuration may not be adopted, and as described above, the fixed lens may be made of a transparent resin material such as acrylic or polycarbonate, or a glass material, or may be made of a transparent elastomer or the like. You may.

Further, the lighting device 1 may include a substrate 21 for fixing the light source 22 and a substrate holder 30 for fixing the substrate 21 to the housing 10. Further, the fixed lens 40 has a substantially circular main body 41 when viewed from the Z direction, and the main body 41 is radially opposed to each other from the edge portion of the main body 41 so as to be opposed to each other in the radial direction. It may have a pair of holding portions 53, 54 protruding in the opposite direction of the above. Then, as in this embodiment, the holding portions 53, 54 may be indirectly fixed to the substrate holder 30 via another member 45, or the holding portion may be directly fixed to the substrate holder. ..

According to this configuration, since the fixed lens 40 has a pair of holding portions 53, 54 protruding in the radial direction from the edge portions 41a, 41b of the main body 41, the fixed lens 40 is used as a substrate holder by using the holding portions 53, 54. Can be easily fixed to. Further, since the fixed lens 40 can be securely fixed to the substrate holder 30 to which the light source 22 is fixed by using the holding portions 53 and 54, it is possible to prevent the optical axis of the fixed lens 40 from being displaced with respect to the light source 22. It is easy to emit the desired irradiation light. It should be noted that this configuration does not have to be adopted. For example, the fixed lens is not fixed to the housing 10 indirectly via the substrate holder 30 by fixing the fixed lens 40 to the substrate holder 30 as in the present configuration, but the fixed lens is fixed to the housing 10. For example, it may be directly fixed to the housing by using an adhesive, a fastening member, or the like.

Further, the fixed lens 40 has a substantially circular main body 41 when viewed from the Z direction, and a pair of holding portions 53 protruding in the radial direction from the edge portion of the main body 41 so as to face the main body 41 in the radial direction. , 54 may have. Then, the transmittance of the main body 41 may be higher than the transmittance of the holding portions 53, 54.

According to this configuration, it becomes easy to control the light passing through the fixed lens 40 downward in the Z direction, and the light wrapping around from the main body 41 to the holding portions 53 and 54 can be suppressed. Therefore, the stray light emitted from the light source 22 and staying in the illuminating device 1 and being attenuated can be suppressed, and the efficiency of the fixture can be increased. Note that this configuration does not have to be adopted, and the transmittance of the main body of the fixed lens may be equal to or less than the transmittance of the holding portion of the main body. Further, as described above, the fixed lens does not have to have a holding portion, and may be composed of only a portion whose plan view when viewed from the Z direction is substantially circular. Further, in the above embodiment, the case where the transmittance of the main body 41 of the fixed lens 40 is higher than the transmittance of the moving lens 60 has been described, but the transmittance of the main body of the fixed lens may be equal to or less than the transmittance of the moving lens. Good. Further, when all of the fixed lenses are made of the same material, it is preferable that the transmittance of the fixed lens is higher than the transmittance of the moving lens, but the transmittance of the fixed lens may be equal to or less than the transmittance of the moving lens.

Further, the refractive index of the fixed lens 40 may be smaller than the refractive index of the moving lens 60.

Also in this configuration, it becomes easy to control the light passing through the fixed lens 40 downward in the Z direction, and the light wrapping around from the main body 41 to the holding portions 53 and 54 can be suppressed. Therefore, it is possible to suppress stray light emitted from the light source 22 and staying in the lighting device 1 and being attenuated, and the efficiency of the fixture can be increased. Note that this configuration does not have to be adopted, and the refractive index of the fixed lens 40 may be equal to or higher than the refractive index of the moving lens 60.

Further, the illuminating device 1 may have an inner peripheral surface 85 arranged so as to surround the moving lens 60. The inner peripheral surface 85 may include a low reflectance inner surface portion which is located on the light emitting side and has a light reflectance of 15% or less than the position where the moving lens 60 is most moved to the light source 22 side in the Z direction. ..

According to this configuration, light is less likely to be reflected on the low reflectance inner surface portion, and light can be absorbed on the low reflectance inner surface portion. Therefore, it is possible to reduce the glare when a person looks up at the lighting device 1. As described above, this configuration may not be adopted, and the lighting device may not have such a low reflectance inner surface portion.

Further, the moving lens 60 may have an annular Fresnel 69 projecting toward the light source 22 in the Z direction. Further, all of the fixed lenses 40 may be arranged in the recess 77 defined by the inner peripheral surface 69a of the annular Fresnel 69 and the end surface 76 on the light source 22 side in the Z direction of the moving lens 60.

According to this configuration, it is possible to increase the efficiency of the instrument when the moving lens 60 is present at the wide-angle position and perform wide-angle control, and it is possible to irradiate particularly bright illumination light in the wide-angle control. Further, since the moving range of the moving lens 60 in the Z direction can be increased, the degree of freedom of light distribution in the lighting device 1 can be increased, and excellent light distribution control can be realized.

Furthermore, although not described in detail in the above-described embodiment, a special effect can be obtained by adopting the following configuration.

Specifically, the moving lens 60 may have one or more Fresnel 69s on the upper side in the Z direction and the outer peripheral side in the R direction. In particular, as in the present embodiment, the moving lens 60 is on the upper side in the Z direction and on the outer peripheral side. It may have one or more Fresnel 69s.

According to this configuration, the light emitted from the light source 22 to the outside in the R direction is easily received by the Fresnel 69. Therefore, the efficiency of the instrument can be increased. It should be noted that this configuration is preferably adopted, but may not be adopted, and the moving lens may not have Fresnel on the upper side in the Z direction and on the outer peripheral side.

Further, as shown in FIG. 4, the effective lens diameter of the fixed lens 40 on the light emitting side in the Z direction (reference number 26 indicates one location on the effective lens diameter of the fixed lens 40) is the light source 22. The outer diameter, more specifically, the effective diameter of the lens on the light emitting side in the Z direction of the moving lens 60, which is larger than the diameter of the tangent circle of the annular edge on the lower side in the Z direction of the light source 22 (reference number 31 is the moving lens 60). It may be smaller than (indicating one location located on the effective diameter of the lens). Here, the effective diameter of the lens is defined as the maximum diameter of the region through which the light beam passes on the surface of the lens through which the light beam passes. Further, the effective diameter of the lens may be defined as the diameter of a bundle of parallel rays that exits from an object point on the optical axis of the lens and passes through the lens.

According to this configuration, the fixed lens 40 can efficiently receive the light emitted by the light source 22, and further, the light intensity of the fixed lens 40 is arranged at a narrow angle position by the ambient light emitted from the fixed lens 40. It becomes easy to adjust the light intensity that can be incident on the light receiving surface 83 of the moving lens 60. Further, as in the present embodiment, when the effective lens diameter of the fixed lens 40 is smaller than the inner diameter of the annular Fresnel 69 located on the innermost peripheral side, the ambient light is further arranged at a narrow angle position. It is preferable that the moving lens 60 is easily incident on the outer edge portion 83a of the light receiving surface 83. It is preferable that these configurations are adopted, but they may not be adopted.

Further, the effective diameter of the fixed lens 40 on the light emitting side in the Z direction may be 2.5 times or more the diameter of the circumscribed circle.

According to this configuration, it is possible to obtain narrow angle performance without increasing the size of a general device, for example, less than 14 ° at a 1/2 beam angle without increasing the size of a general device. It is possible to realize excellent narrow-angle performance. In the case of a device such as a universal downlight whose optical axis direction can be adjusted by swinging, it is difficult to extend the device due to the fixed diameter of the embedded hole in the ceiling and the swing angle of the device. Therefore, the effect of this configuration becomes more remarkable. It is preferable that this configuration is adopted, but it is not necessary to adopt it.

Further, the fixed lens 40 directs the ambient light of the light cone emitted from the fixed lens 40 to the outer edge portion of the light entering surface 83 in the Z direction of the moving lens 60 arranged at the narrow angle position farthest from the light source 22. It may have a degree of light collection that allows it to be incident on 83a. In other words, the fixed lens 40 makes the ambient light located in the periphery among the emitted light emitted from the fixed lens 40 the outer edge portion 83a of the incoming surface 83 of the moving lens 60 located on the light emitting side in the optical axis direction. It may have a light intensity that can be incident on the lens.

According to this configuration, the light emitted from the fixed lens 40 can be efficiently incident on the moving lens 60, and the efficiency of the instrument can be further increased. It is preferable that this configuration is adopted, but it is not necessary to adopt it.

As described above, in the first embodiment, the case where the technical idea of the present disclosure is applied to the embedded downlight has been described as an example. However, the luminaire may be suspended on rails or on the ceiling. Further, the lighting device of the present disclosure may be a spotlight. Further, when the lighting device of the present disclosure is a downlight or a spotlight, the downlight or the spotlight has a wide variety of structures, and the technology of the present disclosure has a wide variety of downlights or spotlights. Any of these structures may be the basis.

(Second Embodiment)
In the second embodiment, an example in which the technical idea of the present disclosure is applied to a spotlight will be described. It should be noted that any one or more of all the configurations described in the first embodiment can be applied to the spotlights constituting the lighting device 101 of the second embodiment.

FIG. 23 is a perspective view of the lighting device 101 according to the second embodiment of the present disclosure. The lighting device 101 is a spotlight and includes a power supply unit 105 that also serves as a mounting portion, a support portion 110, and a main body portion 115. The power supply unit 105 is attached to a wiring duct (not shown). The power supply unit 105 has a storage unit 106 and a power supply circuit (not shown) housed in the storage unit 106. AC power from an external power source such as a commercial power source is supplied to the power supply circuit through a wiring duct. The power supply circuit converts the AC power into DC power by performing rectification processing or smoothing on the supplied AC power, and supplies the converted DC power to a light source described later. Further, although not described in detail, the support portion 110 is attached to, for example, one end of the elongated housing portion 106 in the longitudinal direction and extends in a direction substantially orthogonal to the longitudinal direction. The main body 115 incorporates a light source 143 (see FIG. 27). The main body 115 is attached to the support 110 so that the optical axis direction of the emitted light emitted from the light source 143 can be changed.

FIG. 24 is an exploded perspective view of the main portion 120 of the main body portion 115. As shown in FIG. 24, the main portion 120 includes a housing 130, a fixed lens assembly 140, a moving lens assembly 160, and a hood 195. The housing 130 includes an outer cylinder 130a and an inner member 130b, and the inner member 130b is inserted into the outer cylinder 130a from one side in the axial direction of the outer cylinder 130a. Then, the inner member 130b is screwed and fixed to the inner flange portion 190 (see FIG. 25) of the outer cylinder 130a with screws 191. Further, the fixed lens assembly 140 is screwed into the housing 130, and the moving lens assembly 160 is rotatably attached to the housing 130 with respect to the housing 130. Although not described in detail, the hood 195 is a tubular member, and is locked to, for example, a moving lens assembly 160 by using a spring member (not shown). The hood 195 plays a role of limiting the irradiation area of the emitted light.

FIG. 25 is a perspective view of the housing 130 when viewed from the light emitting side. As shown in FIG. 25, the housing 130 has a tubular portion 131 that opens on the light emitting side, and includes a substrate contact portion 133 on its main surface 132 (end surface on the light emitting side). A fixed lens assembly 140 (see FIG. 24) is fixed to the main surface 132. FIG. 26 is a perspective view of the fixed lens assembly 140. As shown in FIG. 26, the fixed lens assembly 140 has the same structure as the fixed lens assembly 90 of the first embodiment, and includes a light source module, a substrate holder 145, a fixed lens 148, and a lens mounting member 150. The fixed lens 148 is included in the narrow angle drop improving means. Further, as shown in FIG. 27, that is, a perspective view showing a state in which the fixed lens 148 and the lens mounting member 150 are removed from the fixed lens assembly 140, the light source module 125 has a substrate 142 and a light source 143. The substrate 142 has a substantially rectangular shape in a plan view. Further, the light source 143 has a disk-like shape and is arranged substantially in the center of the mounting surface of the substrate 142.

The fixed lens assembly 140 has the same structure as that of the first embodiment, and is fixed to the main surface 132 of the tubular portion 131 (see FIG. 25) by using the two holder fixing members 146 and the two screws shown in FIG. 24. .. Similar to the first embodiment, the holder fixing member 146 presses a part of the peripheral edge of the surface of the substrate 142 on the light emitting side to the side opposite to the light emitting side. With the fixed lens assembly 140 fixed to the main surface 132, the surface of the substrate 142 opposite to the light emitting side comes into contact with the substrate contact portion 133 (see FIG. 25), and the heat generated by the light source 143 is generated. Can efficiently perform heat drawing.

FIG. 28 is a perspective view of the moving lens assembly 160. The moving lens assembly 160 also has the same structure as the moving lens assembly 75 of the first embodiment, includes an optical block 161 and a rotating member 165, and the optical block 161 includes a lens holder 162 and a moving lens 163.

The illuminating device 101 has a C-shaped retaining ring 194 whose perspective view is shown in FIG. 29. The C-shaped retaining ring 194 is made of a material that is easily elastically deformed, and is easily elastically deformed in the R direction. The C-shaped retaining ring 194 has a plurality of projecting portions 192 that are located at intervals in the θ direction and project outward in the R direction. On the other hand, the rotating member 165 has an annular groove (not shown) extending in the θ direction on the inner peripheral side, and as shown in FIG. 30, has a plurality of through holes 193 communicating with the annular groove and penetrating in the radial direction. Have. The plurality of through holes 193 are located at intervals in the θ direction. The C-shaped retaining ring 194 is fitted into the annular groove to fix it, and the protruding portion 192 is inserted into the through hole 193. Then, a portion 192a of the protruding portion 192 that protrudes outward in the R direction from the rotating member 165 is provided on the inner peripheral surface of the tubular portion 131 and extends in the θ direction. For example, it is housed in an annular groove). In this way, the rotating member 165 is rotatably attached to the tubular portion 131 with almost no change in the Z-direction position with respect to the tubular portion 131. When this mounting method is used, it is not necessary to form the tubular portion 131 into a divided structure. Therefore, the handleability and the ease of assembly of the lighting device 101 can be remarkably improved. The rotating member 165 may have the same structure as that of the first embodiment and may be fixed to the inner peripheral side of the tubular portion 131.

As shown in FIG. 28, in the lighting device 101 of the second embodiment (see FIG. 23), the rotating member 165 has a grip portion 164 on the lower side in the Z direction, similarly to the lighting device 1 of the first embodiment. As shown in FIG. 23, the grip portion 164 is located on the light emitting side in the Z direction with respect to the tubular portion 131 and is exposed to the outside. The lighting device 101 of the second embodiment also has the same structure as the lighting device 1 of the first embodiment, and a person uses the grip portion 164 to rotate the rotating member 165 relative to the tubular portion 131 in the circumferential direction. Therefore, the moving lens 163 moves relative to the fixed lens 148 in the Z direction.

Also in the second embodiment, the lighting device 101 is fixed in the housing 130, and the distance between the light source 143 that emits light and the light source 143 in the Z direction (optical axis direction) can be changed. A narrow angle that suppresses the illuminance of the central portion of the irradiation surface of the moving lens 163 and the irradiation light emitted from the moving lens 163 to be lower than the illuminance of the peripheral portion, and reduces the area of the irradiation surface of the irradiation light. It is provided with a means for improving narrow-angle dropout that can suppress deterioration of characteristics. The fixed lens 148 is included in the narrow angle drop improving means. Further, the lighting device 101 is fixed to the housing 130 and emits light 143, and is fixed in the housing 130 and emits light located on the light emitting side in the Z direction (optical axis direction) of the light source 143. A fixed lens 148 having a surface is provided. Further, the illumination device 101 includes a moving lens 163 having a light projecting surface arranged on the light emitting side in the Z direction with respect to the fixed lens 148 and having a variable distance in the Z direction from the light source 143. Further, the light incident surface of the fixed lens 148 is substantially flat, while the light emitting surface is convex. Further, the first projected area of the normal projection of the fixed lens 148 on the vertical plane perpendicular to the Z direction is equal to or larger than the second projected area of the normal projection of the light source 143 on the vertical plane. Therefore, it is easy to realize both good narrow-angle characteristics and suppression of drop-in, and the light from the light source 143 can be emitted to the irradiation region without loss.

Further, the illuminating device 101 can be applied to any configuration applicable to the illuminating device 1, and can exhibit all the functions and effects that the illuminating device 1 can produce. For example, the third projected area of the normal projection of the light incident surface of the fixed lens 148 with respect to the vertical plane may be smaller than the fourth projected area of the normal projection of the light emitting surface of the fixed lens 148 with respect to the vertical plane. Further, the second projected area may be smaller than the third projected area.

According to this configuration, the light from the light source 143 can be more efficiently incident on the fixed lens 148. In addition, the light from the light source 143 can be easily controlled downward in the Z direction, and the light from the fixed lens 148 can be more efficiently incident on the moving lens 163. Therefore, the efficiency of the instrument can be further increased.

Further, the fifth projected area of the normal projection of the light entering surface on the light source 143 side in the Z direction of the moving lens 163 with respect to the vertical plane is the positive of the light emitting side on the light emitting side in the Z direction of the moving lens 163 with respect to the vertical plane. It may be smaller than the sixth projected area of the projection. Further, the fourth projected area may be smaller than the fifth projected area.

According to this configuration, the light emitted from the fixed lens 148 can be efficiently incident on the moving lens 163. In addition, the irradiation light from the lighting device 101 can be easily controlled downward in the Z direction, and an excellent narrow-angle light distribution at a narrow-angle position can be realized.

Further, the distance between the light source 143 and the light incident surface of the fixed lens 148 in the Z direction may be 1.5 mm or less.

According to this configuration, the light emitted from the light source 143 and not incident on the fixed lens 148 can be reduced, and the efficiency of the instrument can be further improved.

Further, the arithmetic mean roughness of the light incident surface of the fixed lens 148 may be smaller than the arithmetic mean roughness of the light emitting surface of the fixed lens 148.

According to this configuration, it is easy to control the light incident on the light incident surface, and it is easy to efficiently guide the light to the light emitting surface side. Further, since the light emitted from the light emitting surface can be easily mixed and mixed, as a result, the light emitted from the LED on the optical axis side and the light on the peripheral side can be easily mixed and mixed. .. Therefore, it is possible to suppress color unevenness in each irradiation region of the irradiation light, and it is possible to emit beautiful and beautiful illumination light. Since high narrow angle control is performed on the spotlight, color unevenness is easily noticeable. Therefore, if this configuration is adopted, a remarkable effect can be obtained.

Further, the shore (A) hardness of the fixed lens 148 may be 50 to 90.

According to this configuration, the fixed lens 148 has excellent elasticity. Therefore, even if the light source 143 comes into contact with the light incident surface of the fixed lens 148 at the temperature of any of the fixed lenses 148 in use to achieve excellent instrument efficiency, the fixed lens 148 is elastically deformed. This makes it possible to suppress or prevent damage to the fixed lens 148 and the light source 143. Therefore, it is possible to simultaneously exert two effects that are in a trade-off relationship (reciprocal relationships with each other), that is, an effect that the instrument efficiency is excellent and an effect that damage to the light source 143 and the fixed lens 148 can be suppressed. It is possible to realize a remarkable effect.

Further, the fixed lens 148 may be made of a silicone material containing silicone.

According to this configuration, the fixed lens 148 is made of a silicone material having excellent heat resistance. Therefore, it is possible to simultaneously exert two effects that are in a trade-off relationship (reciprocal relationships with each other), that is, an effect that the instrument efficiency is excellent and an effect that the thermal deterioration of the fixed lens 148 can be suppressed or prevented. It is possible to realize a remarkable effect.

Further, the lighting device 101 may include a substrate 142 for fixing the light source 143 and a substrate holder 145 for fixing the substrate 142 to the tubular portion 131. Further, as shown in FIG. 31, that is, a perspective view of the fixed lens 148 when viewed from the light emitting side in the Z direction, the main body 141 in which the fixed lens 148 has a substantially circular plan view when viewed from the Z direction. And may have a pair of holding portions 153,154 protruding in the radial direction from the edge portion of the main body 141 so as to face the radial direction of the main body 141. Then, as in this embodiment, the holding portions 153 and 154 are indirectly fixed to the substrate holder 145 via another member 150 (see FIG. 26), or the holding portion is directly fixed to the substrate holder. It may be fixed.

According to this configuration, since the fixed lens 148 has a pair of holding portions 153,154 protruding in the radial direction from the edge portion of the main body 141, the fixed lens 148 can be easily attached to the substrate holder 145 by using the holding portions 153,154. Can be fixed to. Further, since the fixed lens 148 can be securely fixed to the substrate holder 145 to which the light source 143 is fixed by using the holding portions 153 and 154, it is possible to prevent the optical axis of the fixed lens 148 from being displaced with respect to the light source 143. The desired irradiation light can be reliably emitted.

Further, the fixed lens 148 has a substantially circular main body 141 when viewed from the Z direction, and a pair of holding portions 153 protruding in the radial direction from the edge portion of the main body 141 so as to face the main body 141 in the radial direction. , 154 may be included. Then, the transmittance of the main body 141 may be higher than the transmittance of the holding portions 153 and 154. Further, the refractive index of the fixed lens 148 may be smaller than the refractive index of the moving lens 163.

According to these configurations, it becomes easy to control the light passing through the fixed lens 148 downward in the Z direction, and the light wrapping around from the main body 141 to the holding portions 153 and 164 can be suppressed. Therefore, the stray light emitted from the light source 143 and staying in the illuminating device 101 and being attenuated can be suppressed, and the efficiency of the fixture can be increased.

Further, the illuminating device 101 may have an inner peripheral surface arranged so as to surround the moving lens 163. The inner peripheral surface thereof may include a low reflectance inner surface portion which is located on the light emitting side and has a light reflectance of 15% or less than the position where the moving lens 163 moves most toward the light source 143 in the Z direction. ..

According to this configuration, light is less likely to be reflected on the low reflectance inner surface portion, and light can be absorbed on the low reflectance inner surface portion. Therefore, it is possible to reduce the glare when a person looks up at the lighting device 101.

Further, the moving lens 163 may have an annular Fresnel 169 (FIG. 28) protruding toward the light source 143 in the Z direction. Further, all of the fixed lenses 148 may be arranged so as to be housed in a recess 177 defined by an inner peripheral surface 169a of the annular Fresnel 169 and an end surface 176 of the moving lens 163 on the light source 143 side in the Z direction.

According to this configuration, it is possible to increase the efficiency of the instrument when the moving lens 163 is present at the wide-angle position and perform wide-angle control, and it is possible to irradiate particularly bright illumination light in the wide-angle control. Further, since the moving range of the moving lens 163 in the Z direction can be increased, the degree of freedom of light distribution in the lighting device 101 can be increased, and the lighting device 101 having excellent light distribution control can be realized.

As described above, in the first embodiment, an example in which the technical idea of the present disclosure is applied to the downlight will be described, and in the second embodiment, an example in which the technical idea of the present disclosure is applied to the spotlight will be described. Was explained. However, the technical idea of the present disclosure may be applied to any lighting device other than downlights and spotlights, and may be applied to, for example, ceiling lights, line lights, floor lights, pendant lights and the like.

In short, the lighting device is a fixed lens having a housing, a light source fixed in the housing and emitting light, and a light emitting surface fixed in the housing and located on the light emitting side in the optical axis direction with respect to the light source. And a moving lens having a light projecting surface arranged on the light emitting side in the optical axis direction with respect to the fixed lens and capable of varying the distance in the optical axis direction from the light source, the light incident surface of the fixed lens. Is a substantially flat surface, while the light emitting surface is a convex surface, and the first projection area of the normal projection of the fixed lens on the vertical plane perpendicular to the optical axis direction is equal to or larger than the second projection area of the normal projection of the light source on the vertical plane. Any type of lighting device may be used as long as it has the above configuration.

In comparison with the lighting devices of all the examples and the lighting devices of the modified examples described so far, the light incident surface 234 of the fixed lens 248 is not a substantially flat surface, and the light incident surface 234 of the fixed lens 248 is , As shown in the schematic cross-sectional view shown in FIG. 32, the lighting device 201 may be created which differs only in that it has an annular Frenel 278 protruding toward the substrate 221 in the Z direction on the outer peripheral side in the radial direction.

In this case, the tip of the Fresnel 278 (upper end in the Z direction) 278a is closer to the substrate 221 in the Z direction than the position where the tip of the light source 222 is moved to the light emitting side by 1 mm in the Z direction. It is preferable to be located at. Further, the Z direction position of the tip 278a of the Fresnel 278 coincides with the Z direction position of the tip (lower end in the Z direction) 222a on the light emitting side of the light source 222, or the Z direction position of the tip 222a on the light emitting side of the light source 222. It is more preferable that the position is closer to the substrate 221 than that, in which case the tip 278a of the Fresnel 278 may come into contact with the substrate 221.

By forming such an illuminating device, the light from the light source 222 can be efficiently incident on the fixed lens 248, and in particular, the tip 222a on the light emitting side of the light source 222 is radially surrounded by the annular Fresnel 278. In this case, the light from the light source 222 can be more efficiently incident on the fixed lens 248. Therefore, it is possible to realize a lighting device having excellent fixture efficiency.

(Third Embodiment)
In the lighting device (downlight) 1 of the first embodiment, the case where the narrow-angle drop improving means includes the fixed lens 40 has been described, and the case where the lighting device 1 has the fixed lens 40 and the moving lens 60 has been described. Then, the case where the lighting device 1 has a double lens structure (double lens structure) has been described. However, the illuminator does not have to have a fixed lens. In the third embodiment, a case where the illuminating device 301 is a downlight having only a moving lens 360 without a fixed lens will be described.

FIG. 33 is a perspective view of the lighting device 301 of the third embodiment, and FIG. 34 is a perspective view of the lighting device 301 when viewed from another direction. As shown in FIG. 33, the lighting device 301 is an embedded universal downlight having an optical axis adjusting member 317 like the lighting device 1 of the first embodiment, and the Z direction (optical axis direction) is the vertical direction. It is possible to change the angle to a desired angle. Further, as shown in FIG. 34, in the lighting device 301, similarly to the lighting device 1, the housing 310 has a two-divided structure, and includes the first member 310a, the second member 310b, and the bolt 398. The housing 310 is formed by integrally fixing the first member 310a and the second member 310b with bolts 398. The structure for fixing the lighting device 301 around the hole to be embedded is the same as that of the first embodiment, and the description thereof will be omitted.

FIG. 35 is an exploded perspective view of a main part of the lighting device 301. As shown in FIG. 35, the lighting device 301 includes a first member 310a, a second member 310b, a light source module 325, a rotating member 380, a substrate holder 330, a lens holder 370, and a moving lens 360. Further, the light source module 325 includes a substrate 321 and a light source 322, and the light source 322 is fixed to a mounting surface on the light emitting side of the substrate 321. These members or parts have a structure similar to the structure of the corresponding members or parts in the lighting device 1 of the first embodiment. Further, those members or parts are made of the same material as the corresponding members or parts in the lighting device 1, for example.

Similar to the first embodiment, the light source module 325 is fixed to the main surface 311 of the housing 310 by bolts (not shown) while being held by the substrate holder 330. Further, with the same structure as that of the first embodiment, the moving lens 360 is fixed to the lens holder 370, and the fitting claw 378 as an example of the fitting portion of the lens holder 370 is provided with an inclined groove (spiral shape) of the rotating member 380. Groove) 381 is movably fitted. In this way, the moving lens assembly 375 whose perspective view is shown in FIG. 36 is configured.

Then, with the same structure as in the second embodiment, the moving lens assembly 375 is elastically deformable using a C-shaped retaining ring 394 having a protruding portion 394a (see FIG. 36) as an example of the guide locking portion. , The protrusion 394a is moved in the θ direction to the circumferential extending groove 385 (see FIG. 35) provided on the inner peripheral surface of the housing 310 in which the first and second members 310a and 310b are fixed to each other and integrated. When fitted as possible, the lighting device 301 is configured. The moving lens assembly 375 may be fixed to the housing 310 by using the structure described in the first embodiment without using the C-shaped retaining ring 394.

Next, the narrow angle drop improving means of the lighting device 301 of the third embodiment will be described. FIG. 37 is a perspective view of the moving lens 360 when viewed from the light incident side, and FIG. 38 is a perspective view of the moving lens 360 when viewed from the light emitting side. Further, FIG. 39 is a cross-sectional view of the moving lens 360 when it is cut along a plane passing through its optical axis. As shown in FIG. 37, the moving lens 360 has an annular Fresnel 369 on the upper side in the Z direction and the outer side in the R direction. In the example shown in FIG. 37, the moving lens 360 has only one annular Fresnel 369 on the upper side in the Z direction, but the moving lens 360 has a plurality of annular Fresnels having different inner diameters on the upper side in the Z direction. May have.

Further, as shown in FIG. 39, the moving lens 360 is provided with a dome-shaped portion 351 and a flange portion 352 and an annular Fresnel 353 at an end portion on the light emitting side. The dome-shaped portion 351 is located at the central portion in the R direction and has a dome shape convex downward in the Z direction. Further, the flange portion 352 is located at the outer end portion in the R direction and projects outward in the R direction. Further, the Fresnel 353 is located between the dome-shaped portion 351 and the flange portion 352 in the R direction, and projects downward in the Z direction.

Further, as shown in FIG. 39, the Fresnel 369 has a reflecting surface 334 which is an outer peripheral surface on the outer side in the R direction. The reflective surface 334 is an annular tapered surface centered on the optical axis X of the moving lens 360, and its diameter gradually increases from the upper end to the lower end. The reflecting surface 334 reflects the light spreading outward in the radial direction toward the light emitting surface 333 side to improve the light utilization efficiency. The reflection surface 334 is a so-called total reflection surface, and totally reflects light incident at an angle equal to or higher than the critical angle. The upper end of the reflecting surface 334 is located at the upper end of the moving lens 360, and the lower end of the reflecting surface 334 is connected to the flange portion 352.

The reflecting surface 334 is included in the narrow angle drop improving means. Specifically, the reflecting surface 334 includes an inwardly convex region 334a that is convex on the optical axis X side and an outwardly convex region 334b that is convex on the side opposite to the optical axis X. The inwardly convex region 334a reflects the light spreading outward in the R direction in the direction directly below the illuminating device 301, particularly when the light source 322 and the moving lens 360 are brought closer to each other to increase the light distribution angle, and the outer convex region 334b is formed. When the light source 322 and the moving lens 360 are separated from each other and the light distribution angle is set small, the reached light is efficiently reflected directly under the lighting device 301. From this, when the inward convex region 334a and the outward convex region 34b are formed on the reflection surface 334, the light reflected by the reflection surface 334 can be efficiently irradiated directly under the illuminating device 301, and the central portion of the irradiation region becomes dark. The occurrence of falling can be suppressed.

The reflecting surface 334 may include a plurality of inwardly convex regions 334a and a plurality of outwardly convex regions 334b and may be formed in a corrugated manner, but preferably includes one of each. The inward convex region 334a is preferably formed on the light emitting surface 333 side, that is, on the lower end side of the moving lens 360 with respect to the outward convex region 334b. In the present embodiment, one inward convex region 334a and one outward convex region 334b are included in the reflection surface 334, and a continuous inward convex region 334a and an outer convex region 334b are formed in the entire reflection surface 334.

The inner convex region 334a and the outer convex region 334b are preferably curved surfaces having no bent portion, and are formed in an annular shape about the optical axis X. In the present embodiment, the inward convex region 334a is gently curved toward the inside of the moving lens 360, and the outward convex region 334b is gently curved toward the outside of the moving lens 360. The inner convex region 334a and the outer convex region 334b may be curved surfaces having a constant curvature or curved surfaces having a changing curvature. In the present embodiment, the radius of curvature of the outer convex region 334b is larger than the radius of curvature of the inner convex region 334a.

In the present embodiment, the width (length in the optical axis direction) of the outer convex region 334b is wider than the width of the inner convex region 334a, and the area of the outer convex region 334b is larger than the area of the inner convex region 334a. The area ratio of the inner convex region 334a to the outer convex region 334b is preferably changed as appropriate according to the curvature of each region, and the area of the outer convex region may be smaller than the area of the inner convex region.

In the moving lens 360, the area of the inward convex region 334a is S1, the radius of curvature of the inward convex region 334a is R1, the area of the outer convex region 334b is S2, the radius of curvature of the outer convex region 334b is R2, and the maximum of the reflecting surface 334. When the diameter is φ, it is preferable to satisfy at least one of the following relationships (1) and (2), and it is particularly preferable to satisfy both relationships (1) and (2). When the conditions (1) and (2) are satisfied, the occurrence of the above-mentioned dropout can be suppressed more effectively. When the area S1 of the inward convex region 334a is small, it is preferable to reduce the radius of curvature R1 of the inward convex region 334a to increase the curvature.
(1) R2 ≧ 1.5 × φ
(2) 5 × φ × (S1 / S2) ² ≦ R1 ≦ 25 × φ × (S1 / S2) ²

Next, a dimensional relationship preferable to be adopted in the lighting device 301 will be described. FIG. 40 is a perspective view of the housing 310 when viewed from below in the Z direction, and FIG. 41 is a perspective view of the lens holder 370. The lighting device 301 has the same rotation prevention structure as the structure described in detail in the first embodiment. Specifically, as shown in FIG. 40, the housing 310 has one or more columnar portions 350 provided on the inner wall surface 391 of the light source accommodating chamber 390 accommodating the light source 322 and extending in the Z direction, preferably. , It has a plurality of columnar portions 350 as in the present embodiment.

Further, as shown in FIG. 41, the lens holder 370 has an annular portion 371 and one or more leg portions 372, and preferably has a plurality of leg portions 372 as in the present embodiment. The leg portion 372 is an example of a circumferential movement limiting portion, and extends upward from the annular portion 371 in the Z direction. The plurality of columnar portions 350 and the plurality of leg portions 372 are arranged at intervals in the θ direction. The leg portion 372 has a locking surface 377 that opens outward in the R direction and in the vertical direction in the Z direction on the outer surface on the outer side in the R direction. The locking surface 377 is an example of a locking portion. By locking the columnar portion 350 to the locking surface 377 of the leg portion 372 so as to be relatively movable in the Z direction, the lens holder 370 is prevented from rotating with respect to the housing 310 in the circumferential direction, and the housing The range of movement of the lens holder 370 in the circumferential direction with respect to 310 is limited.

FIG. 42 is a diagram illustrating a preferred magnitude relationship with respect to the dimensions of the housing 310, the moving lens 360, and the lens holder 370. As shown in FIG. 42, the height H1 in the Z direction of the Fresnel 369 having the highest height in the Z direction among one or more annular Fresnel 369s is the height in the Z direction of the one or more legs 372. Is preferably lower than the height H2 of the high leg portion 372 in the Z direction.

According to this configuration, the moving range of the moving lens 360 in the Z direction can be increased.

Further, the height of the leg portion 372 having the highest height in the Z direction among the one or more leg portions 372 is the height of the columnar portion 350 having the highest height in the Z direction among the columnar portions 350 having a H2 of 1 or more. It is preferably higher than H3.

According to this configuration, a larger region in the height direction of the leg portion 372 can be supported and supported by the columnar portion 350. Therefore, the rattling of the moving lens 260 can be suppressed.

Further, it is preferable that the housing 310 has a plurality of columnar portions 350 and the lens holder 370 has a plurality of leg portions 372.

According to this configuration, it is possible to prevent the optical axis X of the moving lens 360 from being displaced with respect to the light source 322 when the moving lens 360 is moved. Therefore, it becomes easy to emit the irradiation light in a desired direction.

Further, the illuminating device 301 has a θ of the moving lens 360 with respect to the housing 310 in a state where the height position in the Z direction does not substantially change with respect to the inner wall surface 391 defining the light source accommodating chamber 390 accommodating the light source 322 in the housing 310. A rotating member 380 that is relatively rotatable in the direction may be provided. Further, the rotating member 380 may have an inclined groove 381. Then, the lens holder 370 has a fitting claw 378 that fits into the inclined groove 381, and the moving lens 360 can continuously move in the housing 310 in the Z direction while rotating about the optical axis X. It may be.

According to this configuration, the light distribution fluctuation can be continuously performed, and it is easy to set the desired illumination light.

Further, the housing 310 may have a guide portion for guiding the rotating member 380 in the θ direction on the inner wall surface 391 (see FIG. 40), and the guide portion extends in the circumferential direction extending in the θ direction. The groove 385 may be used. Further, with reference to FIG. 36, the protruding portion 394a of the C-shaped retaining ring 394 may be locked to the circumferential extension groove 385 so as to be relatively movable in the θ direction. Further, the housing 310 may have a structure that can be divided into a plurality of members, and may include, for example, a first member 310a and a second member 310b.

According to this configuration, the rotating member 380 can be reliably prevented from falling, and the assembling property and disassembling performance of the rotating member 380 can be improved. Further, it is easy to dissipate heat from the gaps between the first and second members 310a and 310b, which are integrated with bolts 398 to form the annular housing 310, and as a result, the heat dissipation of the lighting device 301 is improved. Can be done.

Further, the surface reflectance of the housing 310 may be 15% or less.

According to this configuration, it is possible to suppress the light that is reflected by the inner peripheral surface of the housing 310 and becomes uncontrollable, and it is possible to suppress the disturbance of the light distribution of the irradiation light.

Further, the surface reflectance of the housing 310 may be 70% or more.

According to this configuration, heat can be suppressed from being trapped in the housing 310, and thermal deterioration of the housing 310 can be suppressed.

Further, with reference to FIG. 42, the light source 322 may have a disk-like shape. Further, among one or more annular Fresnel 369s, the inner diameter L1 of the end of the Fresnel 369 located on the innermost side of the moving lens 360 in the R direction opposite to the light emitting side in the Z direction is the outer diameter L2 of the light source 322. May be larger than.

According to this configuration, among the light emitted by the light source 322, the amount of light incident on the innermost side in the R direction from that of Fresnel 369 located on the innermost side can be increased, and the light not incident on the moving lens 360 can be increased. It can be reduced and the efficiency of the equipment can be increased.

(Fourth Embodiment)
In the fourth embodiment, a case where the lighting device is a spotlight and the center drop is suppressed while maintaining good narrow angle control only by the moving lens without using the fixed lens will be described. FIG. 43 is a perspective view of the lighting device 401 according to the fourth embodiment of the present disclosure. The lighting device 401 is a spotlight and includes a power supply unit 405 that also serves as a mounting portion, a support portion 408, and a main body portion 415. The power supply unit 405 is attached to a wiring duct (not shown). The power supply unit 405 has a storage unit 406 and a power supply circuit (not shown) housed in the housing unit 406. AC power from an external power source such as a commercial power source is supplied to the power supply circuit through a wiring duct. The power supply circuit converts the AC power into DC power by performing rectification processing or smoothing on the supplied AC power, and supplies the converted DC power to a light source described later. Further, the support portion 408 is attached to, for example, one end of the elongated housing portion 406 in the longitudinal direction and extends in a direction substantially orthogonal to the longitudinal direction. The main body 415 incorporates a light source 422 (see FIG. 44). The main body 415 is attached to the support 408 so that the optical axis direction of the emitted light emitted from the light source 422 can be changed.

FIG. 44 is an exploded perspective view of the main portion 420 of the main body portion 415. As shown in FIG. 44, the main portion 420 includes a housing 410, a moving lens 460, a lens holder 470, a rotating member 480, a C-shaped retaining ring 494, and a hood 495. The housing 410 has an outer cylinder member 411 and an inner member 412. The inner member 412 is arranged on the outer cylinder member 411 from the side opposite to the light emitting side in the Z direction of the outer cylinder member 411. The end face of the inner member 412 on the light emitting side in the Z direction is provided on the light emitting side of the outer cylinder member 411 in the Z direction and protrudes inward in the radial direction from the inner peripheral surface of the outer cylinder member 411. It is fixed to the upper end face of the portion 411a in the Z direction. For this fixing, a bolt 435 and a screw hole 411b provided in the inner annular flange portion 411a are used.

As shown in FIG. 44, the light source module 425 is fixed to the central portion of the end face of the inner member 412 on the light emitting side in the Z direction. As shown in FIG. 45, the moving lens 460, the lens holder 470, and the rotating member 480 are assembled in the same manner as in the third embodiment to form the moving lens assembly 475. Further, the rotating member 480 has a plurality of protrusion insertion holes 498 provided at intervals in the θ direction. The protruding portion 494a of the C-shaped retaining ring 494 is inserted into the protruding portion insertion hole 498, and the C-shaped retaining ring 494 is assembled to the moving lens assembly 475 by the insertion. The tip end side of the protruding portion 494a projects outward in the R direction from the outer peripheral surface of the rotating member 480. By accommodating the tip end side of the protruding portion 494a in the circumferential extending groove 485 (see FIG. 44) provided on the inner peripheral surface of the outer cylinder member 411 and extending in the θ direction, the housing 410 and the moving lens The assembly 475 and the C-shaped retaining ring 494 are integrated and integrated. The hood 495 is a tubular member, and is locked to, for example, a moving lens assembly 460 using a spring member (not shown). The hood 495 plays a role of limiting the irradiation area of the emitted light.

FIG. 46 is a perspective view of the moving lens 460 as viewed from above in the Z direction, and FIG. 47 shows the state in which the inner member 412 to which the light source module 425 is fixed is fixed to the outer cylinder member 411. It is a perspective view of the tubular member 411 when viewed from the lower side in the Z direction. Further, FIG. 48 is a perspective view of the lens holder 470. As shown in FIG. 46, the moving lens 460 has an annular Fresnel 469 projecting upward in the Z direction, similarly to the moving lens 360 of the third embodiment. Although not shown, the reflecting surface 434 of the moving lens 460 includes an inwardly convex region convex on the optical axis X side and a convex outward convex region on the opposite side of the optical axis X, similarly to the moving lens 360. The reflective surface 434 is included in the narrow angle drop improving means.

Further, as shown in FIG. 47, the housing 410 has one or more columnar portions 450 provided on the inner wall surface 491 of the light source accommodating chamber 490 accommodating the light source 422 and extending in the Z direction, preferably. It has a plurality of columnar portions 450 as in the present embodiment. Further, as shown in FIG. 48, the lens holder 470 has an annular portion 471 and one or more leg portions 472, and preferably has a plurality of leg portions 472 as in the present embodiment.

The leg portion 472 is an example of a circumferential movement limiting portion, and extends upward from the annular portion 471 in the Z direction. The plurality of columnar portions 450 and the plurality of leg portions 472 are arranged at intervals in the θ direction. The leg portion 472 has a locking surface 477 that opens outward in the R direction and in the vertical direction in the Z direction on the outer surface on the outer side in the R direction. By locking the columnar portion 450 to the locking surface 477 of the leg portion 472 so as to be relatively movable in the Z direction, the lens holder 470 is prevented from rotating with respect to the housing 410 in the circumferential direction.

As described above, in the illuminating device 401 as well as the illuminating device 301 of the third embodiment, the moving lens 460 is formed in an annular shape about the optical axis and includes a reflecting surface 434 included in the narrow angle drop improving means. Further, the reflecting surface 434 includes an inwardly convex region convex on the optical axis side and an outward convex region convex on the opposite side of the optical axis.

Therefore, it is easy to realize both good narrow angle characteristics and suppression of drop-in, and it is easy to emit the light from the light source 422 to the irradiation region without loss.

Further, it is preferable that the lighting device 401 also satisfies the following plurality of configurations as in the lighting device 301 of the third embodiment.

Specifically, the moving lens 460 may have one or more annular Fresnel 469s projecting on the side opposite to the light emitting side in the Z direction. Further, the lighting device 401 holds the moving lens 460 and is arranged outside the moving lens 460 in the R direction and contacts the housing 410 to limit the moving range of the moving lens 460 in the circumferential direction1. A lens holder 470 including the above leg portion (circumferential movement limiting portion) 472 may be provided. Further, the height of Fresnel 469, which has the highest height in the Z direction among one or more annular Fresnel 469s, is the Z direction of the leg portion 472, which has the highest height in the Z direction among one or more legs 472. It may be lower than the height of.

According to this configuration, the moving range of the moving lens 460 in the Z direction can be increased. The height of Fresnel 469, which has the highest height in the Z direction among one or more annular Fresnel 469s, is the Z direction of the leg portion 472, which has the lowest height in the Z direction among one or more legs 472. It may be lower than the height of.

Further, the housing 410 may have one or more columnar portions 450 extending in the substantially Z direction on the inner wall surface 491 defining the light source accommodating chamber 490 accommodating the light source 422. Further, the lens holder 470 has an annular portion 471, and the circumferential movement limiting portion projects from the annular portion 471 to the side opposite to the light emitting side in the Z direction, and the locking surface 477 that locks the columnar portion 450 ( A leg portion 472 having a locking portion) may be used. The height of the leg 472 having the highest height in the Z direction among the one or more legs 472 is higher than the height of the column 450 having the highest height in the Z direction among the columnar portions 450 having one or more. It may be expensive.

According to this configuration, a larger region in the height direction of the columnar portion 450 can be supported and supported by the leg portion 472. Therefore, the rattling of the moving lens 460 can be suppressed.

Further, the housing 410 may have a plurality of columnar portions 450, and the lens holder 470 may have a plurality of leg portions 472.

According to this configuration, it is possible to prevent the optical axis of the moving lens 460 from being displaced with respect to the light source when the moving lens 460 is moved. Therefore, it becomes easy to emit the irradiation light in a desired direction.

Further, the lighting device 401 has a θ of the moving lens 460 with respect to the housing 410 in a state where the height position in the Z direction does not substantially change on the inner wall surface 491 defining the light source storage chamber 490 that houses the light source 422 in the housing 410. A rotating member 480 that is relatively rotatable in the direction may be provided. Further, the rotating member 480 may have an inclined groove (spiral groove) 481 (see FIG. 45). Then, the lens holder 470 has a fitting claw (engagement portion) 478 that fits into the inclined groove 481, and the moving lens 460 continuously rotates in the housing 410 in the Z direction while rotating about the optical axis. It may be movable.

According to this configuration, the light distribution fluctuation can be continuously performed, and it is easy to set the desired illumination light.

Further, the surface reflectance of the housing 410 may be 15% or less.

According to this configuration, it is possible to suppress the light that is reflected by the inner peripheral surface of the housing 410 and becomes uncontrollable, and it is possible to suppress the disturbance of the light distribution of the irradiation light.

Further, the surface reflectance of the housing 410 may be 70% or more.

According to this configuration, heat can be suppressed from being trapped in the housing 410, and thermal deterioration of the housing 410 can be suppressed.

Further, the following configuration may be adopted to increase the efficiency of the instrument. FIG. 49 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a perspective view when the moving lens 460 and the light source module 425 are viewed from diagonally below the moving lens 460. Further, FIG. 50 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a plan view when the moving lens 460 and the light source module 425 are viewed from above in the Z direction. As shown in FIG. 49, the light source 422 of the light source module 425 may have a disk shape. Further, as shown in FIGS. 49 and 50, when viewed from the Z direction, all of the light source module 425 overlaps the region surrounded by the annular Fresnel 469 of the moving lens 460, and the central axis of the light source 422 is Fresnel 469. May substantially coincide with the central axis of. That is, the inner diameter of the end of one or more annular Fresnel 469s located on the innermost side of the moving lens 460 in the R direction opposite to the light emitting side in the Z direction is larger than the outer diameter of the light source 422. It may be large.

According to this configuration, among the light emitted by the light source 422, the amount of light incident on the innermost side of the Fresnel 469 in the R direction can be increased, and the light not incident on the moving lens 460 can be increased. It can be reduced and the efficiency of the equipment can be increased.

(Other embodiments)
In the first and second embodiments, and modified examples thereof, a case where good narrow angle control and suppression of dropout are realized by mounting fixed lenses 40,148 in addition to the moving lenses 60 and 163 will be described. did. Further, in the third and fourth embodiments and their modified examples, good narrow angle control and suppression of center drop are achieved by making the shapes of the moving lenses 360 and 460 special instead of mounting the fixed lens. The case of realizing the above was explained. Further, in the third and fourth embodiments, FIG. 42 defines a preferable magnitude relationship between the member dimensions shown by H1 to H3 and the member dimensions shown by L1 and L2. However, in the lighting device having the moving lenses 360, 460 described in the third and fourth embodiments, the magnitude relation of the member dimensions may not be established.

Further, as a reminder, the magnitude relationship established between the member dimensions described in the third and fourth embodiments is the lighting device described in the first embodiment and the lighting described in the second embodiment. It may or may not be established in the device or the lighting device of the modified examples of the first and second embodiments. Further, in the lighting device having the moving lenses 360,460 described in the third and fourth embodiments, the surface reflectance of the housing does not have to be 15% or less, or the surface reflectance of the housing is 70%. It does not have to be the above. Further, even if the lighting devices of the first and second embodiments and their modified examples have a configuration in which the surface reflectance of the housing is 15% or less as described in the third and fourth embodiments. Well, it doesn't have to be. Alternatively, the lighting devices of the first and second embodiments and their modified examples may have a configuration in which the surface reflectance of the housing is 70% or more as described in the third and fourth embodiments. Well, it doesn't have to be.

Further, in the lighting device having a fixed lens and a moving lens, the moving lens may be a moving lens having an inward convex region and an outer convex region described in the third and fourth embodiments, and the inner convex region and the outer convex region may be formed. A moving lens that does not have both may be used. Further, any configuration adopted in the downlights of the lighting devices 1,301 of the first embodiment and the third embodiment is adopted in the spotlights of the lighting devices 101,401 of the second embodiment and the fourth embodiment. You may. On the contrary, any configuration adopted in the spotlights of the lighting devices 101 and 401 of the second embodiment and the fourth embodiment is the downlight of the lighting devices 1,301 of the first embodiment and the third embodiment. May be adopted for.

Further, in the lighting device of the present disclosure, the output of the light emitting unit (for example, a light emitting element (for example, LED)) may be any output. However, unlike the lighting devices 301 and 401, by providing the inward convex region 334a and the outward convex region 334b on the reflecting surface 334 of the moving lens 360 without having a fixed lens, it is possible to suppress the dropout and perform good narrow angle control. The configuration to be executed is preferably mounted on a high output product in which the output of the light emitting unit (for example, LED) is larger than 15 W (watt). Further, in a configuration such as the lighting devices 1, 101, which is provided with a fixed lens and a moving lens to suppress dropout and perform good narrow angle control, the output of the light emitting unit (for example, LED) is 15 W (watt). It is preferable that it is mounted on a smaller output product.

(Lighting equipment that produces beneficial effects)
In the third and fourth embodiments, the plurality of magnitude relations described with respect to the member dimensions shown by H1 to H3 in FIG. 42 and the member dimensions shown by L1 and L2 can increase the moving range of the moving lens and the moving lens. It was preferable that it was established in order to prevent rattling and increase the efficiency of equipment. Therefore, in comparison with the illuminating devices of the third embodiment, the fourth embodiment, and their modified examples, only the point that the moving lens is changed to a moving lens having neither the inward convex region nor the outward convex region. Even if different lighting devices are manufactured, it is possible to increase the moving range of the moving lens, prevent rattling of the moving lens, and increase the efficiency of the fixture. Therefore, in comparison with the illuminating devices of the third embodiment, the fourth embodiment, and their modified examples, the moving lens is changed to a moving lens having neither an inward convex region nor an outward convex region. Lighting devices that differ only in themselves (eg, downlights, spotlights, etc.) can produce the beneficial effects described in the third and fourth embodiments. As a reminder, it goes without saying that such a lighting device does not have a fixed lens.

1,101,301,401 Illumination device, 10,130,310,410 housing, 21,142,321 board, 22,143,322,422 light source, 30,145,330 board holder, 40,148 fixed lens, 41,141 Fixed lens body, 53,54,153,154 holding part, 60,163,360,460 moving lens, 69,169,369,469 moving lens Fresnel, 69a, 169a Fresnel inner peripheral surface, 76 , 176 End face of moving lens, 77,177 Concave part of moving lens, 83 Incoming light surface, 85 Inner peripheral surface, 86 Light incident surface, 87 Light source surface, 88 Light emitting surface, 310a First member of housing, 310b housing Second member of the body, reflective surface of 334,434 moving lens, 334a inward convex region, 334b outward convex region, 350,450 columnar part, 370,470 lens holder, 371,471 annular part, 372,472 legs, 377 , 477 Locking surface, 378,478 Engagement claw, 380,480 Rotating member, 381,481 Inclined groove, 385 Circumferential extension groove, 390,490 Light source accommodation chamber, 391,491 Inner wall surface of light source accommodation chamber, 394 , 494 C-type retaining ring, 394a, 494a projecting part, 405 power supply part, 406 accommodating part, 408 support part, 415 main body part, H1 highest Frenel height, H2 highest leg height, H3 highest columnar Height of the part, P vertical plane, inner diameter of the upper end of L1 Fresnel, outer diameter of L2 disc-shaped light source, S1 second projected area, S2 first projected area, S21 third projected area, S22 fourth projected area, S31 5th projected area, S32 6th projected area, X-axis Optical axis of the moving lens.

Claims (22)

With the housing
A light source fixed in the housing and emitting light,
A moving lens whose distance from the light source in the optical axis direction is variable,
The illuminance of the central portion of the irradiation surface of the irradiation light emitted from the moving lens is suppressed to be lower than the illuminance of the peripheral portion, and the narrow angle characteristic of reducing the region of the irradiation surface of the irradiation light is reduced. As a means of improving narrow-angle dropouts that can also suppress
A lighting device. With the housing
A light source fixed in the housing and emitting light,
A fixed lens that is fixed in the housing, has a light emitting surface located on the light emitting side in the optical axis direction of the light source, and is included in the narrow angle drop improving means.
A moving lens having a light projecting surface arranged on the light emitting side in the optical axis direction with respect to the fixed lens and having a variable distance from the light source in the optical axis direction is provided.
The light incident surface of the fixed lens is substantially flat, while the light emitting surface is convex.
An illuminating device in which the first projected area of the normal projection of the fixed lens on a vertical plane perpendicular to the optical axis direction is equal to or larger than the second projected area of the normal projection of the light source on the vertical plane. The third projected area of the normal projection of the light incident surface with respect to the vertical plane is smaller than the fourth projected area of the normal projection of the light emitting surface with respect to the vertical plane, and the second projected area is the third projected area. The lighting device according to claim 2, which is smaller than. The fifth projection area of the normal projection of the light receiving surface on the light source side in the optical axis direction of the moving lens with respect to the vertical plane is smaller than the sixth projection area of the normal projection of the projection surface on the vertical plane.
The lighting device according to claim 3, wherein the fourth projected area is smaller than the fifth projected area. The lighting device according to any one of claims 2 to 4, wherein the distance between the light source and the light incident surface in the optical axis direction is 1.5 mm or less. The lighting device according to any one of claims 2 to 5, wherein the arithmetic mean roughness of the light incident surface is smaller than the arithmetic average roughness of the light emitting surface. The illuminating device according to any one of claims 2 to 6, wherein the fixed lens has a shore (A) hardness of 50 to 90. The lighting device according to any one of claims 2 to 7, wherein the fixed lens is made of a silicone material containing silicone. A substrate for fixing the light source and
A substrate holder for fixing the substrate to the housing is provided.
The fixed lens has a main body having a substantially circular plan view when viewed from the optical axis direction, and a pair of holding portions protruding in the radial direction from the edge of the main body so as to face the radial direction of the main body. Have and
The lighting device according to any one of claims 2 to 8, wherein the holding portion is directly fixed to the board holder or indirectly fixed to the board holder via another member. The fixed lens has a main body having a substantially circular plan view when viewed from the optical axis direction, and a pair of holding portions protruding in the radial direction from the edge of the main body so as to face the radial direction of the main body. Have and
The lighting device according to any one of claims 2 to 9, wherein the transmittance of the main body is higher than the transmittance of the holding portion. The illuminating device according to any one of claims 2 to 10, wherein the refractive index of the fixed lens is smaller than the refractive index of the moving lens. It has an inner peripheral surface that is arranged so as to surround the moving lens.
The inner peripheral surface includes a low reflectance inner surface portion in which the moving lens is located closer to the light emitting side than the position where the moving lens is most moved to the light source side in the optical axis direction and the light reflectance is 15% or less. Item 2. The lighting device according to any one of Items 2 to 11. The moving lens has an annular Fresnel projecting toward the light source in the optical axis direction.
2. To the present invention, all of the fixed lenses can be arranged in a recess defined by an inner peripheral surface of the annular Fresnel and an end surface of the moving lens on the light source side in the optical axis direction. The lighting device according to any one of 12. The moving lens is formed in an annular shape about the optical axis and has a reflecting surface included in the narrow angle drop improving means.
The lighting device according to any one of claims 1 to 13, wherein the reflecting surface includes an inwardly convex region convex on the optical axis side and an outward convex region convex on the opposite side of the optical axis. The moving lens has one or more annular Fresnels projecting on the side opposite to the light emitting side in the optical axis direction.
One or more circumferential movement limiting portions that hold the moving lens and are arranged outside the moving lens in the radial direction to limit the circumferential movement range of the moving lens by contacting the housing. Equipped with a lens holder, including
The height of the frennel having the highest height in the optical axis direction among the one or more annular frenels is the highest in the optical axis direction among the one or more circumferential movement limiting portions. The lighting device according to any one of claims 1 to 14, which is lower than the height of the circumferential movement limiting portion in the optical axis direction. The housing has one or more columnar portions extending substantially in the optical axis direction on an inner wall surface defining a light source accommodating chamber for accommodating the light source.
The lens holder has an annular portion and has an annular portion.
The circumferential movement limiting portion is a leg portion including a locking portion that projects from the annular portion to the side opposite to the light emitting side in the optical axis direction and locks the columnar portion.
The height of the leg portion having the highest height in the optical axis direction among the one or more legs has the height of the columnar portion having the highest height in the optical axis direction among the one or more columnar portions. The lighting device according to claim 15, which is higher than that. The housing has a plurality of the columnar portions.
The lighting device according to claim 16, wherein the lens holder has a plurality of the legs. In the housing, the height position in the optical axis direction of the inner wall surface defining the light source accommodating chamber for accommodating the light source is substantially unchanged, and the moving lens can rotate relative to the housing in the circumferential direction. And, with a rotating member having a spiral groove,
The lens holder has a fitting portion that fits in the annular groove, and the moving lens can continuously move in the housing in the optical axis direction while rotating about the optical axis. The lighting device according to any one of claims 15 to 17. The housing has a guide portion on the inner wall surface that guides the rotating member so as to be movable in the circumferential direction.
The guide portion is provided with a guide locking portion that locks the guide portion so as to be relatively movable in the circumferential direction.
The lighting device according to claim 18, wherein the housing has a structure that can be divided into a plurality of members. The lighting device according to any one of claims 1 to 19, wherein the surface reflectance of the housing is 15% or less. The lighting device according to any one of claims 1 to 19, wherein the surface reflectance of the housing is 70% or more. The moving lens has one or more annular Fresnels projecting on the side opposite to the light emitting side in the optical axis direction.
The light source has a disk-like shape and has a disk-like shape.
Among the one or more annular Fresnels, the inner diameter of the end of the Fresnel located on the innermost side in the radial direction of the moving lens opposite to the light emitting side in the optical axis direction is larger than the outer diameter of the light source. The large lighting device according to any one of claims 1 to 21.

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