JP2015138761A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device suppressed in unevenness of brightness.SOLUTION: The lighting device includes: a light source 20 including a solid light emitting element; and an optical element 10 outputting light incident from the light source 20. The optical element 10 includes: an incident surface 101 to which the light from the light source 20 is incident; and an output surface 102 which outputs the light incident from the incident surface 101. The incident surface 101 is provided with an annular projection part 11 having an incident part 111 into which the light from the light source 20 is directly incident, and a reflection part 112 reflecting the light incident to the incident part 111. The projection part 11 is formed into a first shape in a planar view. A plurality of light dispersion parts 13 dispersing the light are arranged in a prescribed arrangement pattern on at least part of the output surface 102, and therefore, the first shape is different from a shape in the prescribed arrangement pattern.

Description

  The present invention relates to an illumination device including an optical member.

  Lighting devices with various light distribution variations such as LED spotlights and LED universal downlights have been proposed. When these lighting devices are used, for example, in a store, a food supermarket, a living space, etc., it is possible to produce a light effect (space effect) suitable for the application.

  In LED spotlights, LED universal downlights, and the like, an optical lens is often installed and used on the irradiation direction side of a light source in order to control light distribution variations. There are various types of optical lenses, and by installing an optical lens selected according to a desired application, it is possible to control light distribution from a wide range of diffusion and narrow angle to wide angle. Thereby, for example, various effects of light can be performed according to the application, such as irradiating an irradiation object in a spot manner.

  Conventionally, in order to make the optical lens thin and small, it has been proposed to employ a Fresnel lens as the optical lens (for example, Patent Document 1).

JP 2007-134316 A

  However, the conventional lighting device has a problem that uneven brightness occurs.

  Therefore, the present invention has been made in view of the above-described circumstances, and an object thereof is to provide an illumination device in which luminance unevenness is suppressed.

  In order to achieve the above object, one aspect of an illumination device according to the present invention includes a light source including a solid light-emitting element, and an optical member that emits light incident from the light source, and the optical member includes A light incident surface on which light from a light source is incident; and an output surface from which light incident from the light incident surface is emitted. The light incident surface includes an incident portion on which light from the light source is directly incident; and the light incident portion. An annular protrusion having a reflecting portion that reflects light incident on the protrusion, the protrusion having a first shape in plan view, and at least a part of the emission surface has a plurality of light diffusing portions. The light diffusion portions are arranged in a predetermined arrangement pattern, and the first shape is different from the shape of the predetermined arrangement pattern.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: The said light-diffusion part is good also as a structure arrange | positioned so that there may be no clearance gap between the said adjacent light-diffusion parts.

  Moreover, the one aspect | mode of the illuminating device which concerns on this invention WHEREIN: The said light-diffusion part is good also as a structure which has a spherical shape.

  Moreover, the aspect of the illumination device according to the present invention may be configured such that the shape of the predetermined arrangement pattern is a spiral shape centered on the optical axis of the optical member.

  ADVANTAGE OF THE INVENTION According to this invention, the illuminating device by which the brightness nonuniformity was suppressed can be provided.

FIG. 1 is an exploded perspective view of a lighting device according to an embodiment. FIG. 2 is a cross-sectional view of the illumination device according to the embodiment. FIG. 3 is a cross-sectional view of the optical member according to the embodiment. FIG. 4 is a diagram illustrating an emission surface of the optical member according to the embodiment. FIG. 5 is an enlarged view showing the vicinity of the center of the emission surface of the optical member according to the embodiment. FIG. 6 is a partially enlarged cross-sectional view of the optical member according to the embodiment. FIG. 7 is a diagram illustrating an emission surface on which a light diffusion portion of the optical member is formed. FIG. 8 is an enlarged view showing the vicinity of the center of the emission surface where the light diffusion portion of the optical member is formed. FIG. 9 is a partially enlarged cross-sectional view of an optical member having a light diffusion portion formed on the exit surface. FIG. 10 is a schematic view of an optical path of light from a light source incident on the optical member.

(Knowledge that is the basis of the present invention)
Prior to the description of the embodiment of the present invention, the knowledge that forms the basis of the present invention will be described. Here, a technique for suppressing luminance unevenness in an illumination device that uses an integrated LED module as a light source and uses a Fresnel lens having a plurality of annular protrusions as an optical member will be described.

  In an illuminating device that uses an integrated LED module as a light source, luminance unevenness corresponding to a matrix-like arrangement pattern of integrated LED chips may occur in outgoing light that is light-distributed and controlled by a Fresnel lens. Hereinafter, a technique for forming a large number of minute light diffusion portions (uneven portions) on the emission surface of the optical member in order to suppress the luminance unevenness will be described.

  FIG. 7 is a view showing an emission surface on which the light diffusion portion of the optical member 90 is formed. Here, the emission surface is a surface on the side where light incident on the optical member 90 from the light source is emitted, and the incidence surface is a surface on the side where light from the light source is directly incident on the optical member 90. is there. The mesh-like solid line shown in FIG. 7 shows the outline of each light diffusion part. A center point C2 shown in FIG. 7 indicates a point through which the optical axis passes on the exit surface. Further, in FIG. 7, in addition to the outline of the light diffusing portion, a part of the ridge line of the annular protrusion formed on the incident surface of the optical member 90 is indicated by a dotted line. As shown in FIG. 7, the protrusions are formed concentrically around the center point C2.

  FIG. 8 is an enlarged view showing the vicinity of the center point C2 of the emission surface of the optical member 90 shown in FIG. As shown in FIG. 8, the light diffusing portions on the exit surface of the optical member 90 are arranged in a substantially concentric arrangement pattern centered on the center point C2. That is, the light diffusing portions are arranged so that adjacent light diffusing portions are arranged along a concentric circle with the center point C2 as the center.

  FIG. 9 is an enlarged view showing a part of a cross section passing through the optical axis of the optical member 90. As shown in FIG. 9, the light diffusing portion 93 formed on the exit surface of the optical member 90 is formed in a convex spherical shape having the same radius of curvature. In addition, on the incident surface of the optical member 90, an annular protrusion 91 having an incident portion 911 where light from the light source directly enters and a reflection portion 912 that reflects light incident on the incident portion 911 is formed. ing.

  By using the optical member 90 as shown in FIGS. 7, 8, and 9, luminance unevenness corresponding to the arrangement of the LED chips in the light source is suppressed.

  However, it has been found that when the optical member 90 is used, annular luminance unevenness occurs on the outer periphery of the emitted light. The luminance unevenness will be described with reference to FIG.

  FIG. 10 is a schematic view of an optical path of light from a light source incident on the optical member 90. As shown in FIG. 10, a plurality of annular protrusions 91 are formed on the incident surface of the optical member 90. The protrusion 91 includes an incident part 911 where light from the light source is directly incident and a reflection part 912 that reflects light incident on the incident part 911. Most of the light that directly enters the protrusion 91 of the optical member 90 from the light source propagates along the optical paths P1, P2, P3, and P4 shown in FIG. That is, the light incident on the protrusion 91 (see P1) is incident on the incident portion 911 of the protrusion 91, refracted and propagated in the protrusion 91 (see P2), and then reflected by the reflecting portion 912. The light travels in the angle direction in which light distribution is controlled (FIG. 10 shows a narrow angle), enters the exit surface (see P3), and exits from the exit surface (see P4). However, part of the light incident on the protrusion 91 propagates along optical paths such as the optical paths P5, P6 and P7 and the optical paths P8, P9 and P10 shown in FIG. That is, a part of the light (see P5 and P8) incident on the incident portion 911 of the protrusion 91 propagates to the exit surface without being reflected by the reflecting portion 912 (see P6 and P9), and is appropriately applied by the optical member 90. The light is emitted without being subjected to light distribution control (see P7 and P10).

  Since the light emitted without being appropriately controlled by the optical member 90 is generated at each protrusion 91 formed concentrically on the incident surface of the optical member 90, a concentric circle is formed on the outer periphery of the emitted light. Brightness unevenness occurs. It should be noted that this luminance unevenness is not sufficiently suppressed by the light diffusion portion 93 formed on the exit surface of the optical member 90. That is, since the light diffusing portion 93 is arranged in a concentric arrangement pattern similar to the shape of the projection 91 in plan view, the diameter of the light on the same circumference centered at the center point C2 by the light diffusing portion 93. The direction of refraction in the direction does not differ greatly at each position on the same circumference. The light on the same circumference is refracted and diffused in various directions by the light diffusing unit 93 in the circumferential direction, but even if concentric light diffuses in the circumferential direction, The change in luminance distribution is small. Accordingly, the concentric light (P7 and P10 in FIG. 10) that causes the above-described luminance unevenness maintains the substantially concentric luminance distribution even though it passes through the light diffusion portion 93 arranged concentrically. The light exits from the exit surface of the optical member 90. That is, the light diffusion portion 93 does not sufficiently suppress the luminance unevenness on the outer periphery of the emitted light. This luminance unevenness appears as an annular illuminance unevenness on a light irradiation surface such as a wall surface or a floor surface when the lighting device is used.

  Note that, as means for suppressing luminance unevenness, for example, means for applying an embossing process to the exit surface of the optical member 90 to diffuse the emitted light can be considered. However, if the surface of the light emitting surface of the optical member 90 is subjected to a textured process that can sufficiently suppress uneven brightness, the light reflection component in the textured part increases and the degree of diffusion also increases. Therefore, there arises a problem that the luminous intensity in the vicinity of the center of the emitted light is significantly reduced.

  This invention is made | formed based on the said knowledge, and aims at suppressing the brightness nonuniformity of an illuminating device. Further, a means for suppressing a decrease in luminous intensity in the vicinity of the center of the emitted light of the illumination device in the embodiment of the present invention will be described.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that each of the embodiments described below shows a preferred specific example of the present invention. Accordingly, the numerical values, shapes, materials, components, arrangement positions and connection forms of components, steps (steps), order of steps, and the like shown in the following embodiments are merely examples and are intended to limit the present invention. is not. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment)
First, a lighting device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is an exploded perspective view of a lighting device according to an embodiment.

  FIG. 2 is a cross-sectional view of the lighting device shown in FIG.

  The illuminating device 1 shown by FIG.1 and FIG.2 is used for lighting fixtures, such as a spotlight and the downlight which irradiates light below, for example.

  As shown in FIG. 1 and FIG. 2, the lighting device 1 includes an optical member 10, a light source 20, a reflecting plate 30, an instrument main body 40, and a frame body 50. As illustrated in FIG. 1, the illumination device 1 is configured by stacking an instrument body 40, a light source 20, a reflector 30, an optical member 10, and a frame body 50 in this order.

  Hereinafter, each component in the illuminating device 1 is demonstrated in detail.

[Light source 20]
First, the light source 20 will be described.

  The light source 20 is a light emitting module having a light emitting element, for example, and is an LED light source that emits predetermined light radially. The light source 20 is configured to emit white light, for example. The light source 20 includes a base 20b, a plurality of LEDs 20a that are bare chips (LED chips) mounted on the base 20b, and a sealing member that seals the LEDs 20a and includes a phosphor. In the present embodiment, the sealing member collectively seals all the LEDs 20a, but the configuration of the sealing member is not limited to this. It is good also as a structure which forms a sealing member in the shape of a plurality of lines along the arrangement direction of LED20a arranged in the shape of a line.

  Moreover, in the illuminating device 1 shown by FIG. 2, the optical axis of the light source 20 is a perpendicular direction (downward in a figure).

  The base 20b is a mounting substrate for mounting the plurality of LEDs 20a, and is, for example, a ceramic substrate, a resin substrate, an insulating-coated metal base substrate, or the like. The base 20b is, for example, a plate having a plane that is rectangular in plan view, and the bottom surface (upper side in FIG. 2) of the base 20b is attached to the instrument body 40 and fixed. Although not shown, the base 20b is formed with a pair of electrode terminals (a positive electrode terminal and a negative electrode terminal) for receiving DC power from outside for causing the LED 20a (light source 20) to emit light.

[Reflector 30]
Next, the reflector 30 will be described. The reflecting plate 30 has a reflecting function and has an incident port that is an opening through which light from the light source 20 enters and an emitting port that is an opening through which light incident from the incident port exits from the reflecting plate 30. The reflecting plate 30 has an annular frame shape (funnel shape) configured so that the inner diameter gradually increases from the entrance to the exit, and is made of, for example, a hard white resin material such as polybutylene terephthalate (PBT). Can be formed.

  The inner peripheral surface of the reflecting plate 30 is a reflecting surface that reflects light from the light source 20, and is configured to reflect the light incident from the incident port and emit the light from the output port.

  The reflector 30 may be formed of a metal material such as aluminum. Moreover, the reflecting plate 30 may be formed of a resin, and a metal vapor deposition film (metal reflecting film) made of a metal material such as silver or aluminum may be formed on the inner surface of the reflecting plate 30 as a reflecting surface.

[Equipment body 40]
Next, the instrument body 40 will be described. The instrument body 40 supports the light source 20 inside.

  In the present embodiment, the instrument body 40 is a mounting base to which the light source 20 is attached. The instrument body 40 also functions as a heat sink that dissipates heat generated by the light source 20. The instrument main body 40 is formed in a substantially cylindrical shape using a metal material, and is formed, for example, through an aluminum die casting process.

  Specifically, the instrument main body 40 has an attachment portion for attaching the light source 20. That is, the instrument main body 40 fixes the light source 20 by attaching the light source 20 to an attachment part. In addition, the structure which fixes the light source 20 to the instrument main body 40 is not restricted to the structure which fixes the light source 20 to the instrument main body 40 directly. For example, it is good also as a structure which fixes the light source 20 to the attachment part of the instrument main body 40 via a heat radiating member (heat sink).

  As shown in FIG. 1, a plurality of heat radiating fins protruding downward are provided at the lower part of the instrument body 40 (lower part in FIG. 1). Thereby, the heat generated by the light source 20 can be efficiently radiated.

[Frame 50]
Next, the frame 50 will be described. The frame 50 is, for example, a lamp, and is fixed to the optical member 10 and the reflection plate 30 by the instrument main body 40 and the frame 50 by being attached to the instrument main body 40.

  A flange projecting outward in the radial direction is integrally formed on the upper end portion (upper end portion in FIG. 2) of the frame body 50 in the circumferential direction. In addition, an entrance for receiving light from the light source 20 that has passed through the optical member 10 is provided on the upper portion of the frame 50. In addition, at the lower part of the frame body 50, there is provided an emission port for emitting light incident on the frame body 50 to the outside. These entrance and exit are opened in a circular shape.

  The frame 50 is formed in a substantially cylindrical shape using a metal material, like the instrument body 40, and is formed, for example, through an aluminum die casting process.

[Optical member 10]
Next, the optical member 10 will be described. The optical member 10 is disposed at a position facing the light source 20 fixed to the instrument body 40 and emits light incident from the light source 20.

  The optical member 10 according to the present embodiment is fixed to the inner bottom surface of the frame 50, and the light exiting surface (see FIG. 2) that receives the light of the light source 20 incident from the incident surface (upper side surface in FIG. 2 is emitted from the lower side).

  The optical member 10 is formed using a translucent material, and can be formed using a transparent resin material such as PMMA (acrylic) or polycarbonate, or a transparent material such as a glass material.

  Here, the optical member 10 will be described in detail with reference to FIGS.

  FIG. 3 is a cross-sectional view of an example of the optical member according to the embodiment.

  FIG. 4 is a diagram illustrating an emission surface of an example of the optical member according to the embodiment.

  FIG. 5 is an enlarged view of the vicinity of the center of the emission surface of an example of the optical member according to the embodiment.

  FIG. 6 is an enlarged view of a part of a cross section of an example of the optical member according to the embodiment.

  As shown in FIG. 3, the optical member 10 includes an incident surface 101 on which light from the light source 20 is incident and an output surface 102 that emits light incident from the incident surface 101. In addition, the incident surface 101 includes a plurality of annular protrusions 11 and a central portion 12.

  Each protrusion 11 has an annular shape, and as shown in FIG. 6, an incident part 111 into which light from the light source 20 directly enters and a light incident on the incident part 111 is reflected to reflect light. And a reflecting portion 112 that emits light.

  As shown in FIG. 6, the emission surface 102 of the optical member 10 includes a plurality of light diffusion portions 13 that diffuse light. The light diffusion portions 13 provided on the emission surface 102 are arranged in an arrangement pattern as shown in FIGS. A mesh-like solid line shown in FIGS. 4 and 5 indicates the outline of each light diffusion portion 13. In the present embodiment, the light diffusion portion 13 has a spherical shape. Moreover, the center point C1 shown in FIG.4 and FIG.5 shows the point through which an optical axis passes on an output surface. Further, in FIG. 4, in addition to the outline of the light diffusing portion 13, a part of the ridge line of the protrusion 11 formed on the incident surface 101 of the optical member 10 is indicated by a dotted line. As shown in FIG. 4, the plurality of protrusions 11 are formed concentrically around the center point C1.

  As shown in FIG. 5, the light diffusing unit 13 is arranged substantially concentrically in the vicinity of the center point C1, but the light diffusing unit 13 has the center point C1 in the other region of the emission surface 102. It is arranged in a substantially spiral shape (spiral shape) as the center.

[Action]
Here, the operation of the optical member 10 of the lighting apparatus 1 according to the present embodiment will be mainly described. As described above with reference to FIG. 10, even when the optical member 10 according to the present embodiment is used, the light exit from the light source 20 without entering the reflecting portion 112 of the annular protrusion 11. An annular light reaching 102 can be generated.

  As described above, when the light diffusion portion is arranged along the circumferential direction of the annular light, luminance unevenness caused by the annular light cannot be suppressed. That is, when the shape in plan view of the annular protrusion formed on the incident surface of the optical member made of a Fresnel lens matches the shape of the arrangement pattern of the light diffusion portion formed on the emission surface of the optical member The annular luminance unevenness on the outer periphery of the emitted light cannot be suppressed. Therefore, in the present embodiment, a configuration is adopted in which the shape of the projection 11 of the optical member 10 in plan view and the shape of the arrangement pattern of the light diffusion portion 13 are not matched. Thereby, the brightness nonuniformity in the outer periphery of emitted light can be suppressed.

  Hereinafter, the relationship between the shape of the protrusion 11 in plan view and the shape of the arrangement pattern of the light diffusion portion 13 in the present embodiment will be described in detail.

  As shown in FIG. 4, each protrusion 11 of the optical member 10 according to the present embodiment has an annular shape in plan view. Therefore, the light that is incident from the incident portion 111 of the protrusion 11 and reaches the emission surface 102 without being reflected by the reflecting portion 112 also has an annular shape. On the other hand, the arrangement pattern of the light diffusion portions 13 is a spiral shape as shown in FIGS. 4 and 5.

  Therefore, in the present embodiment, the arrangement direction of the adjacent light diffusion portions 13 does not coincide with the circumferential direction of the annular light. Thereby, the direction of refraction in the radial direction by the light diffusion portion 13 of the annular light greatly varies depending on the position in the circumferential direction of the light. Therefore, since the said annular | circular shaped light is spread | diffused in the wide range of radial direction, the brightness nonuniformity in the outer periphery of the emitted light of the illuminating device 1 is suppressed.

  In the present embodiment, a spiral shape is adopted as the shape of the arrangement pattern of the light diffusing unit 13, but the shape of the arrangement pattern is not limited to this. Arbitrary predetermined regularity such that the radial direction of the annular light causing the uneven brightness of the lighting device 1 and the arrangement direction of the adjacent light diffusion portions 13 on the optical path of the annular light do not coincide with each other. The shape of the arrangement pattern can be adopted. In addition, the shape of the projection 11 in plan view may be changed to a shape other than a circle so that the shape of the projection 11 in plan view and the shape of the arrangement pattern of the light diffusion portion 13 do not match.

  In the present embodiment, the light diffusing unit 13 near the center point C1 of the optical member 10 has little influence on the luminance unevenness caused by the annular light. Therefore, the light diffusing unit 13 near the center point C1 is They are arranged in a concentric arrangement pattern. However, the light diffusion part 13 near the center point C1 may also be arranged in a spiral arrangement pattern.

  Moreover, in this Embodiment, the light-diffusion part 13 is arrange | positioned so that there may be no clearance gap between the adjacent light-diffusion parts 13, as FIG.4 and FIG.5 shows. By arranging in this way, it is possible to suppress the occurrence of luminance unevenness corresponding to the shape of the arrangement pattern of the light diffusion portion 13.

  In addition, the size and the radius of curvature of each light diffusion portion 13 can be optimized so as to suppress luminance unevenness without significantly reducing the luminous intensity of the emitted light.

  In the present embodiment, the light diffusing portion 13 has a convex spherical shape, but the shape of the light diffusing portion 13 is not limited to this, and may be a concave spherical shape.

[Effects, etc.]
As described above, the illumination device 1 according to the present embodiment includes the light source 20 including the integrated LEDs 20a and the optical member 10 that emits the light incident from the light source 20. The optical member 10 includes an incident surface 101 on which light from the light source 20 is incident and an output surface 102 that emits light incident from the incident surface 101. Further, the incident surface 101 includes an annular protrusion 11 having an incident part 111 into which light from the light source 20 is directly incident and a reflection part 112 that reflects light incident on the incident part 111. Furthermore, a plurality of light diffusing portions 13 that diffuse light are arranged in a predetermined arrangement pattern on at least a part of the emission surface 102, and the shape of the predetermined arrangement pattern is different from the shape of the projection 11 in plan view. .

  With this configuration, in the illumination device 1 according to the present embodiment, an annular shape that is incident from the incident portion 111 of the protrusion 11 included in the optical member 10 and reaches the emission surface 102 without being reflected by the reflecting portion 112. Light can be diffused by the light diffusion unit 13. Therefore, in the illumination device 1 according to the present embodiment, it is possible to suppress luminance unevenness on the outer periphery of the emitted light.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the light-diffusion part 13 is further arrange | positioned so that a clearance gap may not be made between the adjacent light-diffusion parts 13. FIG.

  With this configuration, in the illumination device 1 according to the present embodiment, it is possible to suppress luminance unevenness corresponding to the shape of the arrangement pattern of the light diffusion unit 13.

  In lighting device 1 according to the present embodiment, light diffusing unit 13 further has a spherical shape.

  With this configuration, luminance unevenness can be suppressed without significantly reducing the central luminous intensity of the emitted light of the lighting device 1. Further, according to this configuration, it is easier to control the degree of light diffusion as compared with the case where light diffusion is performed using texture processing or the like. Further, when the shape of the light diffusing portion 13 is molded by a mold, the spherical light diffusing portion 13 can be molded more easily and with better reproducibility than the light diffusing portion having a textured shape.

(Variations, etc.)
As mentioned above, although the illuminating device which concerns on this invention was demonstrated based on embodiment, this invention is not limited to these embodiment.

  For example, in the above embodiment, a COB (Chip On Board) type light emitting module in which a plurality of LEDs 20a that are bare chips are directly mounted on the base 20b is used as the light source 20, but other solid light emitting elements may be used. Good. For example, an SMD type light emitting module in which a surface mount device (SMD: Surface Mount Device) type LED is mounted on the base 20b may be used as the light source. Moreover, you may use other solid light emitting elements, such as an organic EL element.

  Moreover, in the said embodiment, although the spiral shape was employ | adopted as the shape of the arrangement pattern of the light-diffusion part 13, the shape of the arrangement pattern different from the shape in the planar view of the projection part 11 is not restricted to this. For example, if the shape of the projection 11 in a plan view is concentric, a rectangular shape or the like can be adopted as the shape of the arrangement pattern of the light diffusion portion 13. Further, in order to suppress luminance unevenness corresponding to the arrangement pattern of the LEDs 20 a in the light source 20, a shape different from the arrangement pattern of the LEDs 20 a may be adopted as the arrangement pattern of the light diffusion unit 13.

  Moreover, in the said embodiment, although LED20a which is several bare chips was used in the light source 20, you may use a single LED chip. In this configuration, for example, when there is uneven brightness in the light distribution pattern of a single LED chip, uneven brightness in the light emitted from the optical member 10 can be suppressed.

  Moreover, in the said embodiment, although the structure which makes the curvature radius of all the light-diffusion parts 13 the same was employ | adopted, you may change a curvature radius for every light-diffusion part 13. FIG.

  Moreover, in the said embodiment, although the spherical light-diffusion part 13 was employ | adopted, the shape of the light-diffusion part 13 is not restricted to this. For example, a faceted shape combined with a minute plane can be adopted.

  Moreover, in the said embodiment, although the reflecting plate 30 was used, the reflecting plate 30 does not need to be used.

  In addition, a form obtained by making various modifications conceivable by those skilled in the art with respect to the embodiment, or realized by arbitrarily combining the components and functions in the embodiment or the modification without departing from the gist of the present invention. Forms to be made are also included in the present invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10, 90 Optical member 11, 91 Protrusion part 12 Center part 13, 93 Light-diffusion part 20 Light source 20a LED
20b Base 30 Reflector 40 Instrument body 50 Frame 101 Entrance surface 102 Exit surface 111, 911 Incident portion 112, 912 Reflector C1, C2 Center point

Claims (4)

A light source including a solid state light emitting device;
An optical member that emits light incident from the light source, and
The optical member includes an incident surface on which light from the light source is incident, and an output surface from which light incident from the incident surface is emitted,
The incident surface includes an annular protrusion having an incident portion on which light from the light source is directly incident and a reflecting portion that reflects light incident on the incident portion,
The protrusion has a first shape in plan view,
A plurality of light diffusion portions for diffusing light are arranged in a predetermined arrangement pattern on at least a part of the emission surface,
The first shape is different from the shape of the predetermined arrangement pattern. The illuminating device according to claim 1, wherein the light diffusing unit is disposed so that there is no gap between the adjacent light diffusing units. The lighting device according to claim 1, wherein the light diffusion portion has a spherical shape. The illuminating device according to any one of claims 1 to 3, wherein the shape of the predetermined arrangement pattern is a spiral shape centering on an optical axis of the optical member.

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