JP7126126B2 - Lenses, lighting devices and lighting fixtures - Google Patents

Description

The present disclosure relates to lenses, lighting devices and lighting fixtures. More particularly, the present disclosure relates to a lens that controls light distribution of a solid-state light source, a lighting device that includes the solid-state light source and the lens, and a lighting fixture that includes the lighting device and a fixture body that supports the lighting device.

As a conventional example, the lens and lighting fixture described in Patent Document 1 are exemplified. The lighting fixture described in Patent Document 1 contains a light-emitting device having a lens, a battery, a lighting device that causes the light-emitting device to emit light (lights) with power discharged from the battery in an emergency, a light-emitting device, a battery, and a lighting device. , and a cylindrical instrument body. A light source included in the light emitting device is a light emitting diode (solid light source). The lighting device described in Patent Document 1 is an emergency lighting device (emergency light) that provides emergency lighting.

The lens has a bottom surface, an exit surface, and a concave entrance surface. The output surface is a convex curved surface having a vertex above the center of the bottom surface. The incident concave surface is formed by recessing the center of the bottom surface. The incident concave surface has a bell shape with a smooth curved surface. The diameter of the incident concave surface becomes smaller toward the deeper side of the incident concave surface, and becomes larger toward the opening end side of the incident concave surface. A lens is placed over the light source such that the incident concave surface faces the light emitting surface. The lens has, on the bottom of the incident concave surface, a first convex surface that rises smaller than the depth of the incident concave surface. The first convex surface is a convex curved surface that bulges outward.

A light emitting device having a lens configured as described above can realize a so-called bat wing type light distribution.

JP 2016-162512 A

By the way, batwing type light distribution alone may not be sufficient depending on the location where the lighting equipment is installed. For example, when lighting fixtures are installed on the walls of corridors in the common areas of an apartment building, the light distribution of the lighting fixtures is limited to the longitudinal direction of the corridor (the direction in which people pass: one direction). In addition, it is necessary to distribute the light in the width direction of the corridor (direction intersecting with the one direction).

An object of the present disclosure is to provide a lens, a lighting device, and a lighting fixture capable of distributing light in one direction and improving light distribution characteristics in a direction crossing the one direction.

A lens according to an aspect of the present disclosure is a lens that controls light distribution of a solid-state light source. A lens according to an aspect of the present disclosure is made of a translucent material, has one end surface in the direction along the optical axis of the solid-state light source as a reference surface, and the other end surface in the direction along the optical axis of the solid-state light source. a lens body having an exit surface at the end face of the lens. The lens body includes a first recess recessed in a direction from the reference plane, which is a plane perpendicular to the optical axis, toward the exit surface ; It has a second recess that communicates with the first recess. The lens body is provided on the surface of the first concave portion and is included in a first incident surface on which light emitted from the solid -state light source is incident, and the first incident surface along the optical axis. and a first exit surface facing the . The lens body includes a second incident surface provided on the surface of the second concave portion, on which the light is incident, and a second incident surface included in the exit surface and facing the second incident surface along the optical axis. and an exit surface. A first distance from the first incidence surface to the first exit surface and a second distance from the second incidence surface to the second exit surface on a first imaginary plane parallel to the reference plane are becomes longer as the distance between the virtual plane of and the reference plane is shorter. In the cross-sectional shape of the lens body taken along a second imaginary plane that is parallel to the optical axis and intersects the alignment direction of the first recess and the second recess, the outline of the second incident surface have the same shape regardless of the distance between the second virtual plane along the alignment direction and the optical axis.

A lighting device according to an aspect of the present disclosure includes the solid-state light source arranged such that the light-emitting region faces the first incident surface and the second incident surface of the lens.

A lighting fixture according to an aspect of the present disclosure includes the lighting device and a fixture body that supports the lighting device.

The lens, the lighting device, and the lighting fixture of the present disclosure have the effect of distributing light in one direction and improving light distribution characteristics in a direction intersecting the one direction.

1 is a perspective view of a lighting fixture according to an embodiment of the present disclosure; FIG. FIG. 2A is a front half cross-sectional view of the same lighting fixture. FIG. 2B is a right side view of the same lighting fixture. FIG. 2C is a bottom view of the same lighting fixture. FIG. 3 is a perspective view of a lighting device (emergency light source unit) according to an embodiment of the present disclosure; FIG. 4 is an exploded perspective view of the emergency light source unit same as the above. FIG. 5A is a front view (bottom view) of the same lens. FIG. 5B is a plan view (side view) of the same lens. FIG. 5C is a rear view (top view) of the same lens. FIG. 6 is a cross-sectional view of a main part of the emergency light source unit of the same. FIG. 7 is a cross-sectional view of a lens and solid-state light source (LED module) according to an embodiment of the present disclosure; FIG. 8 is a longitudinal sectional view of the same lens and fixed light source. FIG. 9A is a front view of the same lens seen from the reference plane N1 (upper surface). 9B is a cross-sectional view taken along line X1-X2 in FIG. 9A. FIG. 9C is a cross-sectional view taken along line Y1-Y2 in FIG. 9A. FIG. 9D is a cross-sectional view taken along line Z1-Z2 in FIG. 9A. FIG. 9E is a cross-sectional view taken along line W1-W2 in FIG. 9A. FIG. 10 is a front view of the same lens and solid-state light source. FIG. 11A is a front view of the same lens. FIG. 11B is a rear view of the same lens. FIG. 12 is a cross-sectional view of the same lens. FIG. 13A is a light distribution characteristic diagram of the same lens and the same emergency light source unit. 13B is a light distribution characteristic diagram of a modified example of the lens according to the embodiment; FIG. FIG. 14 is a vertical cross-sectional view of the lens of Modification 1 of the same. FIG. 15 is a vertical cross-sectional view of the lens of Modification 2 of the same.

Hereinafter, the lens 3, lighting device (emergency light source unit 14), and lighting fixture 1 according to the embodiment will be described in detail with reference to the drawings. However, each drawing described in the following embodiments is a schematic drawing, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications can be made according to design and the like as long as the effects of the present disclosure can be achieved.

The lighting fixture 1 according to the embodiment is an emergency lighting fixture that serves both as an emergency light and a stairway guide light. The luminaire 1 is directly attached to, for example, the walls of corridors and stairs in common areas of an apartment complex. The lighting fixture 1 performs regular lighting with regular power supplied from a regular power supply (commercial power system, etc.). In addition, the lighting fixture 1 charges a storage battery with regular power, and performs emergency lighting with emergency power supplied from the storage battery when the regular power supply fails. In the following description of the lighting fixture 1, the front-rear, up-down and left-right directions indicated by arrows in FIG. For example, the forward direction of the lighting device 1 is the direction away from the wall surface to which the lighting device 1 is directly attached along the vertical direction (normal direction of the wall surface).

The lighting fixture 1 includes a fixture body 10, a reflector 11, a cover 12, a normal light source unit 13, and an emergency light source unit 14, as shown in FIGS. 1 and 2A to 2C.

The instrument body 10 is formed in a box shape with an open front surface by, for example, aluminum die casting. Inside the fixture main body 10, a regular light source unit 13, a regular lighting circuit, a charging circuit, a storage battery, an emergency lighting circuit, and the like are accommodated. The regular lighting circuit converts AC power supplied from a commercial power system into DC power, and lights the regular light source unit 13 with the converted DC power. The regular light source unit 13 has a white lighting LED (Light Emitting Diode) and a diffusion plate 130 that protects the white lighting LED and diffuses the illumination light emitted from the white lighting LED.

The reflector 11 is made of a metal material such as aluminum or an aluminum alloy and is formed in a flat plate shape (see FIG. 1). The reflector 11 is attached to the instrument body 10 so as to cover the front surface of the instrument body 10 . A circular hole 110 is opened in the center of the reflector 11 (see FIGS. 1 and 2A). When the reflector 11 is attached to the fixture main body 10 , the diffusion plate 130 of the regular light source unit 13 is exposed through the hole 110 of the reflector 11 . The front surface of the reflector 11 is mirror-finished, and the light emitted from the common light source unit 13 is reflected on the front surface of the reflector 11 .

The cover 12 is formed in a square gutter shape from synthetic resin having translucency such as acrylic resin. The cover 12 has a square front panel 120 , a rectangular left panel 121 , and a rectangular right panel 122 . The left side plate 121 protrudes rearward from the left end of the front plate 120 . The right side plate 122 protrudes rearward from the right end of the front plate 120 . The front plate 120, the left side plate 121 and the right side plate 122 are integrally formed as a molding of synthetic resin. L-shaped insertion pieces 123 are integrally formed at the rear ends of the left side plate 121 and the right side plate 122 so as to protrude rearward (see FIG. 1). Each of the insertion pieces 123 is inserted one by one into the insertion grooves 100 respectively provided at the left and right ends of the front end portion of the instrument body 10 from above the instrument body 10 (see FIG. 1). That is, the cover 12 is detachably attached to the instrument body 10 by inserting each of the pair of insertion pieces 123 into the pair of insertion grooves 100 of the instrument body 10 .

The emergency light source unit 14 is the lighting device according to the embodiment. The emergency light source unit 14 has the LED module 2 which is a solid-state light source, the lens 3 according to the embodiment, the radiator plate 15, the LED holder 16, the lens holder 17, and two mounting screws 18 (Fig. 3 and FIG. 4). The emergency light source unit 14 is accommodated in the fixture body 10 with a part of the lens 3 protruding outside the fixture body 10 through a circular window hole 101 provided in the bottom surface of the fixture body 10 (Fig. 2A-2C).

The LED module 2 has a synthetic resin package 20, as shown in FIG. A cylindrical rib 200 protrudes from the surface of package 20 . A substrate on which a plurality of LED chips are mounted is accommodated in the package 20 . These LED chips are sealed with translucent synthetic resin such as silicone resin. Light emitted from the plurality of LED chips is emitted outside the package 20 from light emitting regions 21 formed inside the ribs 200 of the package 20 . On the surface of the package 20, an anode electrode 22 and a cathode electrode 23 are provided on both ends on a diagonal line sandwiching the rib 200 (see FIG. 4). Electric wires for power supply are soldered to the anode electrode 22 and the cathode electrode 23 one by one.

The radiator plate 15 is formed in a polygonal shape (for example, an octagonal shape) by a plate material made of aluminum or an aluminum alloy, for example (see FIG. 4).

The LED holder 16 has a disk-shaped holder main body 160 and a pair of fixing portions 161 for fixing the holder main body 160 to the lens holder 17 (see FIGS. 3 and 4). The holder main body 160 and the pair of fixing portions 161 are integrally formed as a synthetic resin molding. A mounting hole 162 is opened in the center of the holder body 160 (see FIG. 4). The LED module 2 is fitted into the mounting hole 162 of the holder body 160 . The LED module 2 is held by the LED holder 16 (holder body 160 ) by being fitted into the mounting hole 162 . Also, three protrusions 164 are provided around the attachment hole 162 on the surface of the holder body 160 (see FIG. 4). Each protrusion 164 is formed in a hemispherical shape.

The pair of fixing portions 161 protrude one by one from positions opposed to each other across the mounting hole 162 on the side surface of the holder body 160 (see FIG. 4). A tip portion of each fixing portion 161 is bent in an L shape. Furthermore, a claw 163 is formed at the tip of each fixing portion 161 (see FIGS. 3 and 4).

The lens 3, as shown in FIGS. 5A to 5C, includes a lens body 30 and a flange 35 made of a translucent material such as glass (eg quartz glass). The flange 35 is formed in an annular shape. The flange 35 protrudes outward from one end (upper end) of the side surface of the lens body 30 .

The lens holder 17 has an annular frame 170 (see FIGS. 3 and 4). A circular window 171 is opened in the center of the frame 170 . The diameter of window 171 is larger than the diameter of lens body 30 and smaller than the diameter of flange 35 . In addition, in the frame 170, screw insertion holes 172 are penetrated one by one at positions opposite to each other with the window 171 interposed therebetween (see FIG. 4). Further, on the side surfaces of the frame 170, hooking portions 173 for hooking the claws 163 of the fixing portion 161 are provided one by one at positions facing each other across the window 171 (see FIG. 4).

The LED holder 16 holding the LED module 2 is coupled with the lens holder 17 by hooking the claws 163 of the pair of fixing portions 161 to the pair of hooking portions 173 of the frame 170 (see FIG. 3). The lens 3 is sandwiched between the LED holder 16 and the lens holder 17 so that the lens body 30 is inserted through the window 171 of the frame 170 . The lens 3 is held by the lens holder 17 by covering the flange 35 of the lens 3 with the peripheral portion of the window 171 in the frame 170 (see FIGS. 3 and 6).

The lens body 30 has a first recess 31A recessed inward (downward) from the reference surface N1 (upper surface) of the lens body 30, and a first recess 31A recessed inward from the reference surface N1 of the lens body 30. It has the connected 2nd recessed part 31B (refer FIG. 5B and FIG. 5C). Further, the reference surface N1 of the lens body 30 is provided with an inwardly (downwardly) recessed recess 34 surrounding the first recessed portion 31A and the second recessed portion 31B.

The first concave portion 31A is located at one end (front end) in a first direction (front-rear direction) D1 parallel to the reference surface N1 of the lens body 30 (see FIGS. 5A to 5C). The second recess 31B is located on the other end side (rear) of the first recess 31A in the first direction D1 (see FIGS. 5A to 5C).

The lens body 30 has a first incident surface 321 provided on the surface of the first concave portion 31A and on which light emitted from the LED module 2 is incident (see FIGS. 5C, 8 and 10). Further, the lens body 30 has a second incident surface 322 provided on the surface of the second concave portion 31B and on which the light emitted from the LED module 2 is incident (see FIGS. 7 to 10). Further, the lens body 30 has a first exit surface 331 and a second exit surface 332 from which light incident from the first entrance surface 321 and the second entrance surface 322 exits (see FIGS. 5A and 5B).

The second entrance surface 322 has a convex curved surface 324 protruding toward the second recess 31B and a concave curved surface 325 protruding toward the second exit surface 332 (see FIG. 12). Furthermore, the convex curved surface 324 is arranged on the side closer to the reference plane N1 than the concave curved surface 325 .

The first exit surface 331 is provided on the surface of the lens body 30 (the bottom surface of the lens body 30) located opposite to the reference surface N1 (the top surface of the lens body 30; see FIGS. 5B and 5C). The first emission surface 331 faces the first incidence surface 321 in parallel with the optical axis A1 of the LED module 2 (see FIG. 8). The second exit surface 332 is provided on the surface of the lens body 30 and faces the second entrance surface 322 in parallel with the optical axis A1 (see FIGS. 7 and 8). A third incident surface 323 is provided at the other end (rear end) in the first direction D1 on the surface of the second concave portion 31B (see FIG. 5C). The third incident surface 323 is formed in a planar shape. A third exit surface 333 is formed at the rear end of the surface of the lens body 30 . The third exit surface 333 is formed in a shape that is approximately a part of a conical surface, and faces the third entrance surface 323 .

Furthermore, at least a part of the first incident surface 321 and the second incident surface 322 overlaps the light emitting region 21 of the LED module 2 when viewed from the direction (vertical direction) along the optical axis A1 of the LED module 2 (Fig. 7, Figures 8 and 10). Note that the optical axis A1 of the LED module 2 passes through the center of the light emitting region 21 and is parallel to the normal direction of the light emitting region 21 .

Here, a first virtual plane VS1 parallel to the reference plane N1 is assumed with respect to the lens body 30 (see FIG. 8). However, it is assumed that the first virtual plane VS1 is separated from the reference plane N1 by an arbitrary distance. In the first virtual plane VS1, the distance from the first incident surface 321 to the first exit surface 331 (hereinafter referred to as the first distance L1) is the short distance between the first virtual plane VS1 and the reference surface N1. is longer (see FIG. 8). That is, the one end (front end) of the lens body 30 including the first concave portion 31A is shaped such that the thickness (first distance L1) parallel to the reference plane N1 increases as the lens body 30 approaches the reference plane N1. Also, on the first virtual plane VS1, the distance from the second entrance surface 322 to the second exit surface 332 (hereinafter referred to as the second distance L2) is the distance between the first virtual plane VS1 and the reference surface N1. is longer as is (see FIG. 7). That is, the other end portion (rear end portion) of the lens body 30 including the second concave portion 31B is also formed in such a shape that the thickness (second distance L2) parallel to the reference plane N1 increases as it approaches the reference plane N1. there is

In addition, a second virtual plane VS2 is assumed to be parallel to the optical axis A1 with respect to the lens body 30 and intersect the alignment direction (first direction D1) of the first concave portion 31A and the second concave portion 31B (see FIG. 9A). FIG. 9B shows a cross-sectional view of the lens 3 when the second virtual plane VS2 overlaps the optical axis A1. 9C to 9E show cross-sectional views of each lens 3 when the distance between the second virtual plane VS2 and the optical axis A1 is increased stepwise.

As shown in the cross-sectional views of FIGS. 9B to 9E, in the cross-sectional shape of the lens body 30 taken along the second imaginary plane VS2, the contour of the second incident surface 322 is the first plane along the first direction D1. 2 has the same shape regardless of the distance between the virtual plane VS2 and the optical axis A1. However, the “same shape” here means not only cases where the size and shape of the outline of the second incident surface 322 in each cross-sectional shape are the same (congruent), but also cases where the shape is the same but the size is different (similar). case is also included. Furthermore, the "same shape" includes cases of being enlarged or reduced in the vertical or horizontal direction.

Here, the boundary line between the first exit surface 331 and the second exit surface 332 (see dashed-dotted lines in FIGS. 5A and 5B) is assumed to be S1. A boundary line between the first incident surface 321 and the pair of second incident surfaces 322 (see the two-dotted dashed line in FIG. 5C) is S2. The two boundary lines S1 and S2 overlap in the vertical direction of the lens body 30 . Further, the intersection of the boundary line S1 and the perpendicular bisector S3 (see the broken line in FIG. 5A) of the boundary line S1 is the first center O1, and the perpendicular bisector S4 of the boundary line S2 (see the broken line in FIG. 5C) and The intersection of the boundary lines S2 is set as the second center O2. The lens 3 is arranged below the LED module 2 so that the optical axis A1 of the LED module 2 passes through the first center O1 and the second center O2 (see FIGS. 7 and 8). Note that the first incident surface 321 and the second incident surface 322 are symmetrical with respect to a plane including the boundary line S1 and the optical axis A1. Also, the first exit surface 331 and the second exit surface 332 are symmetrical with respect to a plane including the boundary line S2 and the optical axis A1.

The light distribution characteristic of the emergency light source unit 14 is shown in FIG. 13A. A solid line α1 in FIG. 13A indicates the light distribution characteristic in the horizontal direction, that is, the light distribution characteristic on a plane including the perpendicular bisector S3 of the boundary line S1 and the perpendicular bisector S4 of the boundary line S2. However, the value of the radius vector in FIG. 13A is normalized by the peak value of the light amount of the light distribution characteristic indicated by the solid line α1. As is clear from the solid line α1 in FIG. 13A, the emergency light source unit 14 emits more light in the left and right direction because the amount of light in the left and right directions is almost double the amount of light directly below. ing. A dashed line α2 in FIG. 13A indicates the light distribution characteristics in the front-rear direction, that is, the light distribution characteristics on a plane including the boundary lines S1 and S2. However, with respect to the dashed line α2, the vertically downward angle that overlaps with the optical axis A1 of the LED module 2 is 0°, the forward angle is negative, and the rearward angle is positive. As is clear from the dashed line α2 in FIG. 13A, the emergency light source unit 14 has an amount of light in the front that is approximately 1.5 times the amount of light in the rear (wall side) and directly below, and more light in the forward direction. irradiating light.

As is clear from FIG. 13A , the light entering from the first entrance surface 321 and the second entrance surface 322 and exiting from the first exit surface 331 and the second exit surface 332 is higher than when not passing through the lens 3 . Move toward the direction. Moreover, the contour of the second incident surface 322 in the cross-sectional shape of the second virtual plane VS2 has the same shape regardless of the distance between the second virtual plane VS2 along the first direction D1 and the optical axis A1. , the uniformity of light distribution characteristics along the first direction D1 can be achieved. As a result, by using the lens 3 according to the embodiment, the emergency light source unit 14 distributes light in one direction (horizontal direction) and has light distribution characteristics in a direction (forward direction) intersecting the one direction. can be improved. In addition, since the first emission surface 331 and the second emission surface 332 of the lens 3 are formed in a convex curved surface shape projecting away from the first concave portion 31A and the second concave portion 31B, the light emitted from the lens 3 is also formed. Light travels upward.

In addition, in the lens 3, at least a part of the first incident surface 321 and the second incident surface 322 overlaps the light emitting region 21 of the LED module 2 when viewed from the direction (vertical direction) along the optical axis A1 of the LED module 2. (see FIGS. 7, 8 and 10). This allows the light emitted from the LED module 2 to be efficiently incident on the first incident surface 321 and the second incident surface 322 .

Furthermore, the lens 3 has a third incident surface 323 located at the other end (rear end) in the first direction D1 on the surface of the second concave portion 31B (see FIGS. 5B and 11B). The third incident surface 323 is formed in a planar shape. A part of the light emitted from the LED module 2 and propagating backward is reflected forward by the third incident surface 323, so that the amount of light incident on the first incident surface 321 can be increased.

By the way, the relative positional relationship between the lens 3 and the solid-state light source (LED module 2) is important in order for the illumination device (emergency light source unit 14) according to the embodiment to achieve the desired light distribution characteristics. That is, the lens 3 needs to be positioned with respect to the LED module 2 . Therefore, the lens 3 according to the embodiment has a plurality of (eg, three) positioning recesses 36 around the recess 34 on the reference surface N1 of the lens body 30 (see FIG. 5C). Each of these three positioning recesses 36 consists of a hemispherical recess connected to recess 34 . The three positioning recesses 36 are arranged at equal intervals along the circumferential direction of the recesses 34 on the reference plane N1 (see FIG. 5C).

In the lens 3, each of the three projections 164 of the LED holder 16 is fitted into each of the three positioning recesses 36 of the lens body 30 (see FIG. 6). That is, the lens 3 is positioned on the holder main body 160 of the LED holder 16 by the three positioning recesses 36 and the three projections 164 . Furthermore, the lens 3 is positioned with the LED module 2 via the LED holder 16 . The lens holder 17 is screwed to the radiator plate 15 by mounting screws 18 that are inserted through the pair of screw insertion holes 172, respectively (see FIG. 3).

Therefore, since the lens 3 according to the embodiment is positioned with respect to the LED module 2 by the positioning portion (positioning concave portion 36) provided on the reference surface N1 of the lens body 30, variations in light distribution characteristics can be reduced. .

Modification 1 of the lens 3 according to the embodiment will now be described. As shown in FIG. 14, the lens 3 of Modification 1 differs from the lens 3 according to the embodiment only in that the recess 34 is not provided on the upper surface of the lens body 30 . In addition, in the lens 3 according to the embodiment, the recess 34 is provided in the lens body 30 as a space for letting out electric wires electrically connected to the anode electrode 22 and the cathode electrode 23 of the LED module 2 .

FIG. 13B shows the light distribution characteristics of the emergency light source unit 14 having the lens 3 of Modification 1. As shown in FIG. A solid line β1 in FIG. 13B indicates the light distribution characteristic in the horizontal direction. However, the value of the radius vector in FIG. 13B is normalized by the peak value of the light amount of the light distribution characteristic indicated by the solid line β1. As is clear from the solid line β1 in FIG. 13B , the emergency light source unit 14 including the lens 3 of Modification 1 has a As a result, the amounts of light in the left and right directions are almost doubled. However, in the light distribution characteristic indicated by the solid line β1 in FIG. 13B, the amount of light around ±40° is reduced by about 30% with respect to the light distribution characteristic indicated by the solid line α1 in FIG. 13A. That is, since the lens 3 of the modified example is not provided with the concave portion 34, it is possible to reduce the peak of the amount of light near ±40° in the left-right direction.

A dashed line β2 in FIG. 13B indicates the light distribution characteristics in the front-rear direction. As is clear from the dashed line β2 in FIG. 13B , the emergency light source unit 14 including the lens 3 of Modification 1 has the same amount of light as the emergency light source unit 14 including the lens 3 according to the embodiment. , the amount of light in front is approximately 1.5 times. However, in the light distribution characteristic indicated by the dashed line β2 in FIG. 13B, the amount of light around −40° is reduced by about 30% compared to the light distribution characteristic indicated by the dashed line α2 in FIG. 13A. In other words, since the lens 3 of Modification 1 is not provided with the recess 34, it is possible to reduce the peak of the amount of light near -40° in the forward direction.

Further, in the lens 3 of Modification 2, the third distance L3 from the third incident surface 323 to the third exit surface 333 on the first virtual plane VS1 is It is formed so that it becomes longer as it becomes longer (see FIG. 15). On the other hand, in the lens 3 according to the embodiment and the lens 3 of Modification 1, the distance from the third incident surface 323 to the third exit surface 333 on the first virtual plane VS1 is the distance from the reference surface N1 to the first virtual plane VS1 It is constant regardless of the distance to (see FIGS. 8 and 14).

The lens 3 of Modification 2 is formed so that the third distance L3 increases as the distance from the reference plane N1 to the first virtual plane VS1 increases. Compared to the lens 3, the downward light distribution can be increased.

As described above, the lens (3) according to the first aspect comprises a lens body (30) made of a translucent material. The lens body (30) has a first concave portion (31A) recessed inward from the reference surface (N1) of the lens body (30), a recess inward from the reference surface (N1) of the lens body (30), and , and a second recess (31B) connected to the first recess (31A). The lens body (30) has a first incident surface (321) provided on the surface of the first recess (31A) and on which light emitted from the solid-state light source (LED module 2) is incident. The lens body (30) is provided on the surface of the lens body (30) located on the opposite side of the reference surface (N1) and faces the first incident surface (321) in parallel with the optical axis (A1) of the solid-state light source. It has a first exit surface (331) that The lens body (30) has a second incident surface (322) provided on the surface of the second concave portion (31B) and on which light emitted from the solid-state light source is incident. The lens body (30) has a second exit surface (332) provided on the surface of the lens body (30) and facing the second entrance surface (322) in parallel with the optical axis (A1). A first distance (L1) from the first incident surface (321) to the first exit surface (331) and a first distance (L1) from the second incident surface (322) on a first virtual plane (VS1) parallel to the reference surface (N1). The second distance (L2) to the second exit surface (332) increases as the distance between the first virtual plane (VS1) and the reference surface (N1) decreases. A cross section of the lens body (30) taken along a second virtual plane (VS2) that is parallel to the optical axis (A1) and intersects the alignment direction of the first recess (31A) and the second recess (31B). In terms of shape, the outline of the second incident surface (322) has the same shape regardless of the distance between the second virtual plane (VS2) along the alignment direction and the optical axis (A1).

The lens (3) according to the first aspect distributes light in one direction (the direction in which the first concave portion and the second concave portion are arranged) while intersecting the one direction (parallel to the reference plane and It is possible to improve the light distribution characteristics in the direction intersecting with.

A lens (3) according to the second aspect can be realized in combination with any one of the first aspect. In the lens (3) according to the second aspect, the second distance (L2) from the second entrance surface (322) to the second exit surface (332) on the first virtual plane (VS1) is It is preferable that the longer the distance from the optical axis (A1), the shorter the distance.

The lens (3) according to the second aspect can further improve the light distribution characteristics in the direction intersecting one direction.

A lens (3) according to the third aspect can be realized in combination with the first or second aspect. In the lens (3) according to the third aspect, the second entrance surface (322) has a convex curved surface (324) protruding toward the second concave portion (31B) and a second exit surface (332). It preferably has a concave curved surface (325) that The convex curved surface (324) is preferably arranged on the side closer to the reference plane (N1) than the concave curved surface (325).

The lens (3) according to the third aspect can further improve light distribution characteristics in a direction intersecting one direction.

A lens (3) according to the fourth aspect can be realized by a combination with any one of the first to third aspects. In the lens (3) according to the fourth aspect, at least part of the first entrance surface (321) and the second entrance surface (322) is the light emitting region of the solid-state light source when viewed along the optical axis (A1). (21) is preferred.

The lens (3) according to the fourth aspect can efficiently cause the light emitted from the solid-state light source to enter the first entrance surface (321) and the second entrance surface (322).

A lens (3) according to the fifth aspect can be realized by a combination with any one of the first to fourth aspects. In the lens (3) according to the fifth aspect, the lens body (30) has a third incident surface facing the first incident surface (321) along the reference surface (N1) on the surface of the second concave portion (31B). (323) is preferred. The lens body (30) preferably has a third exit surface (333) provided on the surface of the lens body (30) and facing the third entrance surface (323) in parallel with the optical axis (A1). It is preferable that the third incident surface (323) is formed in a planar shape.

The lens (3) according to the fifth aspect reflects a part of the light emitted from the solid-state light source on the third incident surface (323), so that the first incident surface (321) and the second incident surface (322) ) can be increased.

A lens (3) according to the sixth aspect can be realized in combination with the fifth aspect. In the lens (3) according to the sixth aspect, the third distance (L3) from the third incident surface (323) to the third exit surface (333) on the first virtual plane (VS1) is the reference plane (N1 ) to the first virtual plane (VS1) is preferably longer.

The lens (3) according to the sixth aspect can improve the light distribution characteristics in the direction of the optical axis (A1).

A lens (3) according to the seventh aspect can be realized by a combination with any one of the first to sixth aspects. In the lens (3) according to the seventh aspect, the reference surface (N1) of the lens body (30) is provided with an inwardly recessed concave portion surrounding the first concave portion (31A) and the second concave portion (31B). A point (34) is preferably provided.

The lens (3) according to the seventh aspect allows the electric wire for feeding the solid-state light source to escape through the recess (34).

A lens (3) according to the eighth aspect can be realized by a combination with any one of the first to seventh aspects. The lens (3) according to the eighth aspect preferably has a flange (35) projecting outward from the surface of the lens body (30) along the reference plane (N1).

The lens (3) according to the eighth aspect can easily fix the lens body (30) by the flange (35).

A lens (3) according to the ninth aspect can be realized by a combination with any one of the first to eighth aspects. In the lens (3) according to the ninth aspect, it is preferable that one or more positioning portions ( ) are provided on the reference plane (N1) of the lens body (30). The positioning part is preferably positioned with respect to the mounting surface of the member (LED holder 16) to which the lens body (30) is mounted.

The lens (3) according to the ninth aspect can be easily positioned with respect to the member (LED holder 16).

A lighting device (emergency light source unit 14) according to a tenth aspect includes a lens (3) according to any one of the first to ninth aspects, and a light emitting region (21) on an incident surface (32) of the lens (3). ) facing each other.

The lighting device according to the tenth aspect distributes light in one direction (the direction in which the first recess and the second recess are arranged) while intersecting the one direction (parallel to the reference plane and intersecting the arrangement direction). direction) can be improved.

A lighting fixture (1) according to an eleventh aspect includes the lighting device according to the tenth aspect, and a fixture body (10) that supports the lighting device.

The lighting fixture (1) according to the eleventh aspect distributes light in one direction (the direction in which the first recess and the second recess are arranged) and intersects the one direction (parallel to the reference plane and the alignment). direction) can be improved.

1 lighting equipment 2 LED module (solid-state light source)
3 lens 10 fixture body 14 emergency light source unit (lighting device)
21 light emitting region 30 lens main body 31 recess 32 incident surface 33 exit surface 34 recess 321 first incident surface 322 second incident surface 323 third incident surface 324 convex surface 325 concave surface D1 first direction D2 second direction A1 optical axis

Claims (11)

A lens for controlling light distribution of a solid-state light source,
A lens body made of a translucent material, having one end surface in the direction along the optical axis of the solid-state light source as a reference surface, and having an exit surface on the other end surface in the direction along the optical axis. prepared,
The lens body is
a first concave portion recessed in a direction from the reference plane, which is a plane orthogonal to the optical axis , toward the emission surface ;
a second recess recessed in a direction from the reference surface toward the output surface and connected to the first recess;
a first incident surface provided on the surface of the first concave portion and on which light emitted from the solid -state light source is incident;
a first exit surface included in the exit surface and facing the first entrance surface along the optical axis;
a second incident surface provided on the surface of the second concave portion and on which the light is incident;
a second exit surface included in the exit surface and facing the second entrance surface along the optical axis;
has
A first distance from the first incidence surface to the first exit surface and a second distance from the second incidence surface to the second exit surface on a first imaginary plane parallel to the reference plane are The shorter the distance between the virtual plane of and the reference plane, the longer the
In the cross-sectional shape of the lens body taken along a second imaginary plane that is parallel to the optical axis and intersects the alignment direction of the first recess and the second recess, the outline of the second incident surface has the same shape regardless of the distance between the second virtual plane and the optical axis along the alignment direction,
lens. A second distance from the second entrance surface to the second exit surface on the first virtual plane becomes shorter as the distance from the optical axis increases along the alignment direction.
A lens according to claim 1 . The second incident surface is
a convex curved surface protruding toward the second recess;
a concave curved surface protruding toward the second output surface;
The convex curved surface is arranged on a side closer to the reference surface than the concave curved surface,
3. A lens according to claim 1 or 2. At least a part of the first incident surface and the second incident surface overlaps a light-emitting region of the solid-state light source when viewed along the optical axis.
A lens according to any one of claims 1 to 3. The lens body is
a third incident surface facing the first incident surface along the reference surface on the surface of the second concave portion;
a third exit surface facing the third entrance surface along a direction intersecting the optical axis;
has
wherein the third incident surface is formed in a planar shape;
A lens according to any one of claims 1 to 4. A third distance from the third incident surface to the third exit surface on the first virtual plane increases as the distance from the reference surface to the first virtual plane increases.
A lens according to claim 5 . The reference surface of the lens body is provided with an inward recess that surrounds the first recess and the second recess,
A lens according to any one of claims 1-6. a flange projecting outwardly from the exit surface along the reference surface;
A lens according to any one of claims 1-7. one or more positioning portions are provided on the reference surface of the lens body;
The positioning portion is positioned with respect to a mounting surface of a member to which the lens body is mounted,
A lens according to any one of claims 1-8. A lens according to any one of claims 1 to 9;
and the solid-state light source arranged so that the light-emitting regions face the first incident surface and the second incident surface of the lens,
lighting device. a lighting device according to claim 10;
a fixture body that supports the lighting device;
lighting equipment.

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