JPWO2018025816A1 - Reflector and lighting device - Google Patents

Abstract

The reflector (3) comprises a plurality of first reflecting surfaces (31) and a second reflecting surface (32). The plurality of first reflection surfaces (31) are respectively disposed around the plurality of LED devices on the front side in the optical axis direction with respect to the light emission surfaces of the plurality of LED devices linearly arranged. The second reflective surface (32) is disposed on the front side in the optical axis direction of the plurality of first reflective surfaces (31). The second reflective surface (32) extends continuously in the longitudinal direction on one side in the width direction of the LED device array. In the reflector (3), in each LED cross section, the first reflection surfaces (31) are disposed on both sides in the width direction, and go outward in the width direction from the LED devices toward the front in the optical axis direction. In each LED cross section, the second reflection surface (32) goes outward in the width direction as it goes to the front side in the optical axis direction. Thereby, the desired illuminance of the illumination light can be realized while suppressing the luminance unevenness due to the plurality of LED devices.

Description

  The present invention relates to a reflector for a lighting device and a lighting device provided with the reflector.

  BACKGROUND Conventionally, an LED lighting device using an LED (Light Emitting Diode) as a light source has been used. For example, the LED lighting device of Japanese Patent Application Laid-Open No. 2013-105604 (Document 1) includes a plurality of LEDs and a reflector that guides light emitted from the plurality of LEDs downward. The reflector comprises a plurality of mutually independent recesses arranged in a grid, and the LEDs are disposed on top of the respective recesses that are recessed upward. In each of the recesses, a light shield that blocks part of the light traveling from the LED to the opening surface of the recess is disposed. This prevents the part directly below the LED from being perceived as dazzling. In other words, uneven brightness due to the plurality of LEDs is suppressed.

  By the way, in the LED lighting device of the literature 1, since the light-shielding body which shields the light from LED is provided in each recessed part, the illumination intensity of the whole LED lighting device falls. Further, in the reflector, since the plurality of concave portions corresponding to the plurality of LEDs are provided independently of each other, there is a limit to the suppression of uneven brightness such as graininess of the light source by the plurality of LEDs.

  The present invention is directed to a reflector for a lighting device, and has an object to realize a desired illuminance of illumination light while suppressing luminance unevenness due to a plurality of LED devices.

  The reflector for the illumination device according to the present invention is disposed around the plurality of LED devices on the front side in the optical axis direction with respect to the light emission surface of the plurality of LED devices linearly arranged, and each is an annular concave A plurality of first reflecting surfaces, which are at least a part, and a front side of the plurality of first reflecting surfaces in the optical axis direction, and perpendicular to the longitudinal direction and the optical axis direction of the LED device array that is the plurality of LED devices And a second reflecting surface that continuously extends in the longitudinal direction on one side of the LED device row in the width direction. In each LED section perpendicular to the longitudinal direction and including the optical axis of each LED device, the first reflection surface is disposed on both sides in the width direction of each LED device, and the LED device Going outward in the width direction as it In each of the LED cross sections, the second reflective surface is directed outward in the width direction as it goes to the front side in the optical axis direction. According to the said reflector, desired illumination intensity of illumination light can be implement | achieved, suppressing the brightness nonuniformity by several LED devices.

  In one preferred embodiment of the present invention, the shape of the second reflecting surface in a cross section perpendicular to the longitudinal direction is constant over the entire length in the longitudinal direction.

  In another preferred embodiment of the present invention, the upper edge of each first reflective surface is at least a portion of an upper circumference which is a circumference, and the longitudinal direction of the two LED devices longitudinally adjacent to each other. The center-to-center distance at is less than or equal to the sum of the longitudinal radii of the upper circumferences at the two first reflective surfaces corresponding to the two LED devices.

  In another preferred embodiment of the present invention, the upper edge of each first reflective surface is at least a part of an elliptical periphery elongated in the width direction.

  In another preferred embodiment of the present invention, the upper edge of each first reflecting surface is at least a part of the upper circumference which is the circumference, and the center of the upper circumference of each of the first reflecting surfaces is It is located on the optical axis of each of the LED devices.

  In another preferred embodiment of the present invention, the upper edge of each first reflective surface is at least a part of an upper circumference that is a circumference, and the optical axis of each LED device is in the width direction, It is located between the center of the upper circumference of each first reflective surface and the second reflective surface.

  More preferably, the center of the upper circumference of the first reflective surface of at least a part of the plurality of first reflective surfaces is spaced apart from the optical axis of the LED device in the longitudinal direction.

  In another preferred embodiment of the present invention, the other one of the plurality of first reflection surfaces is disposed on the front side in the optical axis direction, and is extended continuously in the longitudinal direction on the other side in the width direction of the LED device row. The second reflecting surface is further included, and in each of the LED cross sections, the other second reflecting surface is directed outward in the width direction as it goes to the front side in the optical axis direction.

  The invention is also directed to a lighting device. The lighting device comprises any of the reflectors described above and the plurality of LED devices.

  The above objects and other objects, features, aspects and advantages of the present invention will become apparent from the detailed description of the present invention given below with reference to the attached drawings.

It is a perspective view showing the reflector of the lighting installation concerning a 1st embodiment. It is a top view of a reflector. It is a sectional view of a lighting installation. It is a sectional view of a reflector. It is a top view which expands and shows a part of reflector. It is a top view which expands and shows a part of reflector. FIG. 7 is a cross-sectional view of another preferred lighting device. It is a figure which shows the luminance distribution of an illuminating device. It is a perspective view which shows the reflector of the illuminating device which concerns on 2nd Embodiment. It is a top view of a reflector. It is a sectional view of a lighting installation. It is a sectional view of a reflector. It is a top view which expands and shows a part of reflector. It is a top view which expands and shows a part of reflector. It is a top view which shows the reflector of the illuminating device which concerns on 3rd Embodiment. It is a sectional view of a reflector. It is a top view which expands and shows a part of reflector. It is a top view which expands and shows a part of reflector. FIG. 5 is an enlarged plan view of a portion of another preferred reflector. FIG. 7 is a plan view of another preferred reflector. It is a sectional view of a reflector. FIG. 5 is an enlarged plan view of a portion of another preferred reflector. FIG. 5 is an enlarged plan view of a portion of another preferred reflector.

  FIG. 1 is a perspective view showing a reflector 3 of a lighting device according to a first embodiment of the present invention. FIG. 2 is a plan view of the reflector 3. FIG. 3 is a cross-sectional view of the reflector 3 taken along the line III-III in FIG. FIG. 4 is a cross-sectional view of the reflector 3 taken along the line IV-IV in FIG. 5 and 6 are plan views showing a part of the reflector 3 in an enlarged manner. In FIG. 3, a structure other than the reflector 3 of the lighting device 1 is also shown, and is also a cross-sectional view of the lighting device 1. Moreover, in FIG. 3, the external shape of case 5 of the illuminating device 1 is shown with a broken line. 3 and 4 also show a part of the configuration behind the cross section. In FIG. 4 to FIG. 6, the LED device 2 of the lighting device 1 is also shown.

  The lighting device 1 is used as, for example, a lighting device in a metal processing apparatus or the like. As shown in FIG. 3, the lighting device 1 includes a plurality of LED (Light Emitting Diode) devices 2, reflectors 3 for the lighting device, a circuit board 4, and a case 5. The number of LED devices 2 is, for example, 48. The plurality of LED devices 2 are fixed on, for example, the circuit board 4. The plurality of LED devices 2 are linearly arranged. In the example illustrated in FIG. 3, the plurality of LED devices 2 are linearly arranged (that is, arranged along a virtual straight line).

  In the following description, the plurality of LED devices 2 linearly arranged will also be referred to as “LED device row 20”. Moreover, the left-right direction in FIG. 3 in which the LED device array 20 extends is referred to as “longitudinal direction”. Also, the vertical direction in FIG. 2 perpendicular to the longitudinal direction is referred to as the “width direction”. The optical axis direction (that is, the direction in which the optical axis is directed) of the plurality of LED devices 2 is a direction perpendicular to the paper surface in FIG. 2, and the “front side” and “light side” It is called “axially rear side”. The width direction is a direction perpendicular to the longitudinal direction and the optical axis direction.

  As shown in FIGS. 1 to 5, the reflector 3 includes a plurality of first reflecting surfaces 31, a pair of second reflecting surfaces 32, a pair of third reflecting surfaces 33, and a frame portion 34. The frame portion 34 is an outer frame that supports the plurality of first reflection surfaces 31, the pair of second reflection surfaces 32, and the pair of third reflection surfaces 33. Each of the first reflection surface 31, the second reflection surface 32, and the third reflection surface 33 is formed, for example, by vapor-depositing a metal such as aluminum on the surface of a resin. The color of each of the first reflection surfaces 31, the second reflection surfaces 32, and the third reflection surfaces 33 is, for example, silver. Each of the first reflection surface 31, the second reflection surface 32, and the third reflection surface 33 may be, for example, a metal surface of a metal member or a resin surface of a resin member.

  As shown in FIG. 4, the plurality of first reflection surfaces 31 are disposed on the front side in the optical axis direction with respect to the light emission surfaces 21 of the plurality of LED devices 2. The light emitting surface 21 of the LED device 2 is the upper surface of the LED device 2 in FIG. 4 and is a surface through which light emitted from the LED device 2 to the outside passes. A substantially circular opening 35 centered on the optical axis J1 is provided at the rear end of the first reflecting surface 31 in the optical axis direction. As shown in FIGS. 1 to 5, the plurality of openings 35 are arranged in the longitudinal direction while being spaced apart from one another. The light emitted from the light emission surface 21 of the LED device 2 is guided forward in the optical axis direction through the opening 35.

  The number of the plurality of first reflection surfaces 31 is the same as the number of the plurality of LED devices 2. The plurality of first reflection surfaces 31 are respectively disposed around the plurality of LED devices 2 as shown in FIG. 5. The plurality of first reflection surfaces 31 are linearly arranged in the same manner as the plurality of LED devices 2. Specifically, the plurality of first reflection surfaces 31 are linearly arranged substantially in parallel to the longitudinal direction. Each of the plurality of first reflection surfaces 31 is at least a part of an annular concave surface substantially centered on the optical axis J1 of the corresponding LED device 2. In the example shown in FIG. 5, the first reflective surface 31 is provided over the entire circumference of each LED device 2.

  The pair of second reflection surfaces 32 is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31. The one second reflection surface 32 extends continuously in the longitudinal direction on one side of the LED device row 20 in the width direction. The other second reflection surface 32 extends continuously in the longitudinal direction on the other side of the LED device row 20 in the width direction. That is, the pair of second reflection surfaces 32 is disposed along the LED device array 20 substantially parallel to the longitudinal direction. The longitudinal length of each second reflective surface 32 is longer than the longitudinal length of the LED device array 20. The longitudinal length of each second reflective surface 32 is approximately the same as the longitudinal length of the plurality of first reflective surfaces 31. The shape of the pair of second reflecting surfaces 32 in a cross section perpendicular to the longitudinal direction is substantially constant over substantially the entire length in the longitudinal direction.

  The pair of second reflection surfaces 32 is continuous with the front end in the optical axis direction of the plurality of first reflection surfaces 31. The height in the optical axis direction of the pair of second reflection surfaces 32 is larger than the height in the optical axis direction of each of the plurality of first reflection surfaces 31. For example, the height in the optical axis direction of each second reflection surface 32 is twice or more and five times or less the maximum height in the optical axis direction of each first reflection surface 31. Between each two LED devices 2 adjacent in the longitudinal direction, one second reflection surface 32 and the other second reflection surface 32 do not come in contact with each other. In other words, between each two LED devices 2 adjacent in the longitudinal direction, the pair of second reflective surfaces 32 are discontinuous with each other.

  The pair of third reflection surfaces 33 is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31. The pair of third reflection surfaces 33 is located at substantially the same position as the pair of second reflection surfaces 32 in the optical axis direction. The height in the optical axis direction of the pair of third reflection surfaces 33 is substantially the same as the height in the optical axis direction of the pair of second reflection surfaces 32. One third reflection surface 33 extends in the width direction on one side of the LED device row 20 in the longitudinal direction. The other third reflective surface 33 extends in the width direction on the other side of the LED device array 20 in the longitudinal direction. The pair of third reflection surfaces 33 connects the both ends of the pair of second reflection surfaces 32 in the longitudinal direction.

  The cross section shown in FIG. 4 is a cross section perpendicular to the longitudinal direction and including the optical axis J1 of the LED device 2, and is hereinafter referred to as the “LED cross section”. As shown in FIG. 4, in the LED cross section, the first reflective surfaces 31 are disposed on both sides in the width direction of the LED device 2 (that is, both left and right sides in FIG. 4). In addition, on both sides in the width direction of the LED device 2, the first reflection surfaces 31 move outward in the width direction (that is, in a direction away from the LED device 2) from the LED device 2 toward the front side in the optical axis direction. Head. In the LED cross section, the focal position of the first reflection surface 31 is located on the optical axis J1 of the LED device 2.

  In the LED cross section, the pair of second reflection surfaces 32 is directed outward in the width direction as it goes to the front side in the optical axis direction. In the LED cross section, the focal positions of the pair of second reflective surfaces 32 are located on the optical axis J 1 of the LED device 2. In the LED cross section, for example, the inclination of the tangent of the first reflection surface 31 at the connection portion between the first reflection surface 31 and the second reflection surface 32 (that is, the boundary between the first reflection surface 31 and the second reflection surface 32) , And the inclination of the tangent of the second reflection surface 32 is different. In the example shown in FIG. 4, the angle formed by the tangent of the first reflection surface 31 in the connection portion and the optical axis J1 is larger than the angle formed by the tangent of the second reflection surface 32 in the connection portion and the optical axis J1. . Also in the LED cross section corresponding to the other LED devices 2, the shape of the first reflecting surface 31 and the shape of the second reflecting surface 32 are the same as the above-described shapes.

  As shown in FIG. 6, the upper edge 311 of each first reflective surface 31 is a part of an upper circumference 312 which is a virtual circumference centered on the optical axis J1 of each LED device 2. In FIG. 6, a portion of the upper circumference 312 which does not overlap with the upper edge 311 of the first reflecting surface 31 is drawn by a two-dot chain line. The upper circumference 312 may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIG. 6, the upper edge 311 of each first reflective surface 31 is a part of an elliptical circumference that is long in the width direction (that is, the vertical direction in FIG. 6) around the optical axis J1 of the LED device 2 . The center-to-center distance in the longitudinal direction of two LED devices 2 adjacent in the longitudinal direction (that is, the distance between two optical axes J1 adjacent in the longitudinal direction) is the two corresponding to the two LED devices 2 This is equal to or less than the sum of the radii in the longitudinal direction of the upper circumference 312 of the first reflecting surface 31.

  The lower edge 313 of each first reflective surface 31 is at least a part of a lower circumference that is an imaginary circumference centered on the optical axis J1 of each LED device 2. The first reflection surface 31 is at least a part of an annular concave surface connecting the upper circumference 312 and the lower circumference. The lower circumference may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIG. 6, the lower edge 313 of each first reflective surface 31 is the entire circumference of a perfect circle centered on the optical axis J1 of the LED device 2. Between each two LED devices 2 adjacent in the longitudinal direction, as shown in FIG. 4, a partition wall 315 by the first reflective surface 31 is located. The partition wall 315 partitions between two longitudinally adjacent openings 35. Between each two LED devices 2 adjacent in the longitudinal direction, the height in the optical axis direction of the widthwise center portion of the first reflection surface 31 (that is, the height of the widthwise center portion of the partition wall 315) is The height is smaller than the height in the optical axis direction of the other portion of the reflection surface 31.

  In the example shown in FIG. 6, the upper circumference 312 of each first reflecting surface 31 intersects the upper circumference 312 and the lower edge 313 of the first reflecting surface 31 adjacent in the longitudinal direction. Further, the upper circumference 312 of each first reflection surface 31 does not include the optical axis J1 of the first reflection surface 31 adjacent in the longitudinal direction inside. The upper circumference 312 of each first reflection surface 31 may not intersect the upper circumference 312 and the lower edge 313 of the first reflection surface 31 adjacent in the longitudinal direction, for example. In addition, the upper circumference 312 of each first reflecting surface 31 may include the optical axis J1 of the first reflecting surface 31 adjacent in the longitudinal direction, for example.

  In the illumination device 1 shown in FIG. 3, the light emitted from the plurality of LED devices 2 is reflected directly by the plurality of first reflection surfaces 31 or directly without being reflected by the first reflection surfaces 31. Guided axially forward. The light guided to the front side in the optical axis direction with respect to the plurality of first reflection faces 31 is reflected by the second reflection face 32 or directly reflected in the optical axis direction without being reflected by the second reflection face 32. It is guided forward and emitted forward from the reflector 3 in the optical axis direction.

  As described above, the reflector 3 for the lighting device 1 includes the plurality of first reflecting surfaces 31 and the second reflecting surface 32. The plurality of first reflection surfaces 31 are arranged around the plurality of LED devices 2 on the front side in the optical axis direction with respect to the light emission surfaces 21 of the plurality of LED devices 2 linearly arranged. Each of the plurality of first reflective surfaces 31 is at least a part of an annular concave surface. The second reflection surface 32 is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31. The second reflection surface 32 continuously extends in the longitudinal direction on one side of the LED device array 20 in the width direction perpendicular to the longitudinal direction and the optical axis direction of the LED device array 20 which is the plurality of LED devices 2. In the reflector 3, in each LED section perpendicular to the longitudinal direction and including the optical axis J 1 of each LED device 2, the first reflection surface 31 is disposed on both sides in the width direction of each LED device 2. Going outward in the width direction from the front to the optical axis direction. Moreover, in each LED cross section, the second reflective surface 32 goes outward in the width direction as it goes to the front side in the optical axis direction.

  As described above, in the reflector 3, by providing the plurality of first reflection surfaces 31 corresponding to the plurality of LED devices 2, the light emitted from the plurality of LED devices 2 is efficiently moved forward in the optical axis direction. It can lead well. Further, as described above, the light from the plurality of LED devices 2 and the plurality of first reflection surfaces 31 is formed by the second reflection surface 32 continuously extending in the longitudinal direction along the plurality of first reflection surfaces 31. Can be efficiently guided forward in the optical axis direction while appropriately diffusing in the longitudinal direction. Thereby, the desired illuminance of the illumination light by the illumination device 1 is suppressed while suppressing the luminance unevenness (for example, the granular feeling of the light source by each LED device or the generation of the bright line corresponding to each LED device) by the plurality of LED devices 2 Can be realized.

  As described above, the height in the optical axis direction of the second reflection surface 32 is larger than the height in the optical axis direction of the plurality of first reflection surfaces 31. Thereby, the light from the plurality of LED devices 2 and the plurality of first reflection surfaces 31 can be efficiently guided forward in the optical axis direction while being diffused more appropriately in the longitudinal direction. As a result, it is possible to achieve both the suppression of the luminance unevenness and the realization of the desired illuminance more suitably.

  In the reflector 3, the shape of the second reflecting surface 32 in a cross section perpendicular to the longitudinal direction is constant over the entire length in the longitudinal direction of the second reflecting surface 32. Thereby, when diffusing the light guided from the plurality of LED devices 2 and the plurality of first reflective surfaces 31 to the second reflective surface 32 in the longitudinal direction, the uniformity of the diffusion of the light in the longitudinal direction is improved it can. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. The shape of the second reflection surface 32 in a cross section perpendicular to the longitudinal direction may be substantially constant over substantially the entire length of the second reflection surface 32 in the longitudinal direction. Also in this case, similarly to the above, the uneven brightness due to the plurality of LED devices 2 can be further suppressed.

  In the reflector 3, the first reflective surface 31 is provided over the entire circumference of each LED device 2. Thereby, light emitted from the plurality of LED devices 2 can be more efficiently guided forward in the optical axis direction. As a result, the desired illuminance of the illumination light by the lighting device 1 can be easily realized.

  As described above, the upper edge 311 of each first reflective surface 31 is a part of the upper circumference 312 which is a circumference centered on the optical axis J1 of each LED device 2 and is adjacent to each other in the longitudinal direction The center-to-center distance in the longitudinal direction of one LED device 2 is equal to or less than the sum of the radii in the longitudinal direction of the upper circumference 312 of the two first reflective surfaces 31 corresponding to the two LED devices 2. Thereby, the space | interval of the longitudinal direction of several LED device 2 can be made small. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. In addition, the reflector 3 and the lighting device 1 can be miniaturized.

  The upper edge 311 of each first reflecting surface 31 does not have to be a part of the upper circumference 312, and may be the entire upper circumference 312. That is, the upper edge 311 of each first reflection surface 31 may be at least a part of the upper circumference 312. And the center-to-center distance in the longitudinal direction of two LED devices 2 adjacent in the longitudinal direction is the sum of the radii in the longitudinal direction of the upper circumference 312 in the two first reflective surfaces 31 corresponding to the two LED devices 2 By being the following, it is possible to further suppress the uneven brightness due to the plurality of LED devices 2 as described above. In addition, the reflector 3 and the lighting device 1 can be miniaturized.

  In the reflector 3, the upper edge 311 of each first reflective surface 31 is at least a part of an elliptical circumference that is long in the width direction around the optical axis J 1 of each LED device 2. Thereby, the spread in the width direction of the light from each LED device 2 can be enlarged. As a result, it is possible to reduce the difference between the spread in the longitudinal direction of the illumination light from the lighting device 1 and the spread in the width direction.

  As mentioned above, the reflector 3 further comprises another second reflecting surface 32. The other second reflection surface 32 is disposed on the front side of the plurality of first reflection surfaces 31 in the optical axis direction, and continuously extends in the longitudinal direction on the other side in the width direction of the LED device row 20. In each LED cross section, the other second reflection surface 32 goes outward in the width direction toward the front in the optical axis direction. Thereby, the light from the plurality of LED devices 2 and the plurality of first reflection surfaces 31 can be more efficiently guided forward in the optical axis direction while being diffused more appropriately in the longitudinal direction. As a result, it is possible to easily realize the desired illuminance of the illumination light by the lighting device 1 while further suppressing the uneven brightness due to the plurality of LED devices 2.

  In the above-described example, the reflection characteristics (e.g., the roughness and the reflectance) of the plurality of first reflection surfaces 31, the pair of second reflection surfaces 32, and the pair of third reflection surfaces 33 are the same, but not necessarily the same. It does not have to be. For example, the reflection characteristics of the plurality of first reflection surfaces 31 and the reflection characteristics of the second reflection surface 32 may be different. Specifically, for example, the roughness of the plurality of first reflection surfaces 31 is larger than the roughness of the second reflection surface 32. Thereby, color unevenness due to the aberration of each LED device 2 can be suppressed. Also, for example, the reflectance of the plurality of first reflection surfaces 31 is lower than the reflectance of the second reflection surface 32. Thereby, similarly to the above, color unevenness due to the aberration of each LED device 2 can be suppressed. The difference in the reflectance may be realized, for example, by making the material of the first reflective surface 31 different from the material of the second reflective surface 32, and the color of the first reflective surface 31 and that of the second reflective surface 32. It may be realized by making the colors different. The magnitude relation between the roughness or the reflectance of the first reflection surface 31 and the second reflection surface 32 may be variously changed in accordance with the performance required for the reflector 3.

  In the illumination device 1, as shown in FIG. 7, the diffusion plate 6 may be disposed on the front side in the optical axis direction of the reflector 3. The diffusion plate 6 is, for example, a plate-like member made of resin. The diffusion plate 6 is attached to the case 5 on the front side in the optical axis direction with respect to the pair of second reflecting surfaces 32 and the pair of third reflecting surfaces 33 of the reflector 3. The diffusion plate 6 is formed by an opening at the front end in the optical axis direction of the reflector 3 (that is, the front end in the optical axis direction of the pair of second reflection surfaces 32 and the front end in the optical axis direction of the pair of third reflection surfaces 33 Cover almost the entire opening). The diffuser plate 6 diffuses the light from the plurality of LED devices 2 and the reflector 3 while transmitting the light. Thereby, the brightness non-uniformity by the plurality of LED devices 2 can be further suppressed. The diffusion plate 6 may be provided in a lighting device provided with another reflector described later.

  FIG. 8 is a view showing the state of suppression of the luminance unevenness in the lighting device 1. Example 1 described in the left column of FIG. 8 is the lighting device 1 shown in FIGS. 1 to 6. The second embodiment is an illumination device 1 provided with the diffusion plate 6 shown in FIG. The comparative example 1 is an illuminating device which abbreviate | omitted the reflector 3 from the illuminating device 1 shown to FIGS. 1-6. In the lighting device of Comparative Example 1, the same number of LED devices as the lighting device 1 are similarly arranged on the circuit board. Each graph in the right column of FIG. 8 shows the luminance distribution in each lighting device. The horizontal axis of each graph indicates the longitudinal position of the lighting device, and the vertical axis indicates the brightness at each longitudinal position. The luminance is the luminance on the LED device array 20.

  In the lighting device of Comparative Example 1, the amplitude of luminance is large. That is, in the lighting device of Comparative Example 1, the brightness difference is large between the position where the LED device is disposed and the position where the LED device is not disposed, and the brightness unevenness due to the plurality of LED devices (for example, graininess of light source) Is large. On the other hand, in the lighting devices 1 of the first embodiment and the second embodiment, the amplitude of the luminance is reduced, and the luminance unevenness due to the plurality of LED devices 2 is suppressed. In addition, when Example 1 and Example 2 are compared in FIG. 8, uneven luminance is further suppressed in Example 2 than in Example 1. On the other hand, the illuminance directly below each LED device 2 (that is, the amount of light incident per unit area) was about 1950 lx (lux) in Example 1, about 1600 lx in Example 2, and about 430 lx in Comparative Example 1. . The first embodiment and the second embodiment can be appropriately selected according to the performance (for example, the degree of uneven brightness and the illuminance) required for the lighting device 1.

  Next, the reflector 3a of the illumination device according to the second embodiment will be described. FIG. 9 is a perspective view showing the reflector 3a. FIG. 10 is a plan view of the reflector 3a. FIG. 11 is a cross-sectional view of the reflector 3a cut at a position of XI-XI in FIG. FIG. 12 is a cross-sectional view of the reflector 3a taken along the line XII-XII in FIG. 13 and 14 are plan views showing a part of the reflector 3a in an enlarged manner. FIG. 11 also shows the structure other than the reflector 3a of the lighting device 1a, and is also a cross-sectional view of the lighting device 1a. Moreover, in FIG. 11, the external shape of case 5 of the illuminating device 1a is shown with a broken line. In FIG. 11 and FIG. 12, a part of structure behind a cross section is also shown collectively. In FIG. 12 to FIG. 14, the LED device 2 of the lighting device 1 a is also shown.

  The reflector 3a is provided with a plurality of first reflection surfaces 31a different in shape from the plurality of first reflection surfaces 31 instead of the plurality of first reflection surfaces 31 shown in FIG. The other configuration of the reflector 3a is substantially the same as that of the reflector 3 shown in FIG. 1, and in the following description, the corresponding components are denoted by the same reference numerals.

  As shown in FIG. 12, in the reflector 3 a, the plurality of first reflection surfaces 31 a are disposed on the front side in the optical axis direction with respect to the light emission surfaces 21 of the plurality of LED devices 2. The number of the plurality of first reflection surfaces 31 a is the same as the number of the plurality of LED devices 2. The plurality of first reflection surfaces 31 a are respectively disposed around the plurality of LED devices 2 as shown in FIG. 13. Each of the plurality of first reflection surfaces 31 a is a part of an annular concave surface substantially centered on the optical axis J 1 of the corresponding LED device 2. Specifically, each first reflection surface 31 a is a pair of portions positioned on both sides in the width direction of the LED device 2 in the annular concave surface. The plurality of first reflection surfaces 31 a extend continuously along the longitudinal direction on both sides in the width direction of the LED device row 20. That is, the plurality of first reflection surfaces 31 a can also be regarded as a pair of reflection surfaces which continuously extend in the longitudinal direction on both sides in the width direction of the LED device row 20.

  As shown in FIG. 10 to FIG. 13, one substantially band-like opening 35 a extending in the longitudinal direction is provided at the rear end of the plurality of first reflection surfaces 31 a in the optical axis direction. In the openings 35a, a plurality of openings which are a part of a substantially circular shape respectively provided at the end portions of the plurality of first reflection surfaces 31a on the rear side in the optical axis direction are continuous in the longitudinal direction. The longitudinal length of the opening 35 a is longer than the longitudinal length of the LED device row 20. In the reflector 3a, the part corresponded to the above-mentioned partition wall 315 (refer FIG. 4) is not provided.

  As shown in FIG. 14, the upper edge 311 a of each first reflective surface 31 a is a part of an upper circumference 312 a that is a virtual circle centered on the optical axis J 1 of each LED device 2. In FIG. 14, a portion not overlapping with the upper edge 311 a of the first reflecting surface 31 a in the upper circumference 312 a is drawn by a two-dot chain line. The upper circumference 312a may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIG. 14, the upper edge 311 a of each first reflective surface 31 a is a part of a true circumference centered on the optical axis J 1 of the LED device 2. The center-to-center distance in the longitudinal direction of the two LED devices 2 adjacent in the longitudinal direction is the sum of the radii in the longitudinal direction of the upper circumference 312 a of the two first reflective surfaces 31 a corresponding to the two LED devices 2 It is below. The center-to-center distance is also equal to or less than the radius in the longitudinal direction of the upper circumference 312a of the first reflecting surface 31a.

  The lower edge 313 a of each first reflective surface 31 a is at least a part of a lower circumference 316 a which is a virtual circumference centered on the optical axis J 1 of each LED device 2. The first reflection surface 31 a is a part of an annular concave surface connecting the upper circumference 312 a and the lower circumference 316 a. The lower circumference 316a may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIG. 14, the lower edge 313 a of each first reflective surface 31 a is a part of a true circumference centered on the optical axis J 1 of the LED device 2. The upper circumference 312a of each first reflective surface 31a intersects with the lower edge 313a of the first reflective surface 31a adjacent in the longitudinal direction. Further, the upper circumference 312a of each first reflecting surface 31a includes the optical axis J1 of the first reflecting surface 31a adjacent in the longitudinal direction inside.

  The reflector 3 a shown in FIGS. 9 to 13 includes a plurality of first reflecting surfaces 31 a and a second reflecting surface 32 in substantially the same manner as the above-described reflector 3. The plurality of first reflection surfaces 31 a are arranged around the plurality of LED devices 2 on the front side in the optical axis direction with respect to the light emission surfaces 21 of the plurality of LED devices 2 linearly arranged. Each of the plurality of first reflective surfaces 31 a is a part of an annular concave surface. The second reflection surface 32 is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31 a. The second reflection surface 32 continuously extends in the longitudinal direction on one side of the LED device row 20 in the width direction perpendicular to the longitudinal direction and the optical axis direction. In the reflector 3a, in each LED cross section, the first reflection surfaces 31a are disposed on both sides in the width direction of each LED device 2, and are directed outward in the width direction from the LED devices 2 toward the front in the optical axis direction. Moreover, in each LED cross section, the second reflective surface 32 goes outward in the width direction as it goes to the front side in the optical axis direction.

  As described above, in the reflector 3a, by providing the plurality of first reflecting surfaces 31a corresponding to the plurality of LED devices 2, the light emitted from the plurality of LED devices 2 can be efficiently moved forward in the optical axis direction. It can lead well. Further, as described above, the light from the plurality of LED devices 2 and the plurality of first reflection surfaces 31 a is obtained by the second reflection surface 32 continuously extending in the longitudinal direction along the plurality of first reflection surfaces 31 a. Can be efficiently guided forward in the optical axis direction while appropriately diffusing in the longitudinal direction. Thereby, the desired illumination intensity of the illumination light by the illuminating device 1a can be realized while suppressing the luminance unevenness due to the plurality of LED devices 2.

  Further, in the reflector 3 a, the plurality of first reflection surfaces 31 a continuously spread in the longitudinal direction along the LED device row 20. Thereby, the light from the plurality of LED devices 2 can be more appropriately diffused in the longitudinal direction. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed.

  Next, the reflector 3b of the illumination device according to the third embodiment will be described. FIG. 15 is a plan view showing the reflector 3b. FIG. 16 is a cross-sectional view of the reflector 3b taken along the line XVI-XVI in FIG. 17 and 18 are plan views showing a part of the reflector 3b in an enlarged manner. In FIG. 16, the structure other than the reflector 3b of the illuminating device 1b is also shown collectively. FIG. 16 is also a cross-sectional view of the lighting device 1 b. FIG. 16 also shows a part of the configuration behind the cross section. 16 to 18 also show the LED device 2 of the lighting device 1b.

  The reflector 3 b includes a plurality of first reflection surfaces 31 b and a pair of second reflection surfaces 32 b instead of the plurality of first reflection surfaces 31 and the pair of second reflection surfaces 32 shown in FIG. 1. Each first reflection surface 31 b and the pair of second reflection surfaces 32 b are different in shape from each first reflection surface 31 and the pair of second reflection surfaces 32. Further, the number of LED devices 2 of the lighting device 1 b is smaller than the number of LED devices 2 of the lighting device 1 described above. The other configurations of the reflector 3 b and the illumination device 1 b are substantially the same as those of the reflector 3 and the illumination device 1 described above, and in the following description, the corresponding configurations are denoted by the same reference numerals.

  The pair of second reflection surfaces 32b of the reflector 3b is continuous with the front end in the optical axis direction of the plurality of first reflection surfaces 31b. The height in the optical axis direction of the pair of second reflection surfaces 32 b is larger than the height in the optical axis direction of each of the plurality of first reflection surfaces 31 b. For example, the height in the optical axis direction of each second reflecting surface 32b is not less than twice and not more than 5 times the maximum height in the optical axis direction of each first reflecting surface 31b. Between each two LED devices 2 adjacent in the longitudinal direction, one second reflection surface 32 b and the other second reflection surface 32 b are not in contact with each other. In other words, between the two LED devices 2 adjacent in the longitudinal direction, the pair of second reflective surfaces 32 b are discontinuous with each other.

  As shown in FIG. 16, in the LED cross section, the first reflective surfaces 31 b are disposed on both sides in the width direction of the LED device 2 (that is, both left and right sides in FIG. 16). In addition, on both sides in the width direction of the LED device 2, the first reflection surfaces 31 b extend outward in the width direction (that is, in a direction away from the LED device 2) from the LED device 2 toward the front side in the optical axis direction. Head.

  In the LED cross section, the pair of second reflection surfaces 32 b goes outward in the width direction as it goes to the front side in the optical axis direction. The pair of second reflection surfaces 32 b is asymmetric with respect to the optical axis J 1 of the LED device 2. In the example shown in FIG. 16, at each position in the optical axis direction, the angle formed by the left second reflecting surface 32b and the optical axis J1 is smaller than the angle formed by the right second reflecting surface 32b and the optical axis J1. . Further, at each position in the optical axis direction, the distance in the width direction between the left second reflecting surface 32b and the optical axis J1 is the distance in the width direction between the right second reflecting surface 32b and the optical axis J1. Less than. In other words, at each position in the optical axis direction, the center in the width direction of the pair of second reflection surfaces 32b is located on the right side of the optical axis J1. In the LED cross section illustrated in FIG. 16, the center in the width direction of the pair of second reflection surfaces 32 b at each position in the optical axis direction is located on the straight line J2. In the following description, the straight line J2 is referred to as the "reflection surface axis J2". The reflective surface axis J 2 is inclined to the right with respect to the optical axis J 1 of the LED device 2. The angle between the reflective surface axis J2 and the optical axis J1 is, for example, about 10 degrees.

  In the LED cross section, for example, the inclination of the tangent of the first reflection surface 31b at the connection portion between the first reflection surface 31b and the second reflection surface 32b (that is, the boundary between the first reflection surface 31b and the second reflection surface 32b) , And the inclination of the tangent of the second reflection surface 32b is different. Also in the LED cross section corresponding to the other LED devices 2, the shape of the first reflecting surface 31 b and the shape of the second reflecting surface 32 b are the same as the above-described shapes.

  As shown in FIG. 18, the upper edge 311 of each first reflective surface 31 b is a part of an upper circumference 312 which is an imaginary circumference surrounding the optical axis J1 of each LED device 2. In FIG. 18, a portion of the upper circumference 312 which does not overlap with the upper edge 311 of the first reflecting surface 31 b is drawn by a two-dot chain line. The upper circumference 312 may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIG. 18, the upper edge 311 of each first reflection surface 31 b is a part of an elliptical circumference that is long in the width direction (that is, the vertical direction in FIG. 18). The center-to-center distance in the longitudinal direction of two LED devices 2 adjacent in the longitudinal direction (that is, the distance between two optical axes J1 adjacent in the longitudinal direction) is the two corresponding to the two LED devices 2 It is less than or equal to the sum of the radii in the longitudinal direction of the upper circumference 312 of the first reflecting surface 31 b.

  In each first reflective surface 31 b, the center 314 of the upper circumference 312 is not located on the optical axis J 1 of the LED device 2. The center 314 of the upper circumference 312 is located at a position spaced apart in the width direction from the optical axis J1. In other words, the optical axis J1 of the LED device 2 is located between the center 314 of the upper circumference 312 and the second reflective surface 32b on the left side in FIG. 16 in the width direction. In the example shown in FIG. 18, the center 314 of the upper circumference 312 is located at substantially the same position in the longitudinal direction as the optical axis J1. In other words, the center 314 of the upper circumference 312 is located in the LED cross section and is offset in the width direction from the optical axis J1.

  The lower edge 313 of each first reflective surface 31 b is at least a part of a lower circumference that is an imaginary circumference that is substantially centered on the optical axis J 1 of the LED device 2. The first reflective surface 31 b is at least a part of an annular concave surface connecting the upper circumference 312 and the lower circumference. The lower circumference may be the circumference of a true circle or the circumference of an ellipse. In the example shown in FIGS. 17 and 18, the lower edge 313 of each first reflective surface 31 b is the entire circumference of a perfect circle centered on the optical axis J 1 of the LED device 2. In the LED cross section, the center of the lower circumference of the first reflective surface 31 b and the center 314 of the upper circumference 312 are located on the reflective surface axis J 2 described above. That is, the reflective surface axis J2 indicates the centers of the first reflective surface 31b and the second reflective surface 32b in the LED cross section.

  Between each two LED devices 2 adjacent in the longitudinal direction, as shown in FIG. 16, a partition wall 315 by the first reflective surface 31 b is located. The partition wall 315 partitions between two longitudinally adjacent openings 35. Between each two LED devices 2 adjacent in the longitudinal direction, the height in the optical axis direction of the widthwise central portion of the first reflection surface 31 b (that is, the height of the widthwise central portion of the partition wall 315) is The height is smaller than the height in the optical axis direction of the other portion of the reflection surface 31b.

  In the example shown in FIG. 18, the upper circumference 312 of each first reflection surface 31 b intersects the upper circumference 312 and the lower edge 313 of the first reflection surface 31 b adjacent in the longitudinal direction. Further, the upper circumference 312 of each first reflecting surface 31 b does not include the optical axis J 1 of the first reflecting surface 31 b adjacent in the longitudinal direction inside. The upper circumference 312 of each first reflection surface 31 b may not intersect the upper circumference 312 and the lower edge 313 of the first reflection surface 31 b adjacent in the longitudinal direction, for example. Further, the upper circumference 312 of each first reflective surface 31 b may include, for example, the optical axis J 1 of the first reflective surface 31 b adjacent in the longitudinal direction.

  In the illumination device 1b, light emitted from the plurality of LED devices 2 is reflected by the plurality of first reflection surfaces 31b or directly to the front in the optical axis direction without being reflected by the first reflection surfaces 31b. It is led. The light guided to the front side in the optical axis direction with respect to the plurality of first reflection faces 31 b is reflected by the second reflection face 32 b or directly reflected in the optical axis direction without being reflected by the second reflection face 32 b. The light is guided forward and emitted forward from the reflector 3b in the optical axis direction. As described above, in the reflector 3b, the reflecting surface axis J2 indicating the centers of the first reflecting surface 31b and the second reflecting surface 32b in the LED cross section is inclined in one of the width directions with respect to the optical axis J1 of the LED device 2. Because of this, the light from the lighting device 1b is irradiated to the one side in the width direction with respect to the optical axis J1.

  As described above, the reflector 3b for the illumination device 1b includes the plurality of first reflection surfaces 31b and the second reflection surfaces 32b, as with the above-described reflector 3. The plurality of first reflection surfaces 31 b are disposed around the plurality of LED devices 2 on the front side in the optical axis direction with respect to the light emission surfaces 21 of the plurality of LED devices 2 linearly arranged. Each of the plurality of first reflective surfaces 31 b is at least a part of an annular concave surface. The second reflection surface 32 b is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31 b. The second reflection surface 32 b continuously extends in the longitudinal direction on one side of the LED device array 20 in the width direction perpendicular to the longitudinal direction and the optical axis direction of the LED device array 20 which is the plurality of LED devices 2. In the reflector 3b, in each LED cross section perpendicular to the longitudinal direction and including the optical axis J1 of each LED device 2, the first reflection surfaces 31b are disposed on both sides in the width direction of each LED device 2; Going outward in the width direction from the front to the optical axis direction. Moreover, in each LED cross section, the second reflective surface 32 b goes outward in the width direction as it goes to the front side in the optical axis direction. Thereby, like the above-mentioned reflector 3, desired illumination intensity of the illumination light by lighting installation 1b can be realized, controlling the brightness nonuniformity by a plurality of LED devices 2.

  In the reflector 3b, the shape of the second reflecting surface 32b in a cross section perpendicular to the longitudinal direction is constant over the entire length in the longitudinal direction of the second reflecting surface 32b. Thereby, when diffusing the light guided from the plurality of LED devices 2 and the plurality of first reflective surfaces 31 b to the second reflective surface 32 b in the longitudinal direction, the uniformity of the diffusion of the light in the longitudinal direction can be improved it can. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. The shape of the second reflection surface 32b in a cross section perpendicular to the longitudinal direction may be substantially constant over substantially the entire length of the second reflection surface 32b in the longitudinal direction. Also in this case, similarly to the above, the uneven brightness due to the plurality of LED devices 2 can be further suppressed.

  In the reflector 3 b, the upper edge 311 of each first reflective surface 31 b is a part of the upper circumference 312 which is the circumference, and the distance between centers in the longitudinal direction of two LED devices 2 adjacent in the longitudinal direction is It is less than or equal to the sum of the radii in the longitudinal direction of the upper circumference 312 at the two first reflective surfaces 31 b corresponding to the two LED devices 2. Thereby, the space | interval of the longitudinal direction of several LED device 2 can be made small. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. In addition, the reflector 3b and the lighting device 1b can be miniaturized.

  The upper edge 311 of each first reflecting surface 31 b does not have to be a part of the upper circumference 312, and may be the entire upper circumference 312. That is, the upper edge 311 of each first reflection surface 31 b may be at least a part of the upper circumference 312. And the center-to-center distance in the longitudinal direction of the two LED devices 2 adjacent in the longitudinal direction is the sum of the radii in the longitudinal direction of the upper circumference 312 in the two first reflective surfaces 31 b corresponding to the two LED devices 2 By being the following, it is possible to further suppress the uneven brightness due to the plurality of LED devices 2 as described above. In addition, the reflector 3b and the lighting device 1b can be miniaturized.

  In the reflector 3b, the upper edge 311 of each first reflection surface 31b is at least a part of an elliptical circumference that is long in the width direction. Thereby, the spread in the width direction of the light from each LED device 2 can be enlarged. As a result, it is possible to reduce the difference between the spread in the longitudinal direction of the illumination light from the lighting device 1 b and the spread in the width direction.

  In the reflector 3b, as described above, the upper edge of each first reflective surface 31b is at least a part of the upper circumference 312, which is the circumference, and the optical axis J1 of each LED device 2 in the width direction It is located between the center 314 of the upper circumference 312 of the first reflective surface 31 b and the second reflective surface 32 b. Thereby, the light from the plurality of LED devices 2 can be guided forward in the optical axis direction while being biased to one side in the width direction of the lighting device 1 b. As a result, in the metal processing apparatus etc. in which the illuminating device 1b is provided, the freedom degree of arrangement | positioning of the illuminating device 1b can be improved.

  On the other hand, in the reflector 3 shown in FIG. 1, the upper edge of the first reflection surface 31 is at least a part of the upper circumference 312 which is the circumference, and the center of the upper circumference 312 of each first reflection surface 31 is It is located on the optical axis J 1 of each LED device 2. Thereby, the light from the plurality of LED devices 2 can be efficiently guided in the direction substantially parallel to the optical axis direction.

  The reflector 3b shown in FIG. 15 further includes another second reflecting surface 32b as described above. The other second reflection surface 32 b is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31 b, and extends continuously in the longitudinal direction on the other side in the width direction of the LED device row 20. In each LED cross section, the other second reflection surface 32 b goes outward in the width direction as it goes to the front side in the optical axis direction. Thereby, the light from the plurality of LED devices 2 and the plurality of first reflection surfaces 31 b can be more efficiently guided forward in the optical axis direction while being diffused more appropriately in the longitudinal direction. As a result, it is possible to easily realize the desired illuminance of the illumination light by the lighting device 1 b while further suppressing the luminance unevenness due to the plurality of LED devices 2.

  In the reflector 3b, in each LED cross section, the distance in the width direction between the other second reflection surface 32b and the optical axis J1 is the width direction between the other second reflection surface 32b and the optical axis J1. Greater than distance. Thereby, the light from the plurality of LED devices 2 can be guided forward in the optical axis direction while being suitably biased to one side in the width direction of the lighting device 1 b.

  FIG. 19 is a plan view showing a part of another preferable reflector 3c in an enlarged manner. FIG. 19 shows one end of the reflector 3c in the longitudinal direction. The reflector 3c has substantially the same structure as the reflector 3b except that the first reflection surface 31c having a shape different from that of the first reflection surface 31b described above is provided at both end portions in the longitudinal direction.

  The center 314 of the upper circumference 312 of the first reflective surface 31c is not only separated in the width direction from the optical axis J1 of the LED device 2, but also separated in the longitudinal direction from the optical axis J1. Thereby, the light from the LED device 2 can be guided forward in the optical axis direction while being biased to one side in the width direction of the illumination device 1 c and one side in the longitudinal direction. In the example illustrated in FIG. 19, the center 314 of the upper circumference 312 of the first reflective surface 31 c is closer to the longitudinal end of the lighting device 1 c than the optical axis J1 of the LED device 2. Thereby, the light from the LED device 2 can be spread to the end side in the longitudinal direction (that is, in the direction away from the longitudinal central portion of the lighting device 1c).

  In the reflector 3c, the first reflection surface 31c, in which the center 314 of the upper circumference 312 is separated from the optical axis J1 in the longitudinal direction, does not necessarily have to be provided at the end in the longitudinal direction. It may be done. Alternatively, all the first reflection surfaces of the reflector 3c may be the above-described first reflection surface 31c. In other words, in the reflector 3c, the center 314 of the upper circumference 312 of the first reflection surface 31c of at least a part of the plurality of first reflection surfaces is separated from the optical axis J1 of the LED device 2 in the longitudinal direction . Thereby, similarly to the above, the light from the LED device 2 can be guided forward in the optical axis direction while being biased to one side in the width direction of the illumination device 1c and one side in the longitudinal direction.

  In the reflector 3b illustrated in FIGS. 15 to 18, the angle between the reflective surface axis J2 and the optical axis J1 is about 10 degrees, but the angle may be variously changed. For example, FIGS. 20 and 21 are a plan view and a cross-sectional view showing the reflector 3d whose angle is about 25 degrees. In the reflector 3d, the optical axis J1 of each LED device 2 is located between the center 314 of the upper circumference of each first reflective surface 31d and the second reflective surface 32d in the width direction. Thereby, similarly to the above, the light from the plurality of LED devices 2 can be guided forward in the optical axis direction while being biased to one side in the width direction of the lighting device 1 d. As a result, in the metal processing apparatus etc. in which the illuminating device 1d is provided, the freedom degree of arrangement | positioning of the illuminating device 1d can be improved.

  Further, in the reflector 3d, in the LED cross section, the center 314 of the upper circumference of the first reflecting surface 31d and the center in the width direction of the pair of second reflecting surfaces 32b are LED devices compared to the example shown in FIG. It is widely separated from the optical axis J1 of No. 2 in the width direction. Thereby, the light from the plurality of LED devices 2 can be largely biased to one side in the width direction of the lighting device 1 d.

  Various modifications are possible in the above-described lighting devices 1 and 1a to 1d and the reflectors 3 and 3a to 3d.

  For example, in the reflectors 3 and 3a, the height in the optical axis direction of the pair of second reflection surfaces 32 may be smaller than the height in the optical axis direction of each of the plurality of first reflection surfaces 31 and 31a. May be the same. Further, the shape of the pair of second reflecting surfaces 32 in the cross section perpendicular to the longitudinal direction does not necessarily have to be substantially constant over the entire longitudinal length, and may be changed depending on the longitudinal position. Partition walls 315 (see FIG. 4) of the plurality of first reflection surfaces 31 may be extended on the respective second reflection surfaces 32. Specifically, the end in the width direction of the partition wall 315 may extend upward along the second reflection surface 32 as, for example, a substantially triangular pyramidal rib. In this case, the front end in the optical axis direction of the rib is located rearward of the front end in the optical axis direction of the second reflection surface 32. Furthermore, the second reflection surface 32 may be provided only on one side in the width direction of the LED device row 20. The same applies to the reflectors 3b to 3d.

  In the LED cross section of the reflector 3, for example, the angle between the optical axis J1 and the tangent of the first reflection surface 31 at the connection between the first reflection surface 31 and the second reflection surface 32 is the second reflection surface at the connection It may be smaller than or equal to the angle formed by the tangent line 32 and the optical axis J1. Moreover, in the LED cross section of the reflector 3a, the angle between the optical axis J1 and the tangent of the first reflection surface 31a at the connection portion between the first reflection surface 31a and the second reflection surface 32, and the second reflection surface at the connection portion The angle formed by the tangent of 32 and the optical axis J1 may be the same, and one angle may be larger than the other angle. The same applies to the reflectors 3b to 3d.

  In the reflectors 3 and 3a, the plurality of LED devices 2 and the plurality of first reflection surfaces 31 and 31a do not necessarily have to be linearly arranged, and may be arranged linearly (that is, non-annular). For example, the plurality of LED devices 2 and the plurality of first reflective surfaces 31 and 31a may be arranged in an arc (that is, arranged along a virtual arc line bending in the width direction or the optical axis direction). The same applies to the reflectors 3b to 3d.

  In the above-described reflectors 3 and 3a, the plurality of first reflection surfaces 31 are arranged in a straight line, but is not limited thereto. For example, in the reflector 3e shown in FIG. 22, two first reflective surface rows 310 are arranged in the width direction. The first reflection surface array 310 is a plurality of first reflection surfaces 31 (see FIG. 4) arranged substantially parallel to the longitudinal direction. The two first reflective surface rows 310 are disposed between the pair of second reflective surfaces 32 in the width direction. In the reflector 3 e, two fourth reflection surfaces 36 extending substantially in parallel to the longitudinal direction are provided between the two first reflection surface arrays 310. The two fourth reflection surfaces 36 face the pair of second reflection surfaces 32 in the width direction. The fourth reflection surface 36 is disposed on the front side in the optical axis direction of the plurality of first reflection surfaces 31 and extends continuously in the longitudinal direction. The height of the fourth reflective surface 36 in the optical axis direction is lower than the height of the second reflective surface 32 in the optical axis direction. In other words, the front end in the optical axis direction of the fourth reflection surface 36 is more rearward than the front end in the optical axis direction of the second reflection surface 32 in the optical axis direction.

  Further, in the reflector 3f shown in FIG. 23, the three first reflection surface rows 310 (ie, the plurality of first reflection surfaces 31 arranged in the longitudinal direction) are arranged in the width direction. The three first reflective surface rows 310 are disposed between the pair of second reflective surfaces 32 in the width direction. The fourth reflection surface 36 shown in FIG. 22 is not provided between each two first reflection surface rows 310 adjacent in the width direction. Also in the reflectors 3e and 3f shown in FIG. 22 and FIG. 23, it is possible to realize the desired illuminance of the illumination light by the illumination device while suppressing the luminance unevenness by the plurality of LED devices 2 as described above.

  In the reflector 3b shown in FIG. 15, of the plurality of first reflection surfaces, only the center 314 of the upper circumference 312 of the partial first reflection surface 31b is in the width direction from the optical axis J1 of the LED device 2 in the LED cross section It may be separated. The same applies to the reflectors 3c and 3d.

  The configurations in the above embodiment and each modification may be combined as appropriate as long as no contradiction arises.

  Although the invention has been described and described in detail, the foregoing description is illustrative and not restrictive. Accordingly, numerous modifications and variations are possible without departing from the scope of the present invention.

1, 1a to 1d illumination device 2 LED device 3, 3a to 3f reflector 20 LED device array 21 light emitting surface 31, 31a to 31d first reflecting surface 32, 32b, 32d second reflecting surface 311, 311a (first reflecting surface ) Upper edge 312, 312a Upper circumference J1 Optical axis

Claims (9)

A reflector for a lighting device,
A plurality of first reflection surfaces respectively disposed around the plurality of LED devices on the front side in the optical axis direction with respect to the light emission surfaces of the plurality of LED devices linearly arranged, each being at least a portion of an annular concave surface When,
On one side of the LED device array in the longitudinal direction of the LED device array as the LED devices and the width direction perpendicular to the optical axis direction, which is disposed on the front side in the optical axis direction of the plurality of first reflecting surfaces A second reflective surface extending continuously in the longitudinal direction;
Equipped with
In each LED section perpendicular to the longitudinal direction and including the optical axis of each LED device, the first reflection surface is disposed on both sides in the width direction of each LED device, and the LED device Going outward in the width direction as you
In each of the LED cross sections, the second reflective surface is directed outward in the width direction as it goes to the front side in the optical axis direction. The reflector according to claim 1, wherein
The shape of the second reflecting surface in the cross section perpendicular to the longitudinal direction is constant over the entire length in the longitudinal direction. The reflector according to claim 1 or 2, wherein
The upper edge of each first reflective surface is at least a portion of the upper circumference which is the circumference,
The center-to-center distance in the longitudinal direction of the two longitudinally adjacent LED devices is less than or equal to the sum of the longitudinal radii of the upper circumferences of the two first reflective surfaces corresponding to the two LED devices. is there. The reflector according to any one of claims 1 to 3, wherein
The upper edge of each first reflective surface is at least a part of an elliptical circumference elongated in the width direction. The reflector according to any one of claims 1 to 4, wherein
The upper edge of each first reflective surface is at least a portion of the upper circumference which is the circumference,
The center of the upper circumference of each first reflection surface is located on the optical axis of each LED device. The reflector according to any one of claims 1 to 4, wherein
The upper edge of each first reflective surface is at least a portion of the upper circumference which is the circumference,
The optical axis of each of the LED devices is located between the center of the upper circumference of each of the first reflection surfaces and the second reflection surface in the width direction. The reflector according to claim 6, wherein
The center of the upper circumference of at least a portion of the first reflective surface of the plurality of first reflective surfaces is spaced apart from the optical axis of the LED device in the longitudinal direction. A reflector according to any one of the preceding claims, wherein
It further comprises another second reflecting surface disposed on the front side in the optical axis direction of the plurality of first reflecting surfaces, and continuously extending in the longitudinal direction on the other side in the width direction of the LED device row,
In each of the LED cross sections, the other second reflection surface goes outward in the width direction as it goes to the front side in the optical axis direction. A lighting device,
A reflector according to any one of claims 1 to 8;
The plurality of LED devices;
Equipped with

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