JP2020170720A - Reflector and illuminator - Google Patents

Abstract

To achieve desired illuminance of illumination light while suppressing luminance unevenness by a plurality of LED devices.SOLUTION: A reflector (3) includes: a plurality of first reflection surfaces (31) and a second reflection surface (32). Each of the plurality of first reflection surfaces (31) is arranged around a plurality of LED devices on an optical axis direction front side of light emission surfaces of the linearly arrayed plurality of LED devices. The second reflection surface (32) is arranged on an optical axis direction front side of the plurality of first reflection surfaces (31). The second reflection surface (32) continuously expands in a longitudinal direction on one side in a width direction of the LED device array. In the reflector (3), the first reflection surfaces (31) are arranged on both sides in the width direction and are directed outward in the width direction toward the optical axis direction front side from each LED device in each LED cross section. In each LED cross section, the second reflection surface (32) is directed outward in the width direction toward the optical axis direction front side. Accordingly, desired luminance of illumination light can be achieved while suppressing luminance unevenness by the plurality of LED devices.SELECTED DRAWING: Figure 1

Description

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

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 Patent Document 1 includes a plurality of LEDs and a reflector that guides the light emitted from the plurality of LEDs downward. The reflector is provided with a plurality of independent recesses arranged in a grid pattern, and LEDs are arranged at the top of each recess that is recessed upward. In each recess, a light-shielding body that blocks a part of the light from the LED toward the opening surface of the recess is arranged. As a result, it is possible to prevent the portion directly below the LED from being dazzled. In other words, the uneven brightness caused by the plurality of LEDs is suppressed.

Japanese Unexamined Patent Publication No. 2013-105604

By the way, in the LED lighting device of Document 1, since a light-shielding body that blocks the light from the LED is provided in each recess, the illuminance of the entire LED lighting device is lowered. Further, in the reflector, since a plurality of recesses corresponding to the plurality of LEDs are provided independently of each other, there is a limit in suppressing brightness unevenness 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 an object of the present invention is to realize a desired illuminance of illumination light while suppressing brightness unevenness caused by a plurality of LED devices.

The invention according to claim 1 is a reflector for a lighting device, which is arranged around the plurality of LED devices on the front side in the optical axis direction with respect to the light emitting surfaces of the plurality of LED devices arranged linearly. The plurality of first reflecting surfaces, each of which is at least a part of the annular concave surface, and the plurality of LED devices arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces in the longitudinal direction of the LED device row which is the plurality of LED devices. And in the width direction perpendicular to the optical axis direction, one side of the LED device row is provided with a second reflecting surface that continuously spreads in the longitudinal direction, and is perpendicular to the longitudinal direction and the light of each LED device. In each LED cross section including the shaft, first reflecting surfaces are arranged on both sides of the LED device in the width direction, and the LED devices are directed outward in the width direction from each LED device toward the front side in the optical axis direction. In each LED cross section, as the second reflecting surface faces the front side in the optical axis direction, it faces outward in the width direction. According to the reflector, it is possible to realize a desired illuminance of illumination light while suppressing brightness unevenness due to a plurality of LED devices.

The invention according to claim 2 is 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 invention according to claim 3 is the reflector according to claim 1 or 2, wherein the upper edge of each first reflecting surface is at least a part of the upper circumference which is the circumference, and is in the longitudinal direction. The distance between the centers of the two adjacent LED devices in the longitudinal direction is equal to or less than the sum of the radii of the upper circumference in the longitudinal direction of the two first reflecting surfaces corresponding to the two LED devices.

The invention according to claim 4 is the reflector according to any one of claims 1 to 3, wherein the upper edge of each first reflecting surface is at least a part of an elliptical circumference long in the width direction. ..

The invention according to claim 5 is the reflector according to any one of claims 1 to 4, wherein the upper edge of each first reflecting surface is at least a part of the upper circumference which is the circumference. The center of the upper circumference of each of the first reflecting surfaces is located on the optical axis of each of the LED devices.

The invention according to claim 6 is the reflector according to any one of claims 1 to 4, wherein the upper edge of each first reflecting surface is at least a part of the upper circumference which is the circumference. The optical axis of each LED device is located between the center of the upper circumference of each of the first reflecting surfaces and the second reflecting surface in the width direction.

The invention according to claim 7 is the reflector according to claim 6, wherein the center of the upper circumference of at least a part of the first reflecting surface among the plurality of first reflecting surfaces is the optical axis of the LED device. It is separated from the above in the longitudinal direction.

The invention according to claim 8 is the reflector according to any one of claims 1 to 7, which is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces, and is said to be the LED device row. The other side in the width direction is further provided with another second reflecting surface that continuously spreads in the longitudinal direction, and in each LED cross section, the width direction is such that the other second reflecting surface is directed toward the front side in the optical axis direction. Head outward.

The invention according to claim 9 is a lighting device, which includes the reflector according to any one of claims 1 to 8 and the plurality of LED devices.

It is a perspective view which shows the reflector of the lighting apparatus which concerns on 1st Embodiment. It is a top view of a reflector. It is sectional drawing of the lighting device. It is sectional drawing of a reflector. It is a top view which shows a part of a reflector enlarged. It is a top view which shows a part of a reflector enlarged. It is sectional drawing of another preferable lighting apparatus. It is a figure which shows the brightness distribution of a lighting apparatus. It is a perspective view which shows the reflector of the lighting apparatus which concerns on 2nd Embodiment. It is a top view of a reflector. It is sectional drawing of the lighting device. It is sectional drawing of a reflector. It is a top view which shows a part of a reflector enlarged. It is a top view which shows a part of a reflector enlarged. It is a top view which shows the reflector of the lighting apparatus which concerns on 3rd Embodiment. It is sectional drawing of a reflector. It is a top view which shows a part of a reflector enlarged. It is a top view which shows a part of a reflector enlarged. FIG. 5 is an enlarged plan view showing a part of other preferable reflectors. It is a top view which shows the other preferable reflector. It is sectional drawing of a reflector. FIG. 5 is an enlarged plan view showing a part of other preferable reflectors. FIG. 5 is an enlarged plan view showing a part of other preferable reflectors.

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 cut at the position III-III in FIG. FIG. 4 is a cross-sectional view of the reflector 3 cut at the position IV-IV in FIG. 5 and 6 are plan views showing a part of the reflector 3 in an enlarged manner. FIG. 3 also shows a structure other than the reflector 3 of the lighting device 1, and is also a cross-sectional view of the lighting device 1. Further, in FIG. 3, the outer shape of the case 5 of the lighting device 1 is shown by a broken line. In FIGS. 3 and 4, a part of the configuration deeper than the cross section is also shown. 4 to 6 also show the LED device 2 of the lighting device 1.

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

In the following description, the plurality of LED devices 2 arranged linearly are also referred to as "LED device row 20". Further, the left-right direction in FIG. 3 in which the LED device row 20 extends is referred to as a "longitudinal direction". Further, the vertical direction in FIG. 2 perpendicular to the longitudinal direction is referred to as a "width direction". The optical axis direction (that is, the direction in which the optical axis faces) of the plurality of LED devices 2 is the direction perpendicular to the paper surface in FIG. 2, and the front side and the back side of the paper surface are the "optical axis direction front side" and the "light", respectively. It is called "the rear side in the axial direction". 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 a plurality of first reflecting surfaces 31, a pair of second reflecting surfaces 32, and a pair of third reflecting surfaces 33. The first reflecting surface 31, the second reflecting surface 32, and the third reflecting surface 33 are formed, for example, by depositing a metal such as aluminum on the surface of the resin. The color of each first reflecting surface 31, each second reflecting surface 32, and each third reflecting surface 33 is, for example, silver. Each of the first reflecting surface 31, each second reflecting surface 32, and each third reflecting 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 reflecting surfaces 31 are arranged on the front side in the optical axis direction with respect to the light emitting surfaces 21 of the plurality of LED devices 2. The light emitting surface 21 of the LED device 2 is an upper surface of the LED device 2 in FIG. 4, and is a surface through which the 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 each 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 separated from each other. The light emitted from the light emitting 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 reflecting surfaces 31 is the same as the number of the plurality of LED devices 2. As shown in FIG. 5, the plurality of first reflecting surfaces 31 are respectively arranged around the plurality of LED devices 2. The plurality of first reflecting surfaces 31 are linearly arranged in the same manner as the plurality of LED devices 2. Specifically, the plurality of first reflecting surfaces 31 are linearly arranged substantially parallel to the longitudinal direction. Each of the plurality of first reflecting surfaces 31 is at least a part of an annular concave surface centered substantially on the optical axis J1 of the corresponding LED device 2. In the example shown in FIG. 5, the first reflecting surface 31 is provided over the entire circumference of each LED device 2.

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

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

The pair of third reflecting surfaces 33 are arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31. The pair of third reflecting surfaces 33 are located at substantially the same positions as the pair of second reflecting surfaces 32 in the optical axis direction. The height of the pair of third reflecting surfaces 33 in the optical axis direction is substantially the same as the height of the pair of second reflecting surfaces 32 in the optical axis direction. The first third reflecting surface 33 extends in the width direction on one side of the LED device row 20 in the longitudinal direction. The other third reflecting surface 33 extends in the width direction on the other side of the LED device row 20 in the longitudinal direction. The pair of third reflecting surfaces 33 connect both ends of the pair of second reflecting surfaces 32 in the longitudinal direction.

The cross section shown in FIG. 4 is perpendicular to the longitudinal direction and includes the optical axis J1 of the LED device 2, and is hereinafter referred to as “LED cross section”. As shown in FIG. 4, in the LED cross section, the first reflecting surface 31 is arranged on both sides in the width direction of the LED device 2 (that is, both the left and right sides in FIG. 4). Further, on both sides of the LED device 2 in the width direction, the first reflecting surfaces 31 move outward in the width direction (that is, in a direction away from the LED device 2 in the width direction) 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 reflecting surface 31 is located on the optical axis J1 of the LED device 2.

In the LED cross section, the pair of second reflecting surfaces 32 are directed outward in the width direction toward the front side in the optical axis direction. In the LED cross section, the focal position of the pair of second reflecting surfaces 32 is located on the optical axis J1 of the LED device 2. In the LED cross section, for example, the inclination of the tangent line of the first reflecting surface 31 at the connection portion between the first reflecting surface 31 and the second reflecting surface 32 (that is, the boundary between the first reflecting surface 31 and the second reflecting surface 32). , The inclination of the tangent line of the second reflecting surface 32 is different. In the example shown in FIG. 4, the angle formed by the tangent line of the first reflecting surface 31 and the optical axis J1 at the connecting portion is larger than the angle formed by the tangent line of the second reflecting surface 32 and the optical axis J1 at the connecting portion. .. In the LED cross section corresponding to the other LED device 2, the shape of the first reflecting surface 31 and the shape of the second reflecting surface 32 are the same as the above-mentioned shapes.

As shown in FIG. 6, the upper edge 311 of each first reflecting surface 31 is a part of the 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 that 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 perfect circle or the circumference of an ellipse. In the example shown in FIG. 6, the upper edge 311 of each first reflecting surface 31 is a part of an elliptical circumference long in the width direction (that is, the vertical direction in FIG. 6) about the optical axis J1 of the LED device 2. .. The distance between the centers in the longitudinal direction of each of the two LED devices 2 adjacent in the longitudinal direction (that is, the distance between the two optical axes J1 adjacent in the longitudinal direction) is two corresponding to each of the two LED devices 2. It is equal to or less than the total radius of the upper circumference 312 of the first reflecting surface 31 in the longitudinal direction.

The lower edge 313 of each first reflecting surface 31 is at least a part of the lower circumference which is a virtual circumference centered on the optical axis J1 of each LED device 2. The first reflecting 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 perfect circle or the circumference of an ellipse. In the example shown in FIG. 6, the lower edge 313 of each first reflecting surface 31 is the entire circumference of a perfect circle centered on the optical axis J1 of the LED device 2. As shown in FIG. 4, a partition wall 315 by the first reflecting surface 31 is located between each of the two LED devices 2 adjacent in the longitudinal direction. The partition wall 315 partitions between two openings 35 adjacent in the longitudinal direction. Between each of the two LED devices 2 adjacent in the longitudinal direction, the height in the optical axis direction of the central portion in the width direction of the first reflecting surface 31 (that is, the height in the central portion in the width direction of the partition wall 315) is the first. 1 It is lower than the height of other parts of the reflecting surface 31 in the optical axis direction.

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 reflecting surface 31 does not include the optical axis J1 of the first reflecting surface 31 adjacent in the longitudinal direction inside. The upper circumference 312 of each first reflecting surface 31 does not have to intersect the upper circumference 312 and the lower edge 313 of the first reflecting surface 31 adjacent in the longitudinal direction, for example. Further, the upper circumference 312 of each first reflecting surface 31 may include, for example, the optical axis J1 of the first reflecting surface 31 adjacent in the longitudinal direction inside.

In the lighting device 1 shown in FIG. 3, the light emitted from the plurality of LED devices 2 is directly reflected by the plurality of first reflecting surfaces 31 or without being reflected by the first reflecting surface 31. It is guided forward in the axial direction. Light guided to the front side in the optical axis direction from the plurality of first reflecting surfaces 31 is directly reflected in the optical axis direction without being reflected by the second reflecting surface 32 or reflected by the second reflecting surface 32. It is guided forward and is irradiated from the reflector 3 toward the front in the optical axis direction.

As described above, the reflector 3 for the lighting device 1 includes a plurality of first reflecting surfaces 31 and a second reflecting surface 32. The plurality of first reflecting 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 emitting surfaces 21 of the plurality of LED devices 2 arranged linearly. Each of the plurality of first reflecting surfaces 31 is at least a part of the annular concave surface. The second reflecting surface 32 is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31. The second reflecting surface 32 extends continuously in the longitudinal direction on one side of the LED device array 20 in the longitudinal direction and the width direction perpendicular to the optical axis direction of the LED device array 20 which is the plurality of LED devices 2. In the reflector 3, the first reflecting surfaces 31 are arranged on both sides in the width direction of each LED device 2 in each LED cross section perpendicular to the longitudinal direction and including the optical axis J1 of each LED device 2. From to the front side in the optical axis direction, it goes outward in the width direction. Further, in each LED cross section, the second reflecting surface 32 goes outward in the width direction toward the front side in the optical axis direction.

As described above, in the reflector 3, by providing the above-mentioned plurality of first reflecting surfaces 31 corresponding to the plurality of LED devices 2, the light emitted from the plurality of LED devices 2 is efficiently forward in the optical axis direction. Can lead well. Further, as described above, the second reflecting surface 32 continuously spreads in the longitudinal direction along the plurality of first reflecting surfaces 31, so that the light from the plurality of LED devices 2 and the plurality of first reflecting surfaces 31 is emitted. Can be more efficiently guided forward in the optical axis direction while being appropriately diffused in the longitudinal direction. As a result, the desired illuminance of the illumination light by the illuminating device 1 is suppressed while suppressing the uneven brightness caused by the plurality of LED devices 2 (for example, the graininess of the light source by each LED device or the generation of bright lines corresponding to each LED device). Can be realized.

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

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

In the reflector 3, the first reflecting surface 31 is provided over the entire circumference of each LED device 2. As a result, the 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 illumination device 1 can be easily realized.

As described above, the upper edge 311 of each first reflecting surface 31 is a part of the upper circumference 312 which is the circumference centered on the optical axis J1 of each LED device 2, and is adjacent 2 in the longitudinal direction. The distance between the centers in the longitudinal direction of the two LED devices 2 is equal to or less than the sum of the radii in the longitudinal direction of the upper circumference 312 on the two first reflecting surfaces 31 corresponding to the two LED devices 2. As a result, the distance between the plurality of LED devices 2 in the longitudinal direction can be reduced. As a result, the uneven brightness caused by the plurality of LED devices 2 can be further suppressed. Further, the reflector 3 and the lighting device 1 can be miniaturized.

The upper edge 311 of each first reflecting surface 31 does not necessarily 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 reflecting surface 31 may be at least a part of the upper circumference 312. Then, the distance between the centers 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 on the two first reflecting surfaces 31 corresponding to the two LED devices 2. By the following, the brightness unevenness due to the plurality of LED devices 2 can be further suppressed as described above. Further, the reflector 3 and the lighting device 1 can be miniaturized.

In the reflector 3, the upper edge 311 of each first reflecting surface 31 is at least a part of an elliptical circumference long in the width direction about the optical axis J1 of each LED device 2. As a result, the spread of the light from each LED device 2 in the width direction can be increased. As a result, the difference between the spread of the illumination light from the lighting device 1 in the longitudinal direction and the spread in the width direction can be reduced.

As described above, the reflector 3 further includes another second reflecting surface 32. The other second reflecting surface 32 is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31, and continuously spreads 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 reflecting surface 32 goes outward in the width direction toward the front side in the optical axis direction. As a result, the light from the plurality of LED devices 2 and the plurality of first reflecting surfaces 31 can be more efficiently guided forward in the optical axis direction while being more appropriately diffused in the longitudinal direction. As a result, it is possible to easily realize the desired illuminance of the illumination light by the illumination device 1 while further suppressing the luminance unevenness caused by the plurality of LED devices 2.

In the above example, the reflection characteristics (for example, roughness and reflectance) of the plurality of first reflecting surfaces 31, the pair of second reflecting surfaces 32, and the pair of third reflecting surfaces 33 are the same, but are not necessarily the same. It does not have to be. For example, the reflection characteristics of the plurality of first reflecting surfaces 31 and the reflection characteristics of the second reflecting surface 32 may be different. Specifically, for example, the roughness of the plurality of first reflecting surfaces 31 is larger than the roughness of the second reflecting surface 32. As a result, color unevenness due to aberration of each LED device 2 can be suppressed. Further, for example, the reflectance of the plurality of first reflecting surfaces 31 is lower than the reflectance of the second reflecting surface 32. As a result, color unevenness due to aberration of each LED device 2 can be suppressed in the same manner as described above. The difference in reflectance may be realized, for example, by making the material of the first reflecting surface 31 and the material of the second reflecting surface 32 different, and the color of the first reflecting surface 31 and the material of the second reflecting surface 32 may be different. It may be realized by making the color different. The magnitude relation of the roughness or the reflectance of the first reflecting surface 31 and the second reflecting surface 32 may be variously changed according to the performance required for the reflector 3.

In the lighting device 1, as shown in FIG. 7, the diffuser plate 6 may be arranged on the front side of the reflector 3 in the optical axis direction. The diffusion plate 6 is, for example, a resin plate-shaped member. The diffuser plate 6 is attached to the case 5 on the front side in the optical axis direction of the pair of second reflecting surfaces 32 and the pair of third reflecting surfaces 33 of the reflector 3. The diffuser plate 6 is formed by an opening at the front end in the optical axis direction of the reflector 3 (that is, an optical axis front edge of a pair of second reflecting surfaces 32 and an optical axis direction front edge of a pair of third reflecting surfaces 33. Covers 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. As a result, the uneven brightness caused by the plurality of LED devices 2 can be further suppressed. The diffuser plate 6 may be provided in a lighting device including another reflector described later.

FIG. 8 is a diagram showing a state of suppressing the brightness unevenness in the lighting device 1. The first embodiment described in the left column of FIG. 8 is the lighting device 1 shown in FIGS. 1 to 6. The second embodiment is the lighting device 1 provided with the diffuser plate 6 shown in FIG. 7. Comparative Example 1 is a lighting device in which the reflector 3 is omitted from the lighting device 1 shown in FIGS. 1 to 6. In the lighting device of Comparative Example 1, the same number of LED devices as those of the lighting device 1 are similarly arranged on the circuit board. Each graph in the right column of FIG. 8 shows the brightness distribution in each lighting device. The horizontal axis of each graph indicates the position of the illuminator in the longitudinal direction, and the vertical axis indicates the brightness at each position in the longitudinal direction. The brightness is the brightness on the LED device row 20.

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

Next, the reflector 3a of the lighting 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 the position of XI-XI in FIG. FIG. 12 is a cross-sectional view of the reflector 3a cut at the position of 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 a structure of the lighting device 1a other than the reflector 3a, and is also a cross-sectional view of the lighting device 1a. Further, in FIG. 11, the outer shape of the case 5 of the lighting device 1a is shown by a broken line. In FIGS. 11 and 12, a part of the configuration deeper than the cross section is also shown. 12 to 14 also show the LED device 2 of the lighting device 1a.

The reflector 3a includes a plurality of first reflecting surfaces 31a having a shape different from that of the plurality of first reflecting surfaces 31 in place of the plurality of first reflecting surfaces 31 shown in FIG. Other configurations of the reflector 3a are substantially the same as those of the reflector 3 shown in FIG. 1, and in the following description, the corresponding configurations are designated by the same reference numerals.

As shown in FIG. 12, in the reflector 3a, the plurality of first reflecting surfaces 31a are arranged on the front side in the optical axis direction with respect to the light emitting surfaces 21 of the plurality of LED devices 2. The number of the plurality of first reflecting surfaces 31a is the same as the number of the plurality of LED devices 2. As shown in FIG. 13, the plurality of first reflecting surfaces 31a are respectively arranged around the plurality of LED devices 2. Each of the plurality of first reflecting surfaces 31a is a part of an annular concave surface having the optical axis J1 of the corresponding LED device 2 as a substantially center. Specifically, each of the first reflecting surfaces 31a is a pair of portions of the annular concave surface located on both sides of the LED device 2 in the width direction. The plurality of first reflecting surfaces 31a extend continuously along the longitudinal direction on both sides of the LED device row 20 in the width direction. That is, the plurality of first reflecting surfaces 31a can be regarded as a pair of reflecting surfaces that are continuously spread in the longitudinal direction on both sides of the LED device row 20 in the width direction.

As shown in FIGS. 10 to 13, one substantially band-shaped opening 35a extending in the longitudinal direction is provided at the rear end of the plurality of first reflecting surfaces 31a in the optical axis direction. The openings 35a are a plurality of openings that are a part of a substantially circular shape provided at the rear ends of the plurality of first reflecting surfaces 31a in the optical axis direction and are continuous in the longitudinal direction. The longitudinal length of the opening 35a is longer than the longitudinal length of the LED device row 20. The reflector 3a is not provided with a portion corresponding to the above-mentioned partition wall 315 (see FIG. 4).

As shown in FIG. 14, the upper edge 311a of each first reflecting surface 31a is a part of the upper circumference 312a which is a virtual circumference centered on the optical axis J1 of each LED device 2. In FIG. 14, a portion of the upper circumference 312a that does not overlap with the upper edge 311a of the first reflecting surface 31a is drawn by a two-dot chain line. The upper circumference 312a may be a perfect circle circumference or an elliptical circumference. In the example shown in FIG. 14, the upper edge 311a of each first reflecting surface 31a is a part of the true circumference centered on the optical axis J1 of the LED device 2. The distance between the centers in the longitudinal direction of each 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 312a of the two first reflecting surfaces 31a corresponding to the two LED devices 2. It is as follows. Further, the distance between the centers 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 313a of each first reflecting surface 31a is at least a part of the lower circumference 316a which is a virtual circumference centered on the optical axis J1 of each LED device 2. The first reflecting surface 31a is a part of an annular concave surface connecting the upper circumference 312a and the lower circumference 316a. The lower circumference 316a may be a perfect circle circumference or an elliptical circumference. In the example shown in FIG. 14, the lower edge 313a of each first reflecting surface 31a is a part of the true circumference centered on the optical axis J1 of the LED device 2. The upper circumference 312a of each first reflecting surface 31a intersects the lower edge 313a of the first reflecting 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 3a shown in FIGS. 9 to 13 includes a plurality of first reflecting surfaces 31a and a second reflecting surface 32 in substantially the same manner as the above-mentioned reflector 3. The plurality of first reflecting surfaces 31a are arranged around the plurality of LED devices 2 on the front side in the optical axis direction with respect to the light emitting surfaces 21 of the plurality of LED devices 2 arranged linearly. Each of the plurality of first reflecting surfaces 31a is a part of the annular concave surface. The second reflecting surface 32 is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31a. The second reflecting surface 32 extends continuously in the longitudinal direction on one side of the LED device row 20 in the longitudinal direction and the width direction perpendicular to the optical axis direction. In the reflector 3a, in each LED cross section, the first reflecting surfaces 31a are arranged on both sides in the width direction of each LED device 2, and are directed outward in the width direction from each LED device 2 toward the front side in the optical axis direction. Further, in each LED cross section, the second reflecting surface 32 goes outward in the width direction toward the front side in the optical axis direction.

As described above, in the reflector 3a, by providing the above-mentioned plurality of first reflecting surfaces 31a corresponding to the plurality of LED devices 2, the light emitted from the plurality of LED devices 2 is efficiently forward in the optical axis direction. Can lead well. Further, as described above, the second reflecting surface 32 continuously spreads in the longitudinal direction along the plurality of first reflecting surfaces 31a, so that the light from the plurality of LED devices 2 and the plurality of first reflecting surfaces 31a Can be more efficiently guided forward in the optical axis direction while being appropriately diffused in the longitudinal direction. As a result, it is possible to realize a desired illuminance of the illumination light by the illumination device 1a while suppressing the luminance unevenness caused by the plurality of LED devices 2.

Further, in the reflector 3a, a plurality of first reflecting surfaces 31a continuously spread in the longitudinal direction along the LED device row 20. As a result, the light from the plurality of LED devices 2 can be more appropriately diffused in the longitudinal direction. As a result, the uneven brightness caused by the plurality of LED devices 2 can be further suppressed.

Next, the reflector 3b of the lighting 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 cut at the position of 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 of the lighting device 1b other than the reflector 3b is also shown. FIG. 16 is also a cross-sectional view of the lighting device 1b. In FIG. 16, a part of the configuration deeper than the cross section is also shown. 16 to 18 also show the LED device 2 of the lighting device 1b.

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

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

As shown in FIG. 16, in the LED cross section, the first reflecting surface 31b is arranged on both sides in the width direction of the LED device 2 (that is, both left and right sides in FIG. 16). Further, on both sides of the LED device 2 in the width direction, the first reflecting surfaces 31b move outward in the width direction (that is, in a direction away from the LED device 2 in the width direction) from the LED device 2 toward the front side in the optical axis direction. Head.

In the LED cross section, the pair of second reflecting surfaces 32b are directed outward in the width direction toward the front side in the optical axis direction. The pair of second reflecting surfaces 32b are asymmetrical with respect to the optical axis J1 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 second reflecting surface 32b on the left side and the optical axis J1 is smaller than the angle formed by the second reflecting surface 32b on the right side and the optical axis J1. .. Further, at each position in the optical axis direction, the distance in the width direction between the second reflecting surface 32b on the left side and the optical axis J1 is the distance in the width direction between the second reflecting surface 32b on the right side and the optical axis J1. Smaller than In other words, at each position in the optical axis direction, the center of the pair of second reflecting surfaces 32b in the width direction is located on the right side of the optical axis J1. In the LED cross section illustrated in FIG. 16, the center of the pair of second reflecting surfaces 32b in the width direction 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 a "reflection surface axis J2". The reflection surface axis J2 is inclined to the right with respect to the optical axis J1 of the LED device 2. The angle formed by the reflecting 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 line of the first reflecting surface 31b at the connection portion between the first reflecting surface 31b and the second reflecting surface 32b (that is, the boundary between the first reflecting surface 31b and the second reflecting surface 32b). , The inclination of the tangent line of the second reflecting surface 32b is different. In the LED cross section corresponding to the other LED device 2, the shape of the first reflecting surface 31b and the shape of the second reflecting surface 32b are the same as the above-mentioned shapes.

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

In each first reflecting surface 31b, the center 314 of the upper circumference 312 is not located on the optical axis J1 of the LED device 2. The center 314 of the upper circumference 312 is located at a position separated from the optical axis J1 in the width direction. 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 reflecting 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 deviated from the optical axis J1 in the width direction.

The lower edge 313 of each first reflecting surface 31b is at least a part of the lower circumference which is a virtual circumference about the optical axis J1 of the LED device 2. The first reflecting surface 31b 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 perfect circle or the circumference of an ellipse. In the examples shown in FIGS. 17 and 18, the lower edge 313 of each first reflecting surface 31b is the entire circumference of a perfect circle centered on the optical axis J1 of the LED device 2. In the LED cross section, the center of the lower circumference of the first reflecting surface 31b and the center 314 of the upper circumference 312 are located on the above-mentioned reflecting surface axis J2. That is, the reflection surface axis J2 indicates the center of the first reflection surface 31b and the second reflection surface 32b in the LED cross section.

As shown in FIG. 16, a partition wall 315 by the first reflecting surface 31b is located between each of the two LED devices 2 adjacent in the longitudinal direction. The partition wall 315 partitions between two openings 35 adjacent in the longitudinal direction. Between each of the two LED devices 2 adjacent to each other in the longitudinal direction, the height in the optical axis direction of the central portion in the width direction of the first reflecting surface 31b (that is, the height in the central portion in the width direction of the partition wall 315) is the first. 1 It is lower than the height of the other part of the reflecting surface 31b in the optical axis direction.

In the example shown in FIG. 18, the upper circumference 312 of each first reflecting surface 31b intersects the upper circumference 312 and the lower edge 313 of the first reflecting surface 31b adjacent in the longitudinal direction. Further, the upper circumference 312 of each first reflecting surface 31b does not include the optical axis J1 of the first reflecting surface 31b adjacent in the longitudinal direction inside. The upper circumference 312 of each first reflecting surface 31b does not have to intersect the upper circumference 312 and the lower edge 313 of the first reflecting surface 31b adjacent to each other in the longitudinal direction, for example. Further, the upper circumference 312 of each first reflecting surface 31b may include, for example, the optical axis J1 of the first reflecting surface 31b adjacent in the longitudinal direction inside.

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

As described above, the reflector 3b for the lighting device 1b includes a plurality of first reflecting surfaces 31b and a second reflecting surface 32b, similarly to the reflector 3 described above. The plurality of first reflecting surfaces 31b are arranged around the plurality of LED devices 2 on the front side in the optical axis direction with respect to the light emitting surfaces 21 of the plurality of LED devices 2 arranged linearly. Each of the plurality of first reflecting surfaces 31b is at least a part of the annular concave surface. The second reflecting surface 32b is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31b. The second reflecting surface 32b extends continuously in the longitudinal direction on one side of the LED device array 20 in the longitudinal direction and the width direction perpendicular to the optical axis direction of the LED device array 20 which is the plurality of LED devices 2. In the reflector 3b, the first reflecting surfaces 31b are arranged on both sides in the width direction of each LED device 2 in each LED cross section perpendicular to the longitudinal direction and including the optical axis J1 of each LED device 2. From to the front side in the optical axis direction, it goes outward in the width direction. Further, in each LED cross section, the second reflecting surface 32b faces outward in the width direction toward the front side in the optical axis direction. As a result, it is possible to realize the desired illuminance of the illumination light by the illumination device 1b while suppressing the luminance unevenness due to the plurality of LED devices 2 as in the reflector 3 described above.

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

In the reflector 3b, the upper edge 311 of each first reflecting surface 31b is a part of the upper circumference 312 which is the circumference, and the distance between the centers in the longitudinal direction of the two LED devices 2 adjacent in the longitudinal direction is determined. It is equal to or less than the sum of the radii in the longitudinal direction of the upper circumference 312 of the two first reflecting surfaces 31b corresponding to the two LED devices 2. As a result, the distance between the plurality of LED devices 2 in the longitudinal direction can be reduced. As a result, the uneven brightness caused by the plurality of LED devices 2 can be further suppressed. Further, the reflector 3b and the lighting device 1b can be miniaturized.

The upper edge 311 of each first reflecting surface 31b does not necessarily 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 reflecting surface 31b may be at least a part of the upper circumference 312. Then, the distance between the centers in the longitudinal direction of the two LED devices 2 adjacent to each other in the longitudinal direction is the sum of the radii in the longitudinal direction of the upper circumference 312 on the two first reflecting surfaces 31b corresponding to the two LED devices 2. By the following, the brightness unevenness due to the plurality of LED devices 2 can be further suppressed as described above. Further, the reflector 3b and the lighting device 1b can be miniaturized.

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

In the reflector 3b, as described above, the upper edge of each first reflecting 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 is each in the width direction. It is located between the center 314 of the upper circumference 312 of the first reflecting surface 31b and the second reflecting surface 32b. As a result, 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 1b. As a result, in a metal processing device or the like provided with the lighting device 1b, the degree of freedom in arranging the lighting device 1b can be improved.

On the other hand, in the reflector 3 shown in FIG. 1, the upper edge of the first reflecting 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 reflecting surface 31 is. It is located on the optical axis J1 of each LED device 2. As a result, the light from the plurality of LED devices 2 can be efficiently guided in a 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 reflecting surface 32b is arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces 31b, and continuously spreads 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 reflecting surface 32b faces outward in the width direction toward the front side in the optical axis direction. As a result, the light from the plurality of LED devices 2 and the plurality of first reflecting surfaces 31b can be more efficiently guided forward in the optical axis direction while being more appropriately diffused in the longitudinal direction. As a result, it is possible to easily realize the desired illuminance of the illumination light by the illumination device 1b while further suppressing the brightness 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 reflecting surface 32b and the optical axis J1 is the width direction between the other second reflecting surface 32b and the optical axis J1. Greater than the distance. As a result, 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 1b.

FIG. 19 is an enlarged plan view showing a part of another preferable reflector 3c. 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 reflecting surface 31c having a shape different from that of the first reflecting surface 31b is provided at both ends in the longitudinal direction.

The center 314 of the upper circumference 312 of the first reflecting surface 31c is not only separated from the optical axis J1 of the LED device 2 in the width direction, but also separated from the optical axis J1 in the longitudinal direction. As a result, 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 and one side in the longitudinal direction of the lighting device 1c. In the example shown in FIG. 19, the center 314 of the upper circumference 312 of the first reflecting surface 31c is closer to the end portion in the longitudinal direction of the lighting device 1c than the optical axis J1 of the LED device 2. As a result, the light from the LED device 2 can be spread toward the end side in the longitudinal direction (that is, in the direction away from the central portion in the longitudinal direction of the lighting device 1c).

In the reflector 3c, the first reflecting surface 31c in which the center 314 of the upper circumference 312 is separated from the optical axis J1 in the longitudinal direction is not necessarily provided at the end portion in the longitudinal direction, and is provided at another portion. May be done. Alternatively, all the first reflecting surfaces of the reflector 3c may be the above-mentioned first reflecting surface 31c. In other words, in the reflector 3c, the center 314 of the upper circumference 312 of at least a part of the first reflecting surfaces 31c among the plurality of first reflecting surfaces is separated from the optical axis J1 of the LED device 2 in the longitudinal direction. .. As a result, 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 and one side in the longitudinal direction of the lighting device 1c.

In the reflector 3b illustrated in FIGS. 15 to 18, the angle formed by the reflecting surface axis J2 and the optical axis J1 is about 10 degrees, but the angle may be changed in various ways. For example, FIGS. 20 and 21 are a plan view and a cross-sectional view showing a reflector 3d having an angle of 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 reflecting surface 31d and the second reflecting surface 32d in the width direction. As a result, 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 1d. As a result, in a metal processing device or the like provided with the lighting device 1d, the degree of freedom in arranging the lighting 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 of the pair of second reflecting surfaces 32b in the width direction are the LED devices as compared with the example shown in FIG. It is largely separated from the optical axis J1 of 2 in the width direction. As a result, the light from the plurality of LED devices 2 can be largely biased to one side in the width direction of the lighting device 1d.

Various changes can be made in the above-mentioned lighting devices 1, 1a to 1d and reflectors 3, 3a to 3d.

For example, in the reflectors 3 and 3a, the height of the pair of second reflecting surfaces 32 in the optical axis direction may be smaller than the height of the plurality of first reflecting surfaces 31 and 31a in the optical axis direction. May be the same as. 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 length in the longitudinal direction, and may be changed depending on the position in the longitudinal direction. A plurality of partition walls 315 (see FIG. 4) of the first reflective surface 31 may extend on each of the second reflective surfaces 32. Specifically, the widthwise end of the partition wall 315 may extend upward along the second reflecting surface 32, for example, as a substantially triangular pyramid-shaped rib. In this case, the front end of the rib in the optical axis direction is located behind the front edge of the second reflecting surface 32 in the optical axis direction. Further, the second reflecting 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 formed by the tangent line of the first reflecting surface 31 and the optical axis J1 at the connecting portion between the first reflecting surface 31 and the second reflecting surface 32 is the second reflecting surface at the connecting portion. It may be smaller than the angle formed by the tangent of 32 and the optical axis J1, and may be the same as the angle. Further, in the LED cross section of the reflector 3a, the angle formed by the tangent line of the first reflecting surface 31a at the connecting portion between the first reflecting surface 31a and the second reflecting surface 32 and the optical axis J1 and the second reflecting surface at the connecting 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. 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 reflecting surfaces 31, 31a do not necessarily have to be arranged linearly, but may be arranged linearly (that is, acyclic). For example, the plurality of LED devices 2 and the plurality of first reflecting surfaces 31, 31a may be arranged in an arc shape (that is, arranged along a virtual arc shape line that bends in the width direction or the optical axis direction). The same applies to the reflectors 3b to 3d.

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

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

In the reflector 3b shown in FIG. 15, of the plurality of first reflecting surfaces, only the center 314 of the upper circumference 312 of a part of the first reflecting surfaces 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 above-described embodiments and configurations in each modification may be appropriately combined as long as they do not conflict with each other.

Although the invention has been described and described in detail, the above description is exemplary and not limiting. Therefore, it can be said that many modifications and modes are possible without departing from the scope of the present invention.

1,1a to 1d Lighting device 2 LED device 3,3a to 3f Reflector 20 LED device row 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

The reflector for the lighting device according to the present invention is arranged around the plurality of LED devices on the front side in the optical axis direction with respect to the light emitting surface of the plurality of LED devices arranged linearly, and each of them has an annular concave surface. A plurality of first reflecting surfaces which are at least a part thereof and the plurality of first reflecting surfaces which are arranged on the front side in the optical axis direction and are perpendicular to the longitudinal direction and the optical axis direction of the LED device rows which are the plurality of LED devices. Each LED cross section includes a second reflective surface that continuously extends in the longitudinal direction on one side of the LED device row in the width direction, is perpendicular to the longitudinal direction, and includes an optical axis of each LED device. in the first reflecting surface, the are arranged on both sides in the width direction of the LED device, the composed by the curve will suited to the width outward toward the free front side in the optical axis direction from each LED device In each of the LED cross sections, the second reflecting surface is directed outward in the width direction from the front edge in the optical axis direction of the first reflecting surface toward the front side in the optical axis direction, and the first reflecting surface is formed. It is composed of a curve that extends outward in the width direction from the constituent curve, and the height of the second reflecting surface in the optical axis direction is greater than the height of each of the plurality of first reflecting surfaces in the optical axis direction. Is also big. According to the reflector, it is possible to realize a desired illuminance of illumination light while suppressing brightness unevenness due to a plurality of LED devices.

In the technique related to the present invention , in the reflectors 3 and 3a, the height of the pair of second reflecting surfaces 32 in the optical axis direction is smaller than the height of each of the plurality of first reflecting surfaces 31, 31a in the optical axis direction. It may be the same as the height concerned. In the present invention, 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 length in the longitudinal direction, and may be changed depending on the position in the longitudinal direction. Good. A plurality of partition walls 315 (see FIG. 4) of the first reflective surface 31 may extend on each of the second reflective surfaces 32. Specifically, the widthwise end of the partition wall 315 may extend upward along the second reflecting surface 32, for example, as a substantially triangular pyramid-shaped rib. In this case, the front end of the rib in the optical axis direction is located behind the front edge of the second reflecting surface 32 in the optical axis direction. Further, the second reflecting 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.

Claims (9)

A reflector for lighting equipment
A plurality of first reflecting surfaces arranged around the plurality of LED devices on the front side in the optical axis direction from the light emitting surfaces of the plurality of LED devices arranged linearly, each of which is at least a part of an annular concave surface. When,
The plurality of first reflecting surfaces are arranged on the front side in the optical axis direction, and on one side of the LED device row in the longitudinal direction of the LED device row which is the plurality of LED devices and the width direction perpendicular to the optical axis direction. The second reflective surface that continuously spreads in the longitudinal direction,
With
In each LED cross section perpendicular to the longitudinal direction and including the optical axis of each LED device, first reflecting surfaces are arranged on both sides of the LED device in the width direction, and the front side in the optical axis direction from each LED device. Going outward in the width direction toward
A reflector characterized in that, in each of the LED cross sections, the second reflecting surface is directed outward in the width direction as it is directed toward the front side in the optical axis direction. The reflector according to claim 1.
A reflector characterized in that 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. The reflector according to claim 1 or 2.
The upper edge of each first reflective surface is at least a part of the upper circumference, which is the circumference.
The distance between the centers of the two LED devices adjacent in the longitudinal direction in the longitudinal direction is equal to or less than the sum of the radii of the upper circumference in the longitudinal direction of the two first reflecting surfaces corresponding to the two LED devices. A reflector characterized by being. The reflector according to any one of claims 1 to 3.
A reflector characterized in that the upper edge of each first reflecting surface is at least a part of an elliptical circumference long in the width direction. The reflector according to any one of claims 1 to 4.
The upper edge of each first reflective surface is at least a part of the upper circumference, which is the circumference.
A reflector characterized in that the center of the upper circumference of each of the first reflecting surfaces is located on the optical axis of each of the LED devices. The reflector according to any one of claims 1 to 4.
The upper edge of each first reflective surface is at least a part of the upper circumference, which is the circumference.
A reflector characterized in that the optical axis of each LED device is located between the center of the upper circumference of each of the first reflecting surfaces and the second reflecting surface in the width direction. The reflector according to claim 6.
A reflector characterized in that the center of the upper circumference of at least a part of the plurality of first reflecting surfaces is separated from the optical axis of the LED device in the longitudinal direction. The reflector according to any one of claims 1 to 7.
Further provided with another second reflecting surface arranged 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.
A reflector in each LED cross section, wherein the other second reflecting surface moves outward in the width direction toward the front side in the optical axis direction. It ’s a lighting device,
The reflector according to any one of claims 1 to 8.
With the plurality of LED devices
A lighting device characterized by being provided with.

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