WO2018025816A1

WO2018025816A1 - Reflector and lighting device

Info

Publication number: WO2018025816A1
Application number: PCT/JP2017/027747
Authority: WO
Inventors: 昌順池田; 晃山中; 高仁三輪
Original assignee: Idec株式会社
Priority date: 2016-08-01
Filing date: 2017-07-31
Publication date: 2018-02-08
Also published as: JPWO2018025816A1; JP2020170720A; JP6876051B2

Abstract

A reflector (3) is provided with a plurality of first reflective surfaces (31) and a second reflective surface (32). The plurality of first reflective surfaces (31) are each disposed around a plurality of LED devices and farther forward in the light axis direction than the light emission surface of the plurality of LED devices, which are arranged linearly. The second reflective surface (32) is disposed on the forward side of the plurality of first reflective surfaces (31) in the light axis direction. The second reflective surface (32) widens continuously in the lengthwise direction on one side of the LED device array in the width direction. In the reflector (3), the first reflective surfaces (31) are disposed on both sides of the LED cross sections in the width direction, and face outward in the width direction from the LED devices in progress toward the forward side in the light axis direction. Also, in the LED cross sections, the second reflective surface (32) faces outward in the width direction in progress toward the forward side in the light axis direction. It is thereby possible to achieve a desired illuminance of illumination light, while non-uniformity of brightness due to the plurality of LED devices is suppressed.

Description

Reflector and lighting device

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, an LED illumination device disclosed in JP 2013-105604 A (reference 1) includes a plurality of LEDs and a reflector that guides light emitted from the plurality of LEDs downward. The reflector includes a plurality of independent recesses arranged in a lattice pattern, and an LED is disposed on the top of each recess recessed upward. In each recess, a light-shielding body that blocks a part of the light traveling from the LED toward the opening surface of the recess is disposed. Thereby, it is suppressed that the part immediately under LED feels dazzling. In other words, luminance unevenness due to the plurality of LEDs is suppressed.

By the way, in the LED illuminating device of 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 illuminating device falls. Further, in the reflector, a plurality of concave portions corresponding to the plurality of LEDs are provided independently of each other, and thus there is a limit to suppression of luminance unevenness such as graininess of the light source by the plurality of LEDs.

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

The reflector for an illuminating device according to the present invention is disposed around each of the plurality of LED devices on the front side in the optical axis direction from the light emitting surface of the plurality of LED devices arranged in a line, and each of the reflectors has an annular concave surface. A plurality of first reflection surfaces that are at least a part, and arranged in front of the plurality of first reflection surfaces in the optical axis direction, and perpendicular to the longitudinal direction of the LED device row that is the plurality of LED devices and the optical axis direction And a second reflecting surface that continuously spreads in the longitudinal direction on one side of the LED device row. In each LED cross section perpendicular to the longitudinal direction and including the optical axis of each LED device, a first reflecting surface is disposed on both sides in the width direction of each LED device, and the front side in the optical axis direction from each LED device Heading outward in the width direction as heading to. In each LED cross section, the second reflecting surface goes outward in the width direction as it goes to the front side in the optical axis direction. According to the reflector, it is possible to achieve a desired illuminance of illumination light while suppressing luminance unevenness due to the plurality of 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, an upper edge of each first reflecting surface is at least a part of an upper circumference that is a circumference, and the longitudinal directions of two LED devices adjacent in the longitudinal direction Is less than or equal to the sum of the radii in the longitudinal direction of the upper circumference of the two first reflecting surfaces corresponding to the two LED devices.

In another preferred embodiment of the present invention, the upper edge of each first reflecting surface is at least part of an elliptical circumference that is long 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 that is a circumference, and the center of the upper circumference of each first reflecting surface is: Located on the optical axis of each LED device.

In another preferred embodiment of the present invention, an upper edge of each first reflecting 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, The first reflecting surface is located between the center of the upper circumference and the second reflecting surface.

More preferably, the center of the upper circumference of at least some of the plurality of first reflecting 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 plurality of first reflecting surfaces are arranged on the front side in the optical axis direction, and continuously spread in the longitudinal direction on the other side in the width direction of the LED device row. The second reflective surface is further provided, and in each LED cross section, the other second reflective surface is directed outward in the width direction toward the front side in the optical axis direction.

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

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

It is a perspective view which shows the reflector of the illuminating device which concerns on 1st Embodiment. It is a top view of a reflector. It is sectional drawing of an illuminating device. It is sectional drawing 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 sectional drawing of another preferable illuminating 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 sectional drawing of an illuminating device. It is sectional drawing 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 sectional drawing 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 expands and shows a part of other preferable reflector. It is a top view which shows another preferable reflector. It is sectional drawing of a reflector. It is a top view which expands and shows a part of other preferable reflector. It is a top view which expands and shows a part of other preferable reflector.

FIG. 1 is a perspective view showing a reflector 3 of the lighting apparatus according to the first embodiment of the present invention. FIG. 2 is a plan view of the reflector 3. 3 is a cross-sectional view of the reflector 3 taken along the line III-III in 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, the structure other than the reflector 3 of the lighting device 1 is also shown, and is 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 thru | or 6, the LED device 2 of the illuminating device 1 is shown collectively.

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 LED devices 2 is 48, for example. The plurality of LED devices 2 are fixed on the circuit board 4, for example. The plurality of LED devices 2 are arranged in a line. In the example illustrated 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 in a line are also referred to as “LED device row 20”. Moreover, the left-right direction in FIG. 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 faces) of the plurality of LED devices 2 is a direction perpendicular to the paper surface in FIG. 2, and the front side and the back side of the paper surface are “front side in the optical axis direction” and “light”, respectively. This is called “axial 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 reflection surfaces 31, a pair of second reflection surfaces 32, a pair of third reflection 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 first reflection surface 31, each second reflection surface 32, and each third reflection surface 33 are formed by evaporating a metal such as aluminum on the surface of a resin, for example. The color of each 1st reflective surface 31, each 2nd reflective surface 32, and each 3rd reflective surface 33 is silver, for example. Each first reflection surface 31, each second reflection surface 32, and each 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 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 emission surface 21 of the LED device 2 is an upper surface in FIG. 4 of the LED device 2 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 end of each first reflecting surface 31 on the rear side 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 reflection surfaces 31 are arranged in a line like the plurality of LED devices 2. Specifically, the plurality of first reflecting surfaces 31 are arranged in a straight line 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 that is substantially centered 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. One second reflecting surface 32 continuously extends in the longitudinal direction on one side of the LED device array 20 in the width direction. The other second reflecting surface 32 continuously spreads in the longitudinal direction on the other side of the LED device array 20 in the width direction. In other words, the pair of second reflecting surfaces 32 are arranged along the LED device row 20 substantially parallel to the longitudinal direction. The length in the longitudinal direction of each second reflecting surface 32 is longer than the length in the longitudinal direction of the LED device row 20. The length in the longitudinal direction of each second reflecting surface 32 is approximately the same as the length in the longitudinal direction of the plurality of first reflecting 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 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 second reflecting surface 32 in the optical axis direction is not less than twice and not more than five times the maximum height of each first reflecting surface 31 in the optical axis direction. Between each two LED devices 2 adjacent in the longitudinal direction, the one second reflecting surface 32 and the other second reflecting surface 32 do not contact each other. In other words, the pair of second reflecting surfaces 32 are discontinuous with each other between the two LED devices 2 adjacent 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 reflection surfaces 33 are located at substantially the same position as the pair of second reflection 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 one third reflecting surface 33 extends in the width direction on one side of the LED device array 20 in the longitudinal direction. The other third reflecting 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 reflecting surfaces 33 connects both ends of the pair of second reflecting 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 “LED cross section”. As shown in FIG. 4, in the LED cross section, the first reflecting surfaces 31 are arranged 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 of the LED device 2 in the width direction, the first reflecting surface 31 moves 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 positions of the pair of second reflecting surfaces 32 are located on the optical axis J1 of the LED device 2. In the LED cross section, for example, the slope 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 slope of the tangent line of the second reflecting surface 32 is different. In the example shown in FIG. 4, the angle formed between the tangent line of the first reflecting surface 31 and the optical axis J1 in the connecting portion is larger than the angle formed between the tangent line of the second reflecting surface 32 and the optical axis J1 in the connecting portion. . Also in the LED cross sections 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 shape.

As shown in FIG. 6, the upper edge 311 of each first reflecting surface 31 is a part of the upper circumference 312 that 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 with a two-dot chain line. The upper circumference 312 may be a true circle or 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 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 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) corresponds to the two LED devices 2 corresponding to the two LED devices 2. This is not more 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 reflecting surface 31 is at least part of the lower circumference that 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 that connects the upper circumference 312 and the lower circumference. The lower circumference may be a true circle or 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 J 1 of the LED device 2. As shown in FIG. 4, a partition wall 315 formed by the first reflecting surface 31 is located between each two LED devices 2 adjacent in the longitudinal direction. The partition wall 315 partitions between the two openings 35 adjacent in the longitudinal direction. Between each 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 31 (that is, the height in the central portion in the width direction of the partition wall 315) is It is lower than the height in the optical axis direction of other parts of the one reflecting surface 31.

In the example shown in FIG. 6, the upper circumference 312 of each first reflection surface 31 intersects with the upper circumference 312 and the lower edge 313 of the first reflection 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 on the inner side. Note that 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. Further, the upper circumference 312 of each first reflection surface 31 may include, for example, the optical axis J1 of the first reflection surface 31 adjacent in the longitudinal direction on the inner side.

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

As described above, the reflector 3 for the lighting device 1 includes the plurality of first reflection surfaces 31 and the second reflection surfaces 32. The plurality of first reflecting surfaces 31 are respectively 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 in a line. Each of the plurality of first reflection surfaces 31 is at least a part of an annular concave surface. The second reflecting surface 32 is disposed on the front side in the optical axis direction of the plurality of first reflecting surfaces 31. The second reflecting 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 that is the plurality of LED devices 2. In the reflector 3, the first reflecting surfaces 31 are arranged on both sides of each LED device 2 in the width direction in each LED cross section perpendicular to the longitudinal direction and including the optical axis J 1 of each LED device 2. From the front toward the front side in the optical axis direction. Moreover, in each LED cross section, the 2nd reflective surface 32 goes to the width direction outward as it goes to the optical axis direction front side.

As described above, in the reflector 3, by providing the plurality of first reflecting surfaces 31 respectively 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 guide well. In addition, as described above, the second reflection surface 32 continuously spreads in the longitudinal direction along the plurality of first reflection surfaces 31, thereby allowing 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 appropriately diffusing in the longitudinal direction. Thereby, the brightness | luminance nonuniformity (For example, the granularity of the light source by each LED device, or generation | occurrence | production of the bright line corresponding to each LED device) by several LED devices 2 is suppressed, The desired illumination intensity of the illumination light by the illuminating device 1 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. Thereby, 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 further appropriately diffusing in the longitudinal direction. As a result, the above-described suppression of luminance unevenness and realization of the desired illuminance can be more suitably achieved.

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 of the second reflecting surface 32 in the longitudinal direction. Thereby, 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, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. In addition, the shape of the 2nd reflective surface 32 in a cross section perpendicular | vertical to a longitudinal direction should just be substantially constant over substantially the full length of the longitudinal direction of the 2nd reflective surface 32. FIG. Also in this case, similarly to the above, luminance unevenness due to the plurality of LED devices 2 can be further suppressed.

In the reflector 3, the first reflecting surface 31 is provided over the entire circumference of each LED device 2. Thereby, the light radiate | emitted from several LED device 2 can be guide | induced more efficiently to the optical axis direction front. 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 that 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 distance between the centers of the two LED devices 2 in the longitudinal direction is equal to or less than the sum of the radii in the longitudinal direction of the upper circumference 312 in the two first reflecting surfaces 31 corresponding to the two LED devices 2. Thereby, the space | interval of the longitudinal direction of the some LED device 2 can be made small. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. Moreover, the reflector 3 and the illuminating device 1 can also be reduced in size.

Note that the upper edge 311 of each first reflecting surface 31 is not necessarily 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. The distance between the centers 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 of the two first reflecting surfaces 31 corresponding to the two LED devices 2. By being below, the brightness nonuniformity by the some LED device 2 can be suppressed further similarly to the above. Moreover, the reflector 3 and the illuminating device 1 can also be reduced in size.

In the reflector 3, the upper edge 311 of each first reflecting surface 31 is at least part of an elliptical circumference that is long in the width direction about the optical axis J 1 of each LED device 2. Thereby, the spread to the width direction of the light from each LED device 2 can be enlarged. As a result, the difference between the spread in the longitudinal direction of the illumination light from the illumination device 1 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 reflection surface 32 is disposed on the front side in the optical axis direction of the plurality of first reflection 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 is directed outward in the width direction toward the front side in the optical axis direction. Thereby, 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 further appropriately diffusing in the longitudinal direction. As a result, it is possible to easily realize a desired illuminance of illumination light by the illumination device 1 while further suppressing luminance unevenness due to the plurality of LED devices 2.

In the above-described example, the reflection characteristics (for example, roughness and 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 are not necessarily the same. Not necessarily. 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 greater than the roughness of the second reflection surface 32. Thereby, the color nonuniformity by the aberration of each LED device 2 can be suppressed. For example, the reflectance of the plurality of first reflection surfaces 31 is lower than the reflectance of the second reflection surface 32. Thereby, the color nonuniformity by the aberration of each LED device 2 can be suppressed similarly to the above. The difference in reflectance may be realized, for example, by making the material of the first reflecting surface 31 different from the material of the second reflecting surface 32. The color of the first reflecting surface 31 and the second reflecting surface 32 may be different from each other. It may be realized by making the color different. The magnitude relationship between the roughness or 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 illumination device 1, as shown in FIG. 7, a diffusion plate 6 may be disposed on the front side of the reflector 3 in the optical axis direction. The diffusion plate 6 is, for example, a resin plate member. The diffusing 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 diffuser plate 6 is formed by the opening at the front end in the optical axis direction of the reflector 3 (that is, the front edge in the optical axis direction of the pair of second reflecting surfaces 32 and the front edge in the optical axis direction of the pair of third reflecting surfaces 33). Covers almost the entire opening. The diffusion plate 6 diffuses while transmitting light from the plurality of LED devices 2 and the reflector 3. Thereby, the brightness nonuniformity by the some LED device 2 can be suppressed further. The diffusing plate 6 may be provided in an illuminating device including other reflectors described later.

FIG. 8 is a diagram showing how the luminance unevenness is suppressed in the lighting device 1. Example 1 described in the left column of FIG. 8 is the illuminating device 1 shown in FIGS. Example 2 is the illuminating device 1 provided with the diffusion plate 6 shown in FIG. Comparative Example 1 is an illumination device in which the reflector 3 is omitted from the illumination device 1 shown in FIGS. 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 position in the longitudinal direction of the lighting device, and the vertical axis indicates the luminance at each position in the longitudinal direction. The luminance is the luminance on the LED device row 20.

In the lighting device of Comparative Example 1, the luminance amplitude is large. That is, in the illumination device of Comparative Example 1, there is a large difference in brightness between the position where the LED device is disposed and the position where the LED device is not disposed, and luminance unevenness due to the plurality of LED devices (for example, graininess of the light source) Is big. On the other hand, in the illuminating device 1 of Example 1 and Example 2, the brightness | luminance amplitude is reduced and the brightness nonuniformity by the some LED device 2 is suppressed. Further, when Example 1 and Example 2 are compared in FIG. 8, luminance unevenness is further suppressed in Example 2 than in Example 1. On the other hand, the illuminance immediately 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. . Examples 1 and 2 can be appropriately selected according to the performance (for example, the degree of luminance unevenness and 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 taken along the line XI-XI in FIG. 12 is a cross-sectional view of the reflector 3a taken along the line XII-XII in FIG. 13 and 14 are enlarged plan views showing a part of the reflector 3a. FIG. 11 also shows a 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. 11 and 12 also show a part of the configuration behind the cross section. In FIG. 12 thru | or FIG. 14, the LED device 2 of the illuminating device 1a is shown collectively.

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 instead of the plurality of first reflecting surfaces 31 shown in FIG. The other structure of the reflector 3a is substantially the same as that of the reflector 3 shown in FIG. 1, and the same reference numerals are given to the corresponding structures in the following description.

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 31 a is the same as the number of the plurality of LED devices 2. As shown in FIG. 13, the plurality of first reflecting surfaces 31 a are respectively disposed around the plurality of LED devices 2. Each of the plurality of first reflection surfaces 31a is a part of an annular concave surface that is substantially centered on the optical axis J1 of the corresponding LED device 2. Specifically, each 1st reflective surface 31a is a pair of site | part located in the both sides of the width direction of the LED device 2 among the said annular concave surfaces. The plurality of first reflection surfaces 31a continuously spread 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 31a can be regarded as a pair of reflection surfaces that continuously spread 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-shaped opening 35a extending in the longitudinal direction is provided at the end of the plurality of first reflecting surfaces 31a on the rear side in the optical axis direction. In the opening 35a, a plurality of openings, each of which is a part of a substantially circular shape, provided at the end on the rear side in the optical axis direction of the plurality of first reflecting surfaces 31a are continuous in the longitudinal direction. The length in the longitudinal direction of the opening 35 a is longer than the length in the longitudinal direction of the LED device row 20. In the reflector 3a, the site | part corresponded to the above-mentioned partition wall 315 (refer FIG. 4) is not provided.

As shown in FIG. 14, the upper edge 311a of each first reflecting surface 31a is a part of an upper circumference 312a that 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 with a two-dot chain line. The upper circumference 312a may be a perfect circle or an ellipse. In the example shown in FIG. 14, the upper edge 311 a of each first reflecting surface 31 a is a part of a true circumference around the optical axis J 1 of the LED device 2. The distance between the centers of the two LED devices 2 adjacent in the longitudinal direction in the longitudinal direction is the sum of the radii in the longitudinal direction of the upper circumferences 312a of the two first reflecting surfaces 31a corresponding to the two LED devices 2. It is as follows. In addition, the center-to-center distance is not more 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 a lower circumference 316a that 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 that connects the upper circumference 312a and the lower circumference 316a. The lower circumference 316a may be a perfect circle or an ellipse. In the example shown in FIG. 14, the lower edge 313 a of each first reflecting surface 31 a is a part of a true circumference centering on the optical axis J 1 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. The upper circumference 312a of each first reflection surface 31a includes the optical axis J1 of the first reflection surface 31a adjacent in the longitudinal direction on the inner side.

The reflector 3a shown in FIG. 9 to FIG. 13 includes a plurality of first reflecting surfaces 31a and second reflecting surfaces 32, substantially the same as the reflector 3 described above. The plurality of first reflecting surfaces 31a are respectively 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 in a line. Each of the plurality of first reflecting surfaces 31a is a part of an annular concave surface. The second reflecting surface 32 is disposed on the front side in the optical axis direction of the plurality of first reflecting surfaces 31a. The second reflecting 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. In the reflector 3a, in each LED cross section, the first reflecting surfaces 31a are arranged on both sides in the width direction of the LED devices 2, and go outward in the width direction from the LED devices 2 toward the front side in the optical axis direction. Moreover, in each LED cross section, the 2nd reflective surface 32 goes to the width direction outward as it goes to the optical axis direction front side.

As described above, in the reflector 3a, by providing the plurality of first reflecting surfaces 31a respectively 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 guide well. In addition, as described above, the second reflecting surface 32 continuously spreads in the longitudinal direction along the plurality of first reflecting surfaces 31a, whereby 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 appropriately diffusing in the longitudinal direction. Thereby, the desired illumination intensity of the illumination light by the illuminating device 1a is realizable, suppressing the brightness nonuniformity by the some LED device 2. FIG.

Further, in the reflector 3a, the plurality of first reflecting surfaces 31a continuously extend 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 enlarged plan views showing a part of the reflector 3b. FIG. 16 also shows the structure other than the reflector 3b of the lighting device 1b. FIG. 16 is also a cross-sectional view of the lighting device 1b. FIG. 16 also shows a part of the configuration behind the cross section. In FIG. 16 thru | or FIG. 18, LED device 2 of the illuminating device 1b is shown collectively.

The reflector 3b includes a plurality of first reflecting surfaces 31b and a pair of second reflecting surfaces 32b instead of the plurality of first reflecting surfaces 31 and the pair of second reflecting surfaces 32 shown in FIG. Each first reflecting surface 31b and the pair of second reflecting surfaces 32b are different in shape from each first reflecting surface 31 and the pair of second reflecting surfaces 32. Further, the number of LED devices 2 in the lighting device 1b is smaller than the number of LED devices 2 in the lighting device 1 described above. The other structure of the reflector 3b and the illuminating device 1b is substantially the same as that of the reflector 3 and the illuminating device 1 described above, and the same reference numerals are given to the corresponding components in the following description.

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

As shown in FIG. 16, in the LED cross section, the first reflecting surfaces 31 b are arranged on both sides in the width direction of the LED device 2 (that is, both the left and right sides in FIG. 16). Further, on both sides of the LED device 2 in the width direction, the first reflecting surface 31b is 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 go outward in the width direction toward the front side in the optical axis direction. The pair of second reflecting surfaces 32 b 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 left second reflective surface 32b and the optical axis J1 is smaller than the angle formed by the right second reflective surface 32b and the optical axis J1. . 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. Smaller than. In other words, at each position in the optical axis direction, the center in the width direction of the pair of second reflecting 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 reflecting surfaces 32b at each position in the optical axis direction is located on a straight line J2. In the following description, the straight line J2 is referred to as “reflection surface axis J2”. The reflective 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 slope of the tangent line of the first reflecting surface 31b at the connection portion (that is, the boundary between the first reflecting surface 31b and the second reflecting surface 32b) between the first reflecting surface 31b and the second reflecting surface 32b. The slope of the tangent line of the second reflecting surface 32b is different. Also in the LED cross sections corresponding to the other LED devices 2, the shape of the first reflecting surface 31b and the shape of the second reflecting surface 32b are the same as the above shapes.

As shown in FIG. 18, the upper edge 311 of each first reflecting surface 31b is a part of an upper circumference 312 that is a virtual circumference surrounding 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 31 b is drawn with a two-dot chain line. The upper circumference 312 may be a true circle or an ellipse. In the example illustrated in FIG. 18, the upper edge 311 of each first reflecting 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 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) corresponds to the two LED devices 2 corresponding to the two LED devices 2. This is not more than the sum of the radii in the longitudinal direction of the upper circumference 312 of the first reflecting surface 31b.

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 spaced apart 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 left second reflecting surface 32b 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 on the LED cross section and is shifted in the width direction from the optical axis J1.

The lower edge 313 of each first reflecting surface 31b is at least a part of a lower circumference that is a virtual circumference centered on the optical axis J1 of the LED device 2. The first reflecting surface 31b is at least a part of an annular concave surface that connects the upper circumference 312 and the lower circumference. The lower circumference may be a true circle or an ellipse. In the example shown in FIGS. 17 and 18, the lower edge 313 of each first reflecting 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 reflecting surface 31b and the center 314 of the upper circumference 312 are located on the reflecting surface axis J2. That is, the reflecting surface axis J2 indicates the center of the first reflecting surface 31b and the second reflecting surface 32b in the LED cross section.

As shown in FIG. 16, the partition wall 315 by the 1st reflective surface 31b is located between each two LED devices 2 adjacent to a longitudinal direction. The partition wall 315 partitions between the two openings 35 adjacent in the longitudinal direction. Between each 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 It is lower than the height in the optical axis direction of other parts of the one reflecting surface 31b.

In the example shown in FIG. 18, the upper circumference 312 of each first reflective surface 31b intersects the upper circumference 312 and the lower edge 313 of the first reflective surface 31b adjacent in the longitudinal direction. Further, the upper circumference 312 of each first reflection surface 31b does not include the optical axis J1 of the first reflection surface 31b adjacent in the longitudinal direction on the inner side. The upper circumference 312 of each first reflection surface 31b may not intersect the upper circumference 312 and the lower edge 313 of the first reflection surface 31b adjacent in the longitudinal direction, for example. Further, the upper circumference 312 of each first reflection surface 31b may include, for example, the optical axis J1 of the first reflection surface 31b adjacent in the longitudinal direction on the inner side.

In the lighting device 1b, the light emitted from the plurality of LED devices 2 is reflected by the plurality of first reflection surfaces 31b or directly forward in the optical axis direction without being reflected by the first reflection surfaces 31b. It is guided. The light guided to the front side in the optical axis direction from the plurality of first reflecting surfaces 31b is reflected by the second reflecting surface 32b or directly without being reflected by the second reflecting surface 32b. The light is guided forward and 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 illuminating device 1b is irradiated with being 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 the plurality of first reflection surfaces 31b and the second reflection surface 32b, as with the reflector 3 described above. The plurality of first reflecting surfaces 31b are respectively 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 in a line. Each of the plurality of first reflecting surfaces 31b is at least a part of an annular concave surface. The second reflecting surface 32b is disposed on the front side in the optical axis direction of the plurality of first reflecting surfaces 31b. The second reflecting surface 32b continuously spreads 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 of the LED device row 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 reflecting surfaces 31b are arranged on both sides in the width direction of each LED device 2, and each LED device 2 From the front toward the front side in the optical axis direction. Moreover, in each LED cross section, the 2nd reflective surface 32b goes to the width direction outward as it goes to the optical axis direction front side. Thereby, like the above-mentioned reflector 3, the desired illumination intensity of the illumination light by the illuminating device 1b is realizable, suppressing the brightness nonuniformity by the some LED device 2. FIG.

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. Thereby, when diffusing the light guided from the plurality of LED devices 2 and the plurality of first reflecting surfaces 31b to the second reflecting surface 32b in the longitudinal direction, the uniformity of light diffusion 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. In addition, the shape of the 2nd reflective surface 32b in a cross section perpendicular | vertical to a longitudinal direction should just be substantially constant over substantially the full length of the longitudinal direction of the 2nd reflective surface 32b. Also in this case, similarly to the above, luminance unevenness due to the plurality of LED devices 2 can be further suppressed.

In the reflector 3b, the upper edge 311 of each first reflecting surface 31b is a part of the upper circumference 312 that is a circumference, and the distance between the centers of the two LED devices 2 adjacent in the longitudinal direction is as follows. It is less than or equal to the sum of the radii in the longitudinal direction of the upper circumference 312 in the two first reflecting surfaces 31b corresponding to the two LED devices 2. Thereby, the space | interval of the longitudinal direction of the some LED device 2 can be made small. As a result, luminance unevenness due to the plurality of LED devices 2 can be further suppressed. Moreover, the reflector 3b and the illuminating device 1b can also be reduced in size.

It should be noted that the upper edge 311 of each first reflecting surface 31b is not necessarily 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. The distance between the centers 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 reflecting surfaces 31b corresponding to the two LED devices 2. By being below, the brightness nonuniformity by the some LED device 2 can be suppressed further similarly to the above. Moreover, the reflector 3b and the illuminating device 1b can also be reduced in size.

In the reflector 3b, the upper edge 311 of each first reflecting surface 31b is at least part of an elliptical circumference that is long in the width direction. Thereby, the spread to the width direction of the light from each LED device 2 can be enlarged. As a result, the difference between the spread in the longitudinal direction of the illumination light from the illumination device 1b 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 that is a circumference, and the optical axis J1 of each LED device 2 is It is located between the center 314 of the upper circumference 312 of the first reflective surface 31b and the second reflective surface 32b. Thereby, the light from the several LED device 2 can be guide | induced to the optical axis direction front, biasing to the one side of the width direction of the illuminating device 1b. As a result, in a metal processing apparatus or the like provided with the lighting device 1b, the degree of freedom of arrangement of 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 that is a 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. Thereby, the light from the several LED device 2 can be efficiently guide | induced to the direction substantially parallel to an 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 disposed 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 is directed outward in the width direction toward the front side in the optical axis direction. Thereby, 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 further appropriately diffusing in the longitudinal direction. As a result, it is possible to easily achieve the desired illuminance of the illumination light by the illumination device 1b while further suppressing uneven brightness 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 distance between the other second reflection surface 32b and the optical axis J1. Greater than distance. Thereby, the light from the several LED device 2 can be guide | induced to an optical axis direction front, biasing suitably to the one side of the width direction of the illuminating device 1b.

FIG. 19 is an enlarged plan view showing a part of another preferred 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 in the width direction from the optical axis J1 of the LED device 2, but is 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 and one side in the longitudinal direction of the illumination device 1c. In the example shown in FIG. 19, the center 314 of the upper circumference 312 of the first reflecting surface 31 c is closer to the end of the lighting device 1 c in the longitudinal direction than the optical axis J1 of the LED device 2. Thereby, the light from the LED device 2 can be spread toward the end in the longitudinal direction (that is, in a 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 spaced apart from the optical axis J1 in the longitudinal direction is not necessarily provided at the end in the longitudinal direction, and is provided in another part. May be. Or all the 1st reflective surfaces of reflector 3c may be the above-mentioned 1st reflective surface 31c. In other words, in the reflector 3c, the center 314 of the upper circumference 312 of at least some of the first reflecting surfaces 31c among the plurality of first reflecting surfaces is spaced apart 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 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 reflection 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 having the 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 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 illumination device 1d. As a result, in a metal processing apparatus or the like provided with the lighting device 1d, the degree of freedom of arrangement of 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 in the width direction of the pair of second reflecting surfaces 32b are compared to the example shown in FIG. 2 away from the second optical axis J1 in the width direction. Thereby, the light from the several LED device 2 can be largely biased to the one side of the width direction of the illuminating device 1d.

Various changes can be made in the above-described

lighting devices

1, 1a to 1d and

reflectors

3, 3a to 3d.

For example, in the

reflectors

3 and 3a, the height in the optical axis direction of the pair of second reflecting surfaces 32 may be smaller than the height in the optical axis direction of each of the plurality of first reflecting

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 need to be substantially constant over the entire length in the longitudinal direction, and may be changed depending on the position in the longitudinal direction. On each of the second reflecting surfaces 32, a plurality of partition walls 315 (see FIG. 4) of the first reflecting surfaces 31 may be extended. Specifically, the end in the width direction of the partition wall 315 may extend upward along the second reflecting surface 32 as, for example, a substantially triangular pyramid 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 array 20. The same applies to the reflectors 3b to 3d.

In the LED cross section of the reflector 3, for example, the angle formed between the tangent line of the first reflecting surface 31 and the optical axis J1 in the connecting portion between the first reflecting surface 31 and the second reflecting surface 32 is the second reflecting surface in the connecting portion. The angle may be smaller than or equal to the angle formed by the tangent line 32 and the optical axis J1. Further, in the LED cross section of the reflector 3a, the angle formed between the tangent line of the first reflecting surface 31a and the optical axis J1 in the connecting portion between the first reflecting surface 31a and the second reflecting surface 32, and the second reflecting surface in the connecting portion. The angle formed by the tangent line 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 are not necessarily arranged linearly, but may be arranged linearly (that is, non-annular). For example, the plurality of LED devices 2 and the plurality of first reflection surfaces 31 and 31a may be arranged in an arc (that is, arranged along a virtual arcuate 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 one 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 1st reflective surface row | line | column 310 is the some 1st reflective surface 31 (refer FIG. 4) arranged substantially parallel to a longitudinal direction. The two first reflecting surface rows 310 are disposed 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 respectively oppose the pair of second reflecting surfaces 32 in the width direction. The fourth reflecting surface 36 is disposed 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 in the optical axis direction of the fourth reflective surface 36 is on the rear side in the optical axis direction with respect to the front end in the optical axis direction of the second reflective surface 32.

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 disposed 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 each two first reflecting surface rows 310 adjacent in the width direction. Also in the reflectors 3e and 3f shown in FIGS. 22 and 23, the desired illuminance of the illumination light by the illumination device can be realized while suppressing the luminance unevenness due to the plurality of LED devices 2 as described above.

In the reflector 3b shown in FIG. 15, only the center 314 of the upper circumference 312 of some of the first reflecting surfaces 31b among the plurality of first reflecting surfaces 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 they do not contradict each other.

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

DESCRIPTION OF

SYMBOLS

1,1a-1d Illuminating device 2

LED device

3,3a-3f Reflector 20 LED device row | line | column 21 Light-emitting

surface

31,31a-31d 1st

reflective surface

32,32b, 32d 2nd reflective surface 311,311a (1st reflective surface )

Upper edge

312, 312a Upper circumference J1 Optical axis

Claims

A reflector for a lighting device,
A plurality of first reflecting surfaces which are respectively 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 in a line, each being at least a part of an annular concave surface When,
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, arranged on the one side of the LED device row. A second reflecting surface continuously spreading in the longitudinal direction,
With
In each LED cross section perpendicular to the longitudinal direction and including the optical axis of each LED device, a first reflecting surface is disposed on both sides in the width direction of each LED device, and the front side in the optical axis direction from each LED device Toward the outside in the width direction as
In each LED cross section, the second reflecting surface goes outward in the width direction as it goes to the front side in the optical axis direction.
The reflector according to claim 1,
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 reflecting surface is at least part of the upper circumference that 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 in the longitudinal direction of the upper circumference in the two first reflecting surfaces corresponding to the two LED devices. is there.
The reflector according to any one of claims 1 to 3,
The upper edge of each first reflecting surface is at least part of an elliptical circumference that is long in the width direction.
The reflector according to any one of claims 1 to 4, comprising:
The upper edge of each first reflecting surface is at least part of the upper circumference that is the circumference,
The center of the upper circumference of each first reflective surface is located on the optical axis of each LED device.
The reflector according to any one of claims 1 to 4, comprising:
The upper edge of each first reflecting surface is at least part of the upper circumference that is the circumference,
The optical axis of each LED device is located between the center of the upper circumference of each first reflective surface and the second reflective surface in the width direction.
The reflector according to claim 6,
The center of the upper circumference of at least some of the plurality of first reflecting surfaces is spaced from the optical axis of the LED device in the longitudinal direction.
The reflector according to any one of claims 1 to 7,
Further comprising another second reflecting surface arranged on the front side in the optical axis direction of the plurality of first reflecting surfaces and continuously spreading in the longitudinal direction on the other side in the width direction of the LED device row,
In each LED cross section, the other second reflecting 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;
Is provided.