WO2013128694A1

WO2013128694A1 - Lighting device

Info

Publication number: WO2013128694A1
Application number: PCT/JP2012/073565
Authority: WO
Inventors: 久保田　秀直; 西中　祐三; 大内　敏; 横山　淳一; 津村　誠; 克行渡辺; 益岡　信夫
Original assignee: 日立コンシューマエレクトロニクス株式会社
Priority date: 2012-02-29
Filing date: 2012-09-14
Publication date: 2013-09-06
Also published as: JP2013211245A

Abstract

The present invention provides a lighting device that is lightweight and that can easily and inexpensively be increased in size. The lighting device of the present invention is provided with LEDs that serve as light-emitting elements, and is characterized by the provision of: a base chassis provided with an opening in the illumination direction; an LED substrate that is mounted on the base chassis; a plurality of LEDs that are mounted on the LED substrate so as to emit light in a direction that is parallel to the LED substrate; a diffusion plate that is arranged in the opening of the base chassis and that has a function of propagating light in a direction that is parallel to the light emission direction of the LEDs; and a diffusion cover that is arranged at a predetermined distance from the diffusion plate.

Description

Lighting device

The present invention relates to, for example, a backlight for a liquid crystal display device and an illumination device used for illumination in a room (a room such as a house, a public facility, or an elevator cage).

As a background art in this technical field, the one described in Patent Document 1 is known. In this publication, “a diffusion plate attached to an opening surface, a light guide plate attached to a bottom surface opposite to the opening surface, an inner wall surface to which a reflection film is attached, and a reflection film is attached to the bottom surface. And a display body characterized in that an LED light source is provided in the vicinity of a side surface end of the light guide plate ”(see summary).

JP 2010-199012 A

When using a technique for disposing LEDs on the side surface of a light guide plate as described in Patent Document 1 for a large-sized lighting device, it is necessary to consider the weight of the light guide plate. Since the light guide plate serves as the irradiation surface of the lighting device, it is necessary to use a light guide plate having an outer shape substantially the same as the irradiation surface. In addition, it is difficult to make the light guide plate thin because light emitted from the LEDs must be incident from the side surface of the light guide plate. Therefore, when the size of the lighting device is increased and the light emitting area is increased, the weight of the light guide plate is increased accordingly. When the weight of the light guide plate increases, the housing of the lighting device that holds the light guide plate must also be strong. Therefore, when the illuminating device is increased in size, there is a problem that the weight of the entire device increases, and accordingly, the component cost increases as a whole.

Also, when the irradiation area of the light guide plate is increased, it is necessary to increase the amount of incident light in order to secure a desired luminance. For example, if the irradiation area is doubled, the amount of light incident on the light guide plate needs to be doubled to ensure the same luminance. However, when the irradiation area is doubled, the length of the side surface is about 1.4 times, so the number of LEDs can only be increased to 1.4 times. As described above, since the maximum number of LEDs that can be arranged is determined depending on the size of the light guide plate, there is a problem in that there is a limit to increasing the size of the light guide plate.

In order to solve the above problems, for example, the configuration described in the claims is adopted.
The present invention includes a plurality of configurations that solve the above-described problems. To give an example, the illumination device irradiates light from an LED as a light source as illumination light, and is opened in the irradiation direction of the illumination light. A base chassis provided with the LED, an LED board mounted on the base chassis on which the LEDs are mounted, and the LED disposed at a predetermined distance from the LED board at an opening of the base chassis. A diffusion plate for diffusing the light from the LED and the light reflected by the LED substrate and / or the base chassis, and further diffusing the light from the diffusion plate disposed at a predetermined distance from the diffusion plate And a diffusion cover as an exterior of the lighting device,
The LED is attached to the LED substrate so as to emit light in a direction perpendicular to the irradiation direction and parallel to the LED substrate, and the diffuser plate has a light emitting direction of the LED. It has a function of propagating or guiding light in parallel directions.

According to the present invention, it is possible to provide a lighting device having a configuration that can easily cope with an increase in size at a low weight and at a low cost.

It is sectional drawing of the illuminating device of Example 1. FIG. It is the top view which looked at the light source block of the state which removed the diffusion plate from the Z direction. FIG. 3 is a diagram illustrating a configuration of a diffusion plate 20 according to the first embodiment, and is a diagram illustrating light propagation by the diffusion plate 20. It is the figure which looked at the diffusion plate of the peripheral part of LED from the Z direction. It is a figure which shows the result of having simulated the luminance distribution of the light radiate | emitted in the Z direction in the YZ plane passing through the light emission center of LED. It is sectional drawing of the illuminating device of Example 2. FIG. It is sectional drawing of the illuminating device of Example 3. FIG. It is sectional drawing of the illuminating device of Example 4. FIG. It is the top view which looked at the light source block of the state which removed the diffusion plate from the Z direction. It is sectional drawing of the illuminating device of Example 5. FIG. It is the top view which looked at the light source block of the state which removed the diffusion plate from the Z direction. It is sectional drawing of the illuminating device of Example 6. FIG. It is the top view which looked at the light source block of the state which removed the diffusion plate from the Z direction. It is the figure which looked at the diffusion plate of the peripheral part of LED from the Z direction. It is sectional drawing of the illuminating device of Example 7. FIG. It is sectional drawing of the illuminating device of Example 8. It is sectional drawing of the illuminating device of Example 9. FIG. It is sectional drawing of the illuminating device of Example 10. FIG. It is the top view which looked at the light source block which concerns on Example 10 from the Z direction in the state which removed the diffusion plate. It is a figure which shows the circuit structure or connection structure of the LED row which concerns on Example 11. FIG. It is a figure which shows the other example of the circuit structure of LED row which concerns on Example 11, or a connection structure. It is a figure which shows the structure of the diffusion plate 21 which concerns on Example 12, Comprising: It is a figure which shows the propagation of the light by the diffusion plate 21. FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, among the appearing nuclear components, those having the same function or action are denoted by the same reference numerals, and redundant description will be omitted.

First, Embodiment 1 of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view of a lighting device 100 according to an embodiment of the present invention.

The illumination device 100 includes a light source block 200 and a housing 300 that is an exterior. FIG. 1 shows a state in which the lighting device 100 is attached to a ceiling or the like (not shown), and irradiates illumination light in the Z direction (downward). That is, the Z direction is the irradiation direction of the illumination light of the illumination device (the illumination light from the illumination device is diffused and irradiated in various directions, but here the Z direction is the irradiation direction). The housing 300 includes a case 70 made of, for example, a resin having an opening in the Z direction, and a light diffusing cover 60 that is fixed and held in the opening. That is, the case 70 and the diffusion cover 60 constitute a housing 300 that is an exterior of the lighting device. The light source block 200 is disposed inside the housing 300 and is fixed to the case 70 by, for example, screwing. The diffusion cover 60 is formed of, for example, a member obtained by mixing a diffusible bead in a transparent resin, or a member obtained by roughening the surface of the transparent resin. A predetermined distance (space) from 20 is provided. The light emitted from the light source block 200 is diffused when passing through the diffusion cover 60 and is emitted to the outside of the illumination device 100.

The light source block 200 includes a base chassis 10, a light diffusing plate 20, a light emitting diode (LED) 30 as a light source, and an LED substrate 40. Similar to the diffusion cover 60, the diffusion plate 20 is formed of, for example, a member obtained by mixing a diffusible bead in a transparent resin, or a member obtained by roughening the surface of the transparent resin. Are spaced apart from each other by a predetermined distance (space). The base chassis 10 has an opening in the Z direction and has a box shape, a bowl shape, or a tray shape whose opening area increases in accordance with the irradiation direction, and serves as a housing of the light source block 200. Further, the diffusion plate 20 is arranged so as to cover the opening of the base chassis 10. The diffusion plate 20 is attached with, for example, an adhesive or a double-sided tape so as to be coupled to the four sides (edges) on the opening side of the base chassis 10. The LED substrate 40 is fixed to the base chassis 10 by, for example, screwing.

The LED 30 is a side-view type LED that emits light in a direction parallel to the electrode surface, for example, and emits white, daylight, or light bulb color light as illumination light. The LED 30 may be an LED that emits white light with a high color temperature (for example, 7000 ° C. to 9000 ° C.), and the diffusing cover 60 may be colored so that the illumination light has a daylight color or a light bulb color. Many LEDs 30 are attached to the LED substrate 40 so as to protrude in the Z direction. Further, the mounting direction of the LED 30 is determined so as to emit strong illumination light in a direction (Y direction) that is orthogonal to the light irradiation direction (Z direction) of the lighting device and parallel to the LED substrate 40. That is, in this embodiment, the optical axis of the LED 30 is parallel to the Y direction. A light shielding pattern 90 to be described later is provided in the vicinity of the LED 30 of the diffusion plate 20.

In addition, the outer peripheral part of the base chassis 10 stands up diagonally as shown in the figure, and the light leaking to the outer peripheral part of the base chassis 10 is reflected in the Z direction to improve the luminance. At this time, the inner surface of the base chassis 10 is subjected to, for example, white coating to increase the reflectance. Instead of this, a reflective sheet may be attached to the inner surface of the base chassis 10. Further, the base chassis 10 may be made of a metal such as aluminum or resin so as to make it easy to dissipate the heat generated by the LEDs 30.

FIG. 2 is a plan view of the light source block 200 with the diffusion plate 20 removed, as viewed from the Z direction. The broken line arrow shown in FIG. 2 is the light emission direction from the LED 30, and is parallel to the Y direction as shown in FIG. The LEDs 30-1, LED 30-2, LED 30-3, and LED 30-4 are arranged with the light emission direction of the LEDs 30 in the same direction. The LED 30-1, LED 30-2, LED 30-3, and LED 30-4 are similarly arranged in the X direction. That is, in this embodiment, a plurality of LEDs 30 having the same light emission direction are arranged in a plurality (6 in the example of FIG. 2) in the X direction orthogonal to the light emission direction of the LEDs 30. A plurality of arrays (four rows in the example of FIG. 2) are arranged at predetermined intervals in the Y direction. Of course, the number of LEDs in the X direction and the number of LED rows in the Y direction are not limited to this.

The LED 30-1 is provided in the leftmost lighting block 80-1. Similarly, the LED 30-2 is provided in the next lighting block 80-2, and the LED 30-3 is provided in the next lighting block 80-3. The LED 30-4 is provided in the illumination block 80-4 at the next stage. Further, as shown in FIG. 1, light blocking patterns 90-1 to 90-4 described later are provided on the lower surface (light emitting surface) of the diffusion plate 20 in each of the illumination blocks 80-1 to 80-4. Here, the illumination block 80 includes one LED row (eg, LED 30-1 row), a space from this LED row to the next LED row (eg, LED 30-2 row), and a diffusion plate corresponding to the space. It is assumed that 20 regions and a light shielding pattern 90 provided in the regions are included. Moreover, since the LED 30 mounting surface of the LED substrate 40 is used as a reflection surface for light propagation, the LED substrate 40 may be a white substrate having a high reflectance. Alternatively, the LED 30 mounting surface side of the LED substrate 40 may be white coated to increase the reflectance. Instead of white coating, a reflective sheet may be provided on the LED 30 mounting surface of the LED substrate 40.

Next, the light propagation of the LED 30 will be described. FIG. 3A is a cross-sectional view of one illumination block 80 viewed from the X direction, ie, a cross-sectional view in the YZ plane, for explaining the propagation of light. The light emitted from the LED 30 is propagated in the Y direction while being emitted from the diffusion plate 20 while reflecting and diffusing the space between the diffusion plate 20 and the LED substrate 40. FIG. 3B is a cross-sectional view viewed from the Y direction, that is, a cross-sectional view of the XZ plane. As shown in the figure, the diffuser plate 20 has convex portions and concave portions (prisms) having a triangular cross section in the X direction on the LED 30 (on the Z direction) side (light incident surface). The plurality of triangular convex portions and concave portions are arranged in the X direction and are formed to extend in the Y direction. Thus, the light emitted from the LED 30 is propagated in the Y direction while being reflected in the triangular recess. That is, the diffusing plate 20 according to the present embodiment has a light diffusing function and also has a function of propagating or guiding light in the Y direction (light emitting direction of the LED 30, that is, the optical axis direction of the LED 30). In the present embodiment, the function of propagating or guiding light is performed by triangular irregularities, but other configurations may be used.

In addition, in the position corresponding to the light emitting side vicinity of LED30 directly under LED30 of the diffusing plate 20, the light concentrates locally, and the part (henceforth called a hot spot) where the brightness | luminance is spot-like arises. This causes uneven brightness. In order to reduce such hot spots, in this embodiment, as shown in FIG. 3, a light shielding pattern 90 is provided on the exit surface side of the diffusion plate 2.

FIG. 4 is a view of the peripheral portion of the LED 30 when the diffusion plate 20 is viewed from the lower side in the Z direction. As shown in FIG. 4A, the light shielding pattern 90 according to the present embodiment is made of, for example, white ink, and the white ink is applied to the lower surface side (that is, the light emitting surface side) of the diffusion plate 20 ( The light shielding pattern 90 is provided on the lower surface side of the diffusion plate 20 by printing. Thus, the light intensity of the hot spot is reduced by blocking or reducing the light directed from the diffusion plate 20 in the Z direction (downward) by reflection or absorption. The ink used for the light shielding pattern 90 is not limited to white, but may be black ink or blue ink mixed in white ink, for example. In addition, the shape of the light shielding pattern 90 may have a protrusion extending radially around the LED 30 as shown in FIG. Here, it is assumed that the protrusion on the side corresponding to the light emitting direction of the LED 30 is longer than the protrusion corresponding to the back surface (the surface opposite to the light emitting surface) of the LED 30. Further, as shown in FIG. 4B, it may be circular, elliptical, or oval. In any case, the light shielding pattern 90 may be any shape and size that covers a predetermined area immediately below the LED 30 and in the vicinity of the emission surface, and the shape is not limited to the above example.

In the above, an example in which the light is directly printed on the diffusion plate 20 is shown. However, for example, a transparent film on which the light shielding pattern 90 is printed is attached to the diffusion plate 20 so that the light shielding pattern 90 corresponds to the LED 30 in position. The structure to attach may be sufficient. Further, as shown in FIG. 4B, a strip-shaped light shielding pattern 90 ′ in which the width between the adjacent LEDs 30 is reduced and the width of the LEDs 30 is increased is attached to the diffusion plate 20 by a sheet having light shielding properties. It is good also as a structure.

Further, in this embodiment, a diffusion cover 60 having a diffusion function is disposed at a position separated from the diffusion plate 20 by a predetermined distance H1. This distance H1 is a distance from the surface (light emitting surface) of the diffusing plate 20 to the inner surface (light incident surface) of the diffusing cover 60. For example, the thickness of the light source block (from the back surface of the base chassis 10 to the light of the diffusing plate 20). The distance to the incident surface is about 0.5 to 2 times. However, the present invention is not limited to this. By using the diffusion plate 2 and the diffusion cover 60 to diffuse the light from the LED 30 in two stages, the luminance of the lighting device 100 is made uniform.

FIG. 5 is a diagram showing a result of simulating the luminance distribution of light emitted in the Z direction on the YZ plane passing through the light emission center of the LED 30. The horizontal axis represents the traveling direction (Y direction) of the light emitted from the LED light source, and the vertical axis represents the luminance (logarithm). In FIG. 5, L <b> 1 indicates the luminance value emitted from the diffusion plate 20 when there is no light shielding pattern 90. A luminance value peak P1 is formed in the vicinity of the LED 30-1, and the luminance decreases as the distance from the LED 30-1 increases. In the vicinity of the LED 30-1, since direct light from the LED 30-1 and reflected light from the LED substrate 40 are strong, the brightness is locally high (hot spot). In order to suppress the hot spot in the vicinity of the LED 30-1, a light shielding pattern 90 is provided on the diffusion plate 20 in the vicinity of the LED 30-1. L2 indicates the luminance value when the light shielding pattern 90 is present. As shown in the drawing, the peak P1 is suppressed by the light shielding pattern 90, and the light reflected by the light shielding pattern 90 is further propagated in the Y direction, so that the luminance value of the other part is increased. L3 represents the luminance value emitted from the diffusion cover 60. As shown in the drawing, the luminance unevenness in the diffusion plate 20 is reduced by the diffusion cover 60, and the luminance can be made uniform.

When the lighting device according to the present embodiment is used for room lighting, some luminance non-uniformity is allowed in the room lighting. Therefore, if the luminance is uniformed to some extent by the diffusion plate 2 and the diffusion cover 60, The light-shielding pattern 90 that has been made may not be provided.

As described above, in this embodiment, since light is propagated in the air layer between the diffusion plate 20 and the LED substrate 40, the weight can be reduced without using a light guide plate. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased.

In the above-described embodiment, for example, light from all the lighting blocks 80 is turned on or off according to a user instruction. However, any one to three of the lighting blocks 80-1 to 80-4 may be individually turned on or off. For example, when the room is bright and the user does not request high illumination brightness, one of the illumination blocks 80-1 to 80-4 (for example, 80-) is selected in response to a user instruction (for example, “partial lighting” instruction). 2 only) or two (for example, only 80-2 and 3) bright blocks may be turned on and the remaining blocks may be turned off. When the room is dark, for example, the user may turn on all of the lighting blocks 80-1 to 80-4 by instructing “all lighting”.

Further, each of the illumination blocks 80-1 to 80-4 is divided into, for example, two LEDs 30 and divided into three areas (in the example of FIG. 2, divided into three areas), and each of these areas is turned on or off individually. You may let them.

Furthermore, not only lighting / extinguishing, but also all or each of the lighting blocks 80-1 to 80-4 may have a dimming function, and the illumination light from all or each of the lighting blocks 80 may be provided according to a user instruction. The strength may be adjusted.

Next, Embodiment 2 of the present invention will be described with reference to FIG. FIG. 6 is a cross-sectional view of the illumination device 101 according to the second embodiment of the present invention. In the light source block 201 used in the lighting device 101 of the second embodiment, the LED substrate 41 is fixed to the base chassis 10 by, for example, screwing, as in the first embodiment. Many LEDs 30 are attached to the LED substrate 41 so as to protrude in the Z direction, and the light emitting direction is parallel to the Y direction. The light emission direction of the LEDs 30-1 and 30-2 provided in the leftmost illumination block 80-1 and the illumination block 80-2 in the next stage is the + side in the Y direction as in the first embodiment. It is. The light emission direction of the next-stage illumination block 80-3 and the LED 30-3 and LED 30-4 provided in the next-stage illumination block 80-4 is the direction opposite to that in the first embodiment. The negative side. That is, in this embodiment, the light emitting directions of the left and right LEDs are opposed to each other so that the light emitting direction of the left and right LEDs faces the center in the Y direction of the lighting device with reference to the center in the Y direction (direction parallel to the light emitting direction) of the lighting device. It is what.

The LED 30-1, LED 30-2, LED 30-3, and LED 30-4 are similarly arranged in the X direction. As the LED substrate 41, a white substrate having a high reflectance may be used similarly to the LED substrate 40 of the first embodiment. Alternatively, the LED 30 mounting surface side of the LED substrate 41 may be white coated to increase the reflectance. Instead of this, a reflective sheet may be provided on the LED 30 mounting surface of the LED substrate 40. The light shielding pattern 90 provided on the diffusing plate 20 is also matched with the position of the LED 30 and the light emitting direction.

In the above description, the case where the illumination block 80 has four stages has been described. However, in the case of six stages, the light emission direction of the LEDs 30 arranged in the left three stages is arranged in the Y direction + side and the right three stages. The light emission direction of the LED 30 may be the Y direction minus side. When the number of the illumination blocks 80 is an odd number, the light emission direction of the LED 30 at the center stage may be either.

Since the housing 300 including the diffusion cover 60 and the case 70 is the same as the lighting device 100 of the first embodiment, description thereof is omitted.

In the first embodiment described above, since the light from all the LED rows is emitted from the left to the right, the amount of light supplied to the rightmost illumination block 80-4 is integrated by the light of the LEDs 30-1 to 4 rows. By doing so, it becomes the largest among the lighting blocks. As a result, in Example 1, the luminance of light from the right illumination block (80-3, 4) is relatively higher than the luminance of light from the left illumination block (80-1, 2). The luminance distribution viewed from the irradiation surface side of the illuminating device becomes asymmetrical, and the brightness of the illumination light is biased. On the other hand, according to the configuration of Example 2, since the light from the left and right LED rows is emitted toward the center of the lighting device, the luminance distribution viewed from the irradiation surface side of the lighting device is most at the center in the Y direction. Bright and symmetrical. That is, according to the configuration of the second embodiment, a more preferable luminance distribution can be obtained in the lighting device.

As described above, in the lighting device 101 according to the second embodiment, light is propagated in the air layer between the diffusion plate 20 and the LED substrate 41 as in the lighting device 100 according to the first embodiment. The weight can be reduced without using. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. In addition, since the LED 30 is arranged as a target with respect to the XZ plane including the center of the light source block 201, the luminance unevenness is also targeted based on the center in the Y direction. is there. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, Embodiment 3 of the present invention will be described with reference to FIG. FIG. 7 is a cross-sectional view of the illumination device 102 according to the third embodiment of the present invention. In the light source block 202 used in the illumination device 102 according to the third embodiment, the LED substrate 42 is fixed to the base chassis 10 by, for example, screwing as in the first embodiment. Many LEDs 30 are attached to the LED substrate 42 so as to protrude in the Z direction, and the light emission direction is parallel to the Y direction.

The light emission direction of the LEDs 30-1 and 30-2 provided in the leftmost illumination block 80-1 and the illumination block 80-2 in the next stage is the Y direction opposite to that in the first embodiment. -Side. The light emission direction of the next-stage illumination block 80-3 and the LED 30-3 and LED 30-4 provided in the next-stage illumination block 80-4 is the + side in the Y direction as in the first embodiment. It is. The LED 30-1, LED 30-2, LED 30-3, and LED 30-4 are similarly arranged in the X direction. That is, in this embodiment, contrary to the second embodiment, the light emission direction of the left and right LEDs is set to the left and right end portions of the illumination device with reference to the center in the Y direction (direction parallel to the light emission direction) of the illumination device. They are made to be opposite to each other so as to face the side (outside).

The LED substrate 42 may be a white substrate having a high reflectance, similar to the LED substrate 40 of the first embodiment. Alternatively, the LED 30 mounting surface side of the LED substrate 42 may be white coated to increase the reflectance. Instead of this, a reflective sheet may be provided on the LED 30 mounting surface of the LED substrate 40. The light shielding pattern 90 provided on the diffusion plate 20 is also matched with the LED 30 position and the light emission direction.

According to the configuration of the third embodiment, as in the second embodiment, the luminance distribution viewed from the irradiation surface side of the lighting device is symmetrical. Further, in this embodiment, since the LED rows are arranged in the center of the two rows, the brightness of the hot spot on the center side becomes the highest, and therefore the brightness on the center side of the illumination device is also increased in this embodiment 3. be able to.

In the above description, the case where the illumination block 80 has four stages has been described, but in the case of six stages, the light emission direction of the LEDs 30 arranged in the left three stages is arranged in the Y direction-side and the right three stages. The light emission direction of the LED 30 may be the Y direction + side. When the number of the illumination blocks 80 is an odd number, the light emission direction of the LED 30 at the center stage may be either.

As described above, in the lighting device 102 according to the third embodiment, light is propagated in the air layer between the diffusion plate 20 and the LED substrate 42 as in the lighting device 100 according to the first embodiment. The weight can be reduced without using. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. In addition, since the LEDs 30 are arranged for the XZ plane including the center of the light source block 201, the luminance unevenness is also targeted in the Y direction, so that the luminance unevenness is difficult to recognize as in the second embodiment. There is also an effect. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, a fourth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is a cross-sectional view of the illumination device 103 according to the fourth embodiment of the present invention. FIG. 9: is the top view which looked at the light source block 203 of the state which removed the diffuser plate 20 from the Z direction about the illuminating device 103 which concerns on Example 4. FIG. In the present embodiment, unlike the first to third embodiments, different LED substrates 43-1 to 4-4 are used for the LEDs 30-1 to 30, respectively.

In the light source block 203 used in the illumination device 103 of the fourth embodiment, the LED substrate 43 is fixed to the base chassis 10 by, for example, screwing as in the first embodiment. The leftmost illumination block 80-1 is provided with an LED substrate 43-1, and a large number of LEDs 30-1 are attached to the LED substrate 43-1 so as to protrude in the Z direction. Similarly, the LED block 43-2 is provided in the illumination block 80-2 at the next stage, and a large number of LEDs 30-2 are attached to the LED substrate 43-2 so as to protrude in the Z direction. The same applies to the illumination block 80-3 and the illumination block 80-4. The light emission direction of the LEDs 30 is all on the + side of the Y direction as in the first embodiment. The light emitted from the LED 30 is propagated in the Y direction while being emitted from the diffusion plate 20 while reflecting and diffusing the space between the diffusion plate 20 and the base chassis 10. As in the first embodiment, the inner surface of the base chassis 10 is coated with, for example, white paint to increase the reflectance. Further, a reflection sheet may be laid on the entire inner surface of the bottom surface (the surface facing the LED substrate 43) of the base chassis 10, and the LED substrates 43-1 to 4-4 may be disposed thereon. At this time, the LED substrates 43-1 to 4-4 may be provided with a reflection sheet so as to cover the LED mounting surface, or may be coated with white.

In Examples 1 to 3 described above, all the LEDs 30 to 1 to 4 are mounted on one LED substrate 40. However, in this example, each of the LEDs 30 to 1 to 4 is physically divided. It is mounted on LED boards 43-1-4. As shown in FIG. 9, the LED substrates 43-1 to 4-4 have a long and narrow rectangular shape with the X direction as the longitudinal direction, and the width (dimension in the Y direction) is slightly larger than the width of the LED 30. Compared to the LED substrate 40 of Example 1, the area is sufficiently small. Each width dimension of the LED substrate 43 is, for example, about 1 to 10 cm, but is not limited thereto. If such an LED substrate 43 is used, the cost and weight of the LED substrate can be reduced, and thus the cost and weight of the lighting device can be reduced.

As described above, in this embodiment, since light is propagated in the air layer between the diffusion plate 20 and the base chassis 10, the weight can be reduced without using a light guide plate. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. Furthermore, since the area of the LED substrate 43 can be reduced, the corresponding weight can be reduced. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 10 is a cross-sectional view of the lighting device 104 according to the fifth embodiment of the present invention. FIG. 11: is the top view which looked at the light source block 204 of the state which removed the diffusion plate 20 from the Z direction about the illuminating device 104 which concerns on Example 5. FIG.

In the light source block 204 used in the illumination device 104 of the fifth embodiment, the LED substrate 44 is fixed to the base chassis 10 by, for example, screwing as in the first embodiment. Many LEDs 30-1 and 30-2 arranged in the leftmost illumination block 80-1 and the next illumination block 80-2 are attached to the LED board 44-1 so as to protrude in the Z direction. . A large number of LEDs 30-3 and LEDs 30-4 arranged in the illumination block 80-3 and the next-stage illumination block 80-4 are attached to the LED substrate 44-2 so as to protrude in the Z direction. The light emission direction of the odd-numbered blocks LED 30-1 and LED 30-3 is the Y direction minus side, and the light emission direction of the even-numbered blocks LED 30-2 and LED 30-4 is the Y direction plus side. That is, in the present embodiment, the LED array group is configured by arranging the LED arrays in close proximity to each other so that the back surfaces of the two LED arrays that emit light in opposite directions face each other, and the Y direction of the illumination device (parallel to the light output direction). The LED rows are arranged symmetrically with respect to the center of the direction. The spacing between the LED rows in each LED row group (the spacing between the back surfaces of the LEDs 30) is about 0.5 to 3 times the width of the LED (dimension in the Y direction), but is not limited to this. Absent. Separate LED substrates 44-1 and 44-2 are used for each LED array group. The LED substrates 44-1 and 2 are elongated ones with the X direction as the longitudinal direction as in the fourth embodiment. However, since two LED rows are mounted on one LED substrate 44, the width dimension of the LED substrate 44 is larger than that of the fourth embodiment.

The light emitted from the LED 30 is propagated in the Y direction while being emitted from the diffusion plate 20 while reflecting and diffusing the space between the diffusion plate 20 and the base chassis 10 as in the fourth embodiment. As in the first embodiment, the inner surface of the base chassis 10 is coated with, for example, white paint to increase the reflectance. Further, a reflection sheet may be laid on the inner front surface of the bottom surface (the surface facing the LED substrate 44) of the base chassis 10, and the LED substrates 44-1 and 4-2 may be disposed thereon. At this time, a reflective sheet may be provided on the LED substrates 44-1 and 2-2 so as to cover the LED mounting surface, or white coating may be applied.

According to the configuration of the fifth embodiment, the luminance distribution viewed from the irradiation surface side of the illumination device is symmetrical as in the second and third embodiments. Further, since the LEDs 30-2 and 30-3 face each other in the center of the lighting device, the luminance on the center side of the lighting device can be increased also in the fifth embodiment.

As described above, in this embodiment, since light is propagated in the air layer between the diffusion plate 20 and the base chassis 10, the weight can be reduced without using a light guide plate. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. Furthermore, since the area of the LED substrate 44 can be reduced, the weight can be reduced accordingly. Furthermore, since the number of LED boards 44 can be reduced as compared with the fourth embodiment, the wiring with the LED boards 44 and its connectors (not shown) can be reduced, so that the cost can be reduced. Can do. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, a sixth embodiment of the present invention will be described with reference to FIGS. FIG. 12 is a cross-sectional view of the illumination device 105 according to the sixth embodiment of the present invention. FIG. 13: is the top view which looked at the light source block 205 of the state which removed the diffuser plate 20 from the Z direction about the illuminating device 105 which concerns on Example 6. FIG.

In the light source block 205 used in the illumination device 105 of the sixth embodiment, the LED substrate 45 is fixed to the base chassis 10 by, for example, screwing as in the first embodiment. Many LEDs 30-1 and 30-2 arranged in the leftmost illumination block 80-1 and the next illumination block 80-2 are attached to the LED board 45-1 so as to protrude in the Z direction. . A large number of LEDs 30-3 and LEDs 30-4 disposed in the illumination block 80-3 and the next-stage illumination block 80-4 are attached to the LED substrate 45-2 so as to protrude in the Z direction. The light emission direction of the odd-numbered blocks LED 30-1 and LED 30-3 is the Y direction minus side, and the light emission direction of the even-numbered blocks LED 30-2 and LED 30-4 is the Y direction plus side.

As shown in the figure, the LEDs 30-1 and 30-2 are alternately arranged at substantially the same position in the Y direction. Similarly, the LEDs 30-3 and 30-4 are alternately arranged at substantially the same position in the Y direction.

In Examples 1 to 5, the plurality of LEDs included in one LED row all have the same light emission direction, but in this example, the light emission directions of LEDs adjacent in the X direction are opposite to each other. I have to. That is, LEDs that emit light in the Y direction + side and LEDs that emit light in the Y direction-side are alternately arranged along the X direction. In this embodiment, different LED substrates 45-1 and 45-2 are used for each LED row. The LED substrates 44-1 and 44-2 are long and thin with the X direction as the longitudinal direction as in the fourth embodiment. The width dimensions of the LED substrates 45-1 and 45-2 are substantially the same as those of the fourth embodiment.

An example of the light shielding pattern 90 in this embodiment is shown in FIG. As shown in FIG. 14, the light shielding pattern 90-1 for the LED 30-1 and the light shielding pattern 90-2 for the LED 30-2 are alternately arranged in accordance with the position of the LED 30 and the light emitting direction. That is, as shown in the figure, the light emitted from the LED 30 whose sides having long radial protrusions are alternately reversed is the same as that of the fourth to sixth embodiments. It is propagated in the Y direction while being emitted from the diffusion plate 20 while reflecting and diffusing the space between them. As in the first embodiment, the inner surface of the base chassis 10 is coated with, for example, white paint to increase the reflectance. Further, a reflection sheet may be laid on the inner front surface of the bottom surface (the surface facing the LED substrate 44) of the base chassis 10, and the LED substrates 45-1 and 45-2 may be disposed thereon. At this time, a reflection sheet may be provided on the LED substrates 45-1 and 45-2 so as to cover the LED mounting surface, or white coating may be applied.

As described above, in this embodiment, since light is propagated in the air layer between the diffusion plate 20 and the base chassis 10, the weight can be reduced without using a light guide plate. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. Furthermore, since the number of the LED boards 45 can be reduced as in the fifth embodiment, the wiring with the LED boards 45 and the connectors (not shown) can be reduced, so that the cost can be reduced. Can do. In addition, since the area of the LED substrate 45 can be further reduced as compared with the fifth embodiment, the weight can be reduced. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, a seventh embodiment of the present invention will be described with reference to FIG. FIG. 15 is a cross-sectional view of the illumination device 106 according to the seventh embodiment of the present invention.

In the light source block 206 used in the illumination device 106 of the seventh embodiment, the LED substrate 46 is fixed to the base chassis 10 by, for example, screwing, as in the first embodiment. The leftmost illumination block 80-1 is provided with LEDs 30-1, and a large number of LEDs 30-1 are attached to the LED board 46 so as to protrude in the Z direction. The same applies to the illumination block 80-2, the illumination block 80-3, and the illumination block 80-4. The light emission direction of the LED 30 is on the + side of the Y direction as in the first embodiment. The LED 30-1, LED 30-2, LED 30-3, and LED 30-4 are similarly arranged in the X direction.

In this embodiment, the reflective sheet 50 having a shape similar to the inner surface shape of the base chassis 10 is disposed on the LED 30 mounting surface side of the LED substrate 46. In other words, in this embodiment, the function of reflecting the LED mounting surface of the LED substrate 46 and the inclined side surface of the base chassis 10 is commonly added by the single reflection sheet 50. The outer shape of the reflection sheet 50 is substantially the same as the inner shape of the base chassis 10, and is a sheet having a hole at a position corresponding to the LED 30. The reflection sheet outer peripheral portion 50-1 is bent so as to have substantially the same shape as the inner surface of the inclined side surface of the base chassis 10. After the LED board 46 on which the LEDs 30 are fixed and held is attached to the base chassis 10, the reflection sheet 50 is attached and fixed to the LED board 46 and the base chassis 10 with a double-sided tape or the like.

The light emitted from the LED 30 is propagated in the Y direction while being emitted from the diffusion plate 20 while being reflected and diffused in the space between the diffusion plate 20 and the reflection sheet 50. The light leaking to the outer periphery is reflected in the emission direction (Z direction) by the reflection sheet outer periphery 50-1. Since the reflectance of the reflective sheet 50 is higher than the reflectance of white coating or the like applied to the reflective surface of the LED substrate 40 or the base chassis 10, light transmission loss can be reduced. That is, since the luminance can be higher than that of the light source block 200 in the first embodiment, the predetermined luminance may be ensured even if the interval between the LEDs 30 is increased and the total number of the LEDs 30 is reduced. In this case, it is possible to reduce the cost of the reduced LED 30 and to save power for the power used for the LED. Further, the number of LEDs 30 may be left as it is, and the voltage applied to the LEDs 30 may be lowered to save power. Further, since the inclined side surface of the base chassis 10 and the reflection of the LED substrate 46 are made common, it is advantageous for cost reduction.

Further, since light is propagated in the air layer between the diffusion plate 20 and the reflection sheet 50, the weight can be reduced without using a light guide plate. In addition, since the plurality of lighting blocks 80 are combined, the number of lighting blocks 80 can be increased to increase the size in the Y direction, and the number of LEDs 30 provided in the lighting block 80 can be increased. If the number is increased, the size in the X direction can be increased. Furthermore, as the LED substrate 46, an inexpensive general-purpose substrate can be used. Moreover, it is not necessary to apply white paint. Further, the inner surface of the base chassis 10 can be omitted from processing such as white coating for improving the reflectance.

In the above-described embodiment, the reflection sheet 50 is extended to the outer periphery of the base chassis 10 to provide the reflection sheet outer periphery 50-1. However, only the flat surface portion (LED substrate 46) is provided on the reflection sheet 50. The outer peripheral portion may utilize the reflection of the inner side surface of the base chassis 10. It goes without saying that the light control for each illumination block can be performed in the same manner as in the first embodiment.

Next, an eighth embodiment of the present invention will be described with reference to FIG. FIG. 16 is a cross-sectional view of the illumination device 107 according to the eighth embodiment of the present invention. The description of the elements having the same operation or function as the elements denoted by the same reference numerals shown in FIGS.

In the lighting device 107 according to the eighth embodiment, two light source blocks 200-1 and 200-2 are arranged inside a housing 301 including a case 71 and a diffusion cover 61. As the two light source blocks 200-1 and 200-2, those in the first embodiment are used in this example. According to the present embodiment, by arranging the two light source blocks 200 in one housing 301, the lighting device 107 having a size approximately twice as large can be obtained.

As described above, by arranging the plurality of light source blocks 200 in the housing 301, it is possible to easily cope with an increase in size. Needless to say, when three or more light source blocks 200 are arranged, a larger illumination device can be obtained.

In the above embodiment, the case where a plurality of light source blocks 200 according to the first embodiment are arranged has been described. However, the present invention is not limited to this, and a plurality of light source blocks 201 to 206 used in other embodiments are provided. Or you may arrange | position in combination. Needless to say, if any one of the light source blocks of the first to seventh embodiments is used, the same effects as those of the first to seventh embodiments can be obtained.

Next, a ninth embodiment of the present invention will be described with reference to FIG. FIG. 17 is a cross-sectional view of the illumination device 108 according to the ninth embodiment of the present invention. In the light source block 207 used in the illumination device 108 of Example 9, the light shielding pattern 90 is omitted from the light source block 200 of FIG. Therefore, detailed description of the configuration and function of the light source block 207 is omitted.

The illuminating device 108 of Example 9 is an illuminating device that can be used when installed in a place where a large space in the thickness direction (Z direction) for the illuminating device can be secured, for example, when embedded in the ceiling. As shown in FIG. 16, the Z direction of the case 72 is increased, and the distance H2 between the diffusion plate 20 and the diffusion cover 62 is increased. This distance H2 is larger than H1 in FIG. 3, and is, for example, about 2 to 5 times the thickness of the light source block (the distance from the back surface of the base chassis 10 to the light emitting surface of the diffusion plate 20). However, the present invention is not limited to this. By increasing the distance H2, even if there is a large luminance unevenness in the diffusion plate 20 portion, the diffusion cover 62 portion is made uniform, so that the light shielding pattern 90 can be omitted as described above. Thereby, since the process of printing the light shielding pattern 90 on the diffusion plate 20 can be omitted, the cost can be reduced.

In the above embodiment, the case where the light shielding pattern of the light source block 200 of Embodiment 1 is omitted has been described. However, the present invention is not limited to this, and the light source blocks 201 to 206 used in other embodiments are not limited thereto. Any one of which the light shielding pattern is omitted may be arranged. Needless to say, the illumination device using any one of the light source blocks of the first to seventh embodiments can achieve the same effects as those of the first to seventh embodiments.

Next, a tenth embodiment of the present invention will be described with reference to FIGS. FIG. 18 is a cross-sectional view of the illumination device 109 according to the tenth embodiment of the present invention. FIG. 19 is a plan view of the illumination device 109 according to the tenth embodiment when the light source block 208 with the diffusion plate 20 removed is viewed from the Z direction.

In the first to ninth embodiments, the base chassis 10 has a box shape, a bowl shape, or a tray shape with the opening in the Z direction. However, the base chassis 11 of this embodiment has a flat plate shape. . On the surface of the base chassis 11 on the irradiation direction side, a reflection sheet 51 formed in a box shape, a bowl shape, or a tray shape with an opening facing the irradiation direction side is placed. The reflection sheet 51 is made of, for example, a white resin material. That is, in this embodiment, unlike the first to ninth embodiments, the housing of the light source block 208 is constituted by, for example, a resin reflection sheet 51 instead of a metal base chassis.

As shown in the figure, the diffusion plate 20 is arranged so as to cover the opening of the reflection sheet 51, and is fixed to the base chassis 11 together with the reflection sheet 51 by screws 96 at four corners of the diffusion plate 20. Is done. On the bottom surface of the reflection sheet 51, two LED boards 46-1 and 46-2 on which LEDs are mounted are attached by, for example, different screws or adhesives. A cylindrical spacer 95 is provided between the bottom surface of the reflection sheet 51 and the diffusion plate 20, and the diffusion plate 20 and the reflection sheet 51 are fixed to the base chassis 11 with screws 96 via the cylindrical spacer 95. Is done. That is, the screw 96 is screwed into the screw hole provided in the base chassis 11 through the hole of the diffusion plate 20, the cylindrical spacer 95, and the hole of the reflection sheet 51. Thereby, a space having the same distance as the height of the cylindrical spacer 95 is maintained between the bottom surface of the reflection sheet 51 and the diffusion plate 20.

Further, as shown in the figure, the LED substrate is composed of two substrates 46-1 and 46-2, which are fixed to the base chassis 11 with screws, for example, through the bottom surface of the reflection sheet 51. Here, the total area of the LED substrates 46-1 and 46-2 is smaller than the area of the bottom surface of the reflection sheet 51 as shown in FIG. In addition, the diffusion plate 20 and the reflection sheet 51 are screwed and fixed to the base chassis 11 with screws 95 in the area outside the lines 46-2. In the present embodiment, two LED arrays are mounted on each of the LED substrates 46-1 and 46-2, and the light emission directions of the LEDs in each LED array are all the same. However, it goes without saying that the LED arrangement shown in FIGS. 11 and 13 can also be applied.

According to the configuration of the present embodiment, since the casing of the light source block 208 is configured by the resin reflection sheet 51, the light source block 208 and a lighting device using the same can be reduced in weight. In the present embodiment, the reflective sheet 51 is made of a white material, but it may have any form as long as the inner surface can reflect light. For example, the inner surface may be white-coated.

Next, an eleventh embodiment of the present invention will be described with reference to FIGS. FIG. 20 shows an example of the circuit configuration or connection configuration of the LED array according to this embodiment.

20, four LED rows each having a plurality of (six in FIG. 20) LEDs 30 physically arranged in a row are mounted on an LED substrate (not shown here). In FIG. 20, each LED row is indicated by reference numerals 35-1 to 35-4. Here, if all of the LEDs (six in FIG. 20) in one LED row 35 are connected in series, the supply of current to all the LEDs will be interrupted if one of them is disconnected due to a failure or the like. . That is, in this case, when one LED in the LED row is disconnected, all the LEDs cannot be turned on.

Therefore, in the present embodiment, for each of the LED rows 35-1 to 35-4, the 2n-1th (where n is an integer equal to or greater than 1) LEDs 30 from the head (end) are connected in series to form the first LED series circuit 36. The second LED series circuits 37-1 to 3-4, which are different from the first LED series circuits 36-1 to 36-4, are configured by connecting the 2n-th LEDs 30 in series. The first LED series circuits 36-1 to 36-4 and the second LED series circuits 37-1 to 3-4 are connected in parallel. In other words, in this embodiment, the first LED series circuits 36-1 to 36-4 and the second LED series circuits 37-1 to 3-4 are connected in parallel, and the first LED series circuits 36-1 to 36-4 are connected to each other. The LED row 35 is configured by alternately arranging the LEDs 30 having the LEDs 30 and the LEDs 3 having the second LED series circuits 37-1 to 3-4 in one row.

With this configuration, for example, even if one of the LEDs 30 belonging to the first LED series circuit 36-1 among the plurality of LEDs 30 included in the LED array 35-1 becomes disconnected due to a failure or the like, the second Since the current can be supplied to the LED series circuit 37, it is possible to avoid turning off all the LEDs in the LED array. In addition, since the LEDs 30 included in the first LED series circuit 36 and the LEDs 30 included in the second LED series circuit 37 are alternately arranged, the LEDs 30 of the first LED series circuit 36 are temporarily turned off due to a failure or the like. Even in this case, it is possible to reduce the bias of the spatial light distribution due to the lighting of the remaining LEDs (that is, the LEDs 30 included in the second LED series circuit 37).

FIG. 21 shows another example of the circuit configuration or connection configuration of the LED array according to this embodiment. This example includes a first LED array 35-1a configured by alternately arranging LEDs included in the first LED series circuit 36-1a and LEDs included in the second LED series circuit 37-1a, A second LED array 35-1b configured by alternately arranging the LEDs included in the first LED series circuit 36-1b and the LEDs included in the second LED series circuit 37-1b in one line is arranged in an LED array. The LED array 350-1 having a larger number of LEDs is arranged side by side along the direction. The other LED rows 350-2 to 4-4 have the same configuration. The number of LEDs is not limited to that shown in the figure.

Similarly to the example of FIG. 20, in this example, the first LED series circuit 36-1a and the second LED series circuit 37-1a are connected in parallel, and the first LED series circuit 36-1b and the second LED series circuit 36-1b are connected in parallel. The LED series circuit 37-1b is also connected in parallel. Two LED series circuits (36-1a and 36-1b) constituting the first LED row 35-1a and two LED series circuits (37-1a and 37-) constituting the second LED row 35-1b 1b) is also connected in parallel. That is, in this example, the LED string 350-1 includes four LED series circuits (36-1a, 36-1b, 37-1a, and 37-1b).

Further, in the LED row 350-1 of FIG. 21, the “x” mark 33 indicates a portion where the wiring pattern on which the LED is mounted is formed but the LED is not actually mounted. That is, in this example, all the LEDs of the second LED series circuits 37-1a and 37-1b are not mounted.

According to this configuration, the number of LEDs mounted can be adjusted according to the application. For example, when the lighting device is used for the purpose of illuminating a wide area with high brightness, LEDs are mounted or connected to all of the first LED series circuit and the second LED series circuit, and high brightness is required. When the lighting device is used for an application that does not, the LED is not mounted or connected to either the first LED series circuit or the second LED series circuit. That is, according to the configuration of this example, since the number of LEDs mounted can be adjusted according to the application, the process of designing and manufacturing a different illumination device for each application is reduced, and the cost of the illumination device can be greatly reduced. . In addition, since the LEDs included in the first LED series circuit and the LEDs included in the second LED series circuit are alternately arranged, the LED is not mounted or connected to either the first or second LED series circuit. However, it is possible to maintain the uniformity of the spatial luminance distribution of the illumination light.

As described above, according to the configuration of the eleventh embodiment, it is possible to irradiate illumination light even when one LED in the LED row breaks down, and to make the spatial luminance luminance distribution of the illumination light uniform at that time. It becomes possible to maintain sex. Furthermore, it is easy to adjust the number of LEDs, and even when the number of LEDs is reduced (that is, when LEDs are not mounted or connected to either the first or second LED series circuit), the illumination light space is reduced. It is possible to maintain a uniform luminance luminance distribution.

Needless to say, the present embodiment is not limited to the LED array as shown in FIG. 20 or FIG. Of course, the configurations of the first to tenth embodiments can be appropriately applied to the present embodiment.

Next, a twelfth embodiment of the present invention will be described with reference to FIGS. 22 (a) and (b). FIG. 22A shows a cross section of the diffusing plate 21 in the YZ plane, and FIG. 22B shows a cross section of the YZ plane.

The diffusion plate 20 according to the first embodiment shown in FIG. 3 is formed on the surface on the LED 30 side with a convex portion and a concave portion (prism) having a triangular cross section on the YZ plane extending in the Y direction. The diffusion plate 21 according to the present embodiment is formed to extend in the X direction. That is, the diffusion plate 21 according to the present embodiment has triangular convex portions and concave portions (prisms) on the surface (light incident surface) on the LED 30 (on the Z direction) side, and the prism is in the X direction. That is, it is arranged in a plurality in a direction parallel to the light emission direction of the LED and extends in the Y direction, that is, a direction orthogonal to the light emission direction of the LED.

According to such a configuration, the light incident on the diffusion plate 21 is propagated while being reflected by the prism recesses along the extension direction (X direction) of the prism. Can be fully supplied. For this reason, according to the present Example, the relative brightness fall between LED can be suppressed. Moreover, the incident angle of the light incident on the LED side surface of the prism is smaller than that of the light incident on each surface of the prism of the diffusion plate 20 of FIG. For this reason, among the light incident on the LED side surface of the prism of the diffusion plate 21, the light incident on the inside of the diffusion plate 21 from the LED side surface is totally reflected by the LED side surface. More than light. The light incident on the inside of the diffusion plate 21 is propagated or guided in the Y direction while diffusing and reflecting inside the diffusion plate 21. Therefore, according to the present embodiment, compared with the diffuser plate 20 of FIG. 3, the light is more easily propagated to the front end of the illumination block, and the luminance unevenness in the Y direction in one illumination block can be further reduced. .

In addition, in the illuminating device of the said Example 1 thru | or Example 12, although case 70 (71, 72) is arrange | positioned for illuminating devices, it is in the position away from the

diffuser plate

20 or 21 by predetermined distance H1 (H2). Since it is sufficient that the diffusion cover 60 (61, 62) can be disposed, the diffusion cover 60 (61, 62) may be fixedly held by using a part of another structure such as a building.

The embodiments described above can be arbitrarily combined as necessary. Further, in each embodiment, RGB primary three-color LEDs may be used in place of the white LEDs, and the overall illumination light or the color of the illumination light may be adjusted for each illumination block according to a user instruction.

10

Base chassis

20, 21 Diffuser 30 LED
35, 350 LED array 36 1st LED series circuit 37 2nd

LED series circuit

40, 41, 42, 43, 44, 45, 46 LED board 50

Reflective sheet

60, 61, 62

Diffusion cover

70, 71, 72 Case 95

Cylindrical spacer

100, 101, 102, 103, 104, 105, 106, 107, 108

Illumination device

200, 201, 202, 203, 204, 205, 206

Light source block

300, 301, 302 Housing

Claims

An illumination device for irradiating light from an LED as a light source as illumination light,
A base chassis provided with an opening in the illumination direction of the illumination light;
An LED substrate mounted on the base chassis on which the LED is mounted;
Diffusion for diffusing the light from the LED and the light reflected by the LED substrate and / or the base chassis, which is disposed at a predetermined distance from the LED substrate in the opening of the base chassis. The board,
A diffusion cover as an exterior of the illuminating device for further diffusing light from the diffusion plate, which is disposed at a predetermined distance from the diffusion plate;
The LED is attached to the LED substrate so as to emit light in a direction perpendicular to the irradiation direction and parallel to the LED substrate, and the diffuser plate has a light emitting direction of the LED. An illumination device having a function of propagating or guiding light in parallel directions.
2. The lighting device according to claim 1, wherein a white coating or a reflection sheet for reflecting light is provided on an LED mounting surface of the LED substrate and / or an inner surface of the base chassis.
2. The lighting device according to claim 1, wherein the LED is a side-view type LED, and emits white, daylight, or light bulb color light.
2. The illumination device according to claim 1, wherein the diffuser plate has a triangle-shaped concavo-convex section extending in a light emitting direction of the LED on the surface on the LED side, and the triangular concavo-convex forms the An illumination device characterized by propagating or guiding light in a direction parallel to a light emitting direction of the LED.
2. The illumination device according to claim 1, wherein the diffuser plate has a triangle-shaped concavity and convexity formed in a cross-section extending in a direction orthogonal to the light emitting direction of the LED on the surface on the LED side. An illuminating device characterized in that light is propagated or guided in a direction orthogonal to a direction parallel to the light emitting direction of the LED by the unevenness.
The lighting device according to claim 1, wherein a light transmission amount shading pattern is provided at a position corresponding to the LED of the diffusion plate, and the shading pattern is mixed with white ink or white or black or blue ink. It is formed by printing ink on the said diffusion plate, The illuminating device characterized by the above-mentioned.
2. The illumination device according to claim 1, wherein a film on which a light shielding pattern is printed is attached to the diffusion plate so that the light shielding pattern corresponds to the LED in position.
7. The illuminating device according to claim 6, wherein the light shielding pattern has radial protrusions extending toward a light emitting direction side of the LED.
2. The lighting device according to claim 1, further comprising: an LED array in which a plurality of the LEDs are arranged in a direction orthogonal to the light emission direction of the LED, wherein the LED array includes a plurality of LED arrays along the light emission direction of the LED. An illuminating device that is arranged.
10. The illumination device according to claim 9, wherein the light emission direction of each LED in each LED row is the same.
10. The illumination device according to claim 9, wherein the light emission direction of the LED in one side LED row and the light emission of the LED in the other side LED row are based on the center of the light emission direction of the LED of the illumination device. A lighting device characterized in that directions are opposed to each other.
10. The illumination device according to claim 9, wherein the light emission direction of the LED in one side LED row and the light emission of the LED in the other side LED row are based on the center of the light emission direction of the LED of the illumination device. A lighting device characterized in that directions are opposite to each other.
The lighting device according to claim 9, wherein an LED row group is configured by disposing the back surfaces of two LED rows facing each other, and the LED row group is formed at the center of the light emitting direction of the LED of the lighting device. An illuminating device characterized by being symmetrically arranged with respect to.
10. The illuminating device according to claim 9, wherein light emitting directions of adjacent LEDs in each LED row are opposite to each other.
2. The lighting device according to claim 1, wherein a reflection sheet having a shape similar to the shape of the inner surface of the base chassis is provided on the LED substrate and the inner surface of the base chassis.
The lighting device according to claim 9, wherein the 2n−1th LED in the LED row is connected in series to the first LED series circuit, and the 2nth LED is connected in series to the second LED series circuit. The lighting device is characterized in that the first LED series circuit and the second LED series circuit are connected in parallel.
The lighting device according to claim 1, further comprising a case that forms an exterior of the lighting device together with the diffusion cover, and a plurality of light source units including the base chassis, the LED substrate, and the diffusion plate, the diffusion. A lighting device housed in an exterior composed of a cover and the case.
2. The illumination device according to claim 1, wherein a distance from a light emitting surface of the diffusion plate to a light incident surface of the diffusion cover is 0.5 of a distance from a back surface of the base chassis to a light emitting surface of the diffusion plate. An illuminating device characterized by being double to five times.
An illumination device for irradiating light from an LED as a light source as illumination light,
A flat base chassis;
A reflective sheet attached to the base chassis and facing the opening in the illumination direction of the illumination light, formed in a box shape, a bowl shape or a tray shape;
An LED substrate on which the LED is mounted, attached to the bottom side of the reflective sheet;
Diffusion for diffusing the light from the LED and the light reflected by the LED substrate and / or the reflection sheet, which is disposed at a predetermined distance from the LED substrate at the opening of the reflection sheet. The board,
A diffusion cover as an exterior of the illuminating device for further diffusing light from the diffusion plate, which is disposed at a predetermined distance from the diffusion plate;
The LED is attached to the LED substrate so as to emit light in a direction perpendicular to the irradiation direction and parallel to the LED substrate, and the diffuser plate has a light emitting direction of the LED. A lighting device having a function of propagating or guiding light in parallel directions.
20. The lighting device according to claim 19, wherein a cylindrical spacer is provided between a bottom surface of the reflection sheet and the diffusion plate, and the reflection sheet and the diffusion plate are connected to the base chassis via the cylindrical spacer. A lighting device, wherein the lighting device is fixed by screwing.