JP2012109070A - Surface light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a surface light-emitting device in which uniform light is emitted from the whole surface by making the brightness at the joint portion formed at the time of connecting light guide plates equal to the level of the brightness of the other portions.SOLUTION: The surface light-emitting device 10 is formed of a plurality of light guide plates 11 connected in a plane form. Each of light guide plates 11 includes: a reflector 16 which reflects light from a light source 15 at the side part toward the front surface side; a diffusion plate 17 which diffuses the reflecting light from the reflector 16; and a diffusion lens body 14 of a convex shape, which covers the joint portion 13 formed at the time of connecting the light guide plates 11 from the front surface side.

Description

  The present invention relates to a surface light emitting device formed by connecting a plurality of light guide plates in a planar shape.

  Conventionally, for example, in the field of illumination signs and special lighting in the construction industry, thin surface light emitting devices have been used.

  As this type of conventional surface light emitting device, a light guide plate is generally known. This light guide plate is usually provided with a light source such as an LED (Light-Emitting Diode) on the side, and the light emitted from the light source is reflected on the surface side by the reflector and then diffused by acrylic. The light is diffused by the plate and the surface is emitted uniformly (see, for example, Patent Document 1 or 2).

Japanese Patent No. 3463060 Japanese Patent No. 3500466

  However, in the above-described conventional surface light emitting device (light guide plate), since the LEDs are provided on the sides, the entire surface can be brightened when the surface area of the light guide plate is small, but when the surface area is large. Had the problem that it was difficult to brighten the whole. Also, because it is necessary to make a custom-made product of different sizes and shapes depending on the installation location of the signboard or lighting, it takes time to produce, shortening the delivery time, reducing the cost, and expanding the application. There was also a problem that it was difficult to plan.

  Therefore, in order to solve such a problem, it is conceivable to arrange and connect a plurality of light guide plates in a grid shape. In this case, however, the brightness of the joint portion generated when the light guide plates are connected is considered. However, since the seam becomes darker than other portions and the seam can be visually recognized from the surface side, there is a problem that it is difficult to emit light uniformly from the entire surface of the surface light emitting device.

  The present invention has been made in order to solve the above-described problems, and allows the brightness of the seam generated when the light guide plates are connected to be equal to that of the other parts to uniformly emit light from the entire surface. The object is to provide a light emitting device.

In order to achieve the above-mentioned object, the present invention is a surface light emitting device formed by connecting a plurality of light guide plates in a planar shape, and each light guide plate receives light from a side light source on the surface side. And a diffusing plate that diffuses the reflected light from the reflector,
A convex diffusing lens body that covers a seam generated when the light guide plates are connected from the surface side is provided.

  The surface light emitting device according to the present invention is provided with a frame main body corresponding to each of the light guide plates, and the frame main body is formed with a light guide plate support portion that supports the light guide plate from the back side. And a side part extending from the outer peripheral part of the bottom part through a side proximity position of the light guide plate, and the tip part of the side part includes a tip part of the side part of the adjacent frame body. A diffusing lens body supporting portion that cooperates to support the diffusing lens body is formed.

  In the surface light emitting device according to the present invention, the diffusing lens body includes a diffusing portion having a narrow and semi-cylindrical shape wider than the joint, and a longitudinal direction of the diffusing portion on the back side of the diffusing portion. An extending rod-shaped fixing portion is provided, and the diffusion lens body support portion is formed with a recess into which the fixing portion can be fitted.

  Furthermore, in the surface light-emitting device according to the present invention, the side portion of the frame main body is provided with a protrusion that extends outward so as to contact the side portion of the adjacent frame main body.

  According to the present invention, since different sizes and shapes can be easily produced, it is possible to shorten the delivery time and cost, and to expand the application of the surface emitting device. it can.

  In addition, the diffusion lens body collects the light diffused by the diffusion plate at the joint portion generated when connecting the light guide plates, and further diffuses, so the brightness of the joint portion becomes the same level as the other portions, Light can be emitted uniformly from the entire surface of the surface light emitting device.

It is a top view which shows the surface emitting device which concerns on embodiment of this invention. It is a top view which shows the frame main body of the surface emitting device which concerns on embodiment of this invention. It is a side view which shows the frame main body seen from the A direction of FIG. 2 in the surface emitting device which concerns on embodiment of this invention. It is a side view which shows the frame main body seen from the B direction of FIG. 2 in the surface emitting device which concerns on embodiment of this invention. It is a side view which shows the part of the joint of a light-guide plate in the surface emitting device which concerns on embodiment of this invention.

  Hereinafter, surface emitting devices according to embodiments of the present invention will be described with reference to the drawings. Here, FIG. 1 is a plan view showing a surface light emitting device according to an embodiment of the present invention, FIG. 2 is a plan view showing a frame body of the surface light emitting device according to the embodiment of the present invention, and FIG. FIG. 4 is a side view showing a frame body viewed from the direction A in FIG. 2 in the surface light emitting device according to the embodiment. FIG. 4 shows the frame body viewed from the direction B in FIG. 2 in the surface light emitting device according to the embodiment. FIG. 5 is a side view showing a joint portion of the light guide plate in the surface light emitting device according to the embodiment of the present invention.

  In the surface light emitting device 10 according to the present embodiment, a plurality of square light guide plates 11 are supported on a frame main body 12 provided corresponding to each light guide plate 11 and arranged in a grid shape, and each frame main body 12 is arranged. A convex diffusing lens body 14 is provided that covers the seam 13 generated when the light guide plate 11 is connected from the surface side.

  The light guide plate 11 includes a light source 15 provided on the outer peripheral portion, a reflection plate 16 that forms the bottom surface of the light guide plate 11, and a diffusion plate 17 that is provided at a close position on the surface side of the reflection plate 16. The thickness is 6 mm or 8 mm.

  An LED (Light-Emitting Diode) is used as the light source 15 and is provided so as to emit light from the side toward the reflection plate 16.

  A plurality of V-shaped grooves (not shown) are formed in the reflecting plate 16, and these grooves have a function of uniformly dispersing light emitted from the light source 15 with respect to the diffusion plate 17. Yes. Further, the grooves are arranged at a wide interval in the vicinity of the light source 15 and are arranged so that the interval becomes narrower as the distance from the light source 15 is increased, so that the light is emitted from the light guide plate 11 with uniform luminance. It has become.

  An acrylic plate is used for the diffusion plate 17 and is provided so as to uniformly diffuse the reflected light from the reflection plate 16 toward the outside.

  The frame main body 12 has a bottom portion 18 that has a substantially octagonal ring shape in plan view, and a side portion 19 that rises from the outer peripheral portion of the four sides of the bottom portion 18 at a substantially right angle and extends through a position adjacent to the side of the light guide plate 11. And are formed.

  The bottom portion 18 is formed with light guide plate support portions 20 for supporting the light guide plate 11 from the back side at four locations at equal intervals, and screws for fixing the frame body 12 are inserted between the light guide plate support portions 20. Possible attachment holes 21 are formed in four places. Each light guide plate support portion 20 is configured by arranging four support convex portions 22 bent in a convex shape in a rectangular shape at equal intervals, and a wiring space 23 between each support convex portion 22. Is formed. When the light guide plate 11 is supported by the light guide plate support unit 20, for example, a buffer material (not shown) of 0.7 mm may be interposed between the light guide plate support unit 20 and the light guide plate 11.

  Each side portion 19 is formed with two diffusion lens body support portions 24 at the tip portion, and the diffusion lens body support portion 24 straddles the light guide plate 11 supported by the light guide plate support portion 20. Thus, the latching convex part 25 which protrudes at right angles to the inner side, and the fitting concave part 26 formed in the semicircular column shape on the outer surface are provided. And the separation distance of the latching convex part 25 and the light-guide plate support part 20 mounts the light-guide plate 11 of thickness 6mm or 8mm in the light-guide plate support part 20 through the said buffer material of thickness 0.7mm, and also Even if a 1 mm acrylic plate is placed on the surface of the light guide plate 11, a gap is formed between the light guide plate 11 and the latching projection 25 and the light guide plate 11 is set so as not to drop off. And by providing a gap between the light guide plate 11 and the latching convex portion 25 in this way, it is possible to prevent the light guide plate 11 from being damaged even during an earthquake with a seismic intensity of about 5, It can improve earthquake resistance.

  The diffusing lens body support portions 24 are arranged at positions that do not match each other on the plane with the diffusing lens body support portions 24 of the adjacent frame main bodies 12, and cooperate with the diffusing lens body support portions 24 of the adjacent frame main bodies 12. Thus, the diffusing lens body 14 is supported by being sandwiched from both sides.

  The diffusing lens body 14 includes an acrylic diffusing portion 27 that is elongated and has a semi-cylindrical shape wider than the seam 13, and a rod-shaped fixing portion 28 that extends along the longitudinal direction of the diffusing portion 27 on the back side of the diffusing portion 27 The fixing lens 28 is fitted into the fitting recess 26 of the diffusing lens body support 24, so that the diffusing lens body 14 is supported by the diffusing lens body support 24. The diffusing unit 27 completely covers the diffusing lens body supporting unit 24 from the surface side, and both edge portions 30 of the diffusing unit 27 are applied to the diffusing plate 17 of the light guide plate 11 in plan view, and collect the light diffused by the diffusing plate 17 Can be done. Further, the diffusing portion 27 is formed such that both edge portions 30 thereof do not approach the light guide plate 11 from the latching convex portion 25, and the diffusing portion 27 does not interfere with the light guide plate 11.

  Furthermore, a protrusion 29 is formed on the side 19 of the frame body 12 so as to extend outward, and the tip of the protrusion 29 abuts on the side 19 of the adjacent frame body 12. The distance between the adjacent frame main bodies 12 is kept constant, so that each light guide plate 11 can be easily and reliably installed at a predetermined position.

  In the surface light emitting device 10 having such a configuration, light from the light source 15 is radiated from the side toward the reflecting plate 16, and is uniformly dispersed and reflected by the function of the groove on the reflecting plate 16, and then diffused. The light is uniformly diffused by the plate 17 and radiated to the outside. At this time, in the joint portion 13, the diffusion portion 27 of the diffusion lens body 14 collects the light diffused by the diffusion plate 17 and further diffuses it. As a result, the brightness of the joint portion 13 reaches the same level as the other portions, and light can be emitted uniformly from the entire surface of the surface light emitting device 10.

  In addition, since description of embodiment of this invention mentioned above has described the preferred embodiment in the surface emitting device which concerns on this invention, although there are some technically preferable restrictions, it may attach. The technical scope of the present invention is not limited to these embodiments unless specifically described to limit the present invention. Furthermore, the components in the embodiment of the present invention described above can be appropriately replaced with existing components and the like, and various variations including combinations with other existing components are possible. The description of the embodiment of the present invention described above does not limit the contents of the invention described in the claims.

DESCRIPTION OF SYMBOLS 10 Surface light-emitting device 11 Light guide plate 12 Frame main body 13 Seam 14 Diffusing lens body 15 Light source 16 Reflector 17 Diffusing plate 18 Bottom part 19 Side part 20 Light guide plate support part 24 Diffusing lens body support part 26 Fitting recessed part 27 Diffusion part 28 Fixing part 29 Projections

Claims (4)

A surface light emitting device formed by connecting a plurality of light guide plates in a planar shape,
Each light guide plate is provided with a reflector that reflects light from a side light source to the surface side, and a diffusion plate that diffuses reflected light from the reflector,
A surface light emitting device comprising a convex diffusing lens body covering a seam generated when connecting the light guide plates from the surface side.   A frame main body is provided corresponding to each of the light guide plates. The frame main body has a bottom portion on which a light guide plate support portion for supporting the light guide plate from the back side is formed, and an outer peripheral portion of the bottom portion of the light guide plate. A side portion extending through a lateral proximity position, and a diffusion portion that supports the diffusion lens body in cooperation with a distal end portion of a side portion of an adjacent frame body at a distal end portion of the side portion. The surface light-emitting device according to claim 1, wherein a lens body support portion is formed.   The diffusion lens body is provided with a long and narrow diffusion portion having a semi-cylindrical shape and a rod-shaped fixing portion extending along the longitudinal direction of the diffusion portion on the back side of the diffusion portion, The surface light emitting device according to claim 2, wherein the diffusion lens body support portion is formed with a recess into which the fixing portion can be fitted. The surface light-emitting device according to claim 2, wherein a protrusion extending outward is provided on a side portion of the frame main body so as to contact a side portion of an adjacent frame main body.

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