JPH04109702U - Uniform lighting board and uniform lighting device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve a uniform illumination plate used in a display device, etc., and to be able to more uniformly and evenly illuminate a film showing a product, etc. [Structure] A recess 14 is formed on the surface of a light guide plate 12 made of acrylic resin or the like, the larger the distance from the end face 16 where a light source 18 is disposed, the larger the recess 14 is.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a uniform illumination plate and a uniform illumination device, especially for use in signboards, display devices, etc. A uniform illumination plate that uniformly illuminates advertising media, information media, etc. from the back and its uniform illumination. This invention relates to a uniform illumination device using a bright plate.

0002

[Conventional technology]

Generally, signboards are made by lighting advertising media such as letters and figures from behind. The advertising medium is made to stand out and attract the viewer's attention. Also, the product For display devices such as displays and liquid crystal displays, the information medium cannot be illuminated from the back. This makes the information medium easier to view.

0003 In this way, advertising media, information media, etc. are illuminated uniformly from the back. For example, there was a uniform illumination plate 1 as shown in FIG. This uniform illumination plate 1 is made of acrylic A plurality of grooves 3 are formed in a light guide plate 2 made of resin or the like, and near an end surface 4 of the grooves 3. Light is emitted from a light source 5 such as a fluorescent tube provided, and the light transmitted through the light guide plate 2 is The light is refracted and diffused by the groove 3.

0004

[Problem that the idea aims to solve]

However, such a uniform illumination plate 1 becomes more distant from the end surface 4 where the light is irradiated. This is not sufficient to uniformly illuminate advertising media, etc. It was. Especially for devices that display detailed characters, etc., devices that can provide more uniform illumination are strongly recommended. It had been requested.

[0005] Therefore, the inventor of the present invention aimed to provide a uniform lighting system that can illuminate advertising media, etc. more uniformly and evenly. As a result of extensive research in order to provide a lighting board, we have come up with this invention.

[0006]

[Means to solve the problem] The gist of the uniform illumination plate according to the present invention is that a light guide plate made of a translucent material on at least one surface of the light guide plate, the farther from the one or more end faces of the light guide plate, the more This is because a large depression was formed.

[0007] Further, in such a uniform illumination plate, the recesses may be arranged in a grid pattern or a staggered pattern. It lies in being.

[0008] Furthermore, the gist of the uniform illumination device according to the present invention is that the uniform illumination plate; a linear light source disposed close to one or more end surfaces of the uniform illumination plate; The present invention also includes a reflecting plate disposed on either one of the front surfaces of the bright plate.

[0009]

[Effect]

In such a uniform illumination plate, a light source is provided on a predetermined end face of a light guide plate, and light is emitted from the light source. It is used by irradiating a predetermined end face of a light guide plate. The light irradiated onto a given end face is The light is transmitted through the light guide plate and refracted by the recess formed on the surface of the light guide plate. Then, it is diffused from the inner surface of the recess to the outside. Concavities formed on the surface of the light guide plate The area is formed so that it becomes larger as it gets farther from the predetermined end face where the light source is installed. On the other hand, the larger the recess, the more light is diffused. Therefore The light transmitted through the light guide plate is gradually attenuated. The shape becomes larger as it gets farther from the end face, so it spreads almost uniformly in all recesses. A uniform illumination plate with almost no unevenness can be obtained.

0010 In addition, if the surface of the light guide plate has recesses arranged in a grid pattern, the light source will not be arranged. The light that passes through the vicinity of a recess near a predetermined end face is not refracted by the next larger recess. The light is then diffused to the outside, and the light is sequentially diffused. On the other hand, the recess Even if they are arranged in a staggered manner, the light will be diffused sequentially in the same way. become.

[0011] Next, in a uniform illumination device using such a uniform illumination plate, the light emitted from the light source is guided. It passes through the body plate, part of it is refracted at the recess and diffused to the outside, and the rest is The light from the light source is reflected by the reflector and diffused to the outside, contributing to the lighting in an efficient manner. Ru. The reflector plate placed on either surface of the uniform illumination plate has a recess formed therein. It may be placed on the surface side where the recess is formed, or it may be placed on the surface side where the recess is not formed. Also good. If a reflective plate is placed on the surface side where the recesses are formed, the light will be diffused from the recesses. The reflected light is reflected by the reflector and transmitted through the light guide plate again, eliminating unevenness. No illumination light is obtained.

0012

【Example】

Next, embodiments of the uniform illumination plate according to the present invention will be described in detail with reference to the drawings. As shown in FIG. 1, the uniform illumination plate 10 according to the present invention is made of acrylic resin, glass, etc. Recesses 14 are formed in a grid pattern at equal intervals on the surface of the light guide plate 12 made of a transparent material. It is composed of These recesses 14 are shaped like a truncated cone or a cone, and have a diameter of is formed larger as it gets farther from the end face 16 where the light is irradiated, and its depth is The deeper the distance from the end face 16, the deeper the groove is formed. Note that the drawings are for simple illustration of the embodiments. This is a schematic diagram for clarity, and in an actual embodiment, a large number of recesses 14 are formed extremely densely. It is.

[0013] A linear light source 18 such as a fluorescent tube is disposed near the end surface 16 of the uniform illumination plate 10. The end face 16 is irradiated with light. The light irradiated onto the end surface 16 is transmitted to the light guide plate 12. A part of it is first refracted at the first recess 14 and diffused to the outside. I am made to do so. The light that has passed through the vicinity of the first recess 14 passes through the light guide plate 12. A part of it is refracted in the next recess 14, while being slightly attenuated by and spread to the outside. Compared to the first recess 14, the next recess 14 has both diameter and depth. is formed in a large size and is diffused at a higher rate than the first depression 14. On the other hand, the light reaching the next recess 14 is slightly attenuated, so its diffusion is The light becomes approximately the same intensity as the initial diffused light. The light transmitted in this way is reflected in the concavity 1. 4, but the recess 14 is far from the end face 16. Since it is formed so large, it can be uniformly diffused as a whole. did Therefore, if a film or the like showing a product is laid on the surface of this uniform illumination plate 10, the It is possible to illuminate films, etc. uniformly and evenly.

[0014] Above, one embodiment of the uniform illumination plate according to the present invention has been described in detail. The present invention is not limited to the examples, and may be implemented in other embodiments.

[0015] For example, only the diameter of the recess 14 is formed to increase as the distance from the end face 16 increases. Alternatively, only the depth of the recess 14 may be formed to be deeper as the distance from the end surface 16 increases. It's okay if it is.

[0016] In addition, as shown in FIG. A uniform illumination plate 22 may also be formed. According to this uniform illumination plate 22, the recess 20 and The light transmitted between the recesses 20 is refracted at the recesses 20 in the next row and diffused to the outside. It will be done. Therefore, since the light irradiated onto the end face 16 is effectively diffused, Brighter scattered light can be obtained. Also, although not shown, the distance between the recesses should be adjusted far from the end face. It is also possible to make it as wide as possible, or conversely to make it narrower. these As is clear from the example, the position of the recess is such that the intensity of the diffused light is uniform. It is sufficient to set the appropriate declaration so as to meet the requirements, and there is no limitation in any way.

[0017] Furthermore, as shown in FIG. 4 is provided with a reflecting mirror 26, and the recess 28 is located farther from the end surface 16. The end face 24 is formed so that it becomes larger, and the end face 24 Even if the uniform illumination plate 30 is formed such that the recesses 28 become larger as the distance from the good. In this example, the vicinity of the end face 24 is affected by the light reflected by the reflecting mirror 26. Since sufficient scattered light can be obtained by The recess 28a at the lower position is the largest. According to this uniform illumination plate 30 The light transmitted through the light guide plate 12 and emitted from the end face 24 is guided again by the reflecting mirror 26. Since the light is made incident on the light body plate 12, the light irradiated onto the end face 16 is not effectively diffused. It will be done. In this way, in this example, the distance from the two end surfaces 16 and 24 of the light guide plate 12 is A recess of this size is formed.

[0018] Also, although not shown, the back surface of the light guide plate, that is, the surface opposite to the surface on which the recess is formed. It is also possible to place a reflective plate on the opposite surface or plate it with silver, chrome, etc. stomach. Here, the reflector referred to in the present invention generally includes reflectors made of these plating layers, etc. It's just a thought. In these cases, the light that is scattered by the recess and emitted from the back surface is regenerated. The light is incident on the light guide plate and emitted from its surface, resulting in even brighter scattered light. You can get light. Furthermore, a recess may also be formed on the back surface, and the light guide plate may be formed with a recess. In either case, it is sufficient if a recess is formed on the surface.

[0019] Further, as shown in FIG. 4, two opposing end surfaces 16 and 24 of the light guide plate 12 The recess 32 is formed to become larger as the distance from the center of the light guide plate 12 increases. The uniform illumination plate 34 may have the largest recess 32a. This uniform lighting board 34 has light sources 18 and 36 such as fluorescent tubes arranged near both end faces 16 and 24, respectively. When used, both end surfaces 16 and 24 are irradiated with light. Also, illustrations are omitted. Although this is omitted, the recesses are formed larger as they get farther from the end face of the three or four locations. It's okay. In these cases, light sources should be placed near the end faces of those three or four locations. Good.

[0020] On the other hand, the shape of the recess may not be a truncated cone, but a cone, pyramid, hemisphere, or paraboloid of revolution. It may be shaped like a columnar shape, a columnar shape, or a prismatic shape, and is not limited in any way. For example, triangle If the recess is conical, as shown in FIG. A recess 38 may be formed so that the light is incident only on the surface, or as shown in FIG. The structure is formed so that the transmitted light 37 shown by the arrow is uniformly incident on two surfaces of the triangular pyramid. It's okay if it's done. As is clear from this example, the direction is not limited in any way. stomach. Furthermore, as shown in FIGS. 7 and 8, in the case of the quadrangular pyramid-shaped recess 40, the triangular pyramid-shaped recess is also used. As in the case of point 38, it may be formed in any direction. Furthermore, hemispherical and If the recess forms a paraboloid of revolution, the light is refracted by the recess and emitted to the outside. The direction of the light is different for each part of the recess where the light enters, making it possible to obtain sufficiently diffused light. can be done. Furthermore, the recesses may be formed in various directions, or It may be formed by a mixture of recesses of different shapes, or it may be conical or pyramidal. The angle of the recess, such as the shape, can be set arbitrarily.

[0021] The light guide plate in the uniform illumination plate detailed above is composed of approximately parallel flat plates. However, as shown in FIG. 9, the surface opposite to the surface where the recess 42 is formed is The thickness of the surface 44 becomes thinner as it gets farther from the end surface 46 where the light source is disposed. The uniform illumination plate 50 may be configured by the light guide plate 48 that is inclined. In this example A reflector is provided on the inclined surface 44 to focus the light incident from the light source. It is also possible to configure both of them to be reflected by a reflecting plate.

[0022] Further, as shown in FIG. 10, the surface side of the light guide plate 52 where the recess 42 is not formed The vicinity of the end face 46 where the light source is disposed is formed by parallel planes. In addition, the slope is increased as the distance from the point where the transmitted light is attenuated increases. It may also be formed by an oblique surface 54. In addition, in this example, as shown in the figure, The slanted surface 54 is formed in a step-like manner, and the stepped slanted surface 54 reflects the transmitted light. It is also possible to configure it so that the light is emitted and diffused. In this case, 54 parts of the inclined surface It is preferable to form a reflective plate by plating or the like.

[0023] Above, various explanations have been given regarding the uniform illumination plate according to the present invention. A uniform illumination device using a plate will be explained. Note that the uniform illumination device used The illumination plate may be any of those shown in the above embodiments and is not limited in any way.

[0024] As shown in FIG. 11, the uniform illumination device 56 includes a uniform illumination plate 10 and the uniform illumination plate 10. a linear light source 58, such as a fluorescent tube, disposed close to the end surface 16 of 10; A mirror disposed on the opposite side of the surface of the uniform illumination plate 10 on which the recess 14 is formed. and a shooting plate 60, which are housed in a frame (not shown). Kaka In the uniform illumination device 56 shown in FIG. a reflecting plate 6 for guiding the covered light to the light guide plate 12 of the uniform illumination plate 10; 2, and transmits light diffused from the surface where the recesses 14 of the uniform illumination plate 10 are formed. from a milky white resin plate or frosted glass to obtain a uniform and even light distribution. It is also possible to provide a diffuser plate 64 that is similar to the above. Note that this diffuser plate 64 provides uniform illumination. It may be arranged close to the plate 10, but highly uniform illuminance distribution is required. If so, they may be placed with some spacing between them.

[0025] In addition, as shown in FIG. 12, the uniform illumination plate 10 is The sides are arranged so that the reflecting plate 62 faces each other, and the light from the light source 58 is directed to the light guide plate 12. The light is then refracted at the recess 14 and diffused to the outside, and the diffused light is further reflected by a reflector. 62 and transmits the light to the light guide plate 12, and the light is transmitted to the outside from the opposite surface. The uniform illumination device 66 may be configured to diffuse the light. You can configure it like this As a result, the illuminance distribution of the light emitted from the uniform illumination device 66 becomes almost uniform. In addition, by further providing a diffuser plate 64, a uniform illumination device 6 with no uneven illuminance distribution can be achieved. 6 is obtained. Note that the reflector plate 62 shown in these embodiments is a mirror-finished metal plate. Alternatively, it may be directly attached to the surface of the light guide plate 12 by plating or the like. It may be formed by adhesion.

[0026] Although the embodiments of the present invention have been described above, the uniform illumination plate or uniform illumination plate according to the present invention The light device can be implemented in various combinations, and in addition, the light guide plate The present invention is based on the knowledge of those skilled in the art without departing from the spirit of the invention, such as that the shape may be circular. The present invention can be implemented with various improvements, modifications, and variations based on knowledge.

[0027]

[Effect of the idea]

The uniform illumination plate according to the present invention has a light guide plate made of a light-transmitting material that is placed far from the end face of the light guide plate. Indeed, since a large recess is formed, the light irradiated on the end face is reflected as a whole. It is possible to uniformly and evenly illuminate advertising media and the like. death It has a simple structure, so it can be manufactured easily and is an inexpensive uniform lighting board. can be provided.

[0028] In addition, a uniform illumination device constructed using such a uniform illumination plate is thin and has no thickness. Because there is no such thing, the selection of possible installation locations is expanded.

[Brief explanation of drawings]

FIG. 1 is an explanatory view showing an embodiment of a uniform illumination plate according to the present invention, (a) is an explanatory cross-sectional end view taken along the A-A line shown in (b), and (b) is an explanatory plan view. .

FIG. 2 is an explanatory plan view showing another embodiment of the uniform illumination plate according to the present invention.

FIG. 3 is an explanatory view showing an embodiment of the uniform illumination plate according to the present invention, (a) is an explanatory cross-sectional end view taken along the A-A line shown in (b), and (b) is an explanatory plan view. .

FIG. 4 is an explanatory diagram showing an embodiment of the uniform illumination plate according to the present invention, in which (a) is a cross-sectional end view taken along line A-A shown in (b);
(b) is an explanatory plan view.

FIG. 5 is an explanatory diagram showing another embodiment of the recess in the uniform illumination plate according to the present invention.

FIG. 6 is an explanatory diagram showing another embodiment of the recess in the uniform illumination plate according to the present invention.

FIG. 7 is an explanatory diagram showing another embodiment of the recess in the uniform illumination plate according to the present invention.

FIG. 8 is an explanatory diagram showing another embodiment of the recess in the uniform illumination plate according to the present invention.

FIG. 9 is an explanatory cross-sectional end view showing another embodiment of the uniform illumination plate according to the present invention.

FIG. 10 is an explanatory cross-sectional end view showing still another embodiment of the uniform illumination plate according to the present invention.

FIG. 11 is an explanatory cross-sectional end view showing an embodiment of the uniform illumination device according to the present invention.

FIG. 12 is an explanatory cross-sectional end view showing another embodiment of the uniform illumination device according to the present invention.

FIG. 13 is an explanatory diagram showing an example of a conventional uniform illumination plate, in which (a) is a cross-sectional end view taken along line A-A shown in (b);
(b) is an explanatory plan view.

[Explanation of symbols]

10, 22, 30, 34, 50; uniform illumination plate 12, 48, 52; light guide plate 14, 20, 28, 32, 38, 40, 42; recess 16, 24, 46; end face 18, 36, 58; light source 56, 66; uniform illumination device 60; Reflector

Claims (3)

[Scope of utility model registration request] 1. A uniform light guide plate, characterized in that a recess is formed on at least one surface of a light guide plate made of a translucent material, the recesses increasing as the distance from one or more end faces of the light guide plate increases. lighting board. 2. The uniform illumination plate according to claim 1, wherein the recesses are arranged in a grid pattern or a staggered pattern. 3. The uniform illumination plate according to claim 1 or 2, a linear light source disposed close to one or more end surfaces of the uniform illumination plate, and the uniform illumination plate. A uniform illumination device characterized by comprising a reflector plate disposed on one surface side of the plate.