JP2004111189A - Light guide plate device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light guide plate device which can be manufactured easily and with which large quantity of light can be obtained. <P>SOLUTION: The light guide plate device has light sources 4 as light emitting diodes or the like on its back surface facing two adjacent tilted planes 2 and 3 of a light guide plate 1 whose front view is approximately rectangular and whose cross sections in two directions that are orthogonal each other are approximately parallelograms. Upsizing is realized by arranging the light guide plate devices in a form of matrix. It is preferable that other two tilted planes 5 and 6 of the light guide plate 1 have rough surfaces. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a light guide plate device suitable for upsizing.
[0002]
[Prior art]
The larger the light guide plate is, the more difficult it is for light incident on the light guide plate to reach a distant place. Therefore, it has been proposed to configure a large light guide plate device by combining a plurality of light guide plates (Patent Document 1). reference).
[0003]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-42537
[Problems to be solved by the invention]
However, it should be noted that in Patent Literature 1, since the light introducing portion protrudes in the direction of the back surface of the light guide plate, there are problems to be solved such as difficulty in manufacturing and a small amount of light. An object of the present invention is to provide a light guide plate device which is easy to manufacture and can obtain a large amount of light in view of the problems to be solved.
[0005]
[Means for Solving the Problems]
To summarize the present invention, a light guide plate device in which a light source is disposed on a back surface opposed to two adjacent inclined surfaces of a light guide plate having a front surface having a substantially rectangular shape and a cross section in two directions orthogonal to each other having a substantially parallelogram shape, respectively. It is. Further, such a light guide plate device can be arranged in a matrix to form a large light guide plate device. Further, it is preferable that the other two inclined surfaces of the light guide plate are rough surfaces.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, an embodiment of the present invention will be described. However, it is an exemplary embodiment adopted based on the present invention, and the present invention should not be interpreted in a limited manner based on matters specific to the embodiment. Instead, the technical scope of the present invention should be determined on the basis of the matters stated in the claims and matters substantially equivalent to the matters.
[0007]
In the embodiment of FIGS. 1 to 4, the front surface has a substantially rectangular shape, and the cross section in two directions perpendicular to each other has a substantially parallelogram shape. This is a light guide plate device on which a light source 4 such as a light emitting diode is arranged. The light guide plate devices are arranged in a matrix to achieve a large size. Further, it is preferable that the other two inclined surfaces 5 and 6 of the light guide plate 1 are rough surfaces.
[0008]
The light guide plate 1 is formed of a transparent resin, and a plurality of vertical and horizontal concave streaks 7 are formed on the back surface of the light guide plate 1, for example. Is diffusely reflected toward the front. As shown in FIG. 4, a concave portion 10 may be provided on the back surface of the light guide plate 1, and the light source 4 may be positioned in the concave portion 10. Of course, it may be arranged. Although a part of the light from the light source 4 is emitted to the front surface through the inclined surface 2 or 3, since the adjacent light guide plate 1 has the rough surface 5 or 6 facing the inclined surface 2 or 3, The bright line can be prevented from being seen from the surface side. Further, the rough surface 5 or 6 diffuses the light in the light guide plate 1 to be reflected at the interface toward the front surface, and also prevents the light from being seen as a bright line from the surface side.
[0009]
Next, in FIG. 5, the direction of the light source 4 is the plate surface direction of the light guide plate 1. In FIGS. 4 and 5, reference numeral 8 denotes a substrate on which the light source 4 is mounted, and reference numeral 9 denotes a light-transmitting light diffusing plate disposed on the surface of the light guide plate 1 as necessary.
[0010]
According to the present embodiment, since the shape of the light guide plate 1 is not easily complicated, manufacturing is easy, and the light source 4 can be arranged on two adjacent sides, so that a light guide plate device capable of obtaining a large amount of light can be provided.
[Brief description of the drawings]
FIG. 1 is a schematic perspective view of a light guide plate showing an embodiment of the present invention. FIG. 2 is a detailed front view of the light guide plate. FIG. 3 is a front view of a state where a plurality of the light guide plates are combined. FIG. Sectional view showing another embodiment of the present invention.
DESCRIPTION OF SYMBOLS 1 Light guide plate 2, 3 Inclined surface 4 Light source 5, 6 Inclined surface

Claims (3)

A light guide plate device in which a light source is disposed on a back surface facing two adjacent inclined surfaces of a light guide plate having a substantially rectangular front surface and a cross section in two directions orthogonal to each other having a substantially parallelogram shape. A light guide plate device in which the light guide plate devices according to claim 1 are arranged in a matrix. 3. The light guide plate device according to claim 1, wherein the other two inclined surfaces of the light guide plate are roughened.

Images