JP2003057446A - Light guide plate device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve intensity of emitted light. SOLUTION: The light guide plate device is provided with a light source 1 such as a light emitting diode, and a light guide plate 6 made of a transparent acrylic resin which introduces the light 2 of a light source 1 from an introduction surface 3, reflects the light on a reflective surface 4 having a large number of fine ruggedness etc., and externally emits the light from an emission surface 5. In the light guide plate 6, a space 7 is formed in the vicinity of the introduction surface 3, a convex surface 8 such as an almost circular arc surface which refracts the introduced light 2 near the reflective surface 4, is formed on the surface at the light source 1 side of the space 7, and the surface of the space 7 at the side opposite to the light source 1 is made into a vertical surface 9. When the light source 1 is a point light source, the space 7 is formed almost sectorially in plane view so as to surround the light source 1, thereby to locate the space 7 in a large portion of passages of the light 2 emitted with directivity from the light source 1 and.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a light guide plate device.

[0002]

2. Description of the Related Art A light guide plate device provided with a light source and a light guide plate, into which light from the light source is introduced from an introduction surface, reflected by a reflection surface, and emitted to the outside from an emission surface, is well known. .

[0003]

However, it should be noted that there is often a problem to be solved that the emitted light is weak because some of the introduced light is difficult to reach the reflecting surface. . The present invention has been made in view of such problems to be solved, and an object thereof is to improve radiant light intensity.

[0004]

According to the present invention, there is provided a light source, and a light guide plate in which light from the light source is introduced from an introduction surface, reflected by a reflection surface, and emitted from the emission surface to the outside. An air gap is formed in the optical plate in the vicinity of the introduction surface, and a convex surface that refracts the introduced light toward the reflection surface is formed on the light source side surface of the air gap, and the air gap side opposite to the light source side is upright. It is a light guide plate device having a surface. Further, when the light source is a point light source, it is preferable that the void is formed in a fan shape in plan view so as to surround the light source.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Next, an embodiment of the present invention will be described, but it is merely an exemplary embodiment adopted based on the present invention, and the present invention is based on matters peculiar to the embodiment. However, the technical scope of the present invention should be determined based on the matters shown in the claims and the matters substantially equivalent to the matters.

In the embodiment shown in FIGS. 1 to 3, the light source 1 such as a light emitting diode and the light 2 of the light source 1 are reflected by the reflecting surface 4 having a large number of fine irregularities after being introduced from the introducing surface 3. And a light guide plate 6 such as a transparent acrylic resin that is radiated from the radiation surface 5 to the outside. Then, the light guide plate 6
In the above, a void 7 is formed in the vicinity of the introduction surface 3, and a convex surface 8 such as a substantially arc surface that refracts the introduced light 2 toward the reflection surface 4 is formed on the surface of the void 7 on the light source 1 side. The surface of the void 7 on the side opposite to the light source 1 is an upright surface 9. Further, when the light source 1 is a point light source, the air gap 7 surrounds the light source 1 so that the air gap 7 is positioned in the path of most of the light 2 radiated from the light source 1 with a directivity. Has been formed.

According to the present embodiment, since the introduced light 2 can be refracted by the convex surface 8 toward the reflecting surface 4, the amount of light that hits the reflecting surface 4 is increased, so that the light is emitted from the emitting surface 5. The intensity of the generated light is surely improved, and a bright light guide plate device is obtained. Further, the light 2 introduced into the light guide plate 6 is likely to be diffused by passing through the interface between the gap 7 and the light guide plate 6, so that the light guide plate 6 is effective in illuminating as uniformly as possible.

FIG. 4 showing another embodiment is of a type in which the reflecting surface 4 is inclined in the light guide plate 6, but in this case as well, as in the case of FIGS. Is increased and the intensity of light emitted from the emission surface 5 is surely improved, and a bright light guide plate device can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a cross-sectional view showing another embodiment of the present invention.

[Explanation of symbols]

1 light source 2 light 3 Introduction 4 Reflective surface 5 Radiating surface 6 Light guide plate 7 void 8 convex 9 upright

Claims (2)

[Claims] 1. A light source, and a light guide plate, into which light from the light source is introduced from an introduction surface, reflected by a reflection surface, and emitted from the emission surface to the outside. The light guide plate is provided in the vicinity of the introduction surface. A light guide plate device in which a void is formed and a convex surface for refracting the introduced light toward the reflection surface is formed on a surface of the void on the light source side, and a surface of the void on the side opposite to the light source is an upright surface. 2. The light guide plate device according to claim 1, wherein when the light source is a point light source, the air gap is formed in a fan shape in plan view so as to surround the light source.