PLANAR LIGHT SOURCE DEVICE

• US 20110069510A1
• Filed: 09/27/2010
• Published: 03/24/2011
• Est. Priority Date: 03/31/2008
• Status: Abandoned Application

• Current Assignee: Kuraray Company Limited, Sanken Electric Company Limited
• Original Assignee: Kuraray Company Limited, Sanken Electric Company Limited
• Inventors: YAMASHITA, Toyomi, Soga, Yasunori, Hoshino, Masanori, Mukoo, Yoshiki, Kimura, Kengo, Fukuda, Iichiro
• Application Number:
  US12/891,253
• Publication Number:
  US 20110069510A1
• Time in Patent Office: Days
• US Class Current: 362/612
• CPC Class Codes: G02B 6/0085 Means for removing heat created by the light source from the package heat extraction or cooling elements for semiconductor light sources in general H01L33/64
• CPC Class Codes: G02B 6/0091 of the light source relative to the light guide G02B6/0021 takes precedence

Abstract

A planar light source device (1) is provided with a light source unit (4B) wherein a semiconductor light-emitting element (43) is covered with a transparent resin part (44); a light guide body (3) having a side surface (3B) facing the light source unit (4B); and a holding body (5B), which has the light source unit (4B) fixed on one side and the light guide body (3) on the other side, and a space between a transparent resin part (44) and the side surface (3B), and connects the light source unit (4B) and the light body (3). The light source unit (4B) moves with extension and retraction of the light guide body (3). The holding body (5B) holds a distance constant between the transparent resin part (44) of the light source unit (4B) and the side surface (3B) of the light guide body (3) to extension and retraction of the light guide body (3).

Claims

1. A planar light source device comprising:

a light source unit;

a light guide body which guides light of the light source unit irradiated from a side surface to a front surface; and

a support body fixed with the light source unit on one side and fixed with the light source unit on another side;

wherein

a distance between a light emitting surface of the light source unit and the surface of the light guide body is maintained constantly with respect to stretching of the light guide body in a side surface direction.

2. The planar light source device defined in claim 1, wherein a semiconductor light-emitting element of the light source unit is covered with a transparent resin part and the support body is formed to maintain a gap between the transparent resin part and the side surface.

10. The planar light source device defined in claim 1, wherein a linear expansion coefficient of the support body is the same as a liner expansion coefficient of the light guide body.

12. The planar light source device defined in claim 1, wherein fixing of the support body and the light guide body is performed by interlocking of a projection arranged on either the support body or the light guide body, and a hole arranged on the other.

3. A planar light source device comprising:

a light source unit in which a semiconductor light-emitting device is covered with a transparent resin part;

a light guide body having a side surface which faces the transparent resin part of the light source unit;

a support body fixed with the light source unit on one side and fixed with the light guide body on another side and which links the light source unit and the light guide body; and

a chassis arranged on the exterior side of the light source unit and light guide body and which includes an interior surface which faces a light output surface of the light guide body,

wherein a gap is arranged between the opposite side of the light source unit and the chassis so that the light source unit and the light guide body are not in contact and movable.

4. The planar light source device defined in claim 3, further comprising:

a dissipater fixed to the light source unit and wherein one end is thermally in contact with a main surface of the chassis having an interior surface facing the light output surface, and the other end is thermally in contact with the light source unit.

5. The planar light source device defined in claim 3, wherein the light guide body and the support body are fixed by the light output surface of the light guide body or the center of a back surface which faces this light output surface.

6. The planar light source device defined in claim 4, wherein the light guide body and the support body are fixed by the light output surface of the light guide body or the center of a back surface which faces this light output surface.

7. The planar light source device defined in claim 3, further comprising:

a display panel which faces the light output surface of the light guide body;

wherein

the support body sandwiches both surfaces of at least one part of the light output surface of the light guide body and at least one part of a back surface which faces the light output surface in a non effective region of the display panel.

8. The planar light source device defined in claim 4, further comprising:

a display panel which faces the light output surface of the light guide body;

wherein

the support body sandwiches both surfaces of at least one part of the light output surface of the light guide body and at least one part of a back surface which faces the light output surface in a non effective region of the display panel.

9. The planar light source device defined in claim 5, further comprising:

a display panel which faces the light output surface of the light guide body;

wherein

the support body sandwiches both surfaces of at least one part of the light output surface of the light guide body and at least one part of a back surface which faces the light output surface in a non effective region of the display panel.

11. The planar light source device defined in claim 3, wherein a linear expansion coefficient of the support body is the same as a liner expansion coefficient of the light guide body.

13. The planar light source device defined in claim 3, wherein fixing of the support body and the light guide body is performed by interlocking of a projection arranged on either the support body or the light guide body, and a hole arranged on the other.