LINEAR LIGHT SOURCE DEVICE AND PLANAR LIGHT SOURCE DEVICE

• US 20130077344A1
• Filed: 07/20/2012
• Published: 03/28/2013
• Est. Priority Date: 09/27/2011
• Status: Active Grant

• Current Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Original Assignee: Toyoda Gosei Company Limited (Toyota Motor Corporation)
• Inventors: KOKUBU, Hideki, Ito, Yuhki
• Granted Patent: US 9,316,781 B2
• Time in Patent Office: Days
• US Class Current: 362/606
• CPC Class Codes: G02B 6/0068 Arrangements of plural sources, e.g. multi-colour light sources
• CPC Class Codes: G02B 6/0073 Light emitting diode [LED]
• CPC Class Codes: G02B 6/0083 Details of electrical connections of light sources to drivers, circuit boards, or the like

Abstract

A linear light source device comprises a wiring substrate in a rectangular shape and having a wiring pattern formed thereon, a plurality of light emitting elements arranged on the wiring substrate in a longitudinal direction of the wiring substrate and connected with the wiring pattern on the wiring substrate, and a sealing resin that seals the light emitting elements, wherein the linear light source device is to be arranged on a side surface of a light guiding plate to form a planar light source device, and an external connection terminal is arranged on a surface of the wiring substrate that is opposite to a surface of the wiring substrate where the light emitting element are arranged and in a central portion in the longitudinal direction of the wiring substrate, and connected with the wiring pattern.

Claims

1. A linear light source device which is to be arranged on a side surface of a light guiding plate to form a planar light source device, comprising:

a wiring substrate in a rectangular shape and having a wiring pattern formed thereon;

a plurality of light emitting elements arranged on the wiring substrate in a longitudinal direction of the wiring substrate and connected with the wiring pattern on the wiring substrate; and

a sealing resin that seals the light emitting elements;

wherein an external connection terminal is arranged on a surface of the wiring substrate that is opposite to a surface of the wiring substrate where the light emitting element are arranged and in a central portion in the longitudinal direction of the wiring substrate, and connected with the wiring pattern.

2. The linear light source device according to claim 1, further comprising:

reflectors configured as two parts having slope surfaces facing each other on one side and the other side in the longitudinal direction of the wiring substrate, respectively, and which are arranged separated from each other on the wiring substrate so that the single light emitting element or each of the plurality of light emitting elements is sandwiched by the two slope surfaces;

wherein the sealing resin is formed such that it buries a recession surrounded with the two slope surfaces and the surface of the wiring substrate where the light emitting elements are arranged.

3. A planar light source device, comprising:

a light guiding plate;

the linear light source device according to claim 1 and arranged on the side surface of the light guiding plate; and

a connector in contact with the external connection terminal of the linear light source device;

wherein the connector is anchored pressing the central portion in the longitudinal direction of the linear light source device to the light guiding plate side, and the external connection terminal and the connector are in contact with each other.

4. The planar light source device according to claim 3, wherein the connector includes a spring-shaped terminal.