Lighting device and display device

• US 9,316,385 B2
• Filed: 01/19/2012
• Issued: 04/19/2016
• Est. Priority Date: 01/26/2011
• Status: Expired due to Fees

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Maeda, Yasutoshi
• Primary Examiner(s): Gramling, Sean
• Assistant Examiner(s): Wolford, Naomi M
• Application Number:
  US13/980,645
• Publication Number:
  US 20130301241A1
• Time in Patent Office: 1,552 Days
• Field of Search: 362/97.1
• US Class Current: 1/1
• CPC Class Codes: F21V 29/00 Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems lighting fixtures combined with outlets for air-treatment systems F24F13/078
• CPC Class Codes: G02F 1/1336 Illuminating devices
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/133607 the light controlling member including light directing or refracting elements, e.g. prisms or lenses
• CPC Class Codes: G02F 1/133628 with cooling means
• CPC Class Codes: G09F 13/04 Signs, boards or panels, illuminated from behind the insignia

Abstract

A backlight device (lighting device) (12) according to the present invention includes a chassis (14) having an opened section (14b), optical members (15) disposed to cover the opened section (14b) in the chassis (14), LEDs (light source) (17) disposed outside of the chassis (14), and lens members (light guide members) (20) disposed in such a structure as to penetrate the chassis (14), the lens members guiding the light from the LEDs (17) into the chassis (14). An LED housing chassis (light source housing member) (19) that stores therein the LEDs (17) is attached to the chassis (14).

Claims

1. An illumination device comprising:

a chassis that has an opened section;

an optical member disposed to cover the opened section of the chassis;

a light source disposed outside of the chassis;

a light guide member disposed in such a structure as to penetrate the chassis, the light guide member guiding light emitted from the light source into the chassis;

a light source housing member that stores the light source therein, the light source housing member being attached to the chassis,

wherein the light source housing member has a wall that divides an inner space thereof into a first space and a second space, the first space being on a side of the chassis, the second space being on a side opposite to the chassis, and

wherein the light source is attached to said wall so as to be located in the first space.

2. The illumination device according to claim 1, wherein the light source housing member has a first air hole and a second air hole, respectively, the first air hole opening toward an outside of the light source housing from the first space, the second air hole opening toward an outside of the light source housing from the second space.

3. The illumination device according to claim 2, further comprising a suction fan that blows air into the light source housing member from the outside through the first or second air hole.

4. The illumination device according to claim 3, further comprising a cooler that cools air that is blown by the suction fan.

5. The illumination device according to claim 2, further comprising an exhaust fan that blows air out from an inside of the light source housing member through the first or second air hole.

6. The illumination device according to claim 2, further comprising:

a light guide substrate attached to the wall so as to be located in the first space, the light guide substrate having a plurality of said light sources mounted thereon;

a first heat sink attached to the light source substrate; and

a second heat sink attached to the wall so as to be located in the second space.

7. The illumination device according to claim 6, wherein the second heat sink is disposed so as to match in position with the light source in a plan view.

8. The illumination device according to claim 1, wherein the chassis has a bottom part that faces the optical member that covers the opened section, and

wherein the light source housing member is disposed on said bottom part on a side opposite to the optical member.

9. The illumination device according to claim 8, further comprising a restricting member between respective opposing surfaces of the bottom part and said wall in the light source housing member, the restricting member setting a gap between said respective opposing surfaces.

10. The illumination device according to claim 1, further comprising an insulating member between the chassis and the light source housing member.

11. The illumination device according to claim 1, wherein the chassis has an insertion hole that is an opening through which the light guide member is inserted,

wherein a spacer is interposed between an edge of the insertion hole and the light guide member.

12. The illumination device according to claim 1, wherein the light guide member has a light guide part at one end located outside of the chassis and a diffusion lens part at another end located inside of the chassis, the light guide part guiding light from the light source toward said another end, the diffusion lens part diffusing light.

13. The illumination device according to claim 12, wherein the diffusion lens part is in a dome shape.

14. The illumination device according to claim 1, wherein the light source is an LED.

15. A display device, comprising:

the illumination device according to claim 1; and

a display panel displaying images by using light from the illumination device.