Lighting device

• US 8,226,270 B2
• Filed: 05/22/2008
• Issued: 07/24/2012
• Est. Priority Date: 05/23/2007
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Yamamoto, Shoji, Nakagawa, Hiroyasu, Sakaida, Shinya, Takahashi, Fujio, Hamaguchi, Ayanori
• Primary Examiner(s): Choi, Jacob Y
• Assistant Examiner(s): Luong, Henry
• Application Number:
  US12/451,596
• Publication Number:
  US 20100096992A1
• Time in Patent Office: 1,524 Days
• Field of Search: 315/112, 313/46, 362/6, 362/92, 362/126, 362/294
• US Class Current: 362/294
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21K 9/238 Arrangement or mounting of circuit elements integrated in the light source
• CPC Class Codes: F21V 17/12 by screwing
• CPC Class Codes: F21V 17/14 Bayonet-type fastening
• CPC Class Codes: F21V 17/16 by deformation of parts; Snap action mounting
• CPC Class Codes: F21V 19/0055 by screwing
• CPC Class Codes: F21V 23/002 Arrangements of cables or conductors inside a lighting device, e.g. means for guiding along parts of the housing or in a pivoting arm
• CPC Class Codes: F21V 23/006 the substrate being distinct from the light source holder
• CPC Class Codes: F21V 29/508 of electrical circuits
• CPC Class Codes: F21V 29/767 the planes containing the fins or blades having directions perpendicular to the light emitting axis
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/89 Metals
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2105/10 comprising a two-dimensional array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05B 45/30 Driver circuits
• CPC Class Codes: H05B 45/3574 Emulating the electrical or functional characteristics of incandescent lamps
• CPC Class Codes: H05B 45/56 involving measures to prevent abnormal temperature of the LEDs

Abstract

The lighting device includes: a heat radiating part provided with a cavity that accommodates a part of a plurality of drive circuit components driving a light source module; and a base part provided with a cavity that accommodates another part (e.g., a transistor) of the drive circuit components. Then, the drive circuit components are accommodated in the cavity of the heat radiating part and the cavity of the base part.

Claims

1. A lighting device, comprising:

an LED;

a drive section for driving the LED;

an accommodating part accommodating the drive section; and

a heat radiating part radiating heat from the LED and/or the drive section;

a base part to be connected to an external power supply; and

an insulating part insulating the heat radiating part from the base part,

wherein the accommodating part is tightly closed in at least a part of the heat radiating part, and

the insulating part has a heat radiating part holding cylinder holding the heat radiating part, a base part holding cylinder holding the base part and a linkage part linking the heat radiating part holding cylinder with the base part holding cylinder, wherein the heat radiating part holding cylinder, the base part holding cylinder and the linkage part are formed in one piece.

2. The lighting device according to claim 1,

wherein the accommodating part is formed by the heat radiating part and the insulating part.

3. The lighting device according to claim 2,

wherein the insulating part includes an attaching part to be attached to the heat radiating part, and

the insulating part is attached to the heat radiating part by the attaching part, thereby insulating the drive section from the heat radiating part.

4. The lighting device according to claim 3,

wherein the attaching part is a notch provided in the insulating part, and

the insulating part includes a prevention part for preventing communication between the drive section and the heat radiating part caused by the notch.

5. The lighting device according to claim 1,

wherein the heat radiating part comprises:

a heat radiation plate having one surface where the LED is mounted;

a fixed cylinder attached to the other surface of the heat radiation plate and provided with the accommodating part in an inside thereof; and

a heat radiation fin fixed to an outer side of the fixed cylinder.

6. The lighting device according to claim 1,

wherein the accommodating part forms a closed space where dust entering from the outside is shut off.

7. A lighting device, comprising:

an LED;

a drive section for driving the LED;

an accommodating part accommodating the drive section; and

a heat radiating part radiating heat from the LED and/or the drive section;

a base part to be connected to an external power supply; and

an insulating part insulating the heat radiating part from the base part,

wherein the accommodating part is provided close to the LED inside the heat radiating part, and

the insulating part has a heat radiating part holding cylinder holding the heat radiating part, a base part holding cylinder holding the base part and a linkage part linking the heat radiating part holding cylinder with the base part holding cylinder, wherein the heat radiating part holding cylinder, the base part holding cylinder and the linkage part are formed in one piece.

8. The lighting device according to claim 7,

wherein the accommodating part is formed by the heat radiating part and the insulating part.

9. The lighting device according to claim 8,

wherein the insulating part includes an attaching part to be attached to the heat radiating part, and

the insulating part is attached to the heat radiating part by the attaching part, thereby insulating the drive section from the heat radiating part.

10. The lighting device according to claim 9,

wherein the attaching part is a notch provided in the insulating part, and

the insulating part includes a prevention part for preventing communication between the drive section and the heat radiating part caused by the notch.

11. The lighting device according to claim 7,

wherein the heat radiating part comprises:

a heat radiation plate having one surface where the LED is mounted;

a fixed cylinder attached to the other surface of the heat radiation plate and provided with the accommodating part in an inside thereof; and

a heat radiation fin fixed to an outer side of the fixed cylinder.

12. The lighting device according to claim 7,

wherein the accommodating part forms a closed space where dust entering from the outside is shut off.