Lighting device

• US 7,553,047 B2
• Filed: 01/09/2007
• Issued: 06/30/2009
• Est. Priority Date: 06/01/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Shin, Su-ho, Shin, Kyu-ho, Moon, Chang-youl
• Primary Examiner(s): O'Shea; Sandra L
• Assistant Examiner(s): APENTENG, JESSICA MCMILLAN
• Application Number:
  US11/651,064
• Publication Number:
  US 20080037226A1
• Time in Patent Office: 903 Days
• Field of Search: 362/294, 362/800, 362/373, 362/218, 362/264, 362/547, 361/720
• US Class Current: 362/294
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/713 in direct thermal and mechanical contact of each other to form a single system
• CPC Class Codes: F21V 29/74 with fins or blades
• 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: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 33/648 the elements comprising fluids, e.g. heat-pipes
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A lighting device is provided. The lighting device includes a light source, a light source supporting member which has a surface to which the light source is attached, and a heat sink on an opposite surface of the light source supporting member, for dissipating heat generated by the light source. In addition, the heat sink includes a heat transfer member which protrudes from the surface of the light source supporting member; a plurality of first fins which are spaced apart from each other at intervals in a length direction of the heat transfer member, and are arranged parallel to the light source supporting member; and a plurality of second fins which are spaced apart from each other at intervals, surround outer portions of the first fins, and are arranged perpendicularly to the light source supporting member.

Claims

1. A lighting device comprising:

a light source;

a light source supporting member which has a surface to which the light source is attached; and

a heat sink which dissipates a heat generated by the light source on an opposite surface of the light source supporting member,

wherein the heat sink comprises;

a heat transfer member which protrudes from the surface of the light source supporting member;

a plurality of first fins which are spaced apart from each other at intervals in a length direction of the heat transfer member, and are arranged parallel to the light source supporting member; and

a plurality of second fins which are spaced apart from each other at intervals, surround outer portions of the first fins, and are arranged perpendicularly to the light source supporting member.

2. The lighting device of claim 1, wherein the plurality of second fins are arranged in a radial direction with respect to the heat transfer member.

3. The lighting device of claim 2, wherein the second fins protrude beyond the outer edge of the light source supporting member.

4. The lighting device of claim 1, wherein the plurality of second fins protrude from the surface of the light source supporting member.

5. The lighting device of claim 1, wherein the heat sink is formed of one or more selected from Cu, Al, Mg, and Fe.

6. The lighting device of claim 1, wherein a connecting portion is formed on an end portion or an intermediate portion of the heat transfer member.

7. The lighting device of claim 1, wherein slots which improve ventilation are formed on the light source supporting member.

8. The lighting device of claim 1, wherein a width of a part of the second fin adjacent to the light source supporting member is larger than a width of a part of the second fin a distance from the light source supporting member.

9. The lighting device of claim 1, wherein the light source supporting member includes a reflective body which reflects a light emitted from the light source, on a surface of the light source supporting member.

10. The lighting device of claim 1, wherein the light source comprises a light emitting diode (LED).

11. The lighting device of claim 1, wherein the light source comprises a metal core printed circuit board (MCPCB) mounted on the light source supporting member, and a light emitting diode (LED) package mounted on the MCPCB.

12. The lighting device of claim 1, wherein the light source comprises a submount mounted on the light source supporting member, and a light emitting diode (LED) chip mounted on the submount.

13. The lighting device of claim 1, wherein each of the plurality of first fins is formed as a disk.

14. The lighting device of claim 13, wherein each of the plurality of second fins is formed as a rectangular plate.

15. The lighting device of claim 1, wherein each of the plurality of second fins is formed as a rectangular plate.