LIGHT EMITTING DEVICE

• US 20090065793A1
• Filed: 09/11/2007
• Published: 03/12/2009
• Est. Priority Date: 09/11/2007
• Status: Active Grant

• Current Assignee: Document Security Systems, Inc.
• Original Assignee: Avago Technologies ECBU IP Singapore Pte Limited (Broadcom, Inc.)
• Inventors: Leng, Tan Kheng, Jin, Lee Chiau, Chuan, Ng Keat, Ling, Oon Slang, Soon, Ong Klam, Hon, Lee Kee
• Granted Patent: US 7,652,297 B2
• Time in Patent Office: Days
• US Class Current: 257/98
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/52 Encapsulations
• CPC Class Codes: H01L 33/54 having a particular shape
• CPC Class Codes: H01L 33/60 Reflective elements

Abstract

A light emitting device is disclosed herein. An embodiment of the light emitting device comprises a substrate and a reflector extending from the substrate. The reflector forms a cavity in conjunction with the substrate. A light emitter is located in the cavity. At least one first recessed portion is located in the reflector, the at least one first recessed portion extends substantially axially around the reflector.

Claims

1. A light emitting device comprising:

a substrate;

a reflector extending from said substrate, said reflector forming a cavity in conjunction with said substrate;

a light emitter located in said cavity; and

at least one first recessed portion located in said reflector, said at least one first recessed portion extending substantially axially around said reflector.

2. The light emitting device of claim 1 and further comprising an encapsulant located in said cavity, wherein said encapsulant is also located in said at least one first recessed portion.

3. The light emitting device of claim 1, wherein said reflector has an upper portion and a lower portion, said lower portion being located proximate said substrate, said at least one first recessed portion being located proximate said upper portion.

4. The light emitting device of claim 1, wherein said reflector has an upper portion and a lower portion, said lower portion being located proximate said substrate, said at least one first recessed portion being located proximate said lower portion.

5. The light emitting device of claim 1 wherein said at least one first recessed portion is a notch bordered by a first wall and a second wall formed within said reflector.

6. The light emitting device of claim 1, wherein said light emitter is electrically connected to said substrate.

7. The light emitting device of claim 1, wherein said reflector comprises a slanted portion that intersects a platform, wherein said platform is located proximate said substrate;

and wherein said at least one recessed portion is located at the intersection of said slanted portion and said platform.

8. The light emitting device of claim 1, wherein said substrate comprises at least one recessed portion and wherein said light emitter is located on said at least one recessed portion.

9. The light emitting device of claim 8 and further comprising an adhesive located in said at least one recessed portion, said adhesive serving to bond said light emitter to said substrate.

10. The light emitting device of claim 1, wherein said reflector comprises:

a first wall extending substantially perpendicular to said substrate;

a first platform extending from said first wall;

a second wall extending from said first platform and facing said first wall, the space between said first wall and said second wall constituting one of said at least one recessed portions;

a second platform extending from said second wall toward the center of said light emitting device;

a slanted portion extending from said second platform toward said substrate; and

a third platform located on said substrate and intersecting said slanted portion;

wherein a second of said at least recessed portion is located at the intersection of said third platform and said slanted portion.

11. A light emitting device comprising:

a substrate;

a reflector extending from said substrate, said reflector forming a cavity in conjunction with said substrate;

a light emitter located in said cavity;

at least one first recessed portion located in said reflector, said at least one first recessed portion extending substantially axially around said reflector; and

at least one second recessed portion located in said substrate proximate said light emitter.

12. The light emitting device of claim 11 and further comprising an adhesive located in said at least one second recessed portion, said adhesive serving to bond said light emitter to said substrate.

13. The light emitting device of claim 11 and further comprising an encapsulant located in said cavity, wherein said encapsulant is also located in said at least one first recessed portion.

14. The light emitting device of claim 11, wherein said reflector has an upper portion and a lower portion, said lower portion being located proximate said substrate, said at least one first recessed portion being located proximate said upper portion.

15. The light emitting device of claim 11, wherein said reflector has an upper portion and a lower portion, said lower portion being located proximate said substrate, said at least one first recessed portion being located proximate said lower portion.

16. The light emitting device of claim 11 wherein said at least one first recessed portion is a notch bordered by a first wall and a second wall formed within said reflector.

17. A light emitting device comprising:

a substrate;

a reflector extending from said substrate, said reflector forming a cavity in conjunction with said substrate, said reflector comprising;

a first wall extending substantially perpendicular to said substrate;

a first platform extending from said first wall;

a second wall extending from said first platform and facing said first wall, the space between said first wall and said second wall constituting a first recessed portion;

a second platform extending from said second wall toward the center of said light emitting device;

a slanted portion extending from said second platform toward said substrate; and

a third platform located on said substrate and intersecting said slanted portion;

wherein a second recessed portion is located at the intersection of said third platform and said slanted portion;

a light emitter located in said cavity; and

at least one third recessed portion located in said substrate proximate said light emitter.

18. The light emitting device of claim 17 and further comprising an adhesive located in said at least one third recessed portion, said adhesive serving to bond said light emitter to said substrate.

19. The light emitting device of claim 17 and further comprising an encapsulant located in said cavity.