Lighting device

• US 8,033,692 B2
• Filed: 05/22/2007
• Issued: 10/11/2011
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Van De Ven, Antony Paul, Negley, Gerald H.
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US11/751,982
• Publication Number:
  US 20070274080A1
• Time in Patent Office: 1,603 Days
• Field of Search: 362/341, 362/231, 362/255, 362/256, 362/293, 362/800, 362/84, 257/432, 257 98-100, 313/498, 313/501, 313/502, 313/512
• US Class Current: 362/341
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• 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 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/60 Reflective elements
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A first lighting device comprises at least one plural cavity element and a plurality of solid state light emitters. A second lighting device comprises at least one plural cavity element, a plurality of solid state light emitters and at least one encapsulant region, at least a portion of the plural cavity element being surrounded by the encapsulant region. Each plural cavity element has at least two optical cavities. Each optical cavity comprises a concave region in the plural cavity element. At least one solid state light emitter is present in each of at least two of the optical cavities.

Claims

1. A lighting device comprising:

at least one plural cavity element, said plural cavity element having at least two optical cavities, each of said optical cavities comprising a concave region in said plural cavity element;

a plurality of solid state light emitters, at least one of said solid state light emitters present in each of at least two of said optical cavities; and

an encapsulant region, said plural cavity element completely surrounded by said encapsulant region.

2. A lighting device as recited in claim 1, wherein walls of each of said optical cavities are reflective.

3. A lighting device as recited in claim 1, wherein said plural cavity element comprises a first surface, said first surface substantially planar, said first surface having a surface area which is at least five times as large as a combined surface area of said solid state light emitters.

4. A lighting device as recited in claim 3, wherein each of said optical cavities formed in said plural cavity element comprises a substantially planar mounting surface on which at least one of said solid state light emitters is mounted.

5. A lighting device as recited in claim 1, wherein said plural cavity element comprises a first side and a second side, said first side comprising a substantially planar first surface and a plurality of substantially flat mounting surfaces, at least one of said solid state light emitters mounted on each of said mounting surfaces, each of said mounting surfaces substantially coplanar, said first surface and said mounting surfaces together comprising not less than 75% of a surface area of said first side of said plural cavity element.

6. A lighting device as recited in claim 1, wherein at least one broad spectrum solid state light emitter is provided in a first of said optical cavities and at least one narrow spectrum solid state light emitter is provided in a second of said optical cavities.

7. A lighting device as recited in claim 1, further comprising at least one scattering element.

8. A lighting device as recited in claim 1, further comprising at least one scattering element, said scattering element included in said encapsulant region.

18. A lighting device as recited in claim 1, wherein if each of said plurality of solid state light emitters is illuminated, mixed light exiting said encapsulant region would, in the absence of any additional light, have x, y coordinates on a 1931 CIE Chromaticity Diagram which define a point which is within twenty MacAdam ellipses of at least one point on the blackbody locus on a 1931 CIE Chromaticity Diagram.

9. A lighting device comprising:

at least one plural cavity element, said plural cavity element having at least two optical cavities, each of said optical cavities comprising a concave region in said plural cavity element;

a plurality of solid state light emitters, at least one of said solid state light emitters present in each of at least two of said optical cavities; and

at least one encapsulant region, at least a portion of said plural cavity element surrounded by said encapsulant region,

wherein if each of said plurality of solid state light emitters is illuminated, light exiting said encapsulant region which was emitted from said plurality of solid state light emitters would be at least 80% mixed.

10. A lighting device as recited in claim 9, wherein said plural cavity element is completely surrounded by said encapsulant region.

11. A lighting device as recited in claim 9, further comprising at least one scattering element.

12. A lighting device as recited in claim 11, wherein said scattering element is included in said encapsulant region.

13. A lighting device as recited in claim 9, wherein walls of each of said optical cavities are reflective.

14. A lighting device as recited in claim 9, wherein said plural cavity element comprises a first surface, said first surface substantially planar, said first surface having a surface area which is at least five times as large as a combined surface area of said solid state light emitters.

15. A lighting device as recited in claim 14, wherein each of said optical cavities formed in said plural cavity element comprises a substantially planar mounting surface on which at least one of said solid state light emitters is mounted.

16. A lighting device as recited in claim 9, wherein said plural cavity element comprises a first side and a second side, said first side comprising a substantially planar first surface and a plurality of substantially flat mounting surfaces, at least one of said solid state light emitters mounted on each of said mounting surfaces, each of said mounting surfaces substantially coplanar, said first surface and said mounting surfaces together comprising not less than 75% of a surface area of said first side of said plural cavity element.

17. A lighting device as recited in claim 9, wherein at least one broad spectrum solid state light emitter is provided in a first of said optical cavities and at least one narrow spectrum solid state light emitter is provided in a second of said optical cavities.