Lighting device

• US 8,529,104 B2
• Filed: 09/15/2011
• Issued: 09/10/2013
• Est. Priority Date: 05/23/2006
• Status: Active Grant

• Current Assignee: Creeled Incorporated
• Original Assignee: CREE Incorporated (Wolfspeed, Inc.)
• Inventors: Negley, Gerald H., Van De Ven, Antony Paul
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US13/233,302
• Publication Number:
  US 20120018751A1
• Time in Patent Office: 726 Days
• Field of Search: 362/341
• 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;

at least two solid state light emitters, at least a first solid state light emitter in a first optical cavity and at least a second solid state light emitter in a second optical cavity, said first solid state light emitter comprising a first luminescent material, said second solid state light emitter comprising a second luminescent material, said first luminescent material differing from said second luminescent material, and

an encapsulant region, at least a portion of said plural cavity element outside said at least two optical cavities of said plural cavity element covered by said encapsulant region.

2. A lighting device as recited in claim 1, wherein:

said plural cavity element further comprises a third optical cavity,

at least a third solid state light emitter is in said third optical cavity, and

said third solid state light emitter is a narrow spectrum solid state light emitter.

3. A lighting device as recited in claim 1, wherein:

said first solid state light emitter comprises a first light emitting diode which emits light having a first wavelength range,

said second solid state light emitter comprises a second light emitting diode which emits light having a second wavelength range, and

said first wavelength range differs from said second wavelength range.

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

5. A lighting device as recited in claim 1, wherein:

said plural cavity element comprises a first surface,

said first surface is substantially planar, and

said first surface has a surface area which is at least five times as large as a combined surface area of said solid state light emitters.

6. A lighting device as recited in claim 1, wherein:

said plural cavity element comprises a first side and a second side,

said first side comprises a substantially planar first surface and a plurality of substantially flat mounting surfaces,

at least one of said solid state light emitters is mounted on each of said mounting surfaces,

said mounting surfaces substantially coplanar, and

said first surface and said mounting surfaces together comprise not less than 75% of a surface area of said first side of said plural cavity element.

7. A lighting device as recited in claim 1, wherein said plural cavity element is embedded in said encapsulant region.

8. 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; and

at least two solid state light emitters,

at least a first solid state light emitter in a first optical cavity and at least a second solid state light emitter in a second optical cavity, said first solid state light emitter comprising a broad spectrum luminescent material, said second solid state light emitter a narrow spectrum solid state light emitter whereby narrow spectrum light is emitted from said second optical cavity.

9. A lighting device as recited in claim 8, wherein said first solid state light emitter comprises a first light emitting diode which emits light having a first wavelength range,

said second solid state light emitter comprises a second light emitting diode which emits light having a second wavelength range, and

said first wavelength range differs from said second wavelength range.

10. A lighting device as recited in claim 8, wherein:

said plural cavity element further comprises a third optical cavity,

at least a third solid state light emitter is in said third optical cavity, and

said third solid state light emitter is a narrow spectrum solid state light emitter.

11. A lighting device as recited in claim 8, wherein walls of said optical cavities are reflective.

12. A lighting device as recited in claim 8, wherein:

said plural cavity element comprises a first surface,

said first surface is substantially planar, and

said first surface has a surface area which is at least five times as large as a combined surface area of said solid state light emitters.

13. A lighting device as recited in claim 8, wherein:

said plural cavity element comprises a first side and a second side,

said first side comprises a substantially planar first surface and a plurality of substantially flat mounting surfaces,

at least one of said solid state light emitters is mounted on each of said mounting surfaces,

said mounting surfaces are substantially coplanar, and

said first surface and said mounting surfaces together comprise not less than 75% of a surface area of said first side of said plural cavity element.

14. A lighting device as recited in claim 8, wherein:

said lighting device further comprises an encapsulant region, and

at least a portion of said plural cavity element is covered by said encapsulant region.

15. A lighting device as recited in claim 14, wherein said plural cavity element is embedded in said encapsulant region.

16. 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;

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

an encapsulant region,

said at least two solid state light emitters arranged electrically in parallel,

at least a portion of said plural cavity element outside said at least two optical cavities of said plural cavity element covered by said encapsulant region.

17. A lighting device as recited in claim 16, 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.

18. A lighting device as recited in claim 16, wherein:

said plural cavity element further comprises a third optical cavity,

at least a third solid state light emitter is in said third optical cavity, and

said third solid state light emitter is a narrow spectrum solid state light emitter.

19. A lighting device as recited in claim 16, wherein:

a first solid state light emitter comprises a first light emitting diode which emits light having a first wavelength range,

a second solid state light emitter comprises a second light emitting diode which emits light having a second wavelength range, and

said first wavelength range differs from said second wavelength range.

20. A lighting device as recited in claim 16, wherein:

said plural cavity element further comprises a third optical cavity,

at least a third solid state light emitter is in said third optical cavity, and

said third solid state light emitter is arranged electrically in parallel with said at least two solid state light emitters.