Light emitting device, and illumination apparatus and luminaire using same

• US 9,169,994 B2
• Filed: 03/11/2013
• Issued: 10/27/2015
• Est. Priority Date: 03/12/2012
• Status: Expired due to Fees

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Tanaka, Kenichiro
• Primary Examiner(s): DZIERZYNSKI, EVAN P
• Application Number:
  US13/792,594
• Publication Number:
  US 20130235555A1
• Time in Patent Office: 960 Days
• Field of Search: 362/84, 362/235, 362/230
• US Class Current: 1/1
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 3/08 the material comprising photoluminescent substances
• CPC Class Codes: F21V 3/12 the coatings comprising photoluminescent substances
• CPC Class Codes: F21V 9/38 Combination of two or more photoluminescent elements of different materials
• CPC Class Codes: F21Y 2113/17 forming a single encapsulated light source
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/45124 Aluminium (Al) as principal constituent
• CPC Class Codes: H01L 2224/45139 Silver (Ag) as principal constituent
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/45147 Copper (Cu) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 24/45 of an individual wire connector
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• 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 33/504 Elements with two or more wavelength conversion materials
• CPC Class Codes: H01L 33/507 the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body

Abstract

A light emitting device including multiple kinds of light emission units with different emission colors; a driver which drives the light emission units; and a cover member which is commonly provided for the multiple kinds of light emission units. The multiple kinds of light emission units include solid state light emitting elements of the same kind, and wavelength converters which cover the solid state light emitting elements, respectively, and convert wavelengths of lights emitted from the solid state light emitting elements into different wavelengths from each other. Further, the cover member contains a correction phosphor for correcting a chromaticity of light obtained by mixing lights emitted from the light emission units, to a predetermined chromaticity.

Claims

1. A light emitting device comprising:

a plurality of light emission groups, each of the light emission groups including multiple kinds of light emission units with different emission colors;

a driver which drives the light emission units in said each of the light emission groups; and

a plurality of cover members detachable from each other, each of the cover members corresponding to one of the light emission groups,

wherein each of the cover members is commonly provided for the multiple kinds of light emission units in said one of the light emission groups,

wherein the multiple kinds of light emission units in said each of the light emission groups include solid state light emitting elements of the same kind, and wavelength converters which cover the solid state light emitting elements, respectively, and convert wavelengths of lights emitted from the solid state light emitting elements into different wavelengths from each other,

wherein said each of the cover members contains a correction phosphor for correcting a chromaticity of light obtained by mixing lights emitted from the light emission units in said one of the light emission groups, to a predetermined chromaticity

wherein each of the wavelength converters includes;

a bowl-shaped member formed of silicone resin; and

a solid material filling a concave portion of the bowl-shaped member, and

wherein the bowl-shaped member and the solid material are in close contact with each other, and

wherein the solid material has a refractive index which is identical to a refractive index of the bowl-shaped member.

2. The light emitting device of claim 1, wherein the multiple kinds of light emission units in said each of the light emission groups include a red light emission unit configured to emit red light, a green light emission unit configured to emit green light, and a blue light emission unit that emits configured to emit blue light, and are grouped to obtain a white light by mixing lights emitted from the red light emission unit, the green light emission unit and the blue light emission unit, and

wherein the correction phosphor of said each of the cover members is configured to correct a chromaticity of the white light emitted from said one of the light emission groups to a single predetermined chromaticity.

3. The light emitting device of claim 2, wherein the correction phosphor of said each of the cover members corrects a chromaticity of the white light obtained when the solid state light emitting elements in said one of the light emission groups are driven with a rated output by the driver, to a desired chromaticity.

4. The light emitting device of claim 3, wherein said each of the cover members further includes a resin mold having a light transmissivity, and a phosphor sheet which is attached to the resin mold and contains the correction phosphor.

5. An illumination apparatus using the light emitting device described in claim 4.

6. A luminaire including the light emitting device described in claim 4.

7. An illumination apparatus using the light emitting device described in claim 3.

8. A luminaire including the light emitting device described in claim 3.

9. The light emitting device of claim 2, wherein said each of the cover members further includes a resin mold having a light transmissivity, and a phosphor sheet which is attached to the resin mold and contains the correction phosphor.

10. An illumination apparatus using the light emitting device described in claim 9.

11. A luminaire including the light emitting device described in claim 9.

12. An illumination apparatus using the light emitting device described in claim 2.

13. A luminaire including the light emitting device described in claim 2.

14. The light emitting device of claim 1, wherein said each of the cover members further includes a resin mold having a light transmissivity, and a phosphor sheet which is attached to the resin mold and contains the correction phosphor.

15. An illumination apparatus using the light emitting device described in claim 14.

16. A luminaire including the light emitting device described in claim 14.

17. An illumination apparatus using the light emitting device described in claim 1.

18. A luminaire including the light emitting device described in claim 1.

19. The light emitting device of claim 1, wherein the solid material is formed by filling and curing a resin in the concave portion of the bowl-shaped member.