LIGHTING DEVICE AND METHOD OF MAKING

• US 20090184616A1
• Filed: 10/09/2008
• Published: 07/23/2009
• Est. Priority Date: 10/10/2007
• Status: Active Grant

• Current Assignee: IDEAL Industries Lighting, LLC (Ideal Industries Incorporated)
• Original Assignee: Cree Lighting Company (Ideal Industries Incorporated)
• Inventors: VAN DE VEN, Antony Paul, NEGLEY, Gerald H.
• Granted Patent: US 8,018,135 B2
• Time in Patent Office: Days
• US Class Current: 313/1
• CPC Class Codes: F21K 9/233 specially adapted for generating a spot light distribution, e.g. for substitution of reflector lamps
• CPC Class Codes: F21V 23/0457 the sensor sensing the operating status of the lighting device, e.g. to detect failure of a light source or to provide feedback to the device
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• 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 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 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H05B 45/20 Controlling the colour of the light
• CPC Class Codes: H05B 45/28 using temperature feedback

Abstract

A lighting device comprising at least one non-white light source, at least a first supplemental light emitter and at least a second supplemental light emitter. The non-white light source(s) is outside an area from 0.01 u′v′ above to below the blackbody locus, and within an area defined by curves between saturated light of wavelength 430-480 nm and 560-580 nm and line segments between saturated light of wavelength 430-580 nm and 480-560 nm. The first supplemental light emitter(s) have dominant emission wavelength of 465-540 nm. The second supplemental light emitter(s) have dominant emission wavelength of 600-640 nm.

Claims

1. A lighting device comprising:

a first group of non-white light sources, each of said non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside an area bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus and (2) within an area on a 1976 CIE Chromaticity Diagram enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 430 nm to about 480 nm, a first line segment extending from a point representing saturated light having wavelength of about 480 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a second line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 430 nm;

a first group of supplemental light emitters, each of said first group of supplemental light emitters having a dominant emission wavelength in the range of from about 465 nm to about 540 nm; and

a second group of supplemental light emitters, each of said second group of supplemental light emitters having a dominant emission wavelength in the range of from about 600 nm to about 640 nm.

2. A lighting device as recited in claim 1, wherein said first group of non-white light sources comprises at least a first light source solid state light emitter and at least a first luminescent material.

3. A lighting device as recited in claim 1, wherein said first group of non-white light sources comprises at least a first light source having a FWHM value of at least 40 nm.

4. A lighting device as recited in claim 1, wherein when each of said first group of non-white light sources, each of said first group of supplemental light emitters and each of said second group of supplemental light emitters are emitting light, a mixture of (1) light emitted from said lighting device which was emitted by said first group of non-white light sources, (2) light emitted from said lighting device which was emitted by said first group of supplemental light emitters, and (3) light emitted from said lighting device which was emitted by said second group of supplemental light emitters would, in the absence of any additional light, have a combined illumination having x, y color coordinates which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

5. A lighting device as recited in claim 1, wherein said lighting device further comprises at least a first power line, and when energy is supplied to said first power line, said lighting device emits light which is within 0.01 u′

v′

of at least one point on the blackbody locus on a 1976 CIE Chromaticity Diagram.

6. A lighting device as recited in claim 1, wherein when each of said first group of non-white light sources, each of said first group of supplemental light emitters and each of said second group of supplemental light emitters are emitting light, a mixture of (1) light emitted from said lighting device which was emitted by said first group of non-white light sources, (2) light emitted from said lighting device which was emitted by said first group of supplemental light emitters, and (3) light emitted from said lighting device which was emitted by said second group of supplemental light emitters would, in the absence of any additional light, have a correlated color temperature in the range of from about 2,000 K to about 11,000 K.

7. A lighting device as recited in claim 1, wherein when each of said first group of non-white light sources, each of said first group of supplemental light emitters and each of said second group of supplemental light emitters are emitting light, a mixture of (1) light emitted from said lighting device which was emitted by said first group of non-white light sources, (2) light emitted from said lighting device which was emitted by said first group of supplemental light emitters, and (3) light emitted from said lighting device which was emitted by said second group of supplemental light emitters would, in the absence of any additional light, have a CRI of at least Ra 85.

8. A lighting device as recited in claim 1, wherein when each of said first group of non-white light sources, each of said first group of supplemental light emitters and each of said second group of supplemental light emitters are emitting light, light emitted from said lighting device which was emitted by said first group of non-white light sources comprises from about 40 percent to about 95 percent of the light emitted from said lighting device.

9. A lighting device as recited in claim 8, wherein said first group of non-white light sources comprises at least a first light source solid state light emitter which has a peak emission wavelength in the range of from about 390 nm to about 480 nm.

10. A lighting device as recited in claim 8, wherein said first group of non-white light sources comprises at least a first luminescent material which has a dominant emission wavelength in the range of from about 560 nm to about 580 nm.

11. A lighting device as recited in claim 1, wherein said first group of supplemental light emitters comprises at least a first supplemental group first light emitter which has a FWHM value of at least 40 nm.

12. A lighting device as recited in claim 1, wherein said first group of supplemental light emitters comprises at least a first supplemental group first light emitter which has a FWHM value in the range of from about 15 nm to about 30 nm.

13. A lighting device as recited in claim 1, wherein each of said second group of supplemental light emitters has a dominant emission wavelength in the range of from about 610 nm to about 635 nm.

14. A lighting device as recited in claim 1, wherein said second group of supplemental light emitters comprises at least a second supplemental group first light emitter which has a FWHM value of at least 40 nm.

15. A lighting device as recited in claim 1, wherein said second group of supplemental light emitters comprises at least a second supplemental group first light emitter which has a FWHN value in the range of from about 15 nm to about 30 nm.

16. A lighting device as recited in claim 1, wherein each of said first group of supplemental light emitters is a packaged light emitting diode and each of said second group of supplemental light emitters is a packaged light emitting diode.

17. A lighting device as recited in claim 1, wherein at least one of said first group of supplemental light emitters and at least one of said second group of supplemental light emitters are combined as a single light emitting diode.

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

said first non-white light source comprises at least a first light source solid state light emitter and at least a first luminescent material,

at least one of said first group of supplemental light emitters, at least one of said second group of supplemental light emitters, said first light source solid state light emitter and said first luminescent material are combined as a single light emitting diode.

19. A lighting device as recited in claim 18, wherein said first light source solid state light emitter is a light emitting diode.

20. A lighting device as recited in claim 1, wherein each of said non-white light sources, when illuminated, emits light having x, y color coordinates which define a point which is within an area on a 1931 CIE Chromaticity Diagram enclosed by first, second, third, fourth and fifth line segments, said first line segment connecting a first point to a second point, said second line segment connecting said second point to a third point, said third line segment connecting said third point to a fourth point, said fourth line segment connecting said fourth point to a fifth point, and said fifth line segment connecting said fifth point to said first point, said first point having x, y coordinates of 0.32, 0.40, said second point having x, y coordinates of 0.36, 0.48, said third point having x, y coordinates of 0.43, 0.45, said fourth point having x, y coordinates of 0.42, 0.42, and said fifth point having x, y coordinates of 0.36, 0.38.

21. A lighting device as recited in claim 1, wherein said first group of non-white light sources consists of a single light emitter.

22. A lighting device as recited in claim 1, wherein said lighting device further comprises at least a third group of supplemental light emitters, said third group of supplemental light emitters comprising at least one light source that emits light perceived as white, off-white, purple-ish, blueish-purple and/or blueish-green.

23. A lighting device as recited in claim 1, wherein each of said non-white light sources comprises at least one first light source solid state light emitter and at least one luminescent material.

24. A lighting device as recited in claim 1, wherein each of said first group of supplemental light emitters and each of said second group of supplemental light emitters is a solid state light emitter.

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

said lighting device further comprises a second group of non-white light sources, each of said second group of non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside the area bounded by the first white-light boundary curve and the second white-light boundary curve, and (2) within the area on a 1976 CIE Chromaticity Diagram enclosed by the first saturated light curve, the first line segment, the second saturated light curve, and the second line segment;

the first group of non-white light sources is electrically connected so as to be commonly energized;

the second group of non-white light sources is electrically connected so as to be commonly energized and separately energized from the first group of non-white light sources; and

the first group of supplemental light emitters comprises at least one first group supplemental light emitter which is electrically connected so as to be commonly energized with the first group of non-white light emitters or the second group of non-white light emitters.

26. The lighting device of claim 25, wherein the first group of non-white light emitters and the second group of non-white light emitters have respective color points such that at least a portion of a tie line between the respective color points on the CIE31 Chromaticity Diagram is contained within a region bounded by the points having x, y coordinates of about 0.3528,0.4414;

0.3640,0.4629;

0.3953,0.4487; and

0.3845, 0.4296.

27. The lighting device of claim 26, wherein the at least one first group supplemental light emitter has a dominant wavelength in the range of from about 475 nm to about 485 nm.

28. The lighting device of claim 26, wherein the lighting device has a Color Temperature of from about 2500 K to about 4000 K and a color point within about 4 MacAdam ellipses of the blackbody locus.

29. The lighting device of claim 25, wherein the first group of non-white light sources and the second group of non-white light sources have respective color points such that at least a portion of a tie line between the respective color points on the CIE31 Chromaticity Diagram is contained within a region bounded by the points having x, y coordinates of about 0.3318,0.4013;

0.3426,0.4219;

0.3747,0.4122; and

0.3643, 0.3937.

30. The lighting device of claim 29, wherein the at least one first supplemental light emitter has a dominant wavelength of from about 475 nm to about 485 nm.

31. The lighting device of claim 29, wherein the lighting device has a Color Temperature of about 4000K and a color point within about 4 MacAdam ellipses of the black body locus.

32. A lighting device, comprising:

a first string comprising a first group of non-white light sources and at least one supplemental light emitter, each of said first group of non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside an area bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus and (2) within an area on a 1976 CIE Chromaticity Diagram enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 430 nm to about 480 nm, a first line segment extending from a point representing saturated light having wavelength of about 480 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a second line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 430 nm;

a second string comprising a second group of non-white light sources, each of said second group of non-white light sources, when illuminated, emitting light having u′

, v′

color coordinates which define a point which is (1) outside an area bounded by a first white-light boundary curve which is 0.01 u′

v′

above the planckian blackbody locus and a second white-light boundary curve which is 0.01 u′

v′

below the planckian blackbody locus and (2) within an area on a 1976 CIE Chromaticity Diagram enclosed by a first saturated light curve extending along all points representing saturated light having wavelength in the range of from about 430 nm to about 480 nm, a first line segment extending from a point representing saturated light having wavelength of about 480 nm to a point representing saturated light having wavelength of about 560 nm, a second saturated light curve extending along all points representing saturated light having wavelength in the range of from about 560 nm to about 580 nm, and a second line segment extending from a point representing saturated light having wavelength of about 580 nm to a point representing saturated light having wavelength of about 430 nm; and

a third string comprising a second group of supplemental light emitters, each of said second group of supplemental light emitters having a dominant emission wavelength in the range of from about 600 nm to about 640 nm.

33. A lighting device as recited in claim 32, wherein said at least one supplemental light emitter, when illuminated, emits light having a wavelength in the range of from about 430 nm to about 480 nm.

34. A lighting device as recited in claim 32, wherein said first group of non-white light sources emits light which is more blueish than light emitted by said second group of non-white light sources, and said second group of non-white light sources emits light which is more yellowish than light emitted by said first group of non-white light sources.

35. A lighting device as recited in claim 32, wherein said first group of non-white light sources emits light which is within a first color bin having chromaticity region bounded by line segments extending between coordinates on a CIE31 Chromaticity diagram of 0.3577, 0.4508;

0.3892, 0.4380;

0.3845, 0.4296; and

0.3528, 0.4414, and said second group of non-white light sources emits light which is within a second color bin having chromaticity region bounded by line segments extending between coordinates on a CIE31 Chromaticity diagram of 0.3640, 0.4629;

0.3953, 0.4487;

0.3892, 0.438; and

0.3577, 0.4508.

36. A lighting device as recited in claim 32, wherein when each of said first group of non-white light sources, each of said at least one supplemental light emitter and each of said second group of non-white light sources is emitting light, a mixture of (1) light emitted from said lighting device which was emitted by said first group of non-white light sources, (2) light emitted from said lighting device which was emitted by said at least one supplemental light emitter, and (3) light emitted from said lighting device which was emitted by said second group of non-white light sources would, in the absence of any additional light, have a CRI of at least Ra 85.

37. A lighting device as recited in claim 32, wherein when each of said first group of non-white light sources, each of said at least one supplemental light emitter and each of said second group of non-white light sources is emitting light, a mixture of (1) light emitted from said lighting device which was emitted by said first group of non-white light sources, (2) light emitted from said lighting device which was emitted by said at least one supplemental light emitter, and (3) light emitted from said lighting device which was emitted by said second group of non-white light sources would, in the absence of any additional light, have a correlated color temperature in the range of from about 2,000 K to about 11,000 K.