LED-array light source with aspect ratio greater than 1
An LED light source for use in LED lighting fixtures, the LED light source comprising a submount including an LED-populated area which has an aspect ratio greater than 1, an array of LEDs on the LED-populated area, and a lens on the submount over the LED-populated area. Various embodiments facilitating preferential-side lighting, such as for roadway uses, are also disclosed.
1. An LED light source configured to direct LED-emitted light toward a preferential side, the light source comprising:
a submount including an LED-populated area which has an aspect ratio greater than 1 and major and minor orthogonal cross-dimensions, the preferential side being along the major cross-dimension;
an array of LEDs on the LED-populated area, the minor cross-dimension being defined by more than one LED; and
a lens on the submount over the LED-populated area.
2. The LED light source of claim 1 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about one-third of the LED-populated area.
3. The LED light source of claim 1 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about two-thirds of the LED-populated area.
4. The LED light source of claim 3 wherein the spacing and arrangement of the LEDs are such that the total LED area is about 90% of the LED-populated area.
5. The LED light source of claim 3 wherein the spacing between LEDs is no more than about 1 millimeter.
6. The LED light source of claim 5 wherein the spacing between LEDs is no more than about 0.5 millimeters.
7. The LED light source of claim 6 wherein the spacing between LEDs is no more than about 0.1 millimeters.
8. The LED light source of claim 7 wherein the spacing between LEDs is no more than about 0.075 millimeters.
9. The LED light source of claim 8 wherein the spacing between the LEDs is no more than about 0.05 millimeters.
10. The LED light source of claim 1 wherein the aspect ratio is at least about 1.25.
11. The LED light source of claim 10 wherein the aspect ratio is at least about 1.5.
12. The LED light source of claim 11 wherein the aspect ratio is at least about 2.
13. The LED light source of claim 1 wherein the LED-populated area is rectangular.
14. The LED light source of claim 13 wherein the array includes at least eight LEDs positioned in two rows of four LEDs in each row.
15. The LED light source of claim 13 wherein the array includes forty-eight LEDs positioned in four rows of twelve LEDs in each row.
16. The LED light source of claim 1 wherein the lens is shaped for refraction of LED-emitted light toward the preferential side.
17. The LED light source of claim 16 wherein the lens is asymmetric.
18. The LED light source of claim 1 wherein the lens is overmolded on the submount.
19. The LED light source of claim 1 wherein the submount comprises ceramic material.
20. The LED light source of claim 19 wherein the ceramic material is aluminum nitride.
21. The LED light source of claim 1 wherein the submount has front and back sides, the LED-populated area being on the front side, and the light source further comprises electrodes on the back side.
22. The LED light source of claim 1 wherein the LED-populated area is asymmetric.
23. An LED light source configured to direct LED-emitted light toward a preferential side, the LED light source comprising:
a submount including an LED-populated area which has an aspect ratio greater than 1;
an array of LEDs on the LED-populated area, the LED array defining an emitter axis; and
a lens on the submount over the LED-populated area, the lens having an outer surface and a centerline which is offset from the emitter axis toward the preferential side.
24. An LED light source configured to direct LED-emitted light toward a preferential side, the LED light source comprising:
a submount including an LED-populated area which has an aspect ratio greater than 1;
an array of LEDs on the LED-populated area, the LED-populated area having major and minor orthogonal cross-dimensions and the preferential side being along the major cross-dimension, the minor cross-dimension being defined by more than one LED, thereby providing an illumination pattern which is offset toward the preferential side with respect to the emitter axis; and
a lens on the submount over the LED-populated area.
25. An LED light source configured to direct LED-emitted light toward a preferential side, the LED light source comprising:
a submount including an LED-populated area with an array of light-emitting diodes (LEDs) thereon, the LED-populated area having first and second maximum cross-dimensions orthogonal to one another where the first cross-dimension is greater than the second cross-dimension, the second cross-dimension being defined by more than one LED, the preferential side being along the first cross-dimension; and
a lens on the submount over the LED-populated area.
26. The LED light source of claim 25 wherein the ratio of the first cross-dimension to the second cross-dimension of the LED-populated area is at least about 1.25.
27. The LED light source of claim 26 wherein the ratio is at least about 1.5.
28. The LED light source of claim 27 wherein the ratio is at least about 2.
29. The LED light source of claim 25 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about one-third of the LED-populated area.
30. The LED light source of claim 29 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about two-thirds of the LED-populated area.
31. The LED light source of claim 30 wherein the spacing and arrangement of the LEDs are such that the total LED area is about 90% of the LED-populated area.
32. The LED light source of claim 25 wherein the spacing between LEDs is no more than about 1 millimeter.
33. The LED light source of claim 32 wherein the spacing between LEDs is no more than about 0.5 millimeters.
34. The LED light source of claim 33 wherein the spacing between LEDs is no more than about 0.1 millimeters.
35. The LED light source of claim 34 wherein the spacing between LEDs is no more than about 0.075 millimeters.
36. The LED light source of claim 35 wherein the spacing between the LEDs is no more than about 0.05 millimeters.
37. The LED light source of claim 25 wherein the LED-populated area is rectangular.
38. The LED light source of claim 37 wherein the array includes at least eight LEDs positioned in two rows of four LEDs in each row.
39. The LED light source of claim 37 wherein the array includes forty-eight LEDs arranged in four rows of twelve LEDs in each row.
40. The LED light source of claim 25 being configured to refract LED-emitted light toward a preferential side.
41. The LED light source of claim 40 wherein the lens is shaped to direct LED-emitted light toward the preferential side.
42. The LED light source of claim 25 wherein the lens is overmolded on the submount.
43. The LED light source of claim 25 wherein the submount comprises ceramic material.
44. The LED light source of claim 43 wherein the ceramic material is aluminum nitride.
45. The LED light source of claim 25 wherein the submount has front and back sides, the LED-populated area being on the front side, and the light source further comprises electrodes on the back side.
46. The LED light source of claim 25 wherein the LED-populated area is asymmetric.
47. An LED light source configured to direct LED-emitted light toward a preferential side, the LED light source comprising:
a submount including an LED-populated area with an array of light-emitting diodes (LEDs) thereon, the LED array defining an emitter axis, the LED-populated area having first and second maximum cross-dimensions orthogonal to one another, the first cross-dimension being greater than the second cross-dimension; and
a lens on the submount over the LED-populated area, the lens having an outer surface and a centerline which is offset toward the preferential side from the emitter axis.
48. The LED light source of claim 47 wherein the lens is shaped to direct LED-emitted light toward the preferential side.
49. An LED light source configured to direct LED-emitted light toward a preferential side, the LED light source comprising;
a submount including an LED-populated area which has an aspect ratio greater than 1 and major and minor orthogonal cross-dimensions, the preferential side being along the major cross-dimension;
an array of LEDs on the LED-populated area, the minor cross-dimension being defined by more than one LED; and
an asymmetric lens on the submount over the LED-populated area.
50. The LED light source of claim 49 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about one-third of the LED-populated area.
51. The LED light source of claim 49 wherein the spacing and arrangement of the LEDs are such that the total LED area is at least about two-thirds of the LED-populated area.
52. The LED light source of claim 51 wherein the spacing and arrangement of the LEDs are such that the total LED area is about 90% of the LED-populated area.
53. The LED light source of claim 51 wherein the spacing between LEDs is no more than about 1 millimeter.
54. The LED light source of claim 53 wherein the spacing between LEDs is no more than about 0.5 millimeters.
55. The LED light source of claim 54 wherein the spacing between LEDs is no more than about 0.1 millimeters.
56. The LED light source of claim 55 wherein the spacing between LEDs is no more than about 0.075 millimeters.
57. The LED light source of claim 56 wherein the spacing between the LEDs is no more than about 0.05 millimeters.
58. The LED light source of claim 49 wherein the aspect ratio is at least about 1.25.
59. The LED light source of claim 58 wherein the aspect ratio is at least about 1.5.
60. The LED light source of claim 59 wherein the aspect ratio is at least about 2.
61. The LED light source of claim 49 wherein the LED-populated area is rectangular.
62. The LED light source of claim 61 wherein the array includes at least eight LEDs positioned in two rows of four LEDs in each row.
63. The LED light source of claim 61 wherein the array includes forty-eight LEDs positioned in four rows of twelve LEDs in each row.
64. The LED light source of claim 49 wherein the lens is overmolded on the submount.
65. The LED light source of claim 49 wherein the submount comprises ceramic material.
66. The LED light source of claim 65 wherein the ceramic material is aluminum nitride.
67. The LED light source of claim 49 wherein the submount has front and back sides, the LED-populated area being on the front side, and the light source further comprises electrodes on the back side.
68. The LED light source of claim 49 wherein the LED-populated area is asymmetric.
69. The LED light source of claim 68 wherein the lens is overmolded on the submount.
70. The LED light source of claim 68 wherein:
the LED array defines an emitter axis; and
the lens has an outer surface and a centerline which is offset from the emitter axis toward a preferential direction.
71. The LED light source of claim 68 wherein the submount comprises ceramic material.
72. The LED light source of claim 71 wherein the ceramic material is aluminum nitride.
73. The LED light source of claim 71 wherein the submount has front and back sides, the LED-populated area being on the front side, and the light source further comprises electrodes on the back side.
74. An LED light source comprising:
a submount including an LED-populated area which has an aspect ratio greater than 1;
an array of LEDs on the LED-populated area, the LED array defining an emitter axis; and
an asymmetric lens on the submount over the LED-populated area, the lens having an outer surface and a centerline which is offset from the emitter axis toward a preferential direction.
75. An LED light source comprising:
a submount including an LED-populated area which has an aspect ratio greater than 1;
an array of LEDs on the LED-populated area, the LED array defining an emitter axis, the LED-populated area having major and minor orthogonal cross-dimensions and a preferential direction being along the minor cross-dimension, the minor cross-dimension being defined by more than one LED, thereby providing an illumination pattern which is offset toward a preferential direction with respect to the emitter axis; and
an asymmetric lens on the submount over the LED-populated area.