LIGHT EMITTING DIODE BASED LINEAR LAMPS

• US 20110149548A1
• Filed: 12/13/2010
• Published: 06/23/2011
• Est. Priority Date: 12/22/2009
• Status: Abandoned Application

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Li, Yi-Qun, Yang, Haitao
• Application Number:
  US12/966,890
• Publication Number:
  US 20110149548A1
• Time in Patent Office: Days
• US Class Current: 362/84
• 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 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21V 15/013 the housing being an extrusion
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 2013/222 with LEDs

Abstract

A linear lamp (lighting bar) comprises: a linear array of LEDs and an elongate lens disposed over the array of LEDs. The lens comprises a generally concave central portion (divergent) and generally convex edge portions (convergent) and is configured such that in operation a variation in illuminance is less than 10% over an angular range of at least 90°. In one arrangement the concave central portion comprises an inner generally concave surface that faces the LEDs and an outer substantially planar and/or generally concave surface overlying the LEDs. The convex edge portions can comprise an outer generally convex surface. The lamp is suited for use in a light box for light emitting signage, under-cabinet/under-shelf lighting, cove lighting, retail display lighting, advertisement display lighting, wall sconce lighting and outdoor or indoor area lighting

Claims

1. A lamp comprising:

a plurality of LEDs configured as a linear array and an elongate lens disposed over the array of LEDs, the lens comprising a generally concave central portion and generally convex edge portions wherein the lens is configured such that in operation a variation in illuminance is less than 10% over an angular range of at least 90°

.

2. The lamp according to claim 1, wherein the concave central lens portion comprises an inner generally concave surface that faces the LEDs and an outer substantially planar and/or generally concave surface overlying the LEDs.

3. The lamp according to claim 2, wherein the concave surfaces are selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

4. The lamp according to claim 2, wherein the planar surface is parallel to a plane on which the LEDs are positioned.

5. The lamp according to claim 4, wherein the planar surface includes the concave surface overlying the LEDs.

6. The lamp according to claim 1, wherein the convex edge portions comprise an outer generally convex surface.

7. The lamp according to claim 6, wherein the outer convex surface is selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

8. The lamp according to claim 2, wherein the concave surface facing the LEDs further comprises at least two substantially planar surfaces.

9. The lamp according to claim 8, wherein the planar surfaces are oriented at an angle in a range of about 20°

to 45°

to the plane on which of the LEDs are located.

10. The lamp according to claim 9, wherein the planar surfaces are oriented at an angle of about 30°

.

11. The lamp according to claim 1, and configured in operation to emit a luminous flux of at least 500 lumens.

12. The lamp according to claim 1, wherein the lamp is selected from the group consisting of being configured for:

under-cabinet lighting, under-shelf lighting, cove lighting, retail display lighting, advertisement display lighting, wall sconce lighting, outdoor area lighting and indoor area lighting.

13. A light box comprising:

a housing having an opening that comprises a light emitting plane of the light box and at least one lamp comprising;

a plurality of LEDs configured as a linear array and an elongate lens disposed over the array of LEDs, the lens comprising a generally concave central portion and generally convex edge portions wherein the lens is configured such that in operation a variation in illuminance is less than 10% over an angular range of at least 90°

.

14. A light emitting sign comprising the light box according to claim 13 and a light transmissive display surface positioned at the light emitting plane.

15. The sign according to claim 14, wherein the light box is operable to generate light that appears white in color.

16. The sign according to claim 15, wherein the LEDs are operable to emit light that appears white in color.

17. The sign according to claim 14, wherein the LEDs are configured to emit light having a dominant wavelength in a wavelength range 400 to 480 nm and wherein the display surface further comprises at least one phosphor material configured in operation to absorb at least a portion of light emitted by the LEDs and to emit light of a selected color and wherein light generated by the light box comprises the combined light emitted by the LEDs and at least one phosphor material and appears white in color.

18. The sign according to claim 14, wherein the LEDs are configured to emit blue light having a dominant wavelength in a wavelength range 400 to 480 nm and wherein the display surface further comprises at least one phosphor material configured to define signage information and operable to absorb at least a portion of light emitted by the LEDs and to emit light of a selected color.

19. The sign according to claim 18, wherein the at least one phosphor material is selected from the group consisting of:

being provided as at least one layer on a surface of the light transmissive display surface and being incorporated in the light transmissive display surface.

20. A lamp comprising:

a plurality of LEDs configured as a linear array and an elongate lens disposed over the array of LEDs, wherein the lens has a cross-section comprising an inner generally concave surface that faces the LEDs and an outer generally convex surface including a planar and/or concave surface overlying the LEDs.

21. The lamp according to claim 20, and configured such that in operation the angular variation of illuminance is less than 10% over a angular range of about 90°

.

22. The lamp according to claim 20, wherein the inner concave surface facing the LEDs is selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

23. The lamp according to claim 20, wherein the outer convex surface is selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

24. The lamp according to claim 20, wherein the concave surface overlying the LEDs is selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

25. The lamp according to claim 20, wherein the planar surface is parallel to a plane at which the LEDs are positioned.

26. The lamp according to claim 25, wherein the planar surface includes the concave surface overlying the LEDs.

27. The lamp according to claim 20, wherein the inner generally concave surface that faces the LEDs further comprises planar surface portions.

28. The lamp according to claim 27, wherein the planar surface portion are oriented at an angle in a range of about 20°

to 45°

to the plane on which of the LEDs are located.

29. The lamp according to claim 28, wherein the planar surface portions are oriented at an angle of approximately 30°

.

30. The lamp according to claim 20, wherein each of the concave surfaces and convex surface are selected from the group consisting of being:

a part of a circular cylindrical surface, a part of an elliptical cylindrical surface and a multifaceted surface.

31. The lamp according to claim 20, and configured in operation to emit a luminous flux of at least 500 lumens.

32. The lamp according to claim 20, wherein the lamp is selected from the group consisting of being configured for:

under-cabinet lighting, under-shelf lighting, cove lighting, retail display lighting, advertisement display lighting, wall sconce lighting, outdoor area lighting and indoor area lighting.

33. A light box comprising:

a housing having an opening that comprises a light emitting plane of the light box and at least one LED lamp comprising;

a plurality of LEDs configured as a linear array and an elongate lens disposed over the array of LEDs, wherein the lens has a cross-section comprising an inner generally concave surface that faces the LEDs and an outer generally convex surface including a planar and/or concave surface overlying the LEDs.

34. A light emitting sign comprising the light box according to claim 33 and a light transmissive display surface positioned at the light emitting plane.

35. The sign according to claim 34, wherein the light box is operable to generate light that appears white in color.

36. The sign according to claim 35, wherein the LEDs are operable to emit light that appears white in color.

37. The sign according to claim 34, wherein the LEDs are configured to emit light having a dominant wavelength in a wavelength range 400 to 480 nm and wherein the display surface further comprises at least one phosphor material configured in operation to absorb at least a portion of light emitted by the LEDs and to emit light of a selected color and wherein light generated by the light box comprises the combined light emitted by the LEDs and at least one phosphor material and appears white in color.

38. The sign according to claim 37, wherein the at least one phosphor material is selected from the group consisting of:

being provided as at least one layer on a surface of the light transmissive display surface and being incorporated in the light transmissive display surface.