LED-based lamps

• US 8,197,105 B2
• Filed: 08/09/2010
• Issued: 06/12/2012
• Est. Priority Date: 08/13/2009
• Status: Expired due to Fees

• Current Assignee: Intematix Corporation
• Original Assignee: Intematix Corporation
• Inventors: Yang, Haitao
• Primary Examiner(s): TSO, LAURA K
• Application Number:
  US12/852,760
• Publication Number:
  US 20110058353A1
• Time in Patent Office: 673 Days
• Field of Search: None
• US Class Current: 362/346
• CPC Class Codes: A47F 11/10 Arrangements of light sources
• CPC Class Codes: A47F 3/001 Devices for lighting, humidifying, heating, ventilation
• CPC Class Codes: F21S 4/28 rigid, e.g. LED bars
• CPC Class Codes: F21S 8/02 of recess-mounted type, e.g. downlighters specially adapted for vehicle exteriors F21S41/00-F21S45/00
• CPC Class Codes: F21S 8/033 the surface being a wall or like vertical structure, e.g. building facade
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21V 7/0016 on lighting devices that also provide for direct lighting, e.g. by means of independent light sources, by splitting of the light beam, by switching between both lighting modes
• CPC Class Codes: F21V 7/0025 Combination of two or more reflectors for a single light source array of reflectors for a cluster of light sources F21V7/0083
• CPC Class Codes: F21V 7/0033 with successive reflections from one reflector to the next or following
• CPC Class Codes: F21V 7/005 with an elongated shape to cooperate with linear light sources
• CPC Class Codes: F21V 7/09 with a combination of different curvatures
• CPC Class Codes: F21W 2131/305 for refrigerators
• CPC Class Codes: F21W 2131/405 for shop-windows or displays
• 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: F25D 27/00 Lighting arrangements in general F21

Abstract

An LED-lamp (lighting bar) comprises a plurality of solid state light emitters (LEDs) configured as an elongate (linear) array and a generally concave cylindrical light reflective surface disposed along the length of the array of LEDs. The concave light reflective surface is configured to direct light over an illumination plane located to a side of the lamp. The LEDs can be configured such that their emission axes are oriented to the illumination plane at an angle of between 0° and 90. The lamp can further comprise a second generally concave cylindrical light reflective surface in which the concave light reflective surfaces are configured to direct light over illumination planes located on respective sides of the lamp. There is also disclosed a panel lamp and sign incorporating the lamp(s) of the invention.

Claims

1. A lamp comprising:

a plurality of solid state light emitters configured as an elongate array; and

a first generally concave cylindrical light reflective surface disposed along a length of the array of light emitting devices and configured to direct light over an illumination plane located to a side of the lamp;

an elongate channel shaped body in which the light emitters are located within and spaced along the length of the body;

wherein the body comprises a base portion, a first wall portion, and a second wall portion, and the concave light reflective surface extends between the base portion and the first wall portion;

wherein the light emitters extend along the second wall portion; and

a substantially convex light reflective cylindrical surface located within the body and extending along the second wall portion and configured such that in operation the concave and convex light reflective surfaces direct light over the illumination plan.

2. The lamp according to claim 1, and further comprising a second generally concave cylindrical light reflective surface in which the concave light reflective surfaces are configured to direct light over an illumination plane located on respective sides of the lamp.

3. The lamp according to claim 1 or claim 2, wherein the solid state light emitters are configured such that their emission axis is at an angle to the illumination plane of between 0°

and 90°

.

4. The lamp according to claim 2, wherein the concave light reflective surfaces abut to form a ridge which is configured to extend toward and overlay the array of light emitters.

5. The lamp according to claim 2, wherein each concave light reflective surface comprises a convex portion and wherein the convex portions abut to form a generally “

v”

shaped groove which is configured to overlay the array of light emitters.

6. The lamp according to claim 1 or claim 2, wherein the concave light reflective surface is one of being multi-faceted, a continuously curved surface and a combination thereof.

7. The lamp according to claim 1 or claim 2, wherein the concave light reflective surfaces are configured such that a variation in luminous emission intensity over the illumination plane is less than 10%.

8. The lamp according to claim 1, wherein the concave light reflective surface comprises an integral surface of the body.

9. The lamp according to claim 8, wherein the concave light reflective surface comprises an inner surface of the base portion and the first wall portion of the body.

10. The lamp according to claim 1, wherein the light reflective surfaces have a reflectance selected from the group consisting of:

at least 90%, at least 95% and at least 98%.

11. A panel lamp comprising an enclosure and incorporating at least one lamp according to claim 1 or claim 2.

12. The panel lamp according to claim 11, wherein the at least one lamp is located in the enclosure and configured to emit light towards the enclosure opening.

23. A light emitting sign comprising a light transmissive display surface and at least one lamp according to claim 1 or claim 2 that is configured to illuminate the display surface.

13. A panel lamp comprising:

an enclosure including a base; and

at least one lamp including

a plurality of solid state light emitters configured as an elongate array,

a first generally concave cylindrical light reflective surface disposed along a length of the array of light emitting devices, and

a second generally concave cylindrical light reflective surface disposed along a length of the array of light emitting devices,

wherein the first and second concave light reflective surfaces are configured to direct light over an illumination plane located on respective sides of the lamp;

wherein the at least one lamp is located in the enclosure and configured to emit light towards the base of the enclosure.

14. The panel lamp according to claim 13, and further comprising a light reflective surface on the base of the enclosure.

15. The panel lamp according to claim 14, wherein the light reflective surface on the base of the enclosure further comprises a light scattering surface.

16. The panel lamp according to claim 15, wherein the enclosure is quadrilateral in form and a respective lamp is located adjacent opposite walls of the enclosure and wherein the light reflective scattering surface comprises a convex cylindrical surface that extends between the walls of the enclosure at which the lamps are located.

17. The panel lamp according to claim 15, wherein the enclosure is quadrilateral in form and lamps are located adjacent opposite walls of the enclosure and wherein the light reflective scattering surface comprises a substantially planar surface that extends between the walls of the enclosure at which the lamps are located.

18. A panel lamp comprising:

an enclosure; and

at least one lamp including a plurality of solid state light emitters configured as an elongate array and a first generally concave cylindrical light reflective surface disposed along a length of the array of light emitting devices and configured to direct light over an illumination plane located to a side of the lamp; and

at least one phosphor material operable to absorb at least a portion of light emitted by the light emitters and to emit light of a different wavelength range, wherein the at least one phosphor material is provided at the enclosure opening.

19. The panel lamp according to claim 18, and further comprising a light transmissive window overlying the enclosure opening and wherein the at least one phosphor material is incorporated in the light transmissive window.

20. The panel lamp according to claim 19, wherein the at least one phosphor material is distributed substantially uniformly throughout the volume of the light transmissive window.

21. The panel lamp according to claim 19, and further comprising a light transmissive window overlying the enclosure opening and wherein the at least one phosphor material comprises at least one layer on at least a part of the surface of the light transmissive window.

22. The panel lamp according to claim 20 or claim 21, wherein the light transmissive window is selected from the group consisting of being:

substantially planar and arcuate in form.

26. The panel lamp according to claim 18, wherein the at least one lamp further includes a second generally concave cylindrical light reflective surface in which the concave light reflective surfaces are configured to direct light over an illumination plane located on respective sides of the lamp.

24. A light emitting sign comprising a light transmissive display surface and at least one lamp that is configured to illuminate the displace surface;

wherein the at least one lamp includes a plurality of solid state light emitters configured as an elongate array and a first generally concave cylindrical light reflective surface disposed along a length of the array of light emitting devices and configured to direct light over an illumination plane located to a side of the lamp; and

at least one phosphor material operable to absorb at least a portion of light emitted by the light emitters and to emit light of a different wavelength range, wherein the at least one phosphor material is located on the display surface.

25. The sign according to claim 24, wherein the display surface is light transmissive and the at least one phosphor material is provided as one or more layers on the display surface.

27. The panel lamp according to claim 24, wherein the at least one lamp further includes a second generally concave cylindrical light reflective surface in which the concave light reflective surfaces are configured to direct light over an illumination plane located on respective sides of the lamp.