Luminaire having an aperature light path

• US 7,654,686 B2
• Filed: 11/15/2007
• Issued: 02/02/2010
• Est. Priority Date: 11/15/2007
• Status: Active Grant

• Current Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Oza, Napoli
• Primary Examiner(s): Ward; John A
• Application Number:
  US11/940,556
• Publication Number:
  US 20090129072A1
• Time in Patent Office: 810 Days
• Field of Search: 362/559, 362/576, 362/365, 362/366, 362/367, 362/249.01, 362/249.02, 362/231, 362/373
• US Class Current: 362/231
• CPC Class Codes: F21S 8/036 by means of a rigid support, e.g. bracket or arm
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21W 2131/304 for pictures
• 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: G02B 6/0096 the lights guides being of the hollow type

Abstract

A luminaire comprising an output aperture having an input port and an output port, a radiation guide having an input port and an output port and an array of LEDs located at the input port of the guide. Light emitted by the LEDs is transmitted into the guide. The input port of the aperture operatively connects to the output port of guide and is positioned adjacent thereto so that a central plane of the output aperture is asymmetric relative to a central plane of the radiation guide.

Claims

1. A luminaire comprising:

an output aperture having an input port and an output port defining an aperture light path, the output aperture having a top and a bottom which are not parallel to each other;

a radiation guide having an input port and an output port and having an optical guide plane extending from the input port to the output port; and

an array of LEDs located at the input port of the radiation guide such that light emitted by the LEDs is transmitted into the radiation guide;

wherein the input port of the aperture operatively connects to the output port of the radiation guide and is positioned adjacent thereto such that a cross section of the output aperture is asymmetrical relative to the optical guide plane, and wherein the output aperture has parallel sides and a rectangular cross section perpendicular to the aperture light path and perpendicular to the optical guide plane extending through the aperture.

2. The luminaire of claim 1 wherein the optical guide plane is curved from the input port of the guide to the output port of the guide.

3. The luminaire of claim 1 wherein the LEDs emit colored light of various, different wavelength ranges, and wherein the radiation guide color mixes the colored light as it travels from the input port of the radiation guide to the output port of the radiation guide along the optical guide plane to eliminate or to minimize contrast of the color shadows created by multiple LEDs.

4. The luminaire of claim 1 further comprising a driver circuit for driving the array of LEDs with pulse width modulated signals of varying duty cycle to emit different light outputs from the output port of the output aperture.

5. The luminaire of claim 4 further comprising a color sensor positioned within or adjacent the luminaire, the color sensor providing a color signal to the driver circuit indicative of wavelength and/or intensity of light, the driver circuit responsive to the color signal to modify the pulse width modulated signals as a function thereof.

6. The luminaire of claim 1 further comprising a diffuser positioned such that at least some of the light output from the output port of the output aperture is transmitted by the diffuser.

7. The luminaire of claim 1 wherein the array of LEDs is a planar, linear array, and wherein the guide has parallel sides and has a top and a bottom parallel to each other, the guide having a rectangular cross section perpendicular to the optical guide plane.

8. The luminaire of claim 1 further comprising:

a control lens, wherein the control lens is positioned along the aperture light path or within the radiation guide.

9. The luminaire of claim 8, wherein the control lens is a collimating lens.

10. A luminaire comprising:

an output aperture having an input port and an output port defining an aperture light path, the output aperture having a top and a bottom which form an angle relative to each other;

a radiation guide having an input port and an output port and having an optical guide plane extending from the input port to the output port; and

an array of LEDs located at the input port of the radiation guide such that light emitted by the LEDs is transmitted into the radiation guide;

wherein the input port of the aperture operatively connects to the output port of the radiation guide and is positioned adjacent thereto and wherein the output port of the output aperture is offset from the input port of the output aperture relative to the optical guide plane, and wherein the output aperture has parallel sides and a rectangular cross section perpendicular to the aperture light path and perpendicular to the optical guide plane extending through the aperture.

11. The luminaire of claim 10 wherein the offset defines an acute angle.

12. The luminaire of claim 10 wherein the guide has a non-planar top parallel to a non-planar bottom such that the optical guide plane is curved from the input port of the guide to the output port of the guide.

13. The luminaire of claim 10 wherein the LEDs emit colored light of various, different wavelength ranges, and wherein the radiation guide color mixes the colored light as it travels from the input port of the radiation guide to the output port of the radiation guide along the optical guide plane to eliminate or to drastically reduce contrast of the color shadows created by multiple LEDs.

14. The luminaire of claim 10 further comprising a driver circuit for driving the LEDs with pulse width modulated signals of varying duty cycle to emit different light outputs from the output port of the output aperture.

15. The luminaire of claim 14 further comprising a color sensor positioned within or adjacent the luminaire, the color sensor providing a color signal to the driver circuit indicative of wavelength and/or intensity of light, the driver circuit responsive to the color signal to modify the pulse width modulated signals as a function thereof.

16. The luminaire of claim 10 further comprising a diffuser positioned such that at least some of the light output from the output port of the output aperture is transmitted by the diffuser.

17. The luminaire of claim 10 wherein the array of LEDs is a planar, linear array, and wherein the radiation guide has parallel sides and has a top and a bottom parallel to each other, the radiation guide having a rectangular cross section perpendicular to the optical guide plane.

18. The luminaire of claim 10, further comprising:

a control lens, wherein the control lens is positioned along the aperture light path or within the radiation guide.

19. The luminaire of claim 18, wherein the control lens is a collimating lens.

20. A luminaire comprising:

an output aperture having an input port and an output port;

a radiation guide having an input port and an output port; and

an array of LEDs located at the input port of the radiation guide such that light emitted by the LEDs is transmitted into the radiation guide;

wherein the input port of the aperture operatively connects to the output port of the radiation guide and is positioned adjacent thereto such that a central plane of the output aperture is asymmetric relative to a central plane of the radiation guide, and wherein the output aperture has parallel sides and a rectangular cross section perpendicular to the aperture light path and perpendicular to the optical guide plane extending through the aperture.

21. The luminaire of claim 20 wherein the output port of the aperture is larger than the input port of the aperture to form an asymmetrical beam of light.

22. The luminaire of claim 20 wherein the LEDs emit colored light of various, different wavelength ranges, and wherein the radiation guide color mixes the colored light as it travels from the input port of the radiation guide to the output port of the radiation guide along the optical guide plane to eliminate or to drastically reduce contrast of the color shadows created by multiple LEDs.

23. The luminaire of claim 20 further comprising a driver circuit for driving the LEDs with pulse width modulated signals of varying duty cycle to emit different light outputs from the output port of the output aperture.

24. The luminaire of claim 23 further comprising a color sensor positioned within or adjacent the luminaire, the color sensor providing a color signal to the driver circuit indicative of wavelength and/or intensity of light, the driver circuit responsive to the color signal to modify the pulse width modulated signals as a function thereof.

25. The luminaire of claim 20 further comprising a diffuser positioned such that at least some of the light output from the output port of the output aperture is transmitted by the diffuser.

26. The luminaire of claim 20 wherein the array of LEDs is a planar, linear array, and wherein the radiation guide has parallel sides and has a top and a bottom parallel to each other, the radiation guide having a rectangular cross section perpendicular to the optical guide plane.

27. The luminaire of claim 20, further comprising:

a control lens, wherein the control lens is positioned along the aperture light path or within the radiation guide.

28. The luminaire of claim 27, wherein the control lens is a collimating lens.