Device and apparatus for efficient collection and re-direction of emitted radiation

• US 8,727,573 B2
• Filed: 03/04/2013
• Issued: 05/20/2014
• Est. Priority Date: 09/01/2010
• Status: Active Grant

• Current Assignee: Signify Holding B.V. (Signify N.V.)
• Original Assignee: Cooper Technologies Company (Eaton Corporation PLC.)
• Inventors: Holder, Ronald Garrison
• Primary Examiner(s): BRUCE, DAVID VERNON
• Application Number:
  US13/784,355
• Publication Number:
  US 20130182443A1
• Time in Patent Office: 442 Days
• Field of Search: 362/241, 362/245, 362/247, 362/249.02, 362/299, 362/302
• US Class Current: 362/297
• CPC Class Codes: F21K 9/60 Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
• CPC Class Codes: F21V 13/04 the elements being reflectors and refractors for vehicle rear lights F21S43/40
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/04 Optical design
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00

Abstract

An apparatus is described, including a light source, a lens and two reflectors. A first reflector is positioned to reflect a first portion of light from the light source, wherein the first portion of light is radiated from the light source in a central forward solid angle as defined by an outer edge of the first reflector. The lens is azimuthally horizontal to the light source for accepting a second portion of light from the light source emitted in a peripheral forward solid angle. A second reflector reflects the first portion of light after reflectance from the first reflector and the second portion of light after passing through the lens in a composite beam, wherein the first reflector and the lens are configured such that the first and second portions of light behave as though they were emitted from a point source at the second reflector focus.

Claims

1. A lighting system comprising:

a first reflective surface that extends about an axis;

a second reflective surface that extends about the axis;

a ring-shaped aperture formed between the first reflective surface and the second reflective surface;

at least one light emitting diode disposed along the axis, facing the second reflective surface; and

a refractive surface extending about the axis adjacent the at least one light emitting diode,

wherein the first reflective surface and the second reflective surface are arranged so that the second reflective surface directs first incident light to the first reflective surface, and the first reflective surface directs the first incident light to exit the lighting system through the ring-shaped aperture, and

wherein the refractive surface directs second incident light to the first reflective surface, and the first reflective surface directs the second incident light to exit the lighting system through the ring-shaped aperture.

2. The lighting system of claim 1, wherein the first reflective surface comprises a surface of revolution with respect to the axis.

3. The lighting system of claim 1, wherein the second reflective surface comprises a surface of revolution with respect to the axis.

4. The lighting system of claim 1, wherein the refractive surface comprises a surface of revolution with respect to the axis.

5. The lighting system of claim 1, wherein the refractive surface is toroidal.

6. The lighting system of claim 1, wherein the refractive surface comprises a lens having a donut-like shape.

7. The lighting system of claim 1, wherein a lens comprises the refractive surface, and

wherein the lens comprises an opening through which the axis passes.

8. The lighting system of claim 1, wherein substantially all light emitted by the at least one light emitting diode that is incident on the first reflective surface has been incident on at least one of the refractive surface and the second reflective surface prior to incidence on the first reflective surface.

9. The lighting system of claim 1, wherein a portion of light emitted by the at least one light emitting diode that is incident on the first reflective surface has been incident on exactly one of the refractive surface and the second reflective surface prior to incidence on the first reflective surface, and

wherein another portion of light emitted by the at least one light emitting diode that is incident on the first reflective surface has been incident on the refractive surface and the second reflective surface prior to incidence on the first reflective surface.

10. The lighting system of claim 1, wherein substantially all light emitted through the ring-shaped aperture has been directed by at least two of the first reflective surface, the second reflective surface, and the refractive surface.

11. The lighting system of claim 1, wherein in cross section, on one side of the axis, the first reflective surface is concave and the second reflective surface is concave.

12. The lighting system of claim 1, wherein the second reflective surface comprises a point at the axis, the point facing the at least one light emitting diode.

13. A lighting system comprising:

an optical axis along which light flows;

a first reflector through which the optical axis passes;

a second reflector disposed circumferentially about the optical axis;

a ring-shaped aperture, formed between the first reflector and the second reflector, through which light exits the lighting system;

a light emitting diode disposed on the optical axis; and

a lens extending peripherally about the light emitting diode and having an opening through which the optical axis passes,

wherein the first reflector tapers towards the light emitting diode and comprises a reflective surface region that is concave in cross section.

14. The lighting system of claim 13, wherein the second reflector comprises a profile that is substantially parabolic.

15. The lighting system of claim 13, wherein the lens is torodial.

16. The lighting system of claim 13, wherein the first reflector, the second reflector, and the lens are configured so that substantially all light emitted from the ring-shaped aperture has been reflected by the second reflector and has been refracted by the lens or reflected by the first reflector.

17. A lighting system comprising:

a light emitting diode;

a first reflective surface of revolution that tapers down towards the light emitting diode and that provides an aperture;

a second reflective surface of revolution that tapers down towards the light emitting diode and that is disposed in the aperture; and

a refractive lens disposed in an opening between the first reflective surface of revolution and the second reflective surface of revolution.

18. The lighting system of claim 17, wherein the first reflective surface of revolution is concave, and

wherein the second reflective surface of revolution is concave.

19. The lighting system of claim 18, wherein the second reflective surface of revolution tapers to a point that is pointed at the light emitting diode.

20. The lighting system of claim 18, wherein the refractive lens comprises a donut-shaped lens.