Constrained folded path resonant white light scintillator

• US 8,646,949 B2
• Filed: 03/03/2010
• Issued: 02/11/2014
• Est. Priority Date: 03/03/2010
• Status: Active Grant

• Current Assignee: Ventura Mfg1, LLC
• Original Assignee: Lumenflow Corp.
• Inventors: Brunt, Harold W. Jr., Bourget, Paul L.
• Primary Examiner(s): Patel, Nimeshkumar
• Assistant Examiner(s): RAABE, CHRISTOPHER M
• Application Number:
  US12/716,337
• Publication Number:
  US 20110215707A1
• Time in Patent Office: 1,441 Days
• Field of Search: 313/114, 362/300, 362/302, 362/303, 257/98
• US Class Current: 362/303
• 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 13/08 the elements being filters or photoluminescent elements and reflectors
• CPC Class Codes: F21V 7/0033 with successive reflections from one reflector to the next or following
• CPC Class Codes: H01L 33/50 Wavelength conversion elements
• CPC Class Codes: H01L 33/58 Optical field-shaping elements

Abstract

An optical emitter enabling conversion of light from a light source. The optical emitter includes a first conic reflector defining an aperture for receiving the light source, a second conic reflector opposite the first conic reflector for collimating light emitted by the light source, and a volumetric light conversion element between at least a portion of the first reflector and at least a portion of the second reflector. The optical emitter can also include a convex mirror adjacent the vertex of the second conic reflector, and an elliptical element adjacent the first conic reflector. The light conversion element can include phosphor dispersed in a resin to convert light from a first wavelength to light of a second, longer, wavelength, wherein converted light is emitted from the light conversion element.

Claims

1. An optical emitter comprising:

a first conic reflector including a first reflector vertex and adapted to receive a light source proximate the first reflector vertex;

a second conic reflector coaxial with the first reflector, the first and second conic reflectors facing one another and being substantially reflective to light from the light source to define a folded path cavity therebetween; and

a volumetric light conversion element between at least a portion of the first conic reflector and at least a portion of the second conic reflector within the folded path cavity, wherein the volumetric light conversion element is adapted to down-convert light reflected between the first and second conic reflectors and emit the down-converted light generally radially outward from between the first and second conic reflectors and not through the first and second conic reflectors.

2. The optical emitter of claim 1 wherein the first conic reflector defines an aperture at the first reflector vertex.

3. The optical emitter of claim 1 wherein the volumetric light conversion element interconnects the first and second conic reflectors.

4. The optical emitter of claim 1 wherein the light conversion element includes a plurality of wavelength-converting phosphors.

5. The optical emitter of claim 1 wherein the light conversion element includes an annular outer surface to form at least one of a cylindrical exterior and a frusto-conical exterior.

6. The optical emitter of claim 1 wherein the first conic reflector is elliptical.

7. The optical emitter of claim 1 wherein the second conic reflector is parabolic.

8. The optical emitter of claim 1 wherein the first conic reflector vertex is located at the focus of the second conic reflector.

9. The optical emitter of claim 1 further comprising a convex mirror adjacent the second conic reflector and coaxial with the first conic reflector.

10. The optical emitter of claim 1 further comprising an elliptical element coaxial with the first conic reflector, wherein the first reflector vertex is aligned with one of the elliptical element focus and the elliptical element vertex.

21. The optical emitter of claim 1 wherein the optical emitter comprises a light engine that projects light similar to a light filament or arc.

22. The optical emitter of claim 1 wherein the optical emitter creates a gain function in the intensity of light introduced into the optical emitter.

23. The light emitter of claim 1 wherein:

the light conversion element includes an annular outer surface; and

the converted light is emitted through the annular outer surface in a generally toroidal or spherical pattern.

11. A light emitter comprising:

a first reflector defining an aperture for a light source;

a second reflector opposite the first reflector, at least one of the first and second reflectors being a conic, the first and second reflectors being substantially reflective to light from the light source to define a folded path cavity therebetween; and

a volumetric light conversion medium within the folded path cavity, the volumetric light conversion medium including phosphor dispersed in a resin to convert light emitted by the light source from a first wavelength to a second wavelength, the second wavelength being longer than the first wavelength, wherein the volumetric light conversion medium radiates light at the second wavelength generally radially outward from between the first and second reflectors and not through the first and second reflectors.

12. The light emitter of claim 11 wherein the light conversion medium is substantially solid.

13. The light emitter of claim 11 wherein:

the light conversion medium includes an annular outer surface; and

the converted light is emitted through the annular outer surface in a generally toroidal pattern.

14. The light emitter of claim 11 wherein the first reflector is a discontinuous conic reflector.

15. The light emitter of claim 11 wherein the light conversion medium is injection molded.

16. An optical emitter comprising:

a first conic reflector;

a second conic reflector opposite the first conic reflector, the second reflector being substantially reflective;

a third conic reflector opposite the second conic reflector and adjacent the first conic reflector;

a negative mirror adjacent the vertex of the second conic reflector; and

a translucent light conversion element between the first and second conic reflectors, wherein the translucent light conversion element emits light generally radially outward from between the first and second reflectors and not through the first and second reflectors.

17. The optical emitter of claim 16 wherein the first and third conic reflectors define a coextensive aperture for a light source.

18. The optical emitter of claim 16 wherein the first, second and third conic reflectors are coaxial.

19. The optical emitter of claim 16 wherein the light conversion element extends between at least a portion of the first conic reflector and at least a portion of the second conic reflector.

20. The optical emitter of claim 16 wherein the light conversion element includes phosphor dispersed in a resin to convert light emitted by the light source from a first wavelength to a second wavelength, the second wavelength being longer than the first wavelength.