Method and device for concentrating, collimating, and directing light

• US 8,847,142 B2
• Filed: 07/20/2011
• Issued: 09/30/2014
• Est. Priority Date: 07/20/2011
• Status: Active Grant

• Current Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Original Assignee: Hong Kong Applied Science And Technology Research Institute Co., Ltd.
• Inventors: Zhou, Wei, Huang, Xuyan, Lu, Ming
• Primary Examiner(s): Luu, Thanh
• Assistant Examiner(s): Chavez, Renee
• Application Number:
  US13/187,327
• Publication Number:
  US 20110315862A1
• Time in Patent Office: 1,168 Days
• Field of Search: 250/227.11, 126/648, 126/649, 126/684, 126/685, 126/688, 126698-700, 136/246, 136/259, 385/146, 385 33- 38
• US Class Current: 250/227.11
• CPC Class Codes: F24S 23/12 Light guides
• CPC Class Codes: F24S 23/71 with parabolic reflective surfaces with cylindro-parabolic reflective surfaces F24S23/74
• CPC Class Codes: G02B 17/002 Arrays of reflective systems
• CPC Class Codes: G02B 19/0023 at least one surface having optical power
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0042 for use with direct solar radiation
• CPC Class Codes: G02B 19/0076 for use with a detector G02B19/009, G02B19/0095 take precedence
• CPC Class Codes: G02B 6/262 Optical details of coupling light into, or out of, or between fibre ends, e.g. special fibre end shapes or associated optical elements
• CPC Class Codes: G02B 6/2852 using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)
• CPC Class Codes: H01L 31/0525 including means to utilise heat energy directly associated with the PV cell, e.g. integrated Seebeck elements
• CPC Class Codes: H01L 31/0547 comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
• CPC Class Codes: Y02E 10/40 Solar thermal energy, e.g. solar towers
• CPC Class Codes: Y02E 10/52 PV systems with concentrators

Abstract

An optical system for light energy concentration may comprise a light concentrator to convert incident light to converging light, a light collimating element to receive the converging light and to reduce an angle of convergence of the converging light, and a light directing element to direct the reduced-angle converging light to a light guide to transmit the directed light.

Claims

1. An apparatus comprising:

a light concentrator to convert incident light to converging light;

a light collimating element to receive said converging light and to reduce an angle of convergence of said converging light; and

a light directing element to re-direct and transfer said reduced-angle converging light along a portion of a light guide to transmit said directed light;

wherein said light directing element comprises a curved reflective interior surface for total internally reflecting said light at a particular angle based, at least in part, on a curvature of said curved reflective interior surface, such that said total internally reflected light enters said light guide at a nonparallel angle that allows total internal reflection to occur in said light guide, and further wherein an optical axis of said light guide is perpendicular to an optical axis of said light concentrator.

2. The apparatus of claim 1, wherein said light collimating element includes at least one curved surface to perform said reducing the angle of convergence of said converging light.

3. The apparatus of claim 1, wherein said light collimating element includes a multi-sided prism to perform said reducing the angle of convergence of said converging light.

4. The apparatus of claim 1, wherein said light collimating element is located external to said light guide.

5. The apparatus of claim 1, wherein said light directing element is located external to said light guide.

6. The apparatus of claim 1, wherein said light guide comprises a rod-type light guide.

7. The apparatus of claim 6, wherein said light guide includes at least two opposing plane surfaces, wherein said transmitted light travels from an entry-end surface toward an exit-end surface.

8. The apparatus of claim 1, further comprising an energy conversion element to receive said reduced-angle converging light via said light guide.

9. The apparatus of claim 8, wherein said energy conversion element comprises at least one device to convert said received light to other forms of energy.

10. The apparatus of claim 1, wherein said light concentrator comprises a curved mirror.

11. The apparatus of claim 10, wherein said light concentrator further comprises a secondary curved mirror.

12. The apparatus of claim 1, wherein said light concentrator comprises a refractive lens.

13. The apparatus of claim 1, wherein said light collimating element and said light directing element are located to receive said converging light at a focus point of said light concentrator.

14. A method comprising:

collecting and focusing incident light from a light concentrator onto a light collimating element to increase an f-number of said incident light, wherein said f-number of said incident light represents a quantitative measure of a steepness of a cone of said incident light;

steering and transferring said f-number-increased light received from said light collimating element via a curved reflective interior surface of a light directing element configured for total internally reflecting said f-number-increased light at a particular angle based, at least in part, on a curvature of said curved reflective interior surface, said f-number-increased light entering a light guide at a nonparallel angle that allows total internal reflection to occur in said light guide; and

transmitting said steered light to an energy converting device via said light guide, wherein the optical axis of said light guide is perpendicular to the optical axis of said light concentrator.

15. The method of claim 14, wherein said increasing said f-number of said incident light is performed by a curved surface of an optical element.

16. The method of claim 14, further comprising combining steered light from a plurality of said light collimating elements.

17. An apparatus comprising:

a light concentrator to convert incident light to converging light;

a light collimating element to receive the converging light and to reduce an angle of convergence of the converging light; and

a light directing element to re-direct and transfer the reduced-angle converging light along a portion of a light guide to transmit the directed light;

wherein at least two of the light collimating element, the light directing element, and the light guide may form a single optical element; and

wherein the light directing element comprises a curved reflective interior surface for total internally reflecting the light at a particular angle based, at least in part, on a curvature of the curved reflective interior surface, such that the total internally reflected light enters the light guide at a nonparallel angle that allows total internal reflection to occur in the light guide, and further wherein an optical axis of said light guide is perpendicular to an optical axis of said light concentrator.

18. The apparatus of claim 17, wherein the light collimating element and the light directing element form the single optical element.

19. The apparatus of claim 18, wherein the single optical element comprises at least one curved convex or concave surface to perform at least one function of the reducing the angle of convergence of the converging light and the directing the reduced-angle converging light along a portion of the light guide.

20. The apparatus of claim 18, further comprising a gap between the light guide and the single optical element.

21. The apparatus of claim 17, wherein the light directing element and the light guide form a single optical element.

22. The apparatus of claim 17, wherein the light collimating element and the light guide form a single optical element.

23. The apparatus of claim 17, wherein the light collimating element, the light directing element, and the light guide form a single optical element.

24. The apparatus of claim 23, wherein the single optical element comprises at least one curved surface to perform at least one function of the reducing the angle of convergence of the converging light and the directing the reduced-angle converging light along a portion of said light guide.

25. The apparatus of claim 23, wherein the single optical element comprises a shaped end having a curved surface, and wherein the shaped end comprises the light collimating element and the light directing element.

26. The apparatus of claim 23, wherein a side of the single optical element comprises a notch and another side of the single optical element comprises a convex or concave shaped surface, and wherein the notch comprises the light directing element and the indentation comprises the light collimating element.