Monolithic tiring condensing arrays and methods thereof

• US 7,980,727 B2
• Filed: 10/07/2008
• Issued: 07/19/2011
• Est. Priority Date: 10/07/2008
• Status: Expired due to Fees

• Current Assignee: Orafol Americas Inc. (Orafol Europe GmbH)
• Original Assignee: Penny Munro, Reflexite
• Inventors: Munro, Penny J., Munro, James F.
• Primary Examiner(s): Dzierzynski; Evan
• Application Number:
  US12/287,192
• Publication Number:
  US 20100085747A1
• Time in Patent Office: 1,015 Days
• Field of Search: 362/555, 362/235, 362/241, 362/249.02, 362/296.05, 362/327, 362/347, 362/102, 362/231, 362/332, 362/245, 362/244, 362/296.01, 362/237, 362/326, 359/853
• US Class Current: 362/231
• CPC Class Codes: F21K 9/00 Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
• CPC Class Codes: F21S 2/005 of modular construction
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2113/13 comprising an assembly of point-like light sources
• 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 19/0066 in the form of an LED array
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085

Abstract

A TIRing condensing array includes a plurality of condensing elements with at least one of the condensing elements having a first section and a second section. The first section provides substantially total internal reflection of light entering at a base of the first section. The second section tapers from the first section towards an optical axis extending through the first and second sections. The first and second sections are configured so a half-power angle of the light output from the second section is less than the half-power angle of the light entering the first section. At least one of the condensing elements is optically and mechanically connected to at least one other of the condensing elements at an attachment area between the condensing elements.

Claims

1. A condensing array comprising:

a plurality of condensing elements;

at least one light source positioned proximate to the condensing elements to transmit light into a first section of at least one of the condensing elements which are arranged with respect to the at least one light source to angularly condense the light;

at least one of the condensing elements having a first section that provides substantially total internal reflection of light entering at a base of the first section and a second section which tapers from the first section towards an optical axis extending through the first and second sections, the first and second sections are configured so a half-power angle of the light output from the second section is less than the half-power angle of the light entering the first section;

at least one of the condensing elements is optically and mechanically connected to at least one other of the condensing elements at an attachment area between the condensing elements.

2. The array as set forth in claim 1 wherein the attachment area is at least partially located in the first sections of the optically and mechanically connected condensing elements.

3. The array as set forth in claim 1 wherein the first section has at least one sidewall with a curvature to provide the substantially total internal reflection of light entering at the base of the first section.

4. The array as set forth in claim 1 wherein the second section has at least one sidewall which is substantially linear in cross-section and provides internal reflection and refraction of the light from the first section.

5. The array as set forth in claim 4 wherein the at least one sidewall of the second section tapers to an end point at the optical axis of the condensing element.

6. The array as set forth in claim 1 wherein the second section has at least one sidewall which is at least one of non-linear in cross-section, textured, and made from a light diffusing material.

7. The array as set forth in claim 1 wherein the half-power angle of the light output from the second section is less than or equal to about twenty degrees about the optical axis.

8. The array as set forth in claim 7 wherein the half-power angle of the light entering the first section is greater than or equal to forty degrees about the optical axis.

9. The array as set forth in claim 1 wherein a base of the first section for at least one of the condensing elements is substantially plano.

10. The array as set forth in claim 1 further comprising at least one transparent layer between the at least one light source and at least one of the condensing elements, wherein the at least one of the condensing elements increases an extraction efficiency of the transmitted light passing through the at least one transparent layer from the at least one light source.

11. The array as set forth in claim 10 wherein the light source is at least one light emitting diode.

12. The array as set forth in claim 10 further comprising a plurality of light sources positioned to transmit light into the first section of at least one of the condensing elements.

13. The array as set forth in claim 12 wherein the plurality of light sources comprise a red light source, a green light source, and a blue light source.

14. The array as set forth in claim 1 wherein the plurality of condensing elements are arranged in a two dimensional array.

15. The array as set forth in claim 1 further comprising wherein the first section and the second section of the at least one of the condensing elements are integrally formed together.

16. The array as set forth in claim 1 wherein the first section has two or more bases which merge into the second section of at least one of the condensing elements.

17. The array as set forth in claim 16 further comprising a plurality of light sources, each of the bases in the first section of at least one of the condensing elements having at least one of the light source positioned to transmit the light into the first section.

18. The array as set forth in claim 17 wherein the plurality of light sources comprise a red light source, a green light source, and a blue light source.

19. The array as set forth in claim 1 wherein at least one of the condensing elements is optically and mechanically connected to at least two other of the condensing elements at attachment areas between the condensing elements.

20. A method for making a condensing array, the method comprising:

forming a plurality of condensing elements, at least one of the condensing elements having a first section that provides substantially total internal reflection of light from a light source proximate to and entering at a base of the first section and a second section which tapers from the first section towards an optical axis extending through the first and second sections, the first and second sections are configured and positioned with respect to the light source so a half-power angle of the light output from the second section is less than the half-power angle of the light entering the first section to angularly condense the light; and

optically and mechanically coupling the at least one of the condensing elements to at least one other of the condensing elements at an attachment area between the condensing elements.

21. The method as set forth in claim 20 wherein the attachment area is located in the first sections of the optically and mechanically connected condensing elements.

22. The method as set forth in claim 20 further comprising forming the first section of the at least one of the condensing elements to have at least one sidewall with a curvature to provide the substantially total internal reflection of light entering at the base of the first section.

23. The method as set forth in claim 20 further comprising forming the second section of the at least one of the condensing elements to have at least one sidewall which is substantially linear in cross-section and provides internal reflection and refraction of the light from the first section.

24. The method as set forth in claim 23 wherein the forming the second section further comprises forming the at least one sidewall of the second section tapers to an end point at the optical axis of the condensing element.

25. The method as set forth in claim 20 wherein the forming the second section further comprises forming the at least one sidewall of the second section to be at least one of non-linear in cross-section, textured, and made from a light diffusing material.

26. The method as set forth in claim 20 wherein the half-power angle of the light output from the second section is less than or equal to about twenty degrees about the optical axis.

27. The method as set forth in claim 26 wherein the half-power angle of the light entering the first section is greater than or equal to forty degrees about the optical axis.

28. The method as set forth in claim 20 wherein a base of the first section for at least one of the condensing elements is substantially plano.

29. The method as set forth in claim 20 further comprising providing at least one transparent layer between the at least one light source and at least one of the condensing elements, wherein the at least one of the condensing elements increases an extraction efficiency of the transmitted light passing through the at least one transparent layer from the at least one light source.

30. The method as set forth in claim 20 wherein the light source is at least one light emitting diode.

31. The method as set forth in claim 20 further comprising positioning a plurality of light sources to transmit light into the first section of at least one of the condensing elements.

32. The method as set forth in claim 31 wherein the plurality of light sources comprise a red light source, a green light source, and a blue light source.

33. The method as set forth in claim 20 wherein the forming a plurality of condensing elements further comprises forming the plurality of condensing elements in a two dimensional array.

34. The method as set forth in claim 20 further comprising integrally forming the first section and the second section of the at least one of the condensing elements together.

35. The method as set forth in claim 20 wherein the first section has two or more bases which merge into the second section of at least one of the condensing elements.

36. The method as set forth in claim 35 further comprising a plurality of light sources, each of the bases in the first section of at least one of the condensing elements having at least one of the light source positioned to transmit the light into the first section.

37. The method as set forth in claim 36 wherein the plurality of light sources comprise a red light source, a green light source, and a blue light source.

38. The method as set forth in claim 20 wherein at least one of the condensing elements is optically and mechanically connected to at least two other of the condensing elements at attachment areas between the condensing elements.