Illuminator assembly

• US 20070086197A1
• Filed: 12/04/2006
• Published: 04/19/2007
• Est. Priority Date: 09/30/2002
• Status: Active Grant

• Current Assignee: Seoul Semiconductor Co., Ltd.
• Original Assignee: Teledyne Lighting & Display Products, Inc. (Teledyne Technologies Incorporated)
• Inventors: Winston, Roland, Panagotacos, George, Pelka, David
• Granted Patent: US 7,344,280 B2
• Time in Patent Office: Days
• US Class Current: 362/294
• CPC Class Codes: A61C 19/004 Hand-held apparatus, e.g. guns
• CPC Class Codes: A61C 19/066 Bleaching devices; Whitening agent applicators for teeth, e.g. trays or strips
• CPC Class Codes: F21V 29/71 using a combination of separate elements interconnected by heat-conducting means, e.g. with heat pipes or thermally conductive bars between separate heat-sink elements
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48137 the bodies being arranged next to each other, e.g. on a common substrate
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/642 characterized by the shape
• CPC Class Codes: H01L 33/647 the elements conducting electric current to or from the semiconductor body
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An apparatus includes a lens having a light entrance end forming a recess defining a concave surface, a heat sink having an end portion facing the recess and a light source positioned to transmit light having a predetermined wavelength via the concave surface of the recess into the lens. The lens may be a non-imaging lens or a total internal reflection lens (TIR) configured to radiate optical radiation received at the concave surface. The light source is in thermal communication with the heat sink to conduct heat generated by the light source to the heat sink.

Claims

1. An apparatus, comprising

a lens having a light entrance end forming a recess defining a concave surface, wherein the lens is a non-imaging lens or a total internal reflection lens (TIR) configured to radiate optical radiation received at the concave surface;

a heat sink having an end portion facing the recess; and

a light source positioned to transmit light having a predetermined wavelength via the concave surface of the recess into the lens;

wherein the light source is in thermal communication with the heat sink to conduct heat generated by the light source to the heat sink.

2. The apparatus of claim 1, wherein the heat sink further comprises a metallic film formed on a surface thereof.

3. The apparatus of claim 2, wherein the metallic film is formed on the end portion of the heat sink facing the recess.

4. The apparatus of claim 2, wherein the light source is attached to the metallic film formed on the heat sink.

5. The apparatus of claim 1, wherein the light source comprises at least one LED.

7. The apparatus of claim 1, further comprising an annular interface board located on the end portion of the heat sink, the light source being positioned in a central aperture defined by the annular interface board.

8. The apparatus of claim 7, further comprising:

a metallic film formed a surface of the annular interface board to electrically connect the light source on the metallic film; and

at least one conductive pad formed on the annular interface board, wherein the light source receives electrical current through the at least one conductive pad through a first electrical connection of the light source.

9. The apparatus of claim 7, wherein the annular interface board comprises three conductive pads spaced 120°

apart.

10. The apparatus of claim 1, wherein the end portion of the heat sink forms an electrical contact to receive a second electrical connection of the light source.

11. The apparatus of claim 1, wherein the light source is configured to emit light having a predetermined visible wavelength forwardly toward the concave surface defined by the lens.

12. The apparatus of claim 1, wherein the concave surface defined by the recess is re-entrant into the lens and the lens includes a rearward portion extending about the recess and defines an outer surface that tapers in a direction toward the heat sink.

13. The apparatus of claim 1, wherein the recess comprises at least one of the following:

i) a curable optical plastic material having an index of refraction substantially the same as that that of the lens; and

ii) a light transmitting plastic material.

14. The apparatus of claim 1, wherein the light source is located at the end portion of the heat sink that faces the concave surface of the recess, and is in thermal communication with the end portion.

15. The apparatus of claim 1, wherein the lens and heat sink are coaxially aligned.

16. The apparatus of claim 1, further comprising a lens holder extending about the concave surface of the recess to receive the light entrance end of the lens.

17. The apparatus of claim 16, wherein the heat sink comprises a body that projects endwise into the lens holder.

18. The apparatus of claim 16, wherein the lens holder defines an inner wall that tapers in a direction toward the heat sink, the lens defining an outer surface that also tapers toward the heat sink and extends about the concave surface of the recess and in adjacent relation to the lens holder inner wall.

19. The apparatus of claim 16, further comprising wiring extending between the lens holder and the heat sink to supply electrical current to the light source.

20. The apparatus of claim 16, wherein the lens, the heat sink and the lens holder are coaxially aligned.

21. The apparatus of claim 16, wherein the lens comprises a forward cylindrical portion extending from the rearward portion of the lens to a light exit end of the lens.

22. The apparatus of claim 16, further comprising a housing extending about the heat sink in coaxial relation therewith to receive an end portion of the lens holder into the housing.

23. The apparatus of claim 16, wherein the heat sink comprises a metallic primary heat sink;

and a metallic secondary heat sink at an end of the primary heat sink opposite the concave surface of the recess.

24. An apparatus, comprising:

a lens having a light entrance end forming a recess defining a concave surface, the lens being a non-imaging lens or a total internal reflection (TIR) lens configured to radiate collimated optical radiation therethrough, the lens further comprising a rearward portion extending about the lens recess and defining an outer surface tapering to a smaller diameter; and

a lens holder comprising a front portion extending about the lens recess, the front portion defining a first cavity for receiving the light entrance end of the lens, and a rear portion defining a second cavity to receive the end portion of a heat sink therein, the lens holder defining an inner wall therein tapering to a smaller diameter in a direction from the front portion of the lens holder to the rear portion of the lens holder;

wherein the tapered outer surface of the lens further extends into the rear portion of the lens holder and the tapered outer surface of the lens is oriented in adjacent relation to the tapered inner wall of the lens holder.

25. The apparatus of claim 24, further comprising:

a light source facing the light entrance end of the lens to transmit light having a predetermined wavelength via the lens recess into the lens.

26. The apparatus of claim 25, wherein the light source comprises an LED.

27. The apparatus of claim 25, further comprising an annular interface board located on an end portion of a heat sink to receive the light source in a central aperture defined by the annular interface board.

28. The apparatus of claim 27, further comprising a metallic film formed on the interface board, wherein the light source is electrically connected to the metallic film formed on the interface board.

29. The apparatus of claim 27, wherein the interface board comprises a conductive pad formed on a surface thereof, and wherein electrical current is supplied to the light source through the interface board via the conductive pad.

30. The apparatus of claim 27, wherein the interface board comprises a plurality of conductive pads formed on a surface thereof.

31. The apparatus of claim 27, wherein the interface board comprises three conductive pads spaced 120°

apart.

32. The apparatus of claim 27, wherein light source forms an electrical contact with the heat sink.

33. The apparatus of claim 25, wherein the light source is configured to emit light having a predetermined visible wavelength forwardly toward the lens recess.

34. The apparatus of claim 25, wherein the lens recess is re-entrant into the lens and the lens includes a rearward wall that is concave toward the lens recess.

35. The apparatus of claim 25, wherein the lens recess contains at least one of the following:

i) a curable optical plastic material having an index of refraction substantially the same as that of the lens;

or

ii) a light transmitting plastic material.

36. The apparatus of claim 25, further comprising wiring extending between the lens holder and a heat sink to supply electrical current to the light source which comprises at least one LED.

37. The apparatus of claim 25, wherein the lens includes a forward cylindrical portion extending from the rearward portion of the lens to a light exit end of the lens.

38. The apparatus of claim 25, further comprising a housing extending about the lens holder heat sink in coaxial relation therewith and the lens holder having an end portion received into the housing.

39. The apparatus of claim 25, further comprising a heat sink having an end facing the lens recess, wherein the heat sink comprises a metallic primary heat sink;

and a metallic secondary heat sink at an end of the primary heat sink opposite the concave surface of the recess.