LED lighting assembly and lamp utilizing same

• US 7,841,741 B2
• Filed: 04/02/2007
• Issued: 11/30/2010
• Est. Priority Date: 04/02/2007
• Status: Expired due to Fees

• Current Assignee: TTM Technologies North America, LLC (TTM Technologies Incorporated)
• Original Assignee: Endicott Interconnect Technologies Incorporated
• Inventors: Kozol, John E., Lauffer, John M., Lin, How T., Chan, Benson
• Primary Examiner(s): O Shea; Sandra L
• Assistant Examiner(s): ALLEN, DANIELLE NICOLE
• Application Number:
  US11/730,404
• Publication Number:
  US 20080238323A1
• Time in Patent Office: 1,338 Days
• Field of Search: 362/218, 362/224, 362/225, 362/227, 36224902-24913, 362/285, 362/287, 362/97.2, 362/294, 362/373
• US Class Current: 362/249.04
• 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: F21K 9/69 Details of refractors forming part of the light source
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• CPC Class Codes: F21V 29/85 characterised by the material liquid coolants F21V29/56
• CPC Class Codes: F21W 2131/202 for dentistry
• CPC Class Codes: F21W 2131/205 for operating theatres
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H05K 1/189 characterised by the use of a flexible or folded printed circuit H05K3/326 takes precedence
• CPC Class Codes: H05K 2201/10106 Light emitting diode [LED]
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence

Abstract

An LED lighting assembly including a plurality of individual LEDs mounted on a common, bendable heat sinking member designed to remove heat from the LEDs during operation and also to be formed (bent) to provide the desired light direction and intensity. Several such assemblies may be used within an LED lamp, as also provided herein. The lamp is ideal for use within medical and dental environments to assure optimal light onto a patient located at a specified distance from the lamp.

Claims

1. An LED lighting assembly comprising:

a bendable thermally conductive member having a first surface and including a substantially central portion and a plurality of projecting bendable portions;

a layer of dielectric material positioned on said first surface of said thermally conductive member, including on said substantially central portion and said plurality of projecting portions, but not being present beneath LEDs;

a circuit formed on said layer of dielectric material, said circuit adapted for being electrically coupled to a power source for providing electrical power to said LED lighting assembly;

a plurality of individually aligned LEDs, each of said LEDs including a body, a lens and a plurality of projecting conductive leads, selected ones of said LEDs being positioned directly on one of said bendable projecting portions of said thermally conductive member and electrically coupled to said circuit formed on said layer of dielectric material and adapted for receiving said electrical power from said power source, said layer of dielectric material including a plurality of openings therein, each of said LEDs being positioned within a respective one of said openings so as to be thermally coupled to said first surface of said thermally conductive member; and

a focusing lens having a removable lens member disposed proximate each of said LEDs for concentrating light beams generated thereby in a predetermined direction, whereby said LED light beams are converged to a predetermined area.

2. The LED lighting assembly of claim 1 wherein said thermally conductive member having said first surface, said substantially central portion and including said plurality of bendable projecting portions comprises a metal plate.

3. The LED lighting assembly of claim 2 wherein said metal plate is comprised of copper.

4. The LED lighting assembly of claim 1 wherein said layer of dielectric material positioned on said first surface of said thermally conductive member comprises a photoimageable material.

5. The LED lighting assembly of claim 1 wherein said circuit is comprised of copper.

6. The LED lighting assembly of claim 1 further including a plurality of simple lenses, each of said simple lenses being positioned adjacent a respective one of said LEDs for directing a light beam from said respective one of said LEDs in a predetermined direction.

7. The LED lighting assembly of claim 6 wherein said predetermined direction of said light beam from each of said simple lenses results in said light beams from each of said LED'"'"'s being focused on a fixed location at a pre-established distance from said LED lighting assembly.

8. The LED lighting assembly of claim 1 wherein at least one of said LEDs is positioned on said substantially central portion of said thermally conductive member and the remainder of said LEDs are positioned in a substantially annular pattern around said at least one LED positioned on said substantially central portion.

9. The LED lighting assembly of claim 8 wherein the number of said LEDs is seven.

10. The LED lighting assembly of claim 1 further including a plurality of quantities of thermal paste, each of said quantities of thermal paste positioned on said thermally conductive member within a respective one of said openings for bonding a respective one of said LEDs to said thermally conductive member.

11. An LED lamp comprising:

a housing;

a plurality of LED lighting assemblies spacedly positioned within said housing in a predetermined pattern, each of said LED lighting assemblies including a bendable thermally conductive member having a first surface and including a substantially central portion and a plurality of bendable projecting portions, a layer of photoimageable dielectric material positioned on said first surface of said thermally conductive member, including on said substantially central portion and said plurality of bendable projecting portions, but not beneath LEDs, a circuit formed on said layer of dielectric material, a plurality of LEDs, each of said LEDs including a body, a focusing lens having a removable lens member, and a plurality of projecting conductive leads, selected ones of said LEDs being positioned on one of said bendable projecting portions of said thermally conductive member and electrically coupled to said circuit formed on said layer of dielectric material, said layer of dielectric material including a plurality of openings therein, each of said LEDs being positioned within a respective one of said openings so as to be thermally coupled to said first surface of said thermally conductive member, whereby said LED light beams are converged to a predetermined area;

a light-transmitting cover positioned on said housing and adapted for having light beams emitted by said LED lighting assemblies pass therethrough during operation of said LED lamp; and

a connector for electrically connecting said circuits of each of said LED lighting assemblies to a power source for providing electrical power to said circuits so as to power each of said LED lighting assemblies.

12. The LED lamp of claim 11 wherein said plurality of LED lighting assemblies is spacedly positioned within said housing in a substantially annular pattern.

13. The LED lamp of claim 12 wherein the number of LED lighting assemblies is eight.

14. The LED lamp of claim 12 wherein each of said LED lighting assemblies includes seven LEDs.

15. The LED lamp of claim 12 further including a handle, said handle being secured to or forming part of said housing.

16. The LED lamp of claim 15 wherein said handle is substantially centrally positioned relative to said light-transmitting cover and said plurality of said LED lighting assemblies are positioned within said substantially annular pattern about said handle.

17. The LED lamp of claim 16 wherein each of said LED lighting assemblies provides a plurality of said light beams, said light beams of each of said LED lighting assemblies converging on a common focal location spaced from said LED lamp.

18. The LED lamp of claim 11 wherein each of said LED lighting assemblies further includes a plurality of simple lenses, each of said simple lenses being positioned adjacent a respective one of said LED'"'"'s within said LED lighting assemblies for directing a light beam from said respective one of said LEDs in a predetermined direction.

19. The LED lamp of claim 11 wherein each of said circuits of each of said LED lighting assemblies includes at least two lines, each of said lines of each of said circuits being electrically coupled to a respective one of said conductive leads of said LEDs of said LED lighting assembly.

20. The LED lamp of claim 11 wherein the total light output of said LED lamp is about 160,000 lux.