Integrated LED heat sink

• US 7,679,096 B1
• Filed: 08/21/2003
• Issued: 03/16/2010
• Est. Priority Date: 08/21/2003
• Status: Expired due to Fees

• Current Assignee: Excelitas Technologies Corporation (Excelitas Technologies Holdings LLC)
• Original Assignee: Opto Technology, Inc. (Revvity, Inc.)
• Inventors: Ruffin, Marvin
• Primary Examiner(s): Andujar, Leonardo
• Application Number:
  US10/645,474
• Time in Patent Office: 2,399 Days
• Field of Search: 257 81- 93, 257/712, 257/723, 257290-293, 257/675, 257/79, 257/98, 257/99, 257/720, 315/512
• US Class Current: 257/99
• CPC Class Codes: F21K 9/23 Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
• CPC Class Codes: F21V 17/10 characterised by specific fastening means or way of fastening F21V17/02 - F21V17/08 take precedence
• CPC Class Codes: F21V 17/12 by screwing
• 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 29/74 with fins or blades
• CPC Class Codes: F21V 29/77 with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
• CPC Class Codes: F21V 29/773 the planes containing the fins or blades having the direction of the light emitting axis
• CPC Class Codes: F21V 29/83 the elements having apertures, ducts or channels, e.g. heat radiation holes
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A heat sink for use with a high output LED light source is disclosed. The heat sink is used with an LED and conical reflector. The heat sink has a cylindrical back end holding the light emitting diode. The heat sink includes a conically shaped wall having an inner and outer surface and an open front end. The open front end has a rim with notches. The reflector has a front flat surface with arms which are fixed in the notches with a fastener. The heat sink includes a plurality of slits formed on the inner and outer surfaces extending between the back and front ends. A plurality of vanes extend radially from the inner surface. The heat sink is fabricated from a thermally conductive material. The conical shape of the heat sink, the slits and vanes increases exposed surface area to assist in dissipating heat generated from the LED.

Claims

1. A heat sink for use in conjunction with a light emitting diode light source, the heat sink comprising:

a base member having electrical connections;

a wall having a conically shaped portion, the conically shaped portion of the wall having an outer surface, an inner surface, a back end having a mounting aperture for a light emitting diode, an opposite open front end, and a plurality of slits through the conically shaped portion; and

a plurality of vanes extending radially inward from the inner surface.

2. The heat sink of claim 1 wherein the wall and base member are fabricated from a highly thermally conductive material.

3. The heat sink of claim 2 wherein the highly thermally conductive material is aluminum.

4. The heat sink of claim 1 wherein the front end includes a circular rim having a plurality of notches for the mounting of arms attached to a reflector.

5. A heat sink for use in conjunction with a light emitting diode light source, the heat sink comprising:

a wall having a conically shaped portion, the conically shaped portion having an open front end, a back end opposite the front end and a plurality of slits through the conically shaped portion, wherein the wall is fabricated of a highly thermally conductive material; and

a rectangular box-shaped base member, held by the back end and adapted so that a substrate plate including a light emitting diode may be attached to the base member.

6. The heat sink of claim 5, wherein the highly thermally conductive material is aluminum.

7. The heat sink of claim 5, further comprising a plurality of vanes extending radially inward from an inner surface of the wall.

8. The heat sink of claim 5 wherein the front end includes a circular rim having a plurality of notches.

9. The heat sink of claim 5 further comprising a clear reflector placed over the light emitting diode.

10. The heat sink of claim 5, wherein the base includes two depressions on opposite sides of the base running the full width of the base, parallel to the plane established by the open front end.