LED light source assembly

• US 7,093,958 B2
• Filed: 03/17/2004
• Issued: 08/22/2006
• Est. Priority Date: 04/09/2002
• Status: Active Grant

• Current Assignee: Suzhou Lekin Semiconductor Company Limited
• Original Assignee: OSRAM Sylvania Inc. (Ams-Osram AG)
• Inventors: Coushaine, Charles M.
• Primary Examiner(s): Sember, Thomas M.
• Assistant Examiner(s): Rehm, Adam C.
• Application Number:
  US10/802,517
• Publication Number:
  US 20050024870A1
• Time in Patent Office: 888 Days
• Field of Search: 362/245, 362/247, 362/249, 362/507, 362/516, 362/545, 362/547, 362/800, 362/235, 362/241, 362/294, 362/362, 362/373
• US Class Current: 362/249.02
• 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: F21V 29/505 of reflectors
• CPC Class Codes: F21V 29/74 with fins or blades
• CPC Class Codes: F21V 7/0008 providing for indirect lighting
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A compact LED light source providing intensive LED positioning along with thermal dissipation can be made with a heat conductive plate supporting a plurality of LEDs mounted on the plate and in thermal contact with the plate. The plate further supports electrical circuitry providing electrical connection to the LEDs. A heat conductive stem mechanically supports the plate and may provide a thermal conduction path from the plate away from the LEDs. A high concentration of LED can then be conveniently mounted and held in close proximity for increased optical system intensity, while providing a thermal exit path for the associated increase in heat concentration.

Claims

1. A light source comprising:

a solid heat conductive plate having a first side and a second side;

a plurality of LEDs supported on the first side of the plate;

electrical circuitry supported on a side of the plate providing electrical connection to the LEDs; and

a heat conductive stem extending transversely to the plate and supporting the plate wherein the heat conductive stem supporting the plate in combination with the plate define at least one recess surrounding at least one LED having a surface wall generally facing the LED and reflecting light from the recess.

2. The LED lamp in claim 1, wherein electrically insulating guides with progressively narrower diameters guide the leads in the stem.

3. A light source comprising:

a heat conductive stem having an axis, the stem extending axially from a base end to a distal end, and having at least one axially extending through passage;

a solid, heat conductive plate having a first side and a second side;

the plate being mounted on the distal end of the stem with the first side facing towards the base end;

the plate extending transversely to the axis, the plate having a greater radial extension than a radial extension of the stem adjacent the mounting to the plate whereby the radial periphery of the plate overhangs the stem;

a plurality of LEDs supported on the first side of the plate along the radial periphery of the first side;

electrical circuitry supported on a side of the plate providing electrical connection to the LEDs;

at least one electrical lead extended through the through passage and electrically coupled to the circuitry supported on the plate; and

having a cap covering the second side of the plate;

wherein the cap is coupled through a passage in the plate to the stem thereby retaining plate between the stem and the cap.

4. A light source comprising:

a heat conductive stem having an axis, the stem extending axially from a base end to a distal end, and having at least one axially extending through passage;

a solid, heat conductive plate having a first side and a second side;

the plate being mounted on the distal end of the stem with the first side facing towards the base end;

the plate extending transversely to the axis, the plate having a greater radial extension than a radial extension of the stem adjacent the mounting to the plate whereby the radial periphery of the plate overhangs the stem;

a plurality of LEDs supported on the first side of the plate along the radial periphery of the first side;

electrical circuitry supported on a side of the plate providing electrical connection to the LEDs; and

at least one electrical lead extended through the through passage and electrically coupled to the circuitry supported on the plate;

wherein at least one electrically insulating guide with a progressively narrower diameter guides the at least one lead in the stem.