Lamp assembly with LED light sources including threaded heat conduction base

• US 7,282,841 B2
• Filed: 11/01/2004
• Issued: 10/16/2007
• Est. Priority Date: 11/01/2004
• Status: Expired due to Fees

• Current Assignee: Taiwan Gigantic Light Electric Corporation Ltd.
• Original Assignee: Chia Mao Li
• Inventors: Li, Chia Mao
• Primary Examiner(s): Roy; Sikha
• Application Number:
  US10/978,089
• Publication Number:
  US 20060091772A1
• Time in Patent Office: 1,079 Days
• Field of Search: None
• US Class Current: 313/46
• CPC Class Codes: F21K 9/20 Light sources comprising attachment means
• CPC Class Codes: F21V 29/70 characterised by passive heat-dissipating elements, e.g. heat-sinks
• 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 29/89 Metals
• CPC Class Codes: F21V 33/0076 Safety or security signalisation, e.g. smoke or burglar alarms, earthquake detectors; Self-defence devices
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

An LED light source applied to surveillance cameras as an infrared source or a visible-light source has a light emitting diode (LED) as the light emitting mechanism. The LED chip is mounted on a surface of a metallic body of high thermal conductivity, the surface being planar for scattering light or convex for collimating light. The heat produced in the LED chip is quickly guided to a heat-sink structure much massive than the chip and having large contact area with a heat radiating structure, thereby effectively dissipating the heat and increasing the power capacity of the chip. The heat-sink structure has a plurality of elongated heat conducting members confined by an insulating bracket at one end and mounted on a metallic base on the other end. The metallic base can be coupled with a heat radiator to enhance heat radiation.

Claims

1. A lamp assembly with an LED light source, comprising:

a heat sink body including a bundle of elongated heat conducting members having a first end face for mounting an infrared light emitting chip and a second end face for connecting a front face of a heat-conduction base, said first and second end faces being selected from one of planar surfaces and convex surfaces, said heat conducting members being confined by an insulating bracket locating close to said first end face, whereby said heat sink body can absorb the heat produced in said infrared light emitting chip and quickly transfer the heat to said heat-conduction base;

the heat-conduction base having a first end and a second end;

the first end being provided with a screw thread, said screw thread at said first end for engaging a screw thread formed on an inner wall of a lampshade, said heat-conduction base being capable of absorbing and dissipating the heat conducted from said heat sink body;

the electrically insulating bracket for retaining and confining said heat conducting members of said heat sink body, said insulating bracket having an inner face attached on a front face of said heat-conduction base; and

an infrared light base installed at a second end of the heat conducting base;

an outer wall of the infrared light base being formed with a screw thread for engaging with the screw thread in an inner wall of the base shell, thereby securing the base shell and preventing damaging the screw thread

wherein an outer side of the lampshade is a round cylinder with a unique diameter;

the heat conduction base has a smooth cylinder after the screw thread thereof, diameters of the screw thread of the heat conduction base is smaller than that of the smooth cylinder; and

an outer side of the smooth cylinder has an unique diameter;

front face of the heat conduction base connecting the second end of the heat conducting member being a flat surface;

the diameter of the smooth cylinder is smaller than an outer diameter of the lampshade;

wherein wires that supply power to said LED light source are extended out from an end face of the heat conduction base; and

wherein the electrically insulating bracket is formed by two rounds, an inner round and an outer round, the inner round is inside the outer round, a plurality of radiating ribs serves to connect the inner round to an outer rounds.

2. The lamp assembly with an LED light source of claim 1 wherein said heat sink body is made of a metallic material of high thermal conductivity selected from gold, silver, copper and aluminum.

3. The lamp assembly with an LED light source of claim 1 wherein the geometry of said heat sink body is selected from a cylinder, a cube and an irregular polygon.

4. The lamp assembly with an LED light source of claim 1 wherein said heat conducting members of said heat sink body are retained by an insulating bracket and attached to said heat-conduction base, and wherein the number of said heat conducting members is determined by the power of said infrared light emitting chip, said insulting bracket therefore changing the diameter and the structure thereof accordingly.

5. The lamp assembly with an LED light source of claim 1 wherein said heat-conduction base is made of a metallic material of high thermal conductivity selected from gold, silver, copper and aluminum, and wherein said heat-conduction base is a part of the outer shell of said LED light source or is connected to an heat radiator that is selected to be a part of the outer shell of said LED light source.

6. The lamp assembly with an LED light source of claim 1 wherein an outer screw thread at said first end of said heat-conduction base can be connected to a unit selected from said infrared light base by engaging an inner screw thread thereof and a heat radiator of predetermined geometric structure.

7. The lamp assembly with an LED light source of claim 6 wherein said heat radiator is made of a metallic material and provided with heat releasing holes on an outer surface thereon.

8. The lamp assembly with an LED light source of claim 1 wherein said lampshade is made of a metallic material of high thermal conductivity selected from gold, silver, copper and aluminum.

9. The lamp assembly with an LED light source of claim 1 wherein said lampshade is secured with said heat-conduction base and assist heat dissipation, and wherein an inner wall of said lampshade forms a bowl-shaped surface and is provided with a protective lens over the front opening thereof.

10. The lamp assembly with an LED light source of claim 1, wherein the infrared light emitting chip includes light emitting diodes.