Convectively cooled headlamp assembly

• US 20070091632A1
• Filed: 10/25/2005
• Published: 04/26/2007
• Est. Priority Date: 10/25/2005
• Status: Active Grant

• Current Assignee: Varroc Lighting Systems S.R.O. (Varroc Engineering Limited)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Lemecha, Myron, Glovatsky, Andrew, Reddy, Prathap
• Granted Patent: US 7,329,033 B2
• Time in Patent Office: Days
• US Class Current: 362/547
• CPC Class Codes: B60Q 1/0052 concentric
• CPC Class Codes: F21S 41/145 the main emission direction of the LED being opposite to the main emission direction of the illuminating device
• CPC Class Codes: F21S 41/148 the main emission direction of the LED being perpendicular to the optical axis
• CPC Class Codes: F21S 41/153 arranged in a matrix
• CPC Class Codes: F21S 41/172 High-intensity discharge light sources
• CPC Class Codes: F21S 45/43 using gas
• CPC Class Codes: F21S 45/48 with means for conducting heat from the inside to the outside of the lighting devices, e.g. with fins on the outer surface of the lighting device
• CPC Class Codes: F21V 29/673 the fans being used for intake
• 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 29/763 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 headlamp assembly for a motor vehicle including a lens and a housing that cooperate to define an inner chamber that is generally isolated from the atmosphere. A heat sink includes a fin portion that extends from the inner chamber so as to be exposed to ambient air. A light source is located within the inner chamber and is supported on a base portion of the heat sink. The heat sink conducts heat from the light source to air located exterior of the chamber.

Claims

1. A headlamp assembly for a motor vehicle comprising:

a lens;

a housing, the housing and the lens cooperating to at least partially define an inner chamber that is generally fluidly isolated from the atmosphere;

a heat sink having a base portion positioned within the inner chamber and a fin portion extending beyond the inner chamber to a location exposed to ambient air;

a light source located within the chamber and being supported on the base portion of the heat sink; and

a reflector positioned within the housing and adapted to reflect light from the light source.

2. A headlamp assembly as in claim 1, wherein the fin portion of the heat sink extends rearward through the housing such that hear from the inner chamber is conducted through the heat sink to air flow across the housing.

3. A headlamp assembly as in claim 1, further including a flow channel positioned adjacent the housing, and having an inlet and an outlet, the fin portion of the heat sink extending into the flow channel such that heat from within the inner chamber is conducted through the heat sink to air within the flow channel.

4. A headlamp assembly as in claim 3, wherein the inlet of the flow channel is oriented in the forward direction and forward motion of the vehicle will cause air to be forced into the flow channel.

5. A headlamp assembly as in claim 3, wherein the inlet of the flow channel is located adjacent to a bottom portion of the headlamp assembly and the outlet is located adjacent to a top portion of the headlamp assembly.

6. A headlamp assembly as in claim 3, further including a fan mounted within the flow channel, the fan being adapted to draw air into and push air through the flow channel.

7. A headlamp assembly as in claim 3, wherein the flow channel is positioned behind the housing and the fin portion of the heat sink extends rearward, through the housing into the flow channel.

8. A headlamp assembly as in claim 3, wherein a plurality of flow channels are spaced circumferentially around and positioned radially outward of the inner chamber, the fin portion of each heat sink extending radially outward, through the housing, into the adjacent flow channels.

9. A headlamp assembly as in claim 1 wherein the light sources are light emitting diodes.

10. A headlamp assembly as in claim 1 wherein the light source is a high intensity discharge lamp.

11. A headlamp assembly as in claim 1, wherein the fin portion of the heat sink extends forward through the lens, such that heat from within the inner chamber is conducted through the heat sink to air flowing across the lens.

12. A headlamp assembly as in claim 1, wherein a plurality of light sources are mounted onto the base portion of a common heat sink.

13. A headlamp assembly as in claim 1, wherein the heat sink is made from a conductive material.

14. A headlamp assembly as in claim 1, wherein the heat sink is made from a material selected from the group:

metal, metal alloy, silicon, and graphite.

15. A headlamp assembly as in claim 1, wherein the housing is made from a conductive material to further conduct heat from the inner chamber.