Headlamp for vehicle

• US 20120062117A1
• Filed: 09/12/2011
• Published: 03/15/2012
• Est. Priority Date: 09/13/2010
• Status: Active Grant

• Current Assignee: DENSO Corporation, Nippon Soken, Inc.
• Original Assignee: DENSO Corporation, Nippon Soken, Inc.
• Inventors: Tominaga, Motonori, Kamizono, Tsutomu
• Granted Patent: US 8,531,108 B2
• Time in Patent Office: Days
• US Class Current: 315/82
• CPC Class Codes: F21S 41/143 the main emission direction of the LED being parallel to the optical axis of the illuminating device
• CPC Class Codes: F21S 45/47 Passive cooling, e.g. using fins, thermal conductive elements or openings

Abstract

A headlamp for a vehicle includes: a housing having a front opening; a lens cover arranged to cover the front opening of the housing; a lamp chamber defined by the housing and the lens cover; a light source provided in the lamp chamber; a lighting control circuit that controls lighting of the light source; and a heat dissipating member arranged in the lamp chamber. Further, the lighting control circuit is formed on a substrate. The heat dissipating member has a pillar portion and a plurality of heat dissipating fins. The pillar portion has the light source mounted thereto. The heat dissipating fins are provided on an outer periphery of the pillar portion so as to be spaced from one another. The pillar portion also has a recess formed therein. The substrate is received in the recess of the pillar portion.

Claims

1. A headlamp for a vehicle, the headlamp comprising:

a housing having a front opening;

a lens cover arranged to cover the front opening of the housing;

a lamp chamber defined by the housing and the lens cover;

a light source provided in the lamp chamber;

a lighting control circuit configured to control lighting of the light source; and

a heat dissipating member arranged in the lamp chamber to dissipate heat generated by the light source,

wherein

the lighting control circuit is formed on a substrate;

the heat dissipating member has a pillar portion and a plurality of heat dissipating fins,

the pillar portion has the light source mounted thereto;

the heat dissipating fins are provided on an outer periphery of the pillar portion so as to be spaced from one another,

the pillar portion also has a recess formed therein, and

the substrate is received in the recess of the pillar portion.

2. The headlamp as set forth in claim 1, wherein the recess is formed to extend along a longitudinal direction of the pillar portion, and

the substrate is received in the recess with a longitudinal direction of the substrate coinciding with the longitudinal direction of the pillar portion.

3. The headlamp as set forth in claim 1, wherein the lighting control circuit includes a plurality of high-heat-generating elements and a plurality of low-heat-generating elements that generate less heat than the high-heat-generating elements, and

the distances from the high-heat-generating elements to an interior surface of the pillar portion which defines the recess are less than a predetermined value.

4. The headlamp as set forth in claim 1, wherein the lighting control circuit includes a plurality of high-heat-generating elements and a plurality of low-heat-generating elements that generate less heat than the high-heat-generating elements, and

the high-heat-generating elements are located closer to a longitudinal axis of the pillar portion than the low-heat-generating elements are.

5. The headlamp as set forth in claim 1, wherein the recess of the pillar portion is so formed that the shape of the recess conforms to that of the substrate on which the lighting control circuit is formed.

6. The headlamp as set forth in claim 1, wherein the light source is mounted on an upper end face of the pillar portion of the heat dissipating member.

7. The headlamp as set forth in claim 1, wherein the heat dissipating member further has a heat dissipating plate mounted on an upper end face of the pillar portion, and

the light source is mounted to the heat dissipating plate.

8. The headlamp as set forth in claim 1, wherein the light source is mounted on a front part of a side surface of the pillar portion.

9. The headlamp as set forth in claim 1, wherein the recess is formed in a side surface of the pillar portion to have an opening that opens on the side surface, and

the heat dissipating fins are arranged on the side surface of the pillar portion except for the opening of the recess so as to each extend radially from the side surface.

10. The headlamp as set forth in claim 1, wherein the pillar portion further has an injection hole formed therein, and

a filling material is injected in the recess through the injection hole.

11. The headlamp as set forth in claim 1, wherein the substrate has a temperature sensing element mounted thereon.