# US 2019/0376679 A1 · Vehicular headlight

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- Number: US 2019/0376679 A1
- Document ID: US20190376679A1
- Status: Published application
- Kind: A1
- Application number: 16/488,672
- Filed: 2018-02-26
- Published: 2019-12-12
- Earliest claimed: 2017-02-27
- Assignees: Ichikoh Industries, Ltd.
- Applicants: Ichikoh Industries, Ltd.
- Inventors: Satoru ISHII
- Web page: https://patentgrep.com/patent/US20190376679A1

## CPC

- F21V 29/677: {the fans being used for discharging}
- F21S 41/147: the main emission direction of the LED being angled to the optical axis of the illuminating device
- F21S 41/657: by moving light sources
- F21S 45/43: using gas
- F21V 29/83: the elements having apertures, ducts or channels, e.g. heat radiation holes
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS

## Abstract

To provide a vehicular headlight which, by using a fan, can efficiently cool a light source through a heat sink and also efficiently cool a light source drive circuit, a vehicular headlight (1) according to the present invention includes a lamp housing (10), a lamp lens (11), a lamp unit (2), a fan (3), and a light source drive circuit (4). The lamp unit (2) includes a light source (20), a heat sink (5), and a light control member (6). An outlet side of the fan (3) faces the heat sink (5), and an intake side of the fan (3) faces the light source drive circuit (4). Consequently, by using the fan (3), the present invention can efficiently cool the light source (20) through the heat sink (5) and also efficiently cool the light source drive circuit (4).

## Claims

### Claim 1

A vehicular headlight comprising:
a lamp housing and a lamp lens that form a lamp chamber;
a lamp unit disposed in the lamp chamber and attached to the lamp housing via an optical axis adjustment mechanism; and
a fan and a light source drive circuit disposed in the lamp chamber and attached to the lamp housing separately from the lamp unit,
wherein the lamp unit includes a light source driven by the light source drive circuit, a heat sink, and a light control member arranged to control light from the light source, and
an outlet side of the fan faces the heat sink, and an intake side of the fan faces the light source drive circuit.

### Claim 2 (depends on 1)

The vehicular headlight according to claim 1, wherein the heat sink includes a mounting portion to which the light source is attached, and a plurality of heat radiating portions having a columnar shape, provided on an opposite side of the mounting portion to the light source, and facing the outlet side of the fan.

### Claim 3 (depends on 1)

The vehicular headlight according to claim 1, wherein the light source drive circuit includes a casing attached to the lamp housing, a substrate on which an electronic component is mounted, and a heat conductive medium with which a portion of the casing, the portion being on the intake side of the fan, and the substrate are closely fixed to each other.

### Claim 4 (depends on 1)

The vehicular headlight according to claim 1, wherein the light control member faces the outlet side of the fan through the heat sink.