| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a vehicle head lamp which has a compact outer shape of a lighting fixture, and a simple configuration in a lamp chamber, and furthermore, can effectively cool both a light emitting device and a lighting circuit. <P>SOLUTION: In the vehicle head lamp in which a light source unit 30 for light distribution formation having a metallic heat transfer member 31 fitted with a light emitting device 34 serving as a light source is housed in the lamp chamber S, and a blower fan 50 to cool the light emitting device 34 is provided in the lamp chamber S, the light emitting device 34 and the lighting circuit 42 are effectively cooled by disposing the lighting circuit 42 to control lighting of the light emitting device 34 in the metallic heat transfer member 31 which is a light source unit constituent member via a cylindrical type ventilation passage 60, guiding air distribution of the blower fan 50 fitted with the metallic heat transfer member 31 into the cylindrical type ventilation passage 60 located between the metallic heat transfer member and the lighting circuit, and promoting and heat dissipation from the metallic heat transfer member 31 and the lighting circuit 42. <P>COPYRIGHT: (C)2011,JPO&INPIT |
