Vehicle headlight discharge lamp
AssigneeDenso Corporation
InventorHironao Yamaguchi
Life of this patent
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Abstract
A vehicle head lamp has a lighting control circuit that is cooled in temperature by positioning a portion of the lighting control circuit exterior to the lamp housing to use outside air as coolant to reduce thermal loads applied to circuit elements. The lamp housing defines an opening at a side of the lighting control circuit. An end surface of the lighting control circuit is exposed to the opening to an exterior side of the lamp housing. A flexible, annular diaphragm is fixed to the lamp housing around the peripheral portion of the opening. An inner circumferential portion of the diaphragm contacts a peripheral portion of the lighting control circuit to effectively seal around the lighting control circuit.
Claims18
A vehicle head lamp comprising:
- a discharge lamp bulb;
- a reflector for reflecting light emitted from the discharge lamp bulb;
- a lighting control circuit fixed onto a rear surface of the reflector and directly connected to the discharge lamp bulb for lighting the discharge lamp bulb;
- a seal member formed by a flexible material substantially in an annular shape;
- and
- a lamp housing in which the discharge lamp bulb, the reflector and the lighting control circuit are contained, the lamp housing defining an opening at a side of the lighting control circuit, wherein:
- an end portion of the lighting control circuit is exposed through the opening exterior to the lamp housing;
- an outer circumferential portion of the seal member is tightly fixed to the lamp housing around a peripheral portion of the opening;
- and
- an inner circumferential portion of the seal member contacts a peripheral portion of the lighting control circuit.
Dependencies are inferred from the claim text.