Headlight for vehicles, in particular motor vehicles

Details Headlight for vehicles, in particular motor vehicles Headlight for vehicles, in particular motor vehicles

1987-05-13

1988-07-05

Yeung, James C.

Illumination

Light source and modifier

With sealing means or artificial atmosphere

362294, F21V 2900

Patent

active

047559179

ABSTRACT:
A headlight for a motor vehicle in which an interior space is enclosed by a housing and a cover lens. The interior space communicates with the surrounding outside atmospheric air through a duct that has an inlet opening and an outlet opening. The duct contains reversably-acting hygroscopic desiccating substance which provides less resistance to flow of air into and out of the interior space, than any other leakage points in the headlight. The duct has a portion projecting into the interior space, and has a substantially high permeability for water molecules in a mixture of water-vapor and air. This portion of the duct resists air flow in establishing pressure equilibrium between the inlet opening and the outlet opening of the duct, so that at least a larger part of air in the duct passes through the inlet and outlet openings. One of these openings is in the interior space, whereas the other opening is located in the atmosphere. The aforementioned portion of the duct inhibits transmission of air through walls of the duct, so that maximum air flow passes through the hygroscopic desiccating substance.

REFERENCES:
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patent: 3593017 (1971-07-01), Cibie
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patent: 4323954 (1982-04-01), Florence et al.
patent: 4405974 (1983-09-01), Quiogue
patent: 4546420 (1985-10-01), Wheeler et al.
patent: 4635173 (1987-01-01), Dressler et al.

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