Headlamps having sealed optical units and replaceable light bulb

Details Headlamps having sealed optical units and replaceable light bulb Headlamps having sealed optical units and replaceable light bulb

1980-07-01

1982-08-10

Lechert, Jr., Stephen J.

Illumination

Light source and modifier

With sealing means or artificial atmosphere

362307, 362310, F21V 2900

Patent

active

043441190

ABSTRACT:
A vehicle headlamp has a sealed optical unit comprising a front lens, a reflector having a rear opening, and a transparent cup-shaped pocket fitted in the rear opening of the reflector. The cup-shaped pocket projects forwards into the space between the reflector and the front lens, so that light rays from a light bulb mounted within the pocket can reach the reflecting surface of the reflector, but the reflecting surface of the reflector is nonetheless inaccessible to contaminants from outside the headlamp. The lower part of the reflector should not reflect light rays from the light bulb, or at least from a dipped-beam filament of the light bulb, in order to avoid unwanted upwardly-directed rays being produced by the headlamp. Rays can be prevented from reaching the lower part of the reflector directly from the filament by means of a shield, while rays from the filament which are reflected from the surface of the transparent pocket are prevented from reaching the reflector by making the pocket with an outward flare towards the rear, so that any rays reflected by the pocket are directed towards the rear opening of the reflector, rather than towards the reflecting surface of the reflector.

REFERENCES:
patent: 3553519 (1971-01-01), Hicks

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