Motor vehicle headlight
AssigneeGTE Products Corporation
InventorsRobert E. Levin, George J. English
Life of this patent
Estimating the term…
Abstract
A motor vehicle headlight including a parabolic reflector, a cover secured to the reflector and a lighting capsule located within the reflector. The capsule includes an envelope having a coiled filament located therein and including a substantially cylindrical configuration. Optimum light output is attained by providing the reflector with a short focal length (0.2 inch to about 0.5 inch) and by utilization of a coiled filament structure having a length to diameter ratio of less than about 2:1. The result is a headlight having an overall vertical height of only about two inches and a corresponding frontal area of extremely small size (between 3.0 and 7.5 square inches).
Claims14
A motor vehicle headlight comprising:
- a reflector having a concave reflecting portion of substantially parabolic configuration defining a forward opening, said reflector having a focal length within the range of 0.2 inch to 0.5 inch;
- a cover secured to said reflector for providing a cover for said opening;
- and
- a lighting capsule located within said reflector and including an envelope portion having a coiled filament positioned therein and having a substantially cylindrical configuration, said capsule being located within said reflector such that said envelope portion is positioned within and substantially surrounded by said concave reflecting portion and said coiled filament is substantially centered at the focal point of said reflector, said coiled filament having a length to diameter ratio of less than 2:1.
Dependencies are inferred from the claim text.