Claims
- 1. 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.
- 2. The headlight according to claim 1 wherein said forward opening is substantially planar and of a rectangular configuration, the ratio of the area of said rectangular opening to said focal length of said reflector being within the range of 6.0:1 to 37.5:1.
- 3. The headlight according to claim 2 wherein said area of said rectangular opening is within the range of 3.0 square inches to 7.5 square inches.
- 4. The headlight according to claim 1 wherein said length to diameter ratio of said coiled filament is 1:1.
- 5. The headlight according to claim 1 wherein the length of said filament is no greater than thirty percent of said focal length of said reflector.
- 6. The headlight according to claim 1 wherein said reflector includes a neck portion projecting from the rear of said reflector and including an aperture therein, said capsule further including a sealed end portion adjacent said envelope portion and positioned within said aperture to substantially prevent light scattering.
- 7. The headlight according to claim 6 wherein said capsule is a tungsten halogen capsule and said sealed end is a press sealed end.
- 8. The headlight according to claim 7 wherein said capsule further includes a pair of lead-in conductors electrically coupled to said coiled filament and being positioned substantially within said press sealed end and projecting therefrom.
- 9. The headlight according to claim 8 wherein said neck portion of said reflector includes a rear wall, each of the projecting portions of said lead-in conductors being positioned within and passing through said rear wall.
- 10. The headlight according to claim 1 wherein said cover secured to said forward opening of said reflector is a lens cover.
- 11. The headlight according to claim 10 wherein said lens cover includes a plurality of lensing elements located on an internal surface of said lens cover facing said lighting capsule.
- 12. The headlight according to claim 10 wherein said reflector is plastic and said lens cover is glass.
- 13. The headlight according to claim 1 wherein said filament is of coiled-coil construction and includes a pair of end segments each having therein a quantity of material for thermally quenching said end segments to prevent activation thereof during energization of said filament.
- 14. The headlight according to claim 13 wherein said lighting capsule further includes a pair of lead-in conductors, each of said conductors coupled to a respective one of said end segments of said filament.
Parent Case Info
This application is a continuation of application Ser. No. 826,526, filed Feb. 6, 1986, now abandoned.
US Referenced Citations (9)
Continuations (1)
|
Number |
Date |
Country |
Parent |
826526 |
Feb 1986 |
|