High efficiency vehicle headlights and reflector lamps
First Claim
1. An incandescent lamp assembly comprising:
- a reflector defining a cavity, said cavity including a shaped, light-directing surface;
a lens which closes the cavity of said reflector; and
an incandescent lamp capsule mounted with in said reflector, said incandescent lamp capsule comprising;
a hermetically sealed, light-transmissive envelope;
a fill material including an inert fill gas contained within said envelope;
at least one filament sealed in said envelope and supported by lead-in-wires; and
a specularly reflective coating on a portion of said envelope for reflecting radiation emitted by said filament and not directed to the shaped, light-directing surface of said reflector, said envelope, at least in the portion having said reflective coating, having an ellipsoidal shape with a central axis and wherein said filament is located on or near the axis of said ellipsodially-shaped envelope, such that said reflective coating reflects radiation emitted by said filament back to said filament.
1 Assignment
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Accused Products
Abstract
An incandescent lamp assembly, such as an automobile headlight, includes a reflector defining a cavity having a reflecting surface, and an incandescent lamp capsule mounted within the reflector. The incandescent lamp capsule, typically a tungsten halogen incandescent lamp capsule, includes a light-transmissive envelope, a filament sealed in the envelope and a fill material including an inert gas and a halogen additive. A specularly reflective coating is formed on a portion of the envelope for reflecting visible light and infrared radiation emitted by the filament and not directed to the reflecting surface of the reflector. The envelope is ellipsoidally shaped, at least in the portion having the reflective coating, so that the reflective coating reflects visible light and infrared radiation emitted by the filament back to the filament. The reflective coating limits glare and increases the operating efficiency of the headlight.
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Citations
28 Claims
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1. An incandescent lamp assembly comprising:
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a reflector defining a cavity, said cavity including a shaped, light-directing surface; a lens which closes the cavity of said reflector; and an incandescent lamp capsule mounted with in said reflector, said incandescent lamp capsule comprising; a hermetically sealed, light-transmissive envelope; a fill material including an inert fill gas contained within said envelope; at least one filament sealed in said envelope and supported by lead-in-wires; and a specularly reflective coating on a portion of said envelope for reflecting radiation emitted by said filament and not directed to the shaped, light-directing surface of said reflector, said envelope, at least in the portion having said reflective coating, having an ellipsoidal shape with a central axis and wherein said filament is located on or near the axis of said ellipsodially-shaped envelope, such that said reflective coating reflects radiation emitted by said filament back to said filament. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A vehicle headlight comprising:
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a reflector defining a cavity, said cavity including a shaped, light-directing surface having a focal point; a lens which closes the cavity of said reflector; and an incandescent lamp capsule mounted within said reflector, said incandescent lamp capsule comprising; a hermetically sealed, ellipsoidally-shaped, light-transmissive envelope having a central axis; a fill material including an inert fill gas and a halogen additive contained within said envelope; a filament sealed in said envelope and supported by lead-in wires, said filament being located at or near the focal point of said reflector and being disposed along or near the central axis of said envelope; and a specularly reflective coating on a portion of said envelope, said reflective coating being configured to block direct transmission of radiation from said filament to said lens and to portions of said reflector other than said shaped, light-directing surface, and to reflect radiation emitted by said filament back to said filament. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification