Sealed beam type reflective lamp

Details Sealed beam type reflective lamp Sealed beam type reflective lamp

1982-04-05

1985-01-29

Moore, David K.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

350432, 362340, H01K 130

Patent

active

044968728

ABSTRACT:
A sealed beam type reflective lamp has an envelope comprising a front lens and a reflector on the inner surface of which is formed a metal reflective film, and a tungsten coil filament arranged inside the front lens. The lamp has excellent converging effect and its light beam does not spread even if the filament is brought closer to the front lens. The front lens consists of a central circular lens element and a plurality of concentric ring-shaped prism elements. The inner surfaces of these prism elements define a stepped inner surface of the front lens. An angle formed by an inner surface of the prism lens element and the central axis of the lamp is greater than that of the prism lens element situated outward thereof. The step difference of the inner surfaces of the adjacent prism lens elements is 0.6 mm or less.

REFERENCES:
patent: 2191278 (1940-02-01), Johnson
patent: 2831394 (1958-04-01), Heenan et al.
patent: 3392277 (1968-07-01), Dawson
patent: 3743385 (1973-07-01), Schaefer
patent: 4039885 (1977-08-01), van Boekhold et al.
patent: 4152756 (1979-05-01), Wrege et al.
patent: 4158222 (1979-06-01), Cook
Lamps and Lighting, S. T. Henderson & A. M. Marsden, Thorn Lighting Ltd., pp. 172-179, 488-491, 1972.

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