Lamp and reflector assembly

Details Lamp and reflector assembly Lamp and reflector assembly

1991-05-09

1993-12-21

Yusko, Donald J.

Electric lamp and discharge devices

With optical device or special ray transmissive envelope

Reflector

313114, 313116, 362296, 362297, F21V 700

Patent

active

052724085

ABSTRACT:
A lamp assembly includes a reflector having a concave reflecting surface and an axis of rotation, and a light source including a filament mounted at or near a focal point of the reflecting surface. The filament has a length to diameter ratio of 6:1 or greater. The reflecting surface is formed as a multiplicity of reflecting facets. The facets on at least 50% of the reflecting surface have dimensions and curvatures selected to produce a light pattern wherein a ratio of filament width spread to filament length spread produced by the facets is at least 2:1. Preferably, the facets are arranged in axially adjacent rings. The facet rings can be successively offset in a rotational direction so as to reduce circumferential variations in the light pattern.

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R. Hopkins, "Mirror and Prism Systems"; Applied Optics and Optical Engineering, vol. III; Academic Press, 1965, pp. 269 to 308.

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