The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 21, 1993
Filed:
May. 09, 1991
Robert E Levin, South Hamilton, MA (US);
Lieven A DeWeerdt, Edegem, BE;
GTE Products Corporation, Danvers, MA (US);
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.