Illumination – Self powered lamp – With movable focusing element
Patent
1996-05-01
1998-09-15
Yeung, James C.
Illumination
Self powered lamp
With movable focusing element
362282, 362346, 362347, F21L 700
Patent
active
058069623
ABSTRACT:
An adjustable beam flashlight according to this invention is based in part on the teachings of Ellion U.S. Pat. Nos. 4,984,140 and 5,459,649 but adds important new concepts to describe a theoretical reflector having a broad beam that is uniformly illuminated with no bright and dull rings and no unilluminated center disc. This theoretical reflector requires manufacturing tolerances that are not available with conventional machine tools. A method is described to modify this theoretical reflector so that a practical reflector can be produced using existing machine tools. In one embodiment, the practical reflector surface is made up of a multitude of small concentric cones which reflect the light in the form of small fans. A uniformly illuminated broad beam is formed by fabricating specific groups of these cones of varying size and slope to form the reflector surface in order to project the light so as to overlap the required number of fans to produce the uniformity of illumination.
REFERENCES:
patent: 1991753 (1935-02-01), Kurlander
patent: 2125038 (1938-07-01), Tompkins et al.
patent: 4949231 (1990-08-01), Wang et al.
patent: 5459649 (1995-10-01), Ellion
Mon Donald D.
Yeung James C.
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