Variable beamwidth stage light
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1987
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A variable beamwidth stage light relying upon an axially movable reflector for changes in beamwidth. The reflector has a plurality of radially outwardly and axially forwardly extending leaves in side-by-side relation to define a bowl-shaped reflector surface. A stationary support flange is in frictional contact with the radially outward surface of each leaf. The reflector leaves are sandwiched between a base member and a ring member at the base of the reflector. A motor driven lead screw is attached to the base member to cause axial movement of the reflector relative to the support flange. The reflector defines a first and a second focal point along the axis of the reflector. A light source is fixed at the first focal point, which remains substantially fixed relative to the base member. Contact of the support flange with the reflector leaves causes the diameter of the reflector leaves to vary as the base member is moved, thereby causing displacement of the second focal point and variation of the bandwidth issuing from the reflector.
First Claim
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International Classification(s)
Cited Art Landscape
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