Zoom lens system for camera
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United States of America Patent
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Dec 29, 1981
Grant Date -
N/A
app pub date -
Nov 18, 1980
filing date -
Nov 19, 1979
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A zoom lens system for a camera comprises a focusable lens, a variator lens for making a focal length of the lens system variable and a compensator lens for compensating the displacement of its image point caused by the variator lens. A zoom operating sleeve is provided which is rotatable about an optical axis and formed on its inner surface with first and second cam surfaces according to which lens holders for the variator and compensator lenses are respectively controlled in relative movement with the aid of a spring for resiliently urging the lens holders against the cam surfaces.
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