Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-12-09
1999-11-09
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
G03B 1700
Patent
active
059830328
ABSTRACT:
A lens drive device for a zoom optical system drives first and second lenses along an optical axis with a single drive source. A transmission mechanism connects the drive source and the first and second lenses. The transmission mechanism transmits drive to the first lens during a first motion range and to the first and second lenses during a second motion range. A focal length of the optical system changes in the first motion range and a focal point position of the optical system changes in the second motion range. The first and second lenses respectively moves in response to movement of a first and second feed screw. A first gear transmits drive from the drive source to the first feed screw while a second gear intermittently transmits drive from the drive source to the second feed screw. A lock lever interlocks with the second gear in response to rotation of a large diameter section of the first gear to thereby arrest movement of the second gear and second feed screw. A spring urges the lock lever into contact with the second gear.
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Nikon Corporation
Perkey W. B.
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