Photography – Having variable focal length of camera objective
Patent
1997-01-09
1998-04-07
Adams, Russell E.
Photography
Having variable focal length of camera objective
396 85, 359704, 359700, 359696, G03B 1700
Patent
active
057376441
ABSTRACT:
A lens drive mechanism includes first and second members positioned adjacent to each other where the second member supports a lens group and is movable relative to the first member along an optical axis of the lens group, and a first guide shaft extending in a direction of the optical axis which is supported by the first member to be guided in the direction of the optical axis, where one end of the first guide shaft is secured to the second member. The lens drive mechanism also includes a gear rotatably supported on the first member, which does not move in the direction of the optical axis relative to the first member and has a hole at an axial center on an inner periphery of which is formed a first thread. The lens drive mechanism further includes a screw shaft on which a second thread is formed and which extends parallel to the first guide shaft where one end of the screw shaft is secured to the second member and the gear is rotatably fitted on the screw shaft with the first thread meshing with the second thread. A stopper plate is also provided which is secured to another end of each of the screw shaft and the first guide shaft, and in impact absorbing member is provided which is fitted on the first guide shaft adjacent to the stopper plate.
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United Kingdom Search Report.
Azegami Kazuyoshi
Nomura Hiroshi
Sasaki Takamitsu
Adams Russell E.
Asahi Kogaku Kogyo Kabushiki Kaisha
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