1989-03-20
1990-11-20
Arnold, Bruce Y.
350255, 35419512, G02B 1500, G02B 702
Patent
active
049714279
ABSTRACT:
A drive mechanism for a zoom lens system consisting of first and second lens groups has a movable lens barrel fixedly holding the first lens and cam structure consisting of a cam member provided on the second lens group and a cam follower member on the movable lens barrel. The movable lens barrel moves forward or rearward to shift the second lens group forward or rearward relative to the first lens group along the optical axis of the zoom lens system via the cam member so as to continuously change the focal length of the zoom lens system. The cam member is mounted on the movable lens barrel to change the curve of the cam surface relative to the cam follower member only in a middle focal length range.
REFERENCES:
patent: 4747669 (1988-05-01), Yamada et al.
patent: 4748466 (1988-05-01), Yamada et al.
patent: 4799073 (1989-01-01), Asano et al.
Hirai Masayoshi
Kobayashi Kiyotaka
Nishizawa Tetuo
Shoji Masao
Takamura Masashi
Arnold Bruce Y.
Ben Loha
Fuji Photo Film Co. , Ltd.
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