1987-10-08
1988-12-06
Corbin, John K.
350428, G02B 1500
Patent
active
047892277
ABSTRACT:
A zoom lens which performs focusing by using part of a movable lens unit. In zooming, a lens unit V for changing the focal length of the entire system and another lens unit C for maintaining the constant position of an image plane move in certain relation to each other. For all objects in the focusing range, a part of either the aforesaid lens unit V or the aforesaid lens unit C is made to move to effect focusing at any station in the entire zooming range, thereby the zoom lens can be constructed in compact form.
REFERENCES:
patent: 3661445 (1972-05-01), Someya
Ikemori Keiji
Kato Masatake
Tanaka Kazuo
Tanaka Tsunefumi
Canon Kabushiki Kaisha
Corbin John K.
Dzierzynski P. M.
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