1986-11-25
1989-05-16
Corbin, John K.
350432, 350475, G02B 1502, G02B 1318, G02B 914
Patent
active
048304743
ABSTRACT:
A changeover type variable magnification optical system whose focal length is changed by locating an auxiliary lens on the image side of a master lens assembly. The system satisfies following inequalities of:
REFERENCES:
patent: 4394071 (1983-07-01), Yamada
patent: 4422734 (1983-12-01), Tanaka et al.
patent: 4596447 (1986-06-01), Yamada et al.
patent: 4634235 (1987-01-01), Fujioka
patent: 4728179 (1988-03-01), Hayashi et al.
Nakayama Hiroki
Oizumi Kouji
Sato Yasuhisa
Yamada Yasuyuki
Canon Kabushiki Kaisha
Corbin John K.
Kachmarik Ronald M.
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