1986-06-26
1987-03-31
Corbin, John K.
350423, G02B 1516
Patent
active
046538747
ABSTRACT:
A zoom lens having at least three components, or, from front to rear, a first component of positive power, a second component of negative power and a third component with the air separations between the successive two of said three components being varied to effect zooming, whereby said first component is constructed with, from front to rear, a bi-convex first lens, a second lens of negative power and a third lens of positive power.
REFERENCES:
patent: 2433438 (1947-12-01), Cox
patent: 3604786 (1971-09-01), Baker
patent: 3796481 (1974-03-01), Fujii
Asano Toshiaki
Fujibayashi Kazuo
Kato Masatake
Takahashi Sadatoshi
Tsuji Sadahiko
Canon Kabushiki Kaisha
Corbin John K.
Dzierzynski P. M.
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