1986-11-14
1989-08-08
Arnold, Bruce Y.
G02B 964, G02B 1514
Patent
active
048546810
ABSTRACT:
A compact zoom lens comprising, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power axially movable in one direction when zooming from one end of a range of image magnification to the other, a third lens unit of positive power axially movable in a path convex toward the rear to maintain the constant position of an image surface which shifts with zooming, and a fourth lens unit of positive power for forming an image which remains stationary during zooming, wherein a fixed diaphragm is arranged in a space between the second and third lens units.
REFERENCES:
patent: 4439017 (1984-03-01), Yamaguchi
patent: 4666257 (1987-05-01), Tanaka et al.
Kato Masatake
Sugiura Muneharu
Tanaka Kazuo
Tsuji Sadahiko
Arnold Bruce Y.
Canon Kabushiki Kaisha
Gass Rebecca D.
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