Patent
1987-09-09
1989-10-03
Sugarman, Scott J.
350432, G02B 1514, G02B 1318
Patent
active
048712396
ABSTRACT:
The present invention provides a compact zoom lens system comprising; a first lens group having a positive refractive power; a second lens group having a negative refractive power located at the image side of the first lens group with a first variable air space between the first and second lens groups; and a third lens group having a positive refractive power, located at the image side of the second lens group with a second variable air space between the second and third lens groups, including a positive front lens unit and a positive rear lens located at the image side of the front lens unit with a third variable air space between the front and rear lens units, and having at least one aspheric surface; wherein the first lens group and the front and rear lens units of the third lens group are shiftable to the object side in the zooming operation from the shortest focal length to the longest focal length with changing the first, second and third variable air spaces.
REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4636040 (1987-01-01), Tokumaru
patent: 4639096 (1987-01-01), Kitagishi et al.
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4712883 (1987-12-01), Kato et al.
Fukushima Akira
Masumoto Hisayuki
Minolta Camera Kabushiki Kaisha
Sugarman Scott J.
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