Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1990-10-01

1992-02-04

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1514, G02B 1318

Patent

active

050863568

ABSTRACT:
A compact zoom lens system having from the object side to the image side a first lens unit of positive refractive power, a second lens unit of negative refractive power with a first variable air space formed between the first and second lens units, a third lens unit of positive refractive power and a fourth lens unit of negative refractive power with a second variable air space formed between the third lens unit and the fourth lens unit. The first lens unit, the fourth lens unit and at least one of the second and third lens units are shiftable from the image side to the object side so that the first variable air space increases and the second variable air space decreases in the zooming operation from the shortest focal length to the longest focal length. The third lens unit and/or the fourth lens unit can have an aspherical surface.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4673258 (1987-06-01), Masumoto
patent: 4701033 (1987-10-01), Masumoto
patent: 4702567 (1987-10-01), Kato
patent: 4773744 (1988-09-01), Yamanashi
patent: 4787719 (1988-11-01), Imai
patent: 4789226 (1988-12-01), Ogata
patent: 4789229 (1988-12-01), Yamanashi
patent: 4822152 (1989-04-01), Yamanashi
patent: 4844600 (1989-07-01), Tokumaru
patent: 4854682 (1989-08-01), Yamanashi

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