Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1984-11-09

1986-06-03

Corbin, John K.

G02B 1514

Patent

active

045926263

ABSTRACT:
A compact zoom lens system is disclosed having a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power, such that the second and third lens groups are moved for the purpose of zooming, and the first lens group is moved in order to compensate for the movement of image surface, the entire system having a large zoom ratio.

REFERENCES:
patent: 3884555 (1975-05-01), Suwa et al.
patent: 4299454 (1981-11-01), Betensky
patent: 4306776 (1981-12-01), Someya
patent: 4380376 (1983-04-01), Suda et al.

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