Compact zoom lens system having three lens groups

Details Compact zoom lens system having three lens groups Compact zoom lens system having three lens groups

1982-12-02

1986-11-18

Corbin, John K.

350423, 350450, G02B 15163, G02B 1514

Patent

active

046232265

ABSTRACT:
A compact zoom lens system having excellent performance and comprising a first lens group having positive refractive power, a second lens group having negative refractive power and a third lens group having positive refractive power, said third lens group being fixed relative to the image plane, said second lens group being moved along the optical axis for varying magnification, and deviation of the image position caused by moving said second lens group is compensated by moving said first lens group.

REFERENCES:
patent: 3044356 (1962-07-01), Cox et al.
patent: 4256381 (1981-03-01), Kraitzer
patent: 4432615 (1984-02-01), Ikemori
patent: 4466708 (1984-08-01), Batansky
patent: 4478496 (1984-10-01), Kato

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