Compact zoom lens system

Details Compact zoom lens system Compact zoom lens system

1982-11-17

1985-03-26

Corbin, John K.

350423, G02B 704

Patent

active

045069581

ABSTRACT:
A zoom lens system 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, the zoom lens system being arranged to be zoomed from the wide position to the teleposition by keeping the second lens group fixed in respect to the image surface and moving the first and third lens groups respectively toward the direction away from the image surface and arranged to be focused on an object at the infinite distance up to an object at a short distance by moving the first lens group only toward the direction away from the image surface, the zoom lens system having a large zoom ratio and being compact in size.

REFERENCES:
patent: 2908199 (1959-10-01), Kaprelian
patent: 4232942 (1980-11-01), Ikemori
patent: 4240700 (1980-12-01), Ogawa et al.
patent: 4299454 (1981-11-01), Betensky

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