Compact zoom lens system capable of high zoom ratio and having c

Details Compact zoom lens system capable of high zoom ratio and having c Compact zoom lens system capable of high zoom ratio and having c

1988-12-29

1990-04-17

Dzierzynski, P. M.

350428, G02B 1500

Patent

active

049174827

ABSTRACT:
A compact zoom lens system is capable of high zoom ratio and has coverage of a wide visual field. The system consists, in order from the object side, of a first lens group haivng a positive focal length, a second lens group having a negative focal length and a third lens group having a positive focal length, and effects zooming from the wide-angle end to the telephoto end by moving either all of the three lens groups or the first and third lens groups, with the image plane held at a constant position, the third lens group is composed of a lens unit 3a having a positive focal length and a lens unit 3b having a negative focal length, and the two lens units 3a and 3b are moved independently of each other in such a way that the distance between the lens units 3a and 3b is increased to satisfy condition (1) when zooming is effected from the wide-angle end to the middle focal length.

REFERENCES:
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4696553 (1987-09-01), Tsuji et al.
patent: 4749265 (1988-06-01), Hattori et al.

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