Zoom lens with extended variable focal length range

Details Zoom lens with extended variable focal length range Zoom lens with extended variable focal length range

1979-06-18

1981-03-17

Clark, Conrad J.

350429, G02B 1516

Patent

active

042563712

ABSTRACT:
In the disclosed zoom lens a front lens group serves for focusing, a variator group and a compensator group for zooming and a fixed lens group for forming an image. In the basic focal length range the front lens group is fixed while the variator group and the front lens group are movable. In order to increase or decrease the focal length beyond the basic focal length range, the front lens group, the variator group and the compensator group are moved simultaneously. From the wide angle limit or from the telephoto limit of the basic focal length range through the extended range at both ends the front lens group and the variator group are moved simultaneously.

REFERENCES:
patent: 3840290 (1974-10-01), Betensky
patent: 3972591 (1976-08-01), Suwa
patent: 3992083 (1976-11-01), Tanaka
patent: 4015895 (1977-04-01), Hirose
patent: 4080047 (1978-03-01), Uesugi

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