Zoom lens system for camera

Details Zoom lens system for camera Zoom lens system for camera

1980-11-18

1981-12-29

Griffin, Donald A.

350255, G02B 1500, G03B 300

Patent

active

043079512

ABSTRACT:
A zoom lens system for a camera comprises a focusable lens, a variator lens for making a focal length of the lens system variable and a compensator lens for compensating the displacement of its image point caused by the variator lens. A zoom operating sleeve is provided which is rotatable about an optical axis and formed on its inner surface with first and second cam surfaces according to which lens holders for the variator and compensator lenses are respectively controlled in relative movement with the aid of a spring for resiliently urging the lens holders against the cam surfaces.

REFERENCES:
patent: 2484464 (1949-10-01), Quigley et al.
patent: 3744884 (1973-07-01), Filipovich et al.
patent: 3931629 (1976-01-01), Himmelsbach
patent: 4002405 (1977-01-01), Stahl

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