Optical zooming lens

Details Optical zooming lens Optical zooming lens

1974-06-03

1976-07-20

Corbin, John K.

350186, G02B 1500

Patent

active

039703681

ABSTRACT:
A lens system for a camera comprises a pair of axially shiftable components for varying the focal length, coupled with a cylindrical zoom-control member, and a further axially shiftable component for changing the object distance, coupled with a cylindrical focusing-control member. An operating tube coaxial with the two control members engages the zoom-control member for rotating same, the focusing-control member being releasably entrainable by the zoom-control member between a limiting macro-range position and a close-up position through a deactivable coupling which may include two coacting lugs on these members or a pawl on the zoom-control member retractable by an axial shift of the operating tube. A toothed detent ring, nonrotatable but axially slidable, is also movable by that tube into engagement with the focusing-control member for arresting same against the force of a biasing spring urging that member into its limiting macro-range position.

REFERENCES:
patent: 3163701 (1964-12-01), Staubach
patent: 3465662 (1969-09-01), Kashiwase
patent: 3613544 (1971-10-01), Plihal et al.
patent: 3731987 (1923-05-01), Iida et al.

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