Zoom lens

Details Zoom lens Zoom lens

1990-10-25

1992-09-01

Dzierzynski, Paul M.

Optical: systems and elements

Lens

With variable magnification

359700, 359701, G02B 1500

Patent

active

051444909

ABSTRACT:
A zoom lens of the kind varying the focusing movement degree of a focusing-and-zooming lens according to the change of focal length caused by a power varying operation comprises a zooming cam member which rotates around an optical axis in response to zooming; a zoom cam formed in the zooming cam member; a first cam follower which engages the zoom cam; a zooming lens group which is movable in association with the movement of the first cam follower; a focusing cam member; a focus cam formed in the focusing cam member; a second cam follower which engages the focus cam; the focusing-and-zooming lens which is movable in association with the movement of the second cam follower; a focusing rotation member which rotates the second cam follower in response to a focusing action; and a moving mechanism which is arranged to vary the position of the focus cam by moving the focusing cam member in the optical axis direction in response to the rotation of the zooming cam member, in such a manner that a range of engagement of the second cam follower with the focus cam in the focusing action varies and the position of the second cam follower in the optical axis direction varies.

REFERENCES:
patent: 4534625 (1985-08-01), Ohnuki
patent: 4848884 (1989-07-01), Enomoto
patent: 4890132 (1989-12-01), Hama
patent: 4925282 (1990-05-01), Kanno et al.

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