Optical system

Details Optical system Optical system

1976-07-09

1978-03-14

Sacher, Paul A.

G02B 1514

Patent

active

040788571

ABSTRACT:
A zoom lens system having slidable lens elements wherein in a first, zoom mode a first mechanical control means is provided for moving the slidable lens elements in accordance with a first law wherein the images of different magnifications of objects lying beyond a predetermined distance from the zoom lens may be focussed in the image plane, and a second macro mode wherein mechanical means are provided for moving the movable lens elements in accordance with a second law such that images of different magnification of an object nearer to the zoom lens than the first predetermined distance may be focused in the image plane. The first and second control means, in one embodiment, are arranged and formed on a common carrier structure. Control means are provided for enabling the focal length to be varied at any of two or more macro regions or planes.

REFERENCES:
patent: 3391973 (1968-07-01), Laurent
patent: 3613544 (1971-10-01), Perhal
patent: 3655271 (1972-04-01), Suzuki
patent: 3773402 (1973-11-01), Gela
patent: 3851952 (1974-12-01), Werz et al.
patent: 3884555 (1975-05-01), Seuva et al.
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 3970368 (1976-07-01), Belvard

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