Zoom lens system

Details Zoom lens system Zoom lens system

1993-08-26

1994-08-09

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359695, 359687, 35419512, G02B 1514

Patent

active

053371879

ABSTRACT:
In a zoom lens system having a plurality of lens units including a focusing lens unit movable during zooming and having the zooming and focusing functions, when a predetermined movement locus for zooming is expressed with the angle of rotation of a rotatable lens barrel for prescribing the amount of movement of the lens units in the direction of the optical axis thereof as a variable, the movement locus of the focusing lens unit is formed by the combination of a focus cam and a zoom compensation cam, and the movement locus of the movable non-focusing lens units which are not concerned in focusing is formed by the combination of the zoom compensation cam and a zoom cam corresponding to each non-focusing lens unit.

REFERENCES:
patent: 4627691 (1986-12-01), Tomori
patent: 4763999 (1988-08-01), Lawther
patent: 4848884 (1989-07-01), Enomoto
patent: 4925282 (1990-05-01), Kanno et al.
patent: 4993815 (1991-02-01), Yamazaki
patent: 5000551 (1991-03-01), Shibayama
patent: 5032013 (1991-07-01), Shibayama

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