Zoom lens barrel with single operating ring

Details Zoom lens barrel with single operating ring Zoom lens barrel with single operating ring

1979-11-07

1982-02-16

Henry, Jon W.

G02B 1518, G02B 704

Patent

active

043156703

ABSTRACT:
A zoom lens barrel has incorporated therein an optical system including a first lens group which is moved both for focusing and for zooming by a single operating ring. A first lens moving frame for holding the first movable lens group is provided separately from the operating ring and is restrained from rotation by a focusing mechanism when the operating ring is turned. An attachment mounting portion is provided on the nonrotatable lens moving frame. The first lens group is moved for zooming free of any eccentricity relative to a second lens group. The attachment on the mounting portion is held stationary against rotation despite turning of the operating ring.

REFERENCES:
patent: 3914026 (1975-10-01), Kanno
patent: 3915557 (1975-10-01), Shimojima
patent: 4171880 (1979-10-01), Mori et al.

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