Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1993-08-16

1996-01-30

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359700, 359695, 359701, 359704, G03B 700

Patent

active

054885132

ABSTRACT:
A zoom lens barrel is provided including a cam ring which is threadedly engaged to a female helicoid formed in a stationary barrel, a linear movement guide member that is rotatable relative to the cam ring and movable in an optical axis direction together with the cam ring, and movable lens groups, including first, second and third lens groups that are guided in the optical axis direction by the linear movement guide member. The zoom lens barrel further includes a female helicoid formed on an inner peripheral surface of the cam ring to engage with a male helicoid of a first lens frame which holds the first lens group and a plurality of cam grooves formed on the cam ring to drive lens groups behind the first lens group.

REFERENCES:
patent: 3951522 (1976-04-01), Hashimoto
patent: 4993815 (1991-02-01), Yamzaki
patent: 5037187 (1991-08-01), Oda
patent: 5144493 (1992-09-01), Nomura
patent: 5164757 (1992-11-01), Nomura
patent: 5231449 (1993-07-01), Nomura
patent: 5270868 (1993-12-01), Nomura

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