Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1991-11-18

1996-11-19

Nguyen, Thong Q.

Optical: systems and elements

Lens

With variable magnification

359694, 359700, G02B 1514

Patent

active

055768938

ABSTRACT:
A zoom lens barrel is provided in which the amount of forward movement made by a focus lens is altered in accordance with a change in a focal length caused by a zooming operation. The zoom lens barrel includes a moving mechanism for rotating a cam member around an optical axis and for moving this cam member in the direction of the optical axis in response to the zooming operation; a first cam for moving a zoom lens in the direction of the optical axis on the basis of the rotation around the optical axis and the movement in the direction of the optical axis; and a second cam for moving the focus lens, which focus lens is used for zooming and focusing, in the direction of the optical axis. The first and second cams are provided for the cam member.

REFERENCES:
patent: 4534625 (1985-08-01), Ohnuki
patent: 4729644 (1988-03-01), Ueyama
patent: 4840470 (1989-06-01), Ohtake
patent: 4993815 (1991-02-01), Yamazaki et al.
patent: 5018843 (1991-05-01), Inadome et al.
patent: 5144490 (1992-09-01), Yamanouchi
patent: 5144493 (1992-09-01), Nomura

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