Zoom lens barrel

Details Zoom lens barrel Zoom lens barrel

1981-03-23

1983-10-25

Corbin, John K.

350252, 350255, G02B 700, G02B 711

Patent

active

044114982

ABSTRACT:
A zoom lens barrel has on the outside of a fixed ring an operating ring rotatable about the optical axis and rectilinearly movable in the direction of the optical axis. The fixed ring has at least three grooves therein extending in a direction substantially coincident with the direction of the optical axis and formed substantially equidistantly in the circumferential direction of the fixed ring. The operating ring has in the inner periphery thereof a groove extending circumferentially of the operating ring. A cam ring provided inside of the operating ring has at least three grooves therein extending in a direction different from the grooves of the fixed ring and the operating ring and formed substantially equidistantly in the circumferential direction of the cam ring. A first lens frame member holding a magnification changing lens optical system and a second lens frame member holding a correction lens optical system are provided inside of the fixed ring. One of the first and second lens frame members has at least three projected members thereon. The other lens frame member is adapted to be moved in the direction of the optical axis in accordance with the rotation of the cam ring and to assume a movement different from that of the one lens frame member.

REFERENCES:
patent: 3765748 (1973-10-01), Mito
patent: 4124275 (1978-11-01), Uesugi
patent: 4315670 (1982-02-01), Shigoku

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