Cam mechanism in zoom lens

Details Cam mechanism in zoom lens Cam mechanism in zoom lens

1989-05-31

1991-08-27

Brown, Brian W.

Optical: systems and elements

Prism

With reflecting surface

359700, 359701, G03B 118

Patent

active

050437526

ABSTRACT:
A cam mechanism in a zoom lens having a stationary barrel secured to a camera body, a cam ring rotatably fitted in the stationary barrel, a front lens group frame movable in the optical axis direction in the cam ring, a front lens group integrally supported by the front lens group frame, and a rear lens group supported in the cam ring so as to move in the optical axis direction. The cam ring is provided with front lens group cam grooves and rear lens group cam grooves, so that when the cam ring rotates, the front lens group and the rear lens group are moved in the optical axis direction. The number of the front lens group cam grooves is larger than that of the rear lens group cam grooves.

REFERENCES:
patent: 4324457 (1982-04-01), Tomori
patent: 4411498 (1983-10-01), Muryoi
patent: 4506959 (1985-03-01), Hama
patent: 4848884 (1989-07-01), Enomoto

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