Adjusting mechanism for movable picture-taking objective

Details Adjusting mechanism for movable picture-taking objective Adjusting mechanism for movable picture-taking objective

1976-03-19

1978-08-15

Gonzales, John

Photocopying

Contact printing

Light boxes

355 58, 355 71, G03B 300, G03B 1302

Patent

active

041077148

ABSTRACT:
A photographic or cinematographic objective, bodily displaceable between an object plane and an image plane, has a lens mount slidably supported on a base which may be inclined at an acute angle to the generally horizontal optical axis. Two setting rings, one for adjusting the magnification ratio and the other for controlling a diaphragm, are mechanically connected by a spring-loaded linkage with a pair of cam-follower rollers bearing upon respective edges of two camming strips secured to the base whereby the two rings are counterrotated upon a movement of the objective mount in either direction. The roller-engaging strip edges advantageously are so oriented, in the case of a sloping base, as to oppose the spring force upon a downward movement of the lens mount so as to exert a braking action.

REFERENCES:
patent: 3314350 (1967-04-01), Husum
patent: 3549250 (1970-12-01), Pantenburg
patent: 3778152 (1973-12-01), Raymond
patent: 3883244 (1975-05-01), Whitaker

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