Adjusting mechanism for movable picture-taking objective
AssigneeJos. Schneider Optische Werke GmbH
InventorKarl-Heinz Raab
Life of this patent
Estimating the term…
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.
Claims9
In a picture-taking apparatus comprising an objective displaceable between a fixed first plane and a fixed second plane for projecting an image of an object in said first plane with a variable magnification ratio upon said second plane, said objective being provided with an adjustable diaphragm and with at least one movable component for varying the focal length of said objective, the combination thereof with:
- a base;
- mounting means supporting said objective on said base, said mounting means being movable in a direction generally parallel to the optical axis of said objective;
- a first setting member on said objective for adjusting said movable component;
- a second setting member on said objective for adjusting said diaphragm;
- first cam-follower means on said mounting means mechanically connected with said first setting member;
- first cam means on said base engaged by said first cam-follower means for imparting a predetermined adjusting motion to said first setting member upon displacement of said mounting means on said base;
- second cam-follower means mechanically connected with said second setting member;
- and
- second cam means on said base engaged by said second cam-follower means for imparting a predetermined adjusting motion to said second setting member upon displacement of said mounting means on said base.
Dependencies are inferred from the claim text.