Focusing means for photographic apparatus

Details Focusing means for photographic apparatus Focusing means for photographic apparatus

1977-12-01

1979-10-23

Gonzales, John

354195, G03B 300

Patent

active

041718950

ABSTRACT:
A photographic apparatus wherein the objective is movable by a focusing mechanism in response to manual rotation of a ring from a starting position. A spring biases the ring to the starting position through the medium of a follower which carries a blocking lever for the focusing mechanism. The blocking lever is moved from the path of a reciprocable spring-biased toothed rack of the focusing mechanism prior to unlocking of the rack by a lever which is disengaged from the rack during that stage of movement of the ring from its starting position which follows retraction of the blocking lever from the path of the rack. The focusing mechanism has a certain amount of inertia so that it does not change the position of the objective during movement of the photographic apparatus between different positions in which the objective is or may be trained upon objects located at different distances from the apparatus.

REFERENCES:
patent: 3713371 (1973-01-01), Kurihara et al.
patent: 3947860 (1976-03-01), Imai et al.

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