Focusing mechanism

Details Focusing mechanism Focusing mechanism

1984-05-01

1987-01-06

Corbin, John K.

3542341, G02B 704

Patent

active

046342214

ABSTRACT:
In a camera or other photographic apparatus employing a movable lens, motion imparting means, such as a cam, has respective positions corresponding to infinity, close-up, and intermediate focus positions of the lens. The motion imparting means is rotatable uni-directionally about the optical axis of the lens from one of its corresponding positions successively to the other corresponding positions and back to the first position, for moving the lens bi-directionally along such axis between the infinity and close-up positions. Electromagnetically operated indexing means, such as a pawl and ratchet, is actuatable about the optical axis to rotate the motion imparting means in one direction only. The electromagnetic actuator for the indexing means is movable in opposite directions about the optical axis in accordance with the direction of current flow to the actuator, to actuate the indexing means and to reset itself. The resulting focusing mechanism is a relatively compact, simple unit.

REFERENCES:
patent: 4396267 (1983-08-01), Hirohata et al.
patent: 4504132 (1985-03-01), Martin et al.

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