Optical apparatus having a motor control device

Details Optical apparatus having a motor control device Optical apparatus having a motor control device

1994-02-10

1996-11-05

Gellner, Michael L.

Photography

With exposure objective focusing means, focusing aid, or...

Lens drive circuit or motor structure

396 86, G03B 118, G03B 300

Patent

active

055722709

ABSTRACT:
An optical apparatus having a movable member movable with a stepping motor as a drive source, and movement controller for moving the movable member to a set position. The movement controller step-drives the stepping motor in one direction by a first frequency so that the movable member may bear against a stopper member, and after the bearing of the movable member against the stopper member is discriminated, step-drives the stepping motor by a predetermined amount in the other direction by a second frequency, which is smaller than the first frequency, and the position of the movable member in that state is defined as the set position.

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patent: 5187513 (1993-02-01), Imanari et al.
patent: 5264888 (1993-11-01), Inoue et al.
patent: 5311230 (1994-05-01), Ogawa

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