US PATENT SUBCLASS 396 / 256
.~.~ Stepping motor

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

213  DF  EXPOSURE CONTROL CIRCUIT {23}
246  DF  .~ Shutter speed function only {6}
256.~.~ Stepping motor

DEFINITION

Classification: 396/256

Stepping motor:

(under subclass 246) Subject matter in which the exposure control circuit drives a stepping motor for driving the shutter mechanism.

(1) Note. A stepping motor is an electromechanical device which rotates by a fixed amount each time it is pulsed.

SEE OR SEARCH THIS CLASS, SUBCLASS:

244, for stepping motor under program mode of an exposure control circuit.

260, for stepping motor driving a diaphragm mechanism.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure, 49, for structure of stepping motor.

318, Electricity: Motive Power Systems,

685, for stepping motors in a closed-loop servo environment.