(under subclass 259) Subject matter in which the exposure control circuit drives a stepping motor for driving the diaphragm to obtain a specific aperture size.
(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.
256, for stepping motor driving a shutter mechanism.
, FOR 752, for a foreign art collection involving camera automatic exposure control having servo motor-type circuit
which uses a stepping motor for controlling diaphragm only.
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, in general.
