US PATENT SUBCLASS 396 / 261-- .~.~ Piezoelectric driven

US PATENT SUBCLASS 396 / 261
.~.~ Piezoelectric driven

Current as of: June, 1999
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396 /	HD	PHOTOGRAPHY

213	DF	EXPOSURE CONTROL CIRCUIT {23}
257	DF	.~ Diaphragm function only {4}
261		.~.~ Piezoelectric driven

DEFINITION

Classification: 396/261

Piezoelectric driven:

(under subclass 257) Subject matter wherein the exposure control means drives the diaphragm mechanism using a piezoelectric device.

(1) Note. A piezoelectric device produces a voltage when stressed, or undergoes mechanical stress when subjected to a voltage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

248, for shutter driven by piezoelectric device.

, FOR 753, for a foreign art collection involving camera automatic exposure control having special driving arrangement for controlling diaphragm only.

SEE OR SEARCH CLASS

310, Electrical Generator or Motor Structure,

311+, for a piezoelectric device, per se.