US PATENT SUBCLASS 396 / 257
.~ Diaphragm function only


Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

213  DF  EXPOSURE CONTROL CIRCUIT {23}
257.~ Diaphragm function only {4}
258  DF  .~.~> Pawl/ratchet type
259  DF  .~.~> Servo motor type {1}
261  DF  .~.~> Piezoelectric driven
262  DF  .~.~> Electro-optical element


DEFINITION

Classification: 396/257

Diaphragm function only:

(under subclass 213) Subject matter wherein the exposure control circuit determines an aperture value to control a diaphragm mechanism only.

(1) Note. Manual control circuit for both Av and Tv is classified in subclass 213.

SEE OR SEARCH THIS CLASS, SUBCLASS:

170, for diaphragm function control in exposure control circuit with illumination mode.

505+, for a camera diaphragm, per se.

, FOR 746+, for foreign art collections involving camera automatic exposure control having circuit for controlling diaphragm only.