US PATENT SUBCLASS 396 / 257
.~ Diaphragm function only
Current as of:
June, 1999
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396 /
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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.
