US PATENT SUBCLASS 396 / 245
.~ Manual Av circuit with automatic Tv circuit, or vice versa


Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

213  DF  EXPOSURE CONTROL CIRCUIT {23}
245.~ Manual Av circuit with automatic Tv circuit, or vice versa


DEFINITION

Classification: 396/245

Manual Av circuit with automatic Tv circuit, or vice versa:

(under subclass 213) Subject matter including a manual aperture control circuit (Av circuit) responsive to a manually set aperture value with an automatic exposure time control circuit (Tv circuit) generating an exposure time calculated from the manually set aperture value and a detected scene brightness; or a manual Tv circuit responsive to a manually set exposure time value with an automatic Av circuit generating an aperture value calculated from the manually set exposure time value and a detected scene brightness.

(1) Note. Aperture value (Av) or exposure time value (Tv) is a logarithmic number indicative of the aperture size or the exposure time.

SEE OR SEARCH THIS CLASS, SUBCLASS:

, FOR 741+, for foreign art collections involving camera automatic exposure control having circuit for controlling separate diaphragm and shutter.