US PATENT SUBCLASS 396 / 127
.~.~ Inflection point type

Current as of: June, 1999
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396 /   HD   PHOTOGRAPHY

89  DF  WITH EXPOSURE OBJECTIVE FOCUSING MEANS, FOCUSING AID, OR RANGEFINDING MEANS {28}
125  DF  .~ Processing circuit {3}
127.~.~ Inflection point type

DEFINITION

Classification: 396/127

Inflection point type:

(under subclass 125) Subject matter wherein the processing circuit generates a signal and detects an in-focus condition when the signal is at a relative maximum or minimum magnitude (i.e., when the first derivative of the signal function becomes zero).

SEE OR SEARCH CLASS

327, Miscellaneous Active Electrical Nonlinear Devices, Circuits and Systems,

58+, for signal extrema discriminating, per se.