US PATENT SUBCLASS 250 / 201.2
.~.~ Automatic focus control

Current as of: June, 1999
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250 /   HD   RADIANT ENERGY

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
201.1  DF  .~ Photocell controls its own optical systems {8}
201.2.~.~ Automatic focus control {5}
201.3  DF  .~.~.~> Of a microscope
201.4  DF  .~.~.~> Active autofocus {1}
201.6  DF  .~.~.~> Based on triangulation
201.7  DF  .~.~.~> Based on contrast
201.8  DF  .~.~.~> Based on image shift

DEFINITION

Classification: 250/201.2

Automatic focus control:

(under subclass 201.1) Subject matter in which at least one photocell is used to automatically adjust a lens to form a distinct image of an object on an imaging surface.

SEE OR SEARCH CLASS

396, Photography,

89+, for automatic camera focussing having photoelectric control.