US PATENT SUBCLASS 250 / 201.8
.~.~.~ Based on image shift

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  DF  .~.~ Automatic focus control {5}
201.8.~.~.~ Based on image shift

DEFINITION

Classification: 250/201.8

Based on image shift:

(under subclass 201.2) Subject matter in which the focusing is based on coincidence of two images of the same object moved in the same plane or of the displacement or distance between different images of the same object in the same plane, e.g., the photodetector plane.