US PATENT SUBCLASS 250 / 201.4
.~.~.~ Active autofocus

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}
201.4.~.~.~ Active autofocus {1}
201.5  DF  .~.~.~.~> With optical storage medium; e.g., optical disc, etc.

DEFINITION

Classification: 250/201.4

Active autofocus:

(under subclass 201.2) Subject matter having means to illuminate the object with light other than, or supplementary to, ambient light.

(1) Note. Optical elements or systems of optical elements, e.g., reflectors, used to concentrate or otherwise intensify ambient illumination are encompassed by active autofocus illumination means.

SEE OR SEARCH CLASS

396, Photography,

106+, for automatic camera focussing using active ranging, for related subject matter when the camera structure is claimed as well as active focussing means.