US PATENT SUBCLASS 250 / 201.1
.~ Photocell controls its own optical systems

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
201.1.~ Photocell controls its own optical systems {8}
201.2  DF  .~.~> Automatic focus control {5}
201.9  DF  .~.~> Light beam wavefront phase adaptation
203.1  DF  .~.~> Following a target (e.g., a star or instrument pointer or other object) other than a pattern {2}
202  DF  .~.~> Following a pattern (e.g., line or edge)
548  DF  .~.~> Controlling web, strand, strip, or sheet
549  DF  .~.~> Cathode-ray tube
204  DF  .~.~> Adjusting optical system to balance brightness in plural paths
205  DF  .~.~> Controlling light source intensity

DEFINITION

Classification: 250/201.1

Photocell controls its own optical systems:

(under subclass 200) Subject matter in which the photocell automatically controls the illumination which falls on the photocell by altering optical means located between a source of illumination and the photocell or by altering the illumination source.

(1) Note. The control of the illumination may be achieved by altering the source of light (e.g., intensity or position) or by altering the optical path between source of light and photocell (e.g., transparency of light transmitting medium or position of photocell or optics).

SEE OR SEARCH THIS CLASS, SUBCLASS:

205, for photocell controlled circuits for controlling light source intensity.

206.1+, for photocell controlled circuits or devices which do not control the illumination of the photocell.

216+, for optical systems which control the illumination of a photocell.