US PATENT SUBCLASS 250 / 204
.~.~ Adjusting optical system to balance brightness in plural paths

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}
204.~.~ Adjusting optical system to balance brightness in plural paths

DEFINITION

Classification: 250/204

(under subclass 201.1) Subject matter having two optical paths from a source or two sources of illumination to one or more photocells and having means for controlling one or more of the optical paths so that the ratio of light flux which traverses the different optical paths stays constant.

SEE OR SEARCH THIS CLASS, SUBCLASS:

208.1+, for similar subject matter having plural photocells in an electric circuit which does not control the illumination reaching the photocells.

578, for photocell illuminating systems having plural light paths to one or more photocells.