US PATENT SUBCLASS 250 / 203.7
.~.~.~.~ With moving reticle in optical path


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}
203.1  DF  .~.~ Following a target (e.g., a star or instrument pointer or other object) other than a pattern {2}
203.3  DF  .~.~.~ Self-luminous target {4}
203.7.~.~.~.~ With moving reticle in optical path


DEFINITION

Classification: 250/203.7

With moving reticle in optical path:

(under subclass 203.3) Subject matter in which a moving, e.g., oscillating or rotating, apertured or patterned element is in the optical path between the target and photocell to modulate the light reaching the photocell from the target.

(1) Note. A reticle is often used (a) to chop the light reaching the photodetector(s) to permit a-c amplification of the signal generated by the photodetector(s); (b) to aid in distinguishing the target from background illumination; and (c) to generate signals indicative of the position (e.g., azimuth and elevation) of a target.

SEE OR SEARCH THIS CLASS, SUBCLASS:

233, rotary light chopping light valves for reticles used to control light reaching a photocell.

SEE OR SEARCH CLASS

359, Optics: Systems (Including Communication) and Elements,

234+, for reticles which rotate in an optical path to control light.