US PATENT SUBCLASS 250 / 206.3
.~.~.~.~ 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}
206  DF  .~ Photocell controlled circuit {9}
206.1  DF  .~.~ Having means to generate positional information in at least one plane of a target moving relative to one or more photodetectors {1}
206.2  DF  .~.~.~ Detection of positional information in two or more planes (e.g., azimuth and elevation; hour angle and declination) {1}
206.3.~.~.~.~ With moving reticle in optical path

DEFINITION

Classification: 250/206.3

With moving reticle in optical path:

(under subclass 206.2) Subject matter in which a moving, e.g., rotating or oscillating, apertured or patterned element is in the optical path between the target and photodetector(s) to modulate the light reaching the photodetector(s) from the target.

(1) Note. A reticle is often used (a) to chop the light reaching the photodetector(s) to permit 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 choppers to modify 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.