US PATENT SUBCLASS 250 / 232
.~.~.~ Light chopper type

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

200  DF  PHOTOCELLS; CIRCUITS AND APPARATUS {11}
216  DF  .~ Optical or pre-photocell system {11}
229  DF  .~.~ Light valve (e.g., iris diaphragm) {3}
232.~.~.~ Light chopper type {1}
233  DF  .~.~.~.~> Rotary

DEFINITION

Classification: 250/232

(under subclass 229) Subject matter having means for intermittently interrupting the optical path between the light source and photocell in a repetitious cyclic sequence.

(1) Note. A camera shutter is generally not a light chopper, of the type found in this class, since it opens and closes in a nonrepetitious, noncyclic manner.