US PATENT SUBCLASS 250 / 230
.~.~.~ Reflection type(e.g., mirror galvanometer)

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}
230.~.~.~ Reflection type(e.g., mirror galvanometer)

DEFINITION

Classification: 250/230

(under subclass 229) Subject matter in which the optical path between light source and photoelectric cell includes a reflective element, and in which the amount of reflection or the direction of reflection is varied so as to vary the intensity of the photocell illumination.

(1) Note. Examples of such variable reflecting elements include mirrors which oscillate under the control of a physical quantity and compass cards which have variable reflective markings.