US PATENT SUBCLASS 250 / 231.16
.~.~.~.~.~.~ Using phase difference of output signals from plural photodetectors

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}
231.1  DF  .~.~.~ Actuated by dynamic external physical quantity {4}
231.13  DF  .~.~.~.~ Shaft angle transducers {1}
231.14  DF  .~.~.~.~.~ Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation {4}
231.16.~.~.~.~.~.~ Using phase difference of output signals from plural photodetectors

DEFINITION

Classification: 250/231.16

Using phase difference of output signals from plural photodetectors:

(under subclass 231.14) Subject matter in which a signal proportional to the phase sum of, or difference between, outputs of the photodetectors is generated and is representative of the angular position or speed of the rotating shaft.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

6, for similar subject matter combined with digital data processing circuitry.