US PATENT SUBCLASS 250 / 231.14
.~.~.~.~.~ Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation

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.~.~.~.~.~ Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation {4}
231.15  DF  .~.~.~.~.~.~> With plural gear driven discs
231.16  DF  .~.~.~.~.~.~> Using phase difference of output signals from plural photodetectors
231.17  DF  .~.~.~.~.~.~> With means to indicate a complete shaft rotation
231.18  DF  .~.~.~.~.~.~> Position indicating shaft encoders with means to generate a unique signal for each specific angular shaft position

DEFINITION

Classification: 250/231.14

Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation:

(under subclass 231.13) Subject matter wherein photocell means is provided to incrementally sense the angular position or speed of a rotatable shaft as the active external physical quantity and for generating an output proportional to the number of increments sensed by the photocell(s).

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

11, for similar subject matter combined with digital signal processing circuitry.