US PATENT SUBCLASS 250 / 231.13
.~.~.~.~ Shaft angle transducers

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.~.~.~.~ Shaft angle transducers {1}
231.14  DF  .~.~.~.~.~> Incremental shaft readers; i.e., with means to generate increments of angular shaft rotation {4}

DEFINITION

Classification: 250/231.13

Shaft angle transducers:

(under subclass 231.1) Subject matter wherein the angular position or speed or a rotatable shaft is the active external physical quantity sensed by one or more photocells and an output is generated which is indicative of those parameters.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

1+, for related subject matter further specifying the coded data generation or conversion circuitry, especially subclasses 13+ and 31 for optical type code converters, including keyboard actuation.