US PATENT SUBCLASS 178 / 18.09
.~.~.~ Optical


Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
18.01  DF  .~ Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) {4}
18.03  DF  .~.~ Writing digitizer pad {6}
18.09.~.~.~ Optical


DEFINITION

Classification: 178/18.09

Optical:

(under subclass 18.03) Subject matter wherein position coordinates are determined by a property (e. g., type, material, temperature, and structure of connection) of a photocell (e.g., photodiode or phototransistor) that is included in the sensing surface.

SEE OR SEARCH THIS CLASS, SUBCLASS:

19.05, for a light pen used as a writing digitizer stylus.

119, for receivers that convert received telegraph signals into a perceptible form using optical devices.

SEE OR SEARCH CLASS

341, Coded Data Generation or Conversion,

13+, for a digital pattern reading-type converter using optical device and subclass 31 for a bodily actuated code generator including a keyboard or keypad with an electric light sensor.

345, Computer Graphics Processing, Operator Interface Processing, and Selective Visual Display Systems, 175, for a combination of a display device and a writing digitizer pad with optical detection for position coordinate determination.