(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.
