Telegraphy – Systems – Position coordinate determination for writing
Patent
1991-11-26
1993-08-24
Schreyer, Stafford
Telegraphy
Systems
Position coordinate determination for writing
367 90, 367907, G08C 2100, G01F 166
Patent
active
052391396
ABSTRACT:
An ultrasonic digitizer pen includes an ultrasonic transmitter to transmit ultrasonic waves through the air, to illuminate a writing surface. An ultrasonic receiver receives the waves reflected off the illuminated writing surface. The writing surface is a mouse pad, a wooden tabletop or other surface having a natural amount of roughness to reflect ultrasonic waves in all directions.
The transmitter and receiver are located in the pen near its tip and have radiation patterns pointing generally in the same direction, and parallel to the writing surface. At least one of the radiation patterns is narrow in a horizontal plane and wide in a vertical plane, to illuminate a narrow area of the writing surface.
phase measuring circuit measures the phase difference between the transmitted and the received ultrasonic signals. This phase is indicative of the displacement of the digitizer pen.
Two pairs of ultrasonic transmitter-receiver are used to measure a two-dimensional movement; three pairs of transmitter-receiver are used to measure movement in three dimensions.
REFERENCES:
patent: 4905206 (1990-02-01), Nishiyama et al.
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