Telegraphy – Systems – Position coordinate determination for writing
Patent
1987-12-02
1989-03-21
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, 367907, G08C 2100
Patent
active
048145521
ABSTRACT:
This invention is an input device, or stylus, for entering hand drawn forms into a computer comprising a writing instrument, a pressure switch for determining whether the instrument is in contact with the writing surface, an acoustic transmitter for triangulating the position of the stylus on the surface, and a wireless transmitter for transmitting data and timing information to the computer. In operation, the stylus transmits an infra red signal which the system receives immediately, and an ultra sound pulse which two microphones receive after a delay which is a function of the speed of sound and the distance of the stylus from each microphone. From this information the system can calculate the position of the stylus. Switches for indicating functions are mounted on the stylus. Multiple stylusses can be used, each transmitting a distinctive identification code so that the system can determine which stylus is the signal source.
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L. G. Roberts, The Lincoln Wand, 1966, Fall Joint Computer Conference, pp. 223-227.
A. Bremmer & P. D. Bruyne, A Sonic Pen: A Digital Stylus System, Jun. 1970, IEEE Transactions, pp. 546-548.
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Heater J. Courtenay
Stefik Mark J.
Cunha Robert E.
Schreyer Stafford D.
Xerox Corporation
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