Telegraphy – Systems – Position coordinate determination for writing
Patent
1985-07-24
1987-05-12
Schreyer, Stafford D.
Telegraphy
Systems
Position coordinate determination for writing
340706, G08C 2100
Patent
active
046652825
ABSTRACT:
A tablet type coordinate input apparatus comprises a flat medium for propagating a longitudinal elastic wave, longitudinal elastic wave detecting elements disposed on part of the end-adjacent side surfaces or of the front surface of the flat medium, a longitudinal elastic wave input member having an end portion terminating in a sharp-pointed end and brought into pressure engagement at that end with any desired position on the surface of the flat medium to radiate the longitudinal elastic wave from that end, an amplifier circuit amplifying electrical signals indicative of the elastic wave detected by the detecting elements, a comparator circuit comparing the signals amplified by the amplifier circuit with a predetermined threshold voltage thereby generating delay pulse signals corresponding to the propagation times of the longitudinal elastic wave, a counter circuit counting the lengths of time elapsed from the time of radiation of the longitudinal elastic wave toward the flat medium as a result of pressure engagement of the input member therewith to the time of generation of the delay pulse signals, and a computing circuit computing the coordinates on the basis of the time signals applied from the counter circuit.
REFERENCES:
patent: 3808364 (1974-04-01), Veith
patent: 3857022 (1974-12-01), Rebane et al.
A Sonic Pen: A Digital Stylus System, A. E. Brenner & P. de Bruyne, IEEE Transactions on Computers, Jun. 1970, pp. 546-548.
A Proposal For Input of Hand-Drawn Information to a Digital System, P. W. Woo, IEEE Transactions on Computers, Oct. 1964, pp. 609-611.
Graphic Sensor Using a Lamb Wave, Akira Ishii, S. Hashimoto, IEEE Ultrasonic Symposium, 1981, pp. 167-170.
Inose Shigeru
Kawakami Kanji
Okada Hisao
Sasaki Soji
Sato Ichiya
Hitachi , Ltd.
Schreyer Stafford D.
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