Touch sensitive tablet using force detection

Details Touch sensitive tablet using force detection Touch sensitive tablet using force detection

1980-08-11

1983-06-21

Krass, Errol A.

Boots, shoes, and leggings

73 1B, 7386238, 178 18, 364508, 364731, G08C 2100

Patent

active

043897118

ABSTRACT:
A tablet comprising conversion means to convert component forces at three fulcra of an external force applied to one point on a faceplate into electric signals, sensing means to sense that no external force is applied, memory means to store the output signals of the conversion means at the respective fulcra as offset values at, at least, one point of time in the period in which no external force is applied, control means to control so as to execute writing into the memory means upon receiving an output of the sensing means, subtraction means to subtract outputs of the memory means from the outputs of the conversion means at the respective fulcra, and calculation means to execute calculations for evaluating coordinates of the point to which the external force has been applied, from outputs of the subtraction means in accordance with the output of the sensing means.

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patent: 3616690 (1971-11-01), Harden
patent: 3657475 (1972-04-01), Peronneau et al.
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patent: 3875331 (1975-04-01), Hasenbalg
patent: 4051721 (1977-10-01), Williams
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patent: 4293734 (1981-10-01), Pepper, Jr.
Lisk, "Electronic Keyboard"; IBM Tech. Discl. Bull.; vol. 20, No. 1; Jun. 1977; p. 259.
Fajans, "Acoustical Touch Panel"; IBM Tech. Discl. Bull.; vol. 20, No. 7; Dec. 1977; p. 2925.

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