Touch sensing device

Details Touch sensing device Touch sensing device

1983-06-20

1985-12-03

Groody, James J.

Communications: electrical

Audible indication

Percussion-type sound producer

200DIG1, 340365S, G06F 302

Patent

active

045568715

ABSTRACT:
A transparent finger touch sensing device having a sensing circuit including a resonator for sensing a touch an oscillator for supplying an AC signal to the resonator, a buffer circuit for isolating an output of the oscillator from each selected touch electrodes and for supplying the oscillator output to the remaining non-selected touch electrodes when the sensing circuit is sequentially connected to the touch sensing electrodes, is disclosed. Thereby, the selected touch electrodes and non-selected touch electrodes are maintained at a voltage having the same phase and the same level and the inter-electrode impedance is substantially negligible.

REFERENCES:
patent: 3594781 (1971-07-01), Gerjets
patent: 4291303 (1981-09-01), Cutler
patent: 4405917 (1983-09-01), Chai
IEEE International Solid State Circuits Conference, Katz, Session XV, Feb. 17, 1978, pp. 202-203.

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