Capacitive touch-activated transducer system including a plurali

Details Capacitive touch-activated transducer system including a plurali Capacitive touch-activated transducer system including a plurali

1976-11-26

1978-07-25

Grimm, Siegfried H.

Oscillators

Plural oscillators

Adjustable frequency

200 52R, 200DIG1, 307116, 331 55, 331 56, 331 65, 331108D, 331111, 340365R, 361280, 340562, Q01D 2104, H01G 700, H03K 372

Patent

active

041032527

ABSTRACT:
A human touch on an etched copper electrode produces a capacitive change to vary the time constant of an RC network as a part of an oscillator. The variation in the capacitance of the sensor changes the time constant of the RC network which results in a change in frequency of the output signal of the oscillator. This change in frequency thus varies with the human touch to the copper electrode. To develop a directional indication of the touch position, four electrodes are arranged in opposed pairs along orthogonal axes. Each electrode is part of an RC network connected to an oscillator with each of the four oscillators identified with one of the four positions along the orthogonal axes. The output signal from each of the oscillators is transmitted to timing and control circuitry that generates four separate pulse trains, one pulse train identified with each of four positions along the orthogonal axis.

REFERENCES:
patent: 2219497 (1940-10-01), Stevens et al.
patent: 2546307 (1951-03-01), Johnson et al.
patent: 3497617 (1970-02-01), Ellis
patent: 3582827 (1971-06-01), Bjerede
patent: 3737670 (1973-06-01), Larson
patent: 3751612 (1973-08-01), Hansen
patent: 3773989 (1973-11-01), Hacon
patent: 4001807 (1977-01-01), Dallimonti

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