Single-electrode capacitance touchpad sensor systems

Details Single-electrode capacitance touchpad sensor systems Single-electrode capacitance touchpad sensor systems

1978-10-19

1980-12-02

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307116, 307308, 340562, H03K 326, G08B 1326

Patent

active

042374219

ABSTRACT:
Each of an array of capacitive touchpad sensors has a single touchpad electrode fabricated upon a substrate and accessible to user personnel, with series coupling and shunt capacitance being provided respectively between a driving generator and the touchpad electrode, and the touchpad electrode and an array ground. Each capacitive touchpad sensor operates with a sense amplifier to provide a high density sensor array requiring relatively low driving voltage amplitudes and may be utilized with driven shields and a normalization network to provide reliable capacitance sensing with reduced sensitivity to contamination of the surface of the sensor array.

REFERENCES:
patent: 3846780 (1974-11-01), Gilcher
patent: 3846791 (1974-11-01), Foster
patent: 3893035 (1975-07-01), Higgens
patent: 4016490 (1977-04-01), Weckenmann et al.
patent: 4107555 (1978-08-01), Haas et al.
patent: 4136291 (1979-01-01), Waldron
IBM Tech. Disclre. Blttn., Toch-Sensing Circuit, J. A. Williams vol. 17, No. 1, 6/74 pp. 166 & 167.

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