Title: Detection means for multiple capacitive sensing devices

Abstract: A detection circuit for detecting discrete states of multiple capacitive sensing devices in a continuum provides an output which is linearly variable with respect to changes in the states of the sensing devices. The circuit uses either a time interval measurement or voltage measurement which has a magnitude which linearly corresponds to changes in the states of the sensing devices. By continuously monitoring these outputs, a continuous indication of discrete changes in the states of the sensing devices is detectable. In accordance with the present invention, a single drive electrode and a single sense electrode in combination with a plurality of sensing devices capacitively transmit electrical pulses in accordance with the various states of the sensing devices whereby the detection circuit detects discrete changes in a state of the sensing devices in a continuum.

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Inventors: Bristol, Robert G. (Everett, MA, US)

Application Number: 038520
Filing Date: 1979-05-14
Publication_date: 1981-05-05
Assignee: Emhart Industries, Inc. (Indianapolis, IN)
Primary Class(es): 307/116 73/304C, 307/143
Other Classes:
US Patent Ref:

3492440	Jan, 1970	Cerbone	200/DIG.
3935739	Feb, 1976	Ells	73/304.
4099167	Jul, 1978	Pomerantz	340/620.
4177421	Dec, 1979	Thornburg	200/DIG.

Other Refs:
Primary Examiner: Hix, L. T.
Assistant Examiner: Schreyer, Stafford D.
Attorney: Meyer; Robert F., Gomes; David W.