Title: Proximity switch circuit

Abstract: An input terminal is quiescently biased to a voltage closer to the initial threshold setting of a first comparator than to that of a second comparator. In response to the proximity of an object, an alternating voltage is induced on this terminal of an amplitude to actuate only the first comparator. Each time a comparator is actuated, a two state circuit changes the threshold settings of the comparators to bring the one formerly outside of the range of the alternating voltage to within its range and vice versa.

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Inventors: Sheng, Abel Ching Nam (Morris Plains, NJ, US)

Application Number: 490010
Filing Date: 1974-07-19
Publication_date: 1976-02-03
Assignee: RCA Corporation (New York, NY)
Primary Class(es): 307/652 327/73
Other Classes:
US Patent Ref:

3255380	Jun, 1966	Atkins et al.	328/5.
3564346	Feb, 1971	Atkins	307/308.
3731205	May, 1973	Gardner	328/5.
3757143	Sep, 1973	Muller	307/308.

Other Refs:
Primary Examiner: Hayman, John S.
Assistant Examiner:
Attorney: Christoffersen; H., Cohen; S., Coalter; R. G.