Device for controlling a circuit

Details Device for controlling a circuit Device for controlling a circuit

1981-11-20

1984-04-03

Trafton, David L.

Communications: electrical

Audible indication

Percussion-type sound producer

178 18, 200 5A, 338 47, 338 99, 340711, G08C 900

Patent

active

044410972

ABSTRACT:
A pressure sensing mat utilizes a thin sheet of semiconductor material that has an electrical conductivity generally invariable as to pressure applied to the mat material. The sheet of semiconductor material is sandwiched between sheets of copper, steel or aluminum foil which are in mechanical contact with the semiconductor sheet to define a pair of electrodes. The electrodes are connected to various circuits including a pressure (voltage) threshold detector, a learning circuit for establishing a learned threshold, a circuit for matching time-pressure patterns and a circuit for detecting pressures between a predetermined maximum and minimum level. A matrix of pressure sensing mats is utilized with various circuits to detect sequential pressure patterns.

REFERENCES:
patent: 2951817 (1960-09-01), Myers
patent: 2962274 (1960-11-01), Thurston
patent: 3125739 (1964-03-01), Deibel et al.
patent: 3437973 (1969-04-01), Mabbett
patent: 3629774 (1971-12-01), Crites
patent: 3643753 (1972-02-01), Godwin et al.
patent: 3777828 (1973-12-01), Dietemeyer
patent: 3789167 (1974-01-01), Seeger et al.
patent: 3894183 (1975-07-01), Barish
patent: 4003487 (1977-01-01), Downing
patent: 4017697 (1977-04-01), Larson

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