Electricity: electrical systems and devices – Electrostatic capacitors – Variable
Patent
1989-08-23
1990-06-12
Griffin, Donald A.
Electricity: electrical systems and devices
Electrostatic capacitors
Variable
84688, G10H 102, H01G 700
Patent
active
049338072
ABSTRACT:
A capacitive pressure-sensitive and displacement-sensitive sensor apparatus and method in which first electrode means comprising a thin resilient conductive inclined or arcuate plastic sheet having a plurality of resilient projections protruding from the inner surface of the sheet and with said projections pressure-deformable by application of pressure thereat from the outer surface of the sheet cooperates with a second relatively flat electrode facing and coextensive with the projections and separated from the same by a thin dielectric layer therebetween, the first electrode extending inclinedly or arcuately over the second electrode such that when force is applied to the resilient first electrode along said outer surface thereof, as by a portion of means such as a keyboard key contacting the same, it approaches the second electrode and dielectric layer through air in a fashion which causes the resilient deformable projections along the inclined or arcuate inner surface thereof to contact said dielectric layer sequentially in a predictable order.
REFERENCES:
patent: 4498365 (1985-02-01), Tripp et al.
Griffin Donald A.
Key Concepts, Inc.
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