Piezoelectric polymer keyboard apparatus

Details Piezoelectric polymer keyboard apparatus Piezoelectric polymer keyboard apparatus

1985-05-29

1986-12-30

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310363, 340365A, H01L 4108

Patent

active

046331239

ABSTRACT:
An embodiment of a non-contact electrical keyboard switch which completely resists EMI and eliminates cross-talk comprises a pair of electrically insulating substrates having rows and columns of openings therethrough. A poled piezoelectric PVDF film is adhered to each substrate over the openings. The films have silk-screened ground electrodes deposited on one surface and signal generating key electrodes deposited on the other surface in registration with the openings. Leads connecting individual rows of key electrodes on one film and individual columns of key electrodes on other film are disposed orthogonally. An insulating sheet separates the films which have their key electrode surfaces facing each other. Leads are connected to ground and/or suitable electrical connectors to provide the keyboard switch. Processes are disclosed for fabricating embodiments of the keyboard switch.

REFERENCES:
patent: 3935485 (1976-01-01), Yoshida et al.
patent: 3940637 (1976-02-01), Ohigushi et al.
patent: 4071785 (1978-01-01), Yoshida et al.
patent: 4234813 (1980-11-01), Iguchi et al.
patent: 4328441 (1982-05-01), Kroeger
patent: 4516112 (1985-05-01), Chen

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