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Browse Prior Art Database

KEYBOARD ARRAY

IP.com Disclosure Number: IPCOM000023227D
Original Publication Date: 1977-Feb-28
Included in the Prior Art Database: 2004-Mar-29
Document File: 2 page(s) / 186K

Publishing Venue

Xerox Disclosure Journal

Abstract

A typewriter-like keyboard is suggested which utilizes the piezoelectric and/or the pyroelectric properties of poled polyvinylidene fluoride films (PVF2), Poled and aluminized PVF2 films are observed to generate a voltage when pressure is applied between the aluminum coating and the film.

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XEROX DISCLOSURE JOURNAL

KEYBOARD ARRZ~Y Proposed Classification
William M. Prest, Jr. U.S. Cl, 310/8.7
Gustav Pfister mt. Cl, HOly 7/00

A typewriter-like keyboard is suggested which utilizes the
piezoelectric and/or the pyroelectric properties of poled
polyvinylidene fluoride films (PVF

                            2), Poled and aluminized
PVF
2 films are observed to generate a voltage when pressure
is applied between the aluminum coating and the film.

A keyboard construction is suggested in which selected areas
of a PVF

     2 film are coated with aluminum. The coated areas
are connected to electrical output leads. The PVF

                                          2 film
having the coated areas thereon is sandwiched between a
rigid support and a flexible sheet. The flexible sheet has
indicia marked on it to match specific ones of the coated
areas.

When a specific indicia is pressed, for example by finger
pressure, a voltage is created in the corresponding alum-
inized area.~ The voltage is translated along the output
lead to which that particular aluminized area is connected
in order to cause a corresponding specific electromechanical
reaction, such as the movement of a typewriter key.

Volume 2 Number 1 January/February 1977 39

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