Piezoelectric or pyroelectric polymer input element for use as a transducer in keyboards
AssigneeToray Industries, Inc.
InventorsHeishaburo Iguchi, Hiroji Ohigashi
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Abstract
An input element for use as a transducer in keyboards is disclosed, which utilizes a polymeric material having piezoelectric or pyroelectric property as a stimulus-receiving portion of the element. The element has a plurality of stimulus-receiving portions. One face of each of stimulus-receiving portions has mutually independent electrodes, of which one is for detecting signal and another is for earthing, and another face of each stimulus-receiving portions has mutually independent electrodes, of which one is for detecting signal and another is for earthing. The signal-detecting electrode on the one face is disposed corresponding to the earthing electrode on the another face.
Claims7
An input element for use as a transducer in keyboard comprising:
- a supporting plate,
- a plurality of stimulus-receiving portions provided on said supporting plate,
- a first signal-detecting electrode (A1) and a front-face earthing electrode (B1) provided mutually independently on the front face of each of said stimulus-receiving portions,
- a back-face earthing electrode (A2) and a second signal-detecting electrode (B2) provided mutually independently on the back face of each of said stimulus-receiving portions,
- said first signal-detecting electrode (A1) being disposed corresponding to said back-face earthing electrode (A2),
- said second signal-detecting electrode (B2) being disposed corresponding to said front-face earthing electrode (B1),
- a portion (CA) of each of said stimulus-receiving portions located between said first signal-detecting electrode (A1) and said back-face earthing electrode (A2) being formed from polymeric material having piezoelectric or pyroelectric property, and
- a portion (CB) of each of said stimulus-receiving portions located between said second signal-detecting electrode (B2) and said front-face earthing electrode (B1) being formed from polymeric material having piezoelectric or pyroelectric property.
Dependencies are inferred from the claim text.