US4234813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Piezoelectric or pyroelectric polymer input element for use as a transducer in keyboards
Assignee: Toray Industries Inc
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Filing: 1979-04-10
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Granted: 1980-11-18
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Expires: 1999-04-10
Abstract
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.
Inventors
- 👤 Heishaburo Iguchi
- 👤 Hiroji Ohigashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:34
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/964; H03K17/9643; H03K17/965; H10; H10N; H10N15/00; H10N15/10; H10N30/00; H10N30/30; H10N30/302; Y; Y10; Y10S; Y10S310/00; Y10S310/80
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
165 words
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.
Claim 2
Dependent Claim
165 words
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.
Claim 3
Dependent Claim
24 words
The input element of claim 1 wherein a polarity of said portion (CA) and a polarity of said portion (CB) are the same polarity.
Claim 4
Dependent Claim
24 words
The input element of claim 1 wherein a polarity of said portion (CA) and a polarity of said portion (CB) are the reverse polarity.
Claim 5
Dependent Claim
20 words
The input element of claim 1 wherein said plurality of stimulus-receiving portions are provided on a same continuous polymeric film.
Claim 6
Dependent Claim
19 words
The input element of claim 4 wherein said continuous polymeric film has piezoelectric or pyroelectric property throughout the film.
Claim 7
Dependent Claim
21 words
The input element of claim 4 wherein said continuous polymeric film has piezoelectric or pyroelectric property only at said stimulus-receiving portions.
Claim 8
Dependent Claim
56 words
The input element according to claim 1 further comprising a plurality of lead wires (A) and plurality of lead wires (B), each of said lead wires (A) is connected to a plurality of said first signal-detecting elestrodes (A1) and each of said lead wires (B) is connected to a plurality of said second signal-detecting electrode (B2).
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-18 | 1984-05-19 | 1984-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-18 | 1988-05-19 | 1988-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-18 | 1992-05-19 | 1992-11-18 | $7700.00 | Window Closed / Lapsed |