US4755707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Input device
Assignee: Hitachi Ltd
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Filing: 1986-12-22
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Granted: 1988-07-05
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Expires: 2006-12-22
Abstract
Abstract An input device such as a keyboard or a tablet for input of pattern employing a piezoelectric material/polymer 1-3 composite of the structure in which a number of rods of piezoelectric material are buried in a polymer.
Inventors
- 👤 Chitose Nakaya
- 👤 Hiroshi Takeuchi
- 👤 Kageyoshi Katakura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:21
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/964; H03K17/9643; H10; H10N; H10N15/00; H10N15/10; H10N30/00; H10N30/30; H10N30/302; H10N30/80; H10N30/85; H10N30/852
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
An input device comprising: a piezoelectric material/polymer 1-3 composite which consists of a polymer and a number of rods of piezoelectric material buried in the polymer; a common electrode provided on one surface of said piezoelectric material/polymer 1-3 composite; and a plurality of signal detecting electrodes that are independently provided on the other surface of said piezoelectric material/polymer 1-3 composite, wherein said rods of piezoelectric material are not provided at places where no signal detecting electrode is provided.
Claim 2
Dependent Claim
78 words
An input device comprising: a piezoelectric material/polymer 1-3 composite which consists of a polymer and a number of rods of piezoelectric material buried in the polymer; a common electrode provided on one surface of said piezoelectric material/polymer 1-3 composite; and a plurality of signal detecting electrodes that are independently provided on the other surface of said piezoelectric material/polymer 1-3 composite, wherein said rods of piezoelectric material are not provided at places where no signal detecting electrode is provided.
Claim 3
Dependent Claim
24 words
An input device according to claim 1, wherein said input device further comprises a coating layer provided on a surface of said common electrode.
Claim 4
Dependent Claim
27 words
An input device according to claim 1, wherein said input device further comprises a printed circuit board on which said plurality of signal detecting electrodes are formed.
Claim 5
Dependent Claim
22 words
An input device according to claim 1, wherein said rods of piezoelectric material are located only vertically above the signal detecting electrodes.
Claim 6
Dependent Claim
22 words
An input device according to claim 1, wherein said rods of piezoelectric material exhibit pyroelectricity, whereby an infrared detector can be provided.
References Cited (Backward Citations)
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Cited
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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) | 1991-07-05 | 1992-01-04 | 1992-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-05 | 1996-01-04 | 1996-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-05 | 2000-01-04 | 2000-07-05 | $7700.00 | Window Closed / Lapsed |