EP0441567A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Pressure sensitive device
Assignee: EMI Group Ltd
•
Filing: 1991-02-04
•
Granted: —
•
Expires: 2011-02-04
Abstract
Abstract A pressure sensitive device may be used in the characterisation of written signatures and includes X- and a Y-coordinate piezoelectric layers (11,5) overlying which are, respectively, X- and Y- coordinate electrode structures (13,3). As pressure from a stylus is applied to the coordinate electrode structures (13,3) the piezoelectric layers (11,5) generate signals indicative of the coordinate position of the stylus on the device. The device further includes a pressure pad active device (29) for providing data indicative of the pressure applied to the device by the stylus. <IMAGE> <IMAGE>
Inventors
- 👤 Elvin Leonard Nix
- 👤 Alastair Sibbald
- 👤 Brian Holcroft
- 👤 Brian Jackson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 03:36
CPC Classifications
G; G07; G07C; G07C9/00; G07C9/30; G07C9/32; G07C9/35; G06; G06V; G06V40/00; G06V40/30; H; H10; H10N; H10N30/00; H10N30/30; H10N30/302
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
A pressure sensitive device comprising: a piezoelectric member; at least one coordinate electrode structure carried on the member, each electrode structure comprising an array of strips; a common electrode structure carried by the member; and data collection means comprising a plurality of busbars providing electrical connections to selected ones of the strips such that the coordinates of a point pressure applied on the device may be determined by piezoelectrical signals derived from the busbars.
Claim 2
Dependent Claim
45 words
A device according to claim 1 comprising first and second coordinate electrode structures, the strips within each of the coordinate electrode structures being parallel, the strips of the first and the strips of the second coordinate electrode structures extending in different directions over the member.
Claim 3
Dependent Claim
35 words
A device according to claim 1 or 2 wherein the busbars are connected to the selected strips via a selection of resistive members for providing binary-weighted signals for determining the coordinates of the point pressure.
Claim 4
Independent Claim
30 words
A device according to any one of the preceding claims wherein the piezoelectric member comprises two superimposed piezoelectric layers, each carrying one of the first and second coordinate electrode structures.
Claim 5
Independent Claim
20 words
A device according to any one of claims 1 to 3 wherein the piezoelectric member comprises a single piezoelectric layer.
Claim 6
Independent Claim
26 words
A device according to any one of the preceding claims further including determining means for determining the magnitude of the point pressure from the piezoelectric signals.
Claim 7
Dependent Claim
26 words
A device according to claim 6 wherein the determining means for determining the magnitude of the point pressure from the piezoelectric signals comprises a pressure pad.
Claim 8
Independent Claim
42 words
A device according to any one of the preceding claims including a further piezoelectric member, with a third electrode structure carried by the further member, the further member being arranged to produce piezoelectric signals representative of the magnitude of the point pressure.
Claim 9
Dependent Claim
31 words
A pressure sensitive device according to any one of the preceding claims further comprising a buffer store for storing piezoelectrical signals derived from the busbars for transmission via a communication system.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.