EP0032013A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Writing pad for character recognition apparatus
Assignee: Moore Business Forms Inc
•
Filing: 1980-12-15
•
Granted: —
•
Expires: 2000-12-15
Abstract
Abstract Character recognition apparatus includes a writing pad having a pair of sheets (5a, 11a) normally electrically insulated from one another but are adapted to be brought into contact with one another by writing pressure by a writing implement upon the writing pad. The apparatus also has an electrical switching circuit (14) to cause current to flow through the pad along two alternate paths and has a recognition circuit (17) to recognise written characters by virtue of the changes in electrical voltage in the alternate paths. One of the sheets of the writing pad has a central part of high resistivity (5a) and has a border of low resistivity material (4) and being of such a resistivity that the voltage gradient along the length of the pad is linear and the other of the sheets (11a) comprises a layer of conductive material.
Inventors
- 👤 Lawrence Joseph Lukis
- 👤 Maurice Ezekiel
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 07:26
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/041; G06F3/045; G06V; G06V10/00; G06V10/10; G06V10/12; G06F2203/00; G06F2203/041; G06F2203/04113
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
129 words
Character recognition apparatus comprising a writing pad comprising a pair of sheets normally electrically insulated from one another but adapted to be brought into contact with one another by writing pressure by a writing implement upon the writing pad, an electrical switching circuit to cause current to flow through the pad along two alternate paths and a recognition circuit to recoganise written characters by virtue of the changes in electrical voltage in the alternate paths characterised in that one of the sheets of the writing pad comprises a central part of high resistivity and has a border of low resistivity material of such resistivity that the voltage gradient along the length of the pad is linear and the other one of the sheets comprises a layer of conductive material.
Claim 2
Dependent Claim
129 words
Character recognition apparatus comprising a writing pad comprising a pair of sheets normally electrically insulated from one another but adapted to be brought into contact with one another by writing pressure by a writing implement upon the writing pad, an electrical switching circuit to cause current to flow through the pad along two alternate paths and a recognition circuit to recoganise written characters by virtue of the changes in electrical voltage in the alternate paths characterised in that one of the sheets of the writing pad comprises a central part of high resistivity and has a border of low resistivity material of such resistivity that the voltage gradient along the length of the pad is linear and the other one of the sheets comprises a layer of conductive material.
Claim 3
Dependent Claim
59 words
A character recognition apparatus according to claim 1 characterised in that the one sheet of the writing pad has a plurality of connector areas in conducting relationship with the part of high resistivity which connector areas are connected through conductive connector layer to a connector at one edge of the writing pad for connecting to the electrical switching circuit.
Claim 4
Dependent Claim
41 words
A character recognition apparatus according to claim 1 or 2 characterised in that a plurality of areas of high resistivity material are produced around the central part of high resistivity selectively connected to the central part of high resistivity by connectors.
Claim 5
Dependent Claim
24 words
A character recognition apparatus according to claiml,2 or 3 wherein the sheets of the writing pad are retained apart by an intermediate spacing layer.
Claim 6
Dependent Claim
29 words
A character recognition apparatus according to claim 4 wherein the intermediate spacing layer comprises two leaf layers between which is provided a layer of dielectric non-conductive elastomeric gel material.
Claim 7
Dependent Claim
27 words
A character recognition apparatus according to claim 2 wherein the connector area comprises rectangular connector areas arranged adjacent each respective corner of the central high resistivity part.
Claim 8
Dependent Claim
28 words
A character recognition apparatus according to claim 6 wherein additional connector areas are 'provided at opposite of the central high resistivity part midway between the corner connector areas.
Claim 9
Dependent Claim
124 words
A writing pad comprising a pair of sheets normally electrically insulated from one another but adapted to be brought into contact with one another by writing pressure by a writing implement upon the writing pad, wherein one of the sheets comprises a central part of high resistivity, a plurality of connector areas of low electrical conductivity to connect its part of high resistivity to an external switching circuit characterised in that the part of high resistivity has a border of low resistivity with a plurality of areas of high resistivity around the border, the plurality of areas of high resistivity are selectively connected to the central part and being of such resistivity that the voltage gradients along the length of the pad is linear.
Claim 10
Dependent Claim
124 words
A writing pad comprising a pair of sheets normally electrically insulated from one another but adapted to be brought into contact with one another by writing pressure by a writing implement upon the writing pad, wherein one of the sheets comprises a central part of high resistivity, a plurality of connector areas of low electrical conductivity to connect its part of high resistivity to an external switching circuit characterised in that the part of high resistivity has a border of low resistivity with a plurality of areas of high resistivity around the border, the plurality of areas of high resistivity are selectively connected to the central part and being of such resistivity that the voltage gradients along the length of the pad is linear.
Claim 11
Dependent Claim
20 words
A character recognition apparatus constructed arranged and adapted to operate substancially as herein described with reference to the accompanying drawings.
Claim 12
Dependent Claim
20 words
A character recognition apparatus constructed arranged and adapted to operate substancially as herein described with reference to the accompanying drawings.
References Cited (Backward Citations)
US4178481A
Cited
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.