Digitizer pad featuring spacial definition of a pressure contact area
US4963702A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1989 |
| Grant date | Oct 16, 1990 |
| Priority date | — |
| Expiry date | Feb 9, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/045
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A digitizer pad apparatus includes at least one digitizer ply where each digitizer ply has a first and a second resistor strip, each with a resistance gradient along its length, oriented in spaced apart relationship. A plurality of conductor traces are interconnected along the length of each resistor strip to extend toward and be interleaved between each other to define a sensor pad region. Each sensor pad region defines a dimensional direction. A shunt ply is positioned to face the sensor pad region in normally non-conducting relationship so that when a selected area is pressed into contact with the conductor traces, conduction between adjacent conductor traces via the shunt ply will occur in the selected contact area. The selected contact area has a first edge and a second edge opposite the first edge along the defined dimensional direction. A voltage source is coupled across the first resistor strip and a switch is coupled across the ends of the second resistor strip for alternately coupling one end and then the other end of the second resistor strip to a utilization. The voltage and hence the location of the first edge and then the second edge of the contact area along the dime…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.