Touch and pressure sensing method and apparatus
US6002389A · kind A · utility
473Cited by
24References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 23, 1997 |
| Grant date | Dec 14, 1999 |
| Priority date | — |
| Expiry date | Sep 23, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/0447
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The present invention provides a touch pad which can detect a simply stylus using a change capacitance. The touch pad is made flexible, so that the stylus pressure compresses an insulating layer between a conductive reference layer and matrix of conductive traces. The compression causes a change in capacitance due to either the two capacitive conductive surfaces being closer to each other, or a variation of the dielectric value of the insulating layer due to the replacement of air in air gaps by the material of the insulating layer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.