Variable capacitor and position indicator employing variable capacitor
US5206785A · kind A · utility
74Cited by
8References
45Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 6, 1991 |
| Grant date | Apr 27, 1993 |
| Priority date | — |
| Expiry date | Aug 6, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A variable capacitor comprises a solid dielectric disc having one electrode disposed on one face thereof. A flexible electrode is selectively urged into contact with a second face of the disc, parallel to the first face. A translatable stem drives the second electrode into contact with the first surface. The variable capacitor is used in an implement which is moved relative to a position detecting tablet. The variable capacitor is part of a tuned circuit having a resonant frequency approximately the same as the frequency of AC energy applied to coils of the position detecting tablet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.