Position pointing device having resonant circuit with sequentially changed characteristics and combination thereof with position detecting device
US5661269A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 17, 1995 |
| Grant date | Aug 26, 1997 |
| Priority date | — |
| Expiry date | Mar 17, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A position pointing device for use with a digitizing tablet sequentially transmits plural different kinds of non-positional information to the tablet. The position pointing device varies a resonance characteristic of a resonance circuit in accordance with plural kinds of amount information, during each of plural sequential time slots. A tablet detects a resonance characteristic of the resonance circuit. The frequency and/or amplitude of the AC field coupled from the resonance circuit to the tablet are varied. The frequency variation is sufficiently small that it can be detected with a synchronous detector driven by a single frequency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.