Stable wireless pointing device for a tablet
US5844548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 24, 1997 |
| Grant date | Dec 1, 1998 |
| Priority date | — |
| Expiry date | Jun 24, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/03545
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system for determining a position of a wireless pointing device relative to the plane of a conductor grid, by inducing currents in the conductor grid, includes a pointing device and a digitizer tablet on which is situated the conductor grid. The pointing device includes an oscillator, a resonator circuit, and a coil to which a tuned alternating current is supplied, and which emits an alternating signal that induces currents in the conductor grid. The power supply of the pointing device includes a DC-DC converter circuit for enabling the power supply to operate with only one low voltage battery, and a voltage stabilizer for preventing drift in the frequency and phase of the signal emitted by the pointing device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.