Electromagnetic pointer
US8692814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 7, 2010 |
| Grant date | Apr 8, 2014 |
| Priority date | — |
| Expiry date | Apr 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An electromagnetic pointer is disclosed. The electromagnetic pointer comprises a pen holder assembly, a circuit board, a metal rod, a ferrite core with coils and a trigger device. The diameter of the pen holder assembly is less than 6 mm. The circuit board comprises a resonance circuit. The metal rod has a low permeability. The ferrite core with coil constitutes an inductor and the coil electrically connects to the circuit board through a conductive wire to complete the resonance circuit. The ferrite core has a hollow center so that the metal rod can move through to trigger the trigger device and change electric properties of the resonance circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.