Cordless digitizer
US5691511A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 25, 1994 |
| Grant date | Nov 25, 1997 |
| Priority date | — |
| Expiry date | Oct 25, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/046
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A cordless digitizer includes a tablet including position detecting elements formed of loop coils, error compensating elements formed of loop coils, and an auxiliary element formed of a coil which is arranged around a reading range of the tablet; and a position indicator including a position indicating element; and an error compensating unit which, when the position indicator is set at a position on the tablet, obtains first outputs according to interactions between the position detecting elements and the auxiliary element of the tablet and the position indicating element of the position indicator, and second outputs according to interactions between the error compensating elements, the auxiliary element of the tablet and the position indicating element of the position indicator to produce third outputs according to the first and second outputs from which error output components due to direct actions between the elements of the tablet have been eliminated; a position detecting loop coil assembly provided on the tablet which comprises loop coils arranged thereon at predetermined intervals in such a manner that adjacent loop coils are set close to one another but not overlapped with …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.