Telegraphy – Systems – Position coordinate determination for writing
Patent
1994-10-25
1997-11-25
Kuntz, Curtis
Telegraphy
Systems
Position coordinate determination for writing
G08C 2160
Patent
active
056915110
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 one another; and a loop coil selecting unit for selecting, from among the loop coils, a predetermined loop coil as a position detecting element, and a loop coil adjacent to the predetermined loop coil as an error compensating element.
REFERENCES:
patent: 4795858 (1989-01-01), Yamazaki
patent: 4902858 (1990-02-01), Yamanami et al.
patent: 5051545 (1991-09-01), McDesmott
patent: 5120907 (1992-06-01), Shinisori et al.
patent: 5313024 (1994-05-01), Morton
patent: 5414226 (1995-05-01), Matsushima
Hirano Shuuji
Matsushima Keiichi
Graphtec Corporation
Kuntz Curtis
Loomis Paul
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