Position detecting apparatus with coils of opposite loop directi

Details Position detecting apparatus with coils of opposite loop directi Position detecting apparatus with coils of opposite loop directi

1993-08-19

1995-07-18

Chin, Stephen

Telegraphy

Systems

Position coordinate determination for writing

G08C 2100

Patent

active

054343720

ABSTRACT:
A position detecting apparatus includes a tablet and a position pointer. The tablet includes a plurality of electromagnetic wave generating/detecting apparatus. The generating/detecting apparatus generates an electromagnetic wave at specified points of time and detects electromagnetic wave at different points of time. The electromagnetic wave generating/detecting apparatus includes a first coil of a first direction with a first inductance value and a second coil of a second direction with a second inductance value. The first and second coils are coupled serially and closely adjacent to each other and the first inductance value is substantially equal to the second inductance value. Only the first coil is enabled when the electromagnetic wave generating/detecting apparatus is generating the electromagnetic wave, the first and second coils are both enabled when the electromagnetic wave generating/detecting apparatus is receiving the electromagnetic wave. Any interference sensed both by the first and second coils are offset and therefore a position detecting apparatus with high immunity from the electromagnetic interference is provided.

REFERENCES:
patent: 4734546 (1988-03-01), Landmeier
patent: 4878553 (1989-11-01), Yamanami et al.
patent: 4999461 (1991-03-01), Murakami et al.
patent: 5051545 (1991-09-01), McDermott
patent: 5276282 (1994-01-01), Russell

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