Position detecting apparatus having a tablet and a position poin

Details Position detecting apparatus having a tablet and a position poin Position detecting apparatus having a tablet and a position poin

1996-09-10

1999-04-27

Shankar, Vijay

Telegraphy

Systems

Position coordinate determination for writing

178 1803, 178 1806, 178 1901, 178 1903, 345173, 345176, 345179, G08C 2100, G09G 500

Patent

active

058981365

ABSTRACT:
A position detecting apparatus includes a position point device and a tablet. The position pointing device has a simple configuration as well as an easy way of adjusting a resonance frequency, without requiring a wide range of frequencies for inputting information. The position pointing device has a resonance circuit and an amplitude control circuit that limits a signal level generated in the resonance circuit. The tablet transmits an electromagnetic wave with at least two kinds of energy per transmission, thereby identifying operation of the position pointing device based on a comparison of signal levels received by the tablet.

REFERENCES:
patent: 4878553 (1989-11-01), Yamanami
patent: 5028745 (1991-07-01), Yamanami et al.
patent: 5500492 (1996-03-01), Kobayashi
patent: 5629500 (1997-05-01), Fukuzaki
patent: 5706000 (1998-01-01), Fukuzaki

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