Position pointing device including a controller for an AC field

Details Position pointing device including a controller for an AC field Position pointing device including a controller for an AC field

1994-10-05

1997-10-21

Kuntz, Curtis

Telegraphy

Systems

Position coordinate determination for writing

178 18, 345179, 34082554, 3408703, 34087031, G08C 2100, G08C 1900, G08C 1906, G09G 302

Patent

active

056799306

ABSTRACT:
A position pointing device codes information corresponding to an operation expressed by a continuously variable parameter without using an A/D converter and transmits the coded information to a position detecting device. The information corresponding to the operation expressed by the continuously variable parameter is converted into a time length. A counter counts the number of waves of an AC field received by a receiving circuit within the time length determined by the converting circuit, and performs binary coding of the counted value. A control circuit controls an emitter circuit in accordance with the binary code to change an AC field which is sent back to the position detecting device.

REFERENCES:
patent: 3571510 (1971-03-01), Weir
patent: 4260852 (1981-04-01), Fencl
patent: 4710760 (1987-12-01), Kasday
patent: 5313024 (1994-05-01), Morita
patent: 5349139 (1994-09-01), Verrier et al.

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