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Position pointing device including a memory and a position detecting device coupled by AC fields to the pointing device

  • US 5,672,852 A
  • Filed: 03/17/1995
  • Issued: 09/30/1997
  • Est. Priority Date: 03/18/1994
  • Status: Expired due to Term
First Claim
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1. A position detecting device wherein a position pointing device emits an AC field having a certain spatial distribution which corresponds to the coordinate value of a position pointed by the position pointing device, a tablet detects the AC field to determine the coordinate value of the position pointed by said position pointing device, and said position pointing device controls the intensity characteristic, frequency characteristic, or the time-dependent changes of these characteristics of said AC field in accordance with predetermined individual information, and the tablet detects them to determine the predetermined individual information from said position pointing device:

  • said position pointing device comprising;

    a memory for storing predetermined individual information,an AC field receiver for receiving an AC field transmitted from the tablet and which contains predetermined individual information and a write instruction therefor or a read instruction for said predetermined individual information,an instruction extractor for extracting the predetermined individual information and the write instruction therefor or the read instruction for said predetermined individual information from said received AC field, andan information controller for writing the predetermined individual information to said memory in accordance with said extracted write instruction and for reading the predetermined individual information from said memory as said predetermined individual information in accordance with said extracted read instruction; and

    said tablet comprising;

    an instruction source for creating predetermined individual information and a write instruction therefor or a read instruction for reading said predetermined individual information,an AC field transmitter for transmitting to the position pointing device an AC field, which contains said predetermined individual information and the write instruction therefor or the read instruction for said predetermined individual information, andan information reproducer for reproducing the predetermined individual information from the intensity characteristic, frequency characteristic or time-dependent changes of these characteristics of the detected AC field.

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