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Architecture and method for communication of writing and erasing signals from a remote stylus to a digitizing display

  • US 5,475,401 A
  • Filed: 04/29/1993
  • Issued: 12/12/1995
  • Est. Priority Date: 04/29/1993
  • Status: Expired due to Fees
First Claim
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1. In a data processing system, a radiative pickup stylus for a digitizing display, comprising:

  • a write tip on one end of the stylus and an erase tip on the opposite end;

    said write tip including a mechanical touch down sensing mechanism and a first radiative antenna mechanism which receives radiative signals from said digitizing display and providing a first set of input signal to a multiplexer;

    said erase tip including a second radiative antenna mechanism and providing a second set of input signal to the multiplexer;

    a transmitter in said stylus having an input connected to said multiplexer for transmitting a multiplexed data stream of information representing the position of the stylus for writing data;

    said transmitter further transmitting a multiplexed data stream of information representing the position of said stylus for erasing data; and

    means for calibrating said erase tip, coupled to said write tip and said erase tip, by measuring a first radiative pickup signal strength in said first set of input signals from said first antenna in said write end while mechanically contacting said digitizing display, measuring a second radiative pickup signal strength in said second set of input signals from said second antenna in said erase end, and adjusting a radiative detection means coupled to said second antenna in said erase end, in response to said first and said second radiative pickup signal strengths.

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