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

Claim 2

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.

Claim 3

A data processing architecture for a pen-based computing system, having a real time erase feature, comprising: a stylus device which includes a first end having a first pressure sensing transducer and a first X-Y position sensing transducer for writing data and having a second end which includes a second X-Y position sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer, said first X-Y position sensing transducer connected to said multiplexer and said second X-Y position sensing transducer connected to said multiplexer; a transmitter in said stylus for transmitting a multiplexed data stream of information coming from said first pressure transducer and said first X-Y position transducer and representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information coming from said second pressure transducer and said second X-Y position transducer and representing the position of said stylus for erasing data; said system further comprising a digitizing display which includes an electrostatic tablet which radiates electromagnetic radiation which is detected by said first X-Y position sensor in said stylus when said stylus is oriented with its writing end proximate to said tablet; said electromagnetic radiation radiating from said electrostatic tablet being detected by said second X-Y position sensor in said stylus when said stylus is oriented with its erasing end proximate to said tablet; a receiver coupled to said electrostatic tablet and coupled to said pen-based computer system, for receiving said multiplexed data stream transmitted from said stylus; and calibration means in said pen-based system, for using first end calibration data derived from an event of contacting said first pressure transducer on the surface of said electrostatic tablet and establishing an X-Y sensing position of said first X-Y transducer with respect to said tablet, to calibrate said second end for erasing data, by combining said first end calibration data with an X-Y sensing position of said second X-Y transducer with respect to said tablet.

Claim 4

A data processing architecture for a pen-based computing system, having a real time erase feature, comprising: a stylus device which includes a first end having a first pressure sensing transducer and a first X-Y position sensing transducer for writing data and having a second end which includes a second X-Y position sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer, said first X-Y position sensing transducer connected to said multiplexer and said second X-Y position sensing transducer connected to said multiplexer; a transmitter in said stylus for transmitting a multiplexed data stream of information coming from said first pressure transducer and said first X-Y position transducer and representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information coming from said second pressure transducer and said second X-Y position transducer and representing the position of said stylus for erasing data; said system further comprising a digitizing display which includes an electrostatic tablet which radiates electromagnetic radiation which is detected by said first X-Y position sensor in said stylus when said stylus is oriented with its writing end proximate to said tablet; said electromagnetic radiation radiating from said electrostatic tablet being detected by said second X-Y position sensor in said stylus when said stylus is oriented with its erasing end proximate to said tablet; a receiver coupled to said electrostatic tablet and coupled to said pen-based computer system, for receiving said multiplexed data stream transmitted from said stylus; and calibration means in said pen-based system, for using first end calibration data derived from an event of contacting said first pressure transducer on the surface of said electrostatic tablet and establishing an X-Y sensing position of said first X-Y transducer with respect to said tablet, to calibrate said second end for erasing data, by combining said first end calibration data with an X-Y sensing position of said second X-Y transducer with respect to said tablet.

Claim 5

The system of claim 2 where said first X-Y position sensing transducer is used to generate a measurement compensation table which is used by said second X-Y position sensing transducer to correct measurements generated therefrom.

Claim 6

A data processing architecture for a pen-based computing system, having a real time erase feature, comprising: a stylus device which includes a first end having a first pressure sensing transducer and a first X-Y position sensing transducer for writing data and having a second end which includes a second pressure sensing transducer and a second X-Y position sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer and said first X-Y position sensing transducer also connected to said multiplexer; said second pressure sensing transducer coupled to said multiplexer and said second X-Y position sensing transducer also connected to said multiplexer; a transmitter in said stylus for transmitting a multiplexed data stream of information coming from said first pressure transducer and said first X-Y position transducer and representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information coming from said second pressure transducer and said second X-Y position transducer and representing the position of said stylus for erasing data; said system further comprising a digitizing display which includes an electrostatic tablet which radiates electromagnetic radiation which is detected by said first X-Y position sensor in said stylus when said stylus is oriented with its writing end proximate to said tablet; said electromagnetic radiation radiating from said electrostatic tablet being detected by said second X-Y position sensor in said stylus when said stylus is oriented with its erasing end proximate to said tablet; a receiver coupled to said electrostatic tablet and coupled to said pen-based computer system, for receiving said multiplexed data stream transmitted from said stylus; whereby an event of contacting said first pressure transducer on the surface of said electrostatic tablet and establishing an X-Y position of said first X-Y transducer with respect to said tablet, are transmitted from said stylus, through said receiver, to said pen-based computer system for writing data thereto and an event of contacting said second pressure transducer on the surface of said electrostatic tablet and establishing an X-Y position of said second X-Y transducer with respect to said tablet are transmitted from said stylus, through said receiver to said pen-based computer system for erasing data in said pen-based computer system.

Claim 7

A data processing architecture for a pen-based computing system, having a real time erase feature, comprising: a stylus device which includes a first end having a first pressure sensing transducer and a first X-Y position sensing transducer for writing data and having a second end which includes a second pressure sensing transducer and a second X-Y position sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer and said first X-Y position sensing transducer also connected to said multiplexer; said second pressure sensing transducer coupled to said multiplexer and said second X-Y position sensing transducer also connected to said multiplexer; a transmitter in said stylus for transmitting a multiplexed data stream of information coming from said first pressure transducer and said first X-Y position transducer and representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information coming from said second pressure transducer and said second X-Y position transducer and representing the position of said stylus for erasing data; said system further comprising a digitizing display which includes an electrostatic tablet which radiates electromagnetic radiation which is detected by said first X-Y position sensor in said stylus when said stylus is oriented with its writing end proximate to said tablet; said electromagnetic radiation radiating from said electrostatic tablet being detected by said second X-Y position sensor in said stylus when said stylus is oriented with its erasing end proximate to said tablet; a receiver coupled to said electrostatic tablet and coupled to said pen-based computer system, for receiving said multiplexed data stream transmitted from said stylus; whereby an event of contacting said first pressure transducer on the surface of said electrostatic tablet and establishing an X-Y position of said first X-Y transducer with respect to said tablet, are transmitted from said stylus, through said receiver, to said pen-based computer system for writing data thereto and an event of contacting said second pressure transducer on the surface of said electrostatic tablet and establishing an X-Y position of said second X-Y transducer with respect to said tablet are transmitted from said stylus, through said receiver to said pen-based computer system for erasing data in said pen-based computer system.

Claim 8

The system of claim 4 where said first X-Y position sensing transducer is used to generate a measurement compensation table which is used by said second X-Y position sensing transducer to correct measurements generated therefrom.

Claim 9

The system of claim 4 which further comprises said second pressure sensing transducer providing variable pressure sensing signals in response to varying detected pressures, for producing variable quantities of erasure of data in said pen-based computer system.