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 including a radiative pickup stylus for a digitizing display, having a write tip on one end and an erase tip on the opposite end, where the write tip includes a mechanical touch down sensing mechanism and a first radiative pickup means which receives radiative signals from said digitizing display, and said erase tip includes a second radiative pickup means, a method for calibrating said erase tip, comprising the steps of: measuring a first radiative pickup signal strength from said first radiative pickup means in said write end, while mechanically contacting said digitizing display; measuring a second radiative pickup signal strength from said second radiative pickup means in said erase end; adjusting a radiative detection means coupled to said second radiative pickup means 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 (20) which includes a first end (4) having a first pressure sensing transducer and a first X-Y sensing transducer for writing data and having a second end (4') which includes a second X-Y sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer (36), said first X-Y position sensing transducer connected to said multiplexer and said second X-Y position position sensing transducer connected to said multiplexer; a transmitter (46) in said stylus having an input connected to said multiplexer for transmitting a multiplexed data stream of information representing contact pressure applied to said first pressure transducer and first X-Y position transducer, for information representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information representing said X-Y position transducer, for information representing the position of said stylus for erasing data; said system further comprising a digitizing display which includes an electrostatic tablet (54) 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 (66) 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 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 position of said second X-Y transducer with respect to said tablet.

Claim 4

The system of claim 3 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 5

A data processing architecture for a pen-based computing system, having a real time erase feature, comprising: a stylus device (20) which includes a first end having a first pressure sensing transducer and a first X-Y sensing transducer for writing data and having a second end which includes a second pressure sensing transducer and a second X-Y sensing transducer for erasing data; said first pressure sensing transducer coupled to a multiplexer (36) 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 position sensing transducer also connected to said multiplexer; a transmitter (46) in said stylus having an input connected to said multiplexer for transmitting a multiplexed data stream of information representing contact pressure applied to said first pressure transducer and first X-Y position transducer, for information representing the position of the stylus for writing data; said transmitter further transmitting a multiplexed data stream of information representing contact pressure applied to said second pressure transducer and said second X-Y position transducer, for information 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 (66) 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 6

The system of claim 5 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 7

The system of claim 5 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.

Claim 8

In a data processing system including a radiative pickup stylus for a digitizing display, having a write tip on one end and an erase tip on the opposite end, where the write tip includes a mechanical touch down sensing mechanism and a first radiative pickup antenna which receives radiative signals from said digitizing display, and said erase tip includes a second radiative pickup antenna, a method for erasing data with said erase tip, comprising the steps of: measuring a first radiative pickup signal strength from said first antenna in said write end, while mechanically contacting said digitizing display; measuring a second radiative pickup signal strength from said second antenna in said erase end; computing in said data processing system, an adjustment value for 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; and measuring a third radiative pickup signal strength from said second antenna and adjusting said third signal strength using said adjustment value, for providing a data erasing signal.