Browse Prior Art Database

Automatic Switching Stylus for Pen-Based Computer Systems

IP.com Disclosure Number: IPCOM000106830D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 58K

Publishing Venue

IBM

Related People

Davis, JC: AUTHOR [+4]

Abstract

Described is a hardware implementation to provide a switching stylus mechanism for pen-based computer systems that automatically enables the user to switch between 'touch mode' and 'pen mode' of operation.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 61% of the total text.

Automatic Switching Stylus for Pen-Based Computer Systems

      Described is a hardware implementation to provide a switching
stylus mechanism for pen-based computer systems that automatically
enables the user to switch between 'touch mode' and 'pen mode' of
operation.

      In prior art, pen-based computer systems, sometimes called
"tablet" style computers, utilized an external manually operated
switch when a user required a change of mode between 'touch mode' and
'pen mode'.  Typically, a stylus is used while in 'pen mode' and the
users finger is used while in 'touch mode'.  While in 'touch mode',
the computer screen, or operator panel, acts as a capacitor that
discharges when a path to ground is provided, typically through the
users finger.  The touch panel recognizes the x-y coordinates of the
area being discharged and accepts this as input.  When in 'pen mode',
the panel must be immune to the users touch and must respond only to
the stimulus provided by the pen, or stylus.  In this case, the panel
acts as a receiver to the signals provided by the stylus.  The prior
art implementation usually utilized a user operated mechanical
switching arrangement to enable the 'touch mode' to 'pen mode'
change.

      The concept described herein eliminates the mechanical operator
induced switching approach by providing an automatic switching device
incorporated in the stylus.  Fig. 1 shows the stylus positioned in
relation to the tablet when not in use.  Metal c...