Browse Prior Art Database

Pointing Device

IP.com Disclosure Number: IPCOM000112618D
Original Publication Date: 1994-Jun-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Tucker, TG: AUTHOR

Abstract

Disclosed is the use of a small disk, having a capability to sense the location at which manual pressure is applied, to provide a pointing function in a computer system. The disk, which is, for example, 1.5 inches in diameter, is used to steer the pointer on a display screen, in the general manner of a computer mouse.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Pointing Device

      Disclosed is the use of a small disk, having a capability to
sense the location at which manual pressure is applied, to provide a
pointing function in a computer system.  The disk, which is, for
example, 1.5 inches in diameter, is used to steer the pointer on a
display screen, in the general manner of a computer mouse.

      The system operates according to the polar coordinates of the
location at which the disk is pressed, with the origin of the
coordinate system at the center of the disk.  The radial distance
from the center determines the speed at which the pointer moves on
the display screen.  As this distance is increased, the speed of the
display pointer is increased.  The angle of the point at which
pressure is applied, within the coordinate system, determines the
direction in which the pointer is moved on the display screen.  Thus,
if the disk is pressed at an upper left position, the display pointer
is moved upward and to the left.  The center of the disk provides a
dead zone relative to display pointer movement.  If the center of the
disk is depressed, the pointer does not move.  However, an object on
the display screen indicated by the display pointer is selected in
this way.  That is, pressing the center of the disk provides the
function of a mouse button.

      The disk may be located on the keyboard in an area where it is
natural to have fingers at rest.  For instance, it may be located on
an extended keyboard in t...