Browse Prior Art Database

Enlarged Cursor Key With Trackball

IP.com Disclosure Number: IPCOM000119710D
Original Publication Date: 1991-Feb-01
Included in the Prior Art Database: 2005-Apr-02
Document File: 3 page(s) / 91K

Publishing Venue

IBM

Related People

Alo, RK: AUTHOR [+6]

Abstract

This article describes a terminal key which has a built-in trackball for versatile input, specifically, the vertical cursor key.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Enlarged Cursor Key With Trackball

      This article describes a terminal key which has a
built-in trackball for versatile input, specifically, the vertical
cursor key.

      The enlarged vertical cursor keyboard key [I] disclosed herein
contains a small trackball, providing two-dimensional control of a
cursor or other pointer in a personal computer (PC).  This allows the
user to have free movement of the cursor, in addition to the standard
vertical and horizontal directional movement.

      Referring to the drawings, Fig. 1 is a top view of a keyboard.
Fig. 2 is a sectional view along line A-A of Fig. 1.  Fig. 3 is
a perspective detail view of the key and trackball.  In Fig. 1
keyboard 1 is shown with enlarged cursor key 4 in place.  Trackball 3
is shown protruding from the top of the key (Fig. 2) so that it does
not interfere with normal function.  This trackball/cursor key acts
similar to a shift key which can lock in the lowered position.  The
dashed line 5 (Fig. 3) indicates the location of the top of the
trackball 3 in the assembled state.  The trackball 3 is a smooth
sphere which can be easily rotated with fingers.  The bottom
two-thirds of the trackball are encapsulated in a spherical bushing 7
that is a part of the key housing.  This provides easy rotation.  An
X-axis roller 8 and a Y-axis roller 9 rest against the sides of the
trackball 3.  The rollers 8 and 9 have a frictional surface that
rotates against the trackball 3 surface.  A Y-axis light-emitting
diode/photo transistor (LED/PTX) 10 and an X-axis LED/PTX 11 are us...