Browse Prior Art Database

Touch CRT Cover Isolation

IP.com Disclosure Number: IPCOM000108085D
Original Publication Date: 1992-Apr-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 2 page(s) / 53K

Publishing Venue

IBM

Related People

Brew, TP: AUTHOR [+4]

Abstract

A design which mounts a touch-sensitive CRT assembly to a monitor bezel (front cover) using centrally fitted energy-absorbing isolation mountings is described. Abuse of the CRT cover by the user and mechanical distortion effects are overcome.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 98% of the total text.

Touch CRT Cover Isolation

       A design which mounts a touch-sensitive CRT assembly to a
monitor bezel (front cover) using centrally fitted energy-absorbing
isolation mountings is described.  Abuse of the CRT cover by the user
and mechanical distortion effects are overcome.

      When a touch-sensitive CRT assembly 1 with corner mounted and
fixed strain gauges 3 experiences an external force applied to the
monitor covers 2 during normal operation, a positional error of the
cursor is seen on the CRT screen 5.  The cause of the error is due
to the strain gauge frame 1 being distorted by the monitor cover 2,
transmitting the movement directly to the strain gauges 3 which are
mounted to the covers in the corners (see the figure).

      A centrally mounted and energy isolation arrangement disclosed
below reduces the error in two ways:
A.   The strain gauge frame 1 is a very strong component and is
mounted to the front cover 2 centrally but the corners 3 where the
strain gauges are fixed are floating clear of the covers 2, so when
an external force is applied to the covers the transmission of force
path to the strain gauges is longer and the effect on positional
error of the cursor greatly reduced.
B.   The eight isolating energy-absorbing flanged bushes 4 at top,
bottom and sides reduce the magnitude of the external forces and
hence transmit a much smaller force to each gauge.

      When both the above factors are incorporated together, the
cover abus...