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Strain Gauge for Touch-Screen Sensing

IP.com Disclosure Number: IPCOM000106753D
Original Publication Date: 1993-Dec-01
Included in the Prior Art Database: 2005-Mar-21
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

McDonald, MG: AUTHOR [+3]

Abstract

Disclosed is a strain gauge pattern for sensing the depression of a touch sensitive screen. The flexible member to which the strain gauge is mounted is clamped at one end, being free to deflect as a cantilever beam from the application of a force at the other end. The deflection of the member is measured through the use of four conductive land patterns, with two patterns which are closer to the clamped end having lands extending primarily longitudinally, while the other two patterns have lands extending primarily transversely.

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Strain Gauge for Touch-Screen Sensing

      Disclosed is a strain gauge pattern for sensing the depression
of a touch sensitive screen.  The flexible member to which the strain
gauge is mounted is clamped at one end, being free to deflect as a
cantilever beam from the application of a force at the other end.
The deflection of the member is measured through the use of four
conductive land patterns, with two patterns which are closer to the
clamped end having lands extending primarily longitudinally, while
the other two patterns have lands extending primarily transversely.

Fig. 1 is an elevational view of the strain gauge, while Fig.  2 is a
circuit diagram showing the connection of the resistances formed by
the land patterns.

Referring to Fig. 1, a strain gauge 10 is mounted to a flexible
member clamped at an edge 12.  Strain gauge 10 deflects with the
flexible member in the fashion of a cantilever beam under the effects
of a force applied at an end opposite clamped edge 12.

Strain gauge 10 includes four resistances formed by conductive land
patterns.  Two of these patterns are longitudinal patterns 14, in
which the conductive land extends primarily longitudinally, while the
remaining two patterns are transverse patterns 16, in which the
conductive land extends primarily transversely.  Longitudinal
patterns 14 are mounted closer to clamped end.  Electrical
connections to the strain gauge are made at four solder pads 18,
which are located outwardly away from pattern...