Precision variable resistor
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United States of America Patent
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Jun 18, 2013
Grant Date -
May 10, 2012
app pub date -
Feb 17, 2009
filing date -
Aug 27, 2008
priority date (Note) -
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Abstract
On the track of a potentiometer a resistive path of thin film is deposited or a foil is bonded to a matched substrate and a parallel path is formed of discrete contact straps extending from the resistive path. The resistive path has a protecting coating and the wiper is moving on abrasion resistant contact straps. This design enables application of high precision and stability resistor technologies in the production of variable resistors destined for long service life. It enables also, in high precision applications, by maintaining the linearity of the output versus input function, a two-wire connection to the variable resistor used as a position sensor.
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