Resistance element for potentiometric devices, and method of manufacture
AssigneeBEI Technologies, Inc.
InventorRichard E. Riley
Life of this patent
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Abstract
Conductive plastic resistance element having particles of conductive material embedded therein and projecting therefrom for reducing variations in contact resistance in a potentiometric device in which the element is employed. The element is made by processing carbon powder, resin, solvent and conductive phases to form a paste, applying the paste to a substrate, and curing the paste to drive off the solvent and form a film, with the conductive phases rising to the surface of the film and becoming embedded therein.
Claims16
A conductive plastic resistance element having particles of conductive material embedded therein and projecting therefrom for contact by the wiper of a potentiometric device in which the resistance element is employed.
A resistance element for use in a potentiometric device having a wiper contact which engages the resistance element, comprising a carbon/plastic matrix with conductive phases for reducing variations in resistance between the wiper contact and the resistance element over the life of the device.
A method of manufacturing a conductive resistance element for use in a potentiometric device, comprising the steps of:
- processing carbon powder, resin, solvent and conductive phases to form a paste, applying the paste to a substrate, and curing the paste to drive off the solvent and form a film, with the conductive phases rising to the surface of the film and becoming embedded therein.
Dependencies are inferred from the claim text.