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US 2003/0146418 A1Published application
Resistive film
AssigneeCTS Corporation
InventorAntony P. Chacko
Life of this patent
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Abstract
A resistive film for use in a potentiometer. The film is in contact with a movable wiper. The film includes a cured polymer resin and a cured thermosetting resin. Conductive particles of carbon black and graphite are dispersed in the film. The conductive particles cause the resins to be electrically resistive. Carbon nanoparticles are also dispersed in the film. The nanoparticles increase the wear resistance of the resistive film and reduce electrical noise as the wiper moves across the film.
Claims22
A resistive film for use in a potentiometer, the film being contacted by a movable wiper, the film comprising:
- a) a cured polymer resin;
- b) a plurality of conductive particles selected from the group consisting of carbon black, graphite and mixtures thereof, the conductive particles causing the resins to be electrically conductive;
- and
- c) a plurality of nanoparticles, the nanoparticles increasing wear resistance and reducing electrical noise of the resistive film.
1 more element
A potentiometer comprising:
- a) a planar substrate having a surface;
- b) a film disposed on the surface of the substrate, the film including:
- b1) a polymer resin;
- b2) a thermosetting resin;
- b3) 10-35 percent by weight of conductive particles selected from the group consisting of carbon black, graphite and mixtures thereof;
- b4) 0.025-20 wt. percent by weight of carbon nanoparticles selected from the group consisting of vapor grown carbon fibers, carbon nanotubes, milled carbon fibers and mixtures thereof;
- and
- c) a movable wiper in contact with the film, the wiper movable across the film, the carbon nanoparticles reducing wear between the wiper and the film as the wiper moves across the film.
5 more elements
Dependencies are inferred from the claim text.