The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 1992
Filed:
Mar. 30, 1990
Masahiro Kimura, Aichi, JP;
Kenji Hayase, Aichi, JP;
Yukihisa Oda, Aichi, JP;
Toshiyuki Kobayashi, Aichi, JP;
Takayoshi Tsuzuki, Aichi, JP;
Aisin Seiki K.K., Aichi, JP;
Abstract
A rotational type variable resistor includes a base plate having an arcuate resistance element and an arcuate electrode formed on one surface thereof. A shaft adapted to be connected to the control member is rotatably mounted in the housing and carries a pair of brushes which are disposed in sliding engagement with the resistance member and the electrode. The resistance element is formed from a first resistance layer deposited on the base plate between a pair of copper foil electrodes. A silver paste is disposed between the copper foil electrodes and the opposite ends of the first resistance layer and a second resistance layer is formed which completely overlies the first resistance layer and the copper foil electrodes. The arcuate electrode includes a first layer of copper foil disposed on the surface of the substrate. A silver paste is coated on the upper surface of the copper foil and a third resistance layer is disposed on the surface of the silver paste, and a fourth resistance layer covers the third resistance layer. The resistivity of the first and third layers differs from the resistivity of the second and fourth layers.