Rotational type variable resistor

Details Rotational type variable resistor Rotational type variable resistor

1990-03-30

1992-03-03

Lateef, Marvin M.

Electrical resistors

Mechanically variable

Movable contact electrically adjustable over length of...

338306, H01C 1032

Patent

active

050936484

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.

REFERENCES:
patent: 3750081 (1973-07-01), Miller
patent: 4495524 (1985-01-01), Kakuhashi et al.
patent: 4751492 (1988-06-01), Tsuzuki et al.
patent: 4785277 (1988-11-01), Yashiro et al.
patent: 4864273 (1989-09-01), Tsuzuki et al.
patent: 4933661 (1990-06-01), Oda et al.

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