Capacitor coupled potentiometer
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United States of America Patent
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-
Jun 11, 1996
Grant Date -
N/A
app pub date -
Mar 30, 1994
filing date -
Nov 10, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An annular resistor member having two non-contact ends is overlaid and adhered on the surface of a base, and a rotational shaft located at the central portion of the resistor member is pivotally axially supported via a bearing. A bent electrode arm is fitted on the rotational shaft, and is connected to an output terminal via the rotational shaft or a connection means. A movable electrode, which opposes to the resistor member via a gap, is integrally formed on the end portion of the electrode arm, and a capacitor is formed between the movable electrode and the resistor member. In the above structure, when an AC power supply is flowed across the two ends of the resistor member, the capacitor is formed between the movable electrode and the resistor member, and an attenuated voltage is generated on the movable electrode. The voltage generated on the movable electrode increases/decreases in accordance with the displacement of the movable electrode upon rotation of the rotational shaft, and when this voltage is extracted as a resistance dividing ratio from the output terminal, the rotational angle or displacement amount of the rotational shaft can be detected.
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