Touch sensor
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United States of America Patent
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Nov 7, 1995
Issued Date -
N/A
app pub date -
Feb 16, 1994
filing date -
Jun 28, 1991
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A touch sensor has an LC oscillator circuit 1, 2, 3, and 4, a rectification circuit 10 which rectifies outputs of the oscillator circuit 1, 2, 3, and 4, a voltage detection circuit 12, 13, 14, and 15 which detects the rectified voltage, and a sensor plate 8 connected to the input section of the rectification circuit, and detecting contact of a finger with the sensor plate 8 by enabling the voltage detection circuit 12, 13, 14, and 15 to detects a drop of equivalent impedance due to a finger touching the sensor plate 8 as a change of voltage.
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