Capacitive distance sensor
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United States of America Patent
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-
Aug 20, 2002
Issued Date -
N/A
app pub date -
Jul 11, 2000
filing date -
Feb 14, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A distance sensor has a capacitive element in turn having a first capacitor plate which is positioned facing a second capacitor plate whose distance is to be measured. In the case of fingerprinting, the second capacitor plate is defined directly by the skin surface of the finger being printed. The sensor comprises an inverting amplifier, between the input and output of which the capacitive element is connected to form a negative feedback branch. By supplying an electric charge step to the input of the inverting amplifier, a voltage step directly proportional to the distance being measured is obtained at the output.
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