Electrostatic capacitance detecting device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Sep 10, 2002
Grant Date -
N/A
app pub date -
Oct 25, 2000
filing date -
Oct 26, 1999
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Bias charge is injected from a bias power supply line 3 into a detecting electrode 11 constituting an electrostatic capacitance element between an object to be detected to accumulate charge in accordance with its electrostatic capacitance, and when the charge is distributed between the electrostatic capacitance element and a capacitance element 12 which has been reset to a reset potential, a holding voltage of the capacitance element 12 changes in accordance with the amount of charges accumulated in the detecting electrode 11, and thus a signal is outputted regarding the change in holding voltage as an amount of change in gate potential of a source follower amplifier element 13, thereby detecting the capacitance of the electrostatic capacitance element between the object to be detected and the detecting electrode 11.
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