PHYSICAL QUANTITY DETECTOR
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United States of America Patent
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Issued Date -
Feb 5, 2015
app pub date -
Jul 31, 2014
filing date -
Aug 1, 2013
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Abandoned
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Abstract
A physical quantity detector includes a first displacement detector configured by a pair of capacitors, which are configured by first movable electrodes formed on a pendulum, and a pair of first fixed electrodes; a second displacement detector provided below the first displacement detector, and configured by a pair of capacitors, which are configured by second movable electrodes formed on the pendulum, and a pair of second fixed electrodes; a first detection circuit detecting a difference between capacitance values of each of the pair of capacitors of the first displacement detector; a second detection circuit detecting the difference between the capacitance values of each of the pair of capacitors of the second displacement detector; and an instrumentation amplifier calculating a difference between the differences in the capacitance values detected by the first detection circuit and the second detection circuit.
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