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ACCELERATION SENSOR

  • US 20080016963A1
  • Filed: 07/16/2007
  • Published: 01/24/2008
  • Est. Priority Date: 07/20/2006
  • Status: Active Grant
First Claim
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1. An acceleration sensor, comprising:

  • an oscillator unit for outputting an oscillator signal, the oscillator unit including;

    a first piezoelectric vibrating reed having a vibrating arm that performs bending vibration; and

    an oscillator circuit for oscillating the first piezoelectric vibrating reed;

    a phase shifting unit for shifting and outputting a given phase angle of an output signal of the oscillator unit;

    a phase shift circuit unit provided with a second piezoelectric vibrating reed having a vibrating arm that performs bending vibration, arranged at an output side of the phase shifting unit;

    a multiplier for multiplying the output signal of the phase shift circuit unit by the output signal of the oscillator circuit; and

    a phase shift modification output unit which receives an output from the multiplier and outputs a value corresponding to a change in a phase shift angle of an input-output signal of the phase shift circuit unit;

    a resonant frequency of the second piezoelectric vibrating reed being equal to a frequency of the output signal of the oscillator unit, in a state where no acceleration is applied.

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