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Gyro sensor of an electrostatic driving and capacitance detecting type

  • US 7,322,237 B2
  • Filed: 05/23/2006
  • Issued: 01/29/2008
  • Est. Priority Date: 06/14/2005
  • Status: Expired due to Fees
First Claim
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1. A gyro sensor, comprising:

  • a vibrator which is possible to be vibrated in self-excitation;

    outputs a first detecting signal indicating an oscillating amplitude and an oscillating frequency in the vibration of the vibrator when the vibrator is set in a condition of self-excitation, and outputs a second detecting signal indicating a yaw added to the vibrator;

    a driving circuit which generates a first voltage, generates a control signal from the first detecting signal outputted from the vibrator, boosts the first voltage to a second voltage in response to the control signal to generate a driving signal set at both the second voltage and a driving frequency from the control signal, and transmits the driving signal to the vibrator to continue self-excitation of the vibrator in response to the driving signal; and

    a yaw detecting circuit which generates a sensor signal corresponding to the yaw from the second detecting signal of the self-excited vibrator and outputs the sensor signal,wherein the sensor further comprises a starting circuit which supplies a start signal of a start frequency to the driving circuit and causes the driving circuit to generate an oscillation encouraging signal in response to the start signal by boosting the first voltage to a voltage of the oscillation encouraging signal such that the self-excitation of the vibrator is started in response to the oscillation encouraging signal.

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