Piezoelectric vibration angular velocity meter and camera using the same
Patent 5794080 Issued on August 11, 1998. Estimated Expiration Date: 
June 13, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 13, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesDriving circuit of a vibration wave motor Oscillation circuit Driving and detecting circuit of a vibrator Oscillator with increased reliability start up Oscillator unit Oscillation gyro and an inspection apparatus therefor Patent #: 5600063 InventorsAssigneeApplicationNo. 661788 filed on 06/13/1996US Classes:396/53, With accelerometer73/504.12, Vibratory mass310/317Input circuit for mechanical output from piezoelectric elementExaminersPrimary: Perkey, W. B.Attorney, Agent or FirmForeign Patent References
International ClassesG03B 005/00G01P 009/00 H01L 041/08 Foreign Application Priority Data1994-08-31 JPAbstractWhen a power switch is turned on, first and second analog switches are turned on while a third analog switch is turned off. Accordingly, at the time of starting, a forced excitation driving circuit supplies to a vibrator an oscillation output pulse which is substantially at the resonance frequency of the vibrator, thereby forcibly driving the vibrator in an excitation manner. Thereafter, when the vibrator substantially attains its stationary state and thereby the charged voltage of a capacitor reaches a threshold value of an inverter, the first and second analog switches are turned off while the third analog switch is turned on. Accordingly, the output of a self-excitation circuit is supplied to the electrode of the vibrator so as to vibrate the vibrator in a self-excitation manner. | |
