Method of evaluating natural frequency of piezoelectric vibrator, method of driving transducer, signal transmitting/receiving device, and drive system
AssigneeRohm Co., Ltd.
InventorTakashi Naiki
Life of this patent
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Abstract
A method of evaluating a natural frequency of a piezoelectric vibrator including a vibrating membrane and a piezoelectric element, includes: transmitting a drive signal to the piezoelectric element for a certain period of time so as to allow the vibrating membrane to vibrate; acquiring information about a power-generating wave of the piezoelectric vibrator after stopping the transmission of the drive signal to the piezoelectric element; and determining a frequency of the drive wave at which a value of a voltage of the power-generating wave is maximum as the natural frequency of the piezoelectric vibrator, based on the information about the power-generating wave.
Claims10
A method of evaluating a natural frequency of a piezoelectric vibrator including a vibrating membrane and a piezoelectric element, the method comprising:
- transmitting a drive signal to the piezoelectric element for a certain period of time so as to allow the vibrating membrane to vibrate;
- acquiring information about a power-generating wave of the piezoelectric vibrator after stopping the transmission of the drive signal to the piezoelectric element;
- and
- determining a frequency of a drive wave for the drive signal at which a value of a voltage of the power-generating wave is maximum as the natural frequency of the piezoelectric vibrator, based on the information about the power-generating wave.
A method of evaluating a natural frequency of a vibrator including a vibrating membrane, a shaft having a first end connected to the vibrating membrane, and a frame connected to a second end of the shaft and configured to surround the vibrating membrane while being spaced apart from the vibrating membrane, the method comprising:
- transmitting a drive signal to the vibrator to vibrate the vibrating membrane;
- acquiring current information by an electromagnetic induction from a wiring arranged on the vibrating membrane after stopping the transmission of the drive signal to the vibrator;
- and
- determining a frequency of a drive wave for the drive signal with a largest current value as the natural frequency of the vibrator, based on the current information.
Dependencies are inferred from the claim text.