Ultrasonic apparatus
AssigneeMurata Manufacturing Co., Ltd.
InventorsMotoyasu NAKAO, Kosuke WATANABE
Life of this patent
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Abstract
An ultrasonic apparatus includes a transmitting circuit, an ultrasonic transducer, a receiving circuit, and a capacitance measuring circuit. The ultrasonic transducer is a three-terminal ultrasonic transducer that includes a transmitting electrode, a receiving electrode, and a common electrode. The transmitting circuit outputs a driving signal to the transmitting electrode to cause the ultrasonic transducer to transmit ultrasonic waves. The receiving circuit receives a receive signal from the receiving electrode. The capacitance measuring circuit is electrically connected to the receiving electrode to measure the electrostatic capacitance of the ultrasonic transducer.
Claims14
An ultrasonic apparatus comprising:
- a three-terminal ultrasonic transducer including a common electrode, a transmitting electrode, and a receiving electrode independent of the transmitting electrode;
- a transmitting circuit to output a driving signal to the transmitting electrode to cause the ultrasonic transducer to transmit ultrasonic waves;
- a receiving circuit to receive a receive signal from the receiving electrode;
- and
- a capacitance measuring circuit electrically connected to the receiving electrode to measure an electrostatic capacitance of the ultrasonic transducer.
Dependencies are inferred from the claim text.