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Ultrasonic sensor and electronic device

  • US 9,774,358 B2
  • Filed: 06/22/2015
  • Issued: 09/26/2017
  • Est. Priority Date: 01/25/2011
  • Status: Active Grant
First Claim
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1. An ultrasonic sensor comprising:

  • a plurality of ultrasonic wave elements each including a first electrode and a second electrode;

    a transmitting circuit configured to output signals for ultrasonic wave transmission to the plurality of the ultrasonic wave elements;

    a receiving circuit configured to receive signals outputted from the plurality of the ultrasonic wave elements;

    a serial connection wiring configured to serially connect the ultrasonic wave elements, the serial connection wiring being configured to be connected to the receiving circuit; and

    a control circuit configured to switch between parallel connection of the plurality of the ultrasonic wave elements to the transmitting circuit and serial connection of the plurality of the ultrasonic wave elements to the receiving circuit,during the parallel connection, the control circuit being configured to connect each of the plurality of the ultrasonic wave elements to the transmitting circuit and disconnect the plurality of the ultrasonic wave elements from the serial connection wiring, andduring the serial connection, the control circuit being configured to connect the plurality of the ultrasonic wave elements to the serial connection wiring and disconnect the plurality of the ultrasonic wave elements from the transmitting circuit.

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