Ultrasonic sensor and electronic device
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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Abstract
An ultrasonic sensor includes a plurality of ultrasonic wave elements each including a first electrode and a second electrode, and a control circuit configured to switch parallel connection and serial connection of the plurality of the ultrasonic wave elements.
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Citations
11 Claims
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1. An ultrasonic sensor comprising:
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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, and during 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. - View Dependent Claims (2, 5, 6, 7, 10, 11)
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3. An ultrasonic sensor comprising:
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a plurality of ultrasonic wave elements each including a first electrode and a second electrode; a control circuit configured to switch parallel connection and serial connection of the plurality of the ultrasonic wave elements; a plurality of first electrode switches respectively connected to the first electrodes of the ultrasonic wave elements; and a plurality of second electrode switches respectively connected to the second electrodes of the ultrasonic wave elements, wherein the control circuit includes a common-electrode connection wiring connected to a common electrode, and a serial connection wiring serially connecting the ultrasonic wave elements, the control circuit is configured and arranged to connect the second electrode switches to the common-electrode connection wiring during the parallel connection, and to connect the first electrode switches and the second electrode switches to the serial connection wiring during the serial connection. - View Dependent Claims (4, 8, 9)
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Specification