ULTRASONIC SENSOR AND ELECTRONIC DEVICE
First Claim
1. An ultrasonic sensor comprising:
- a plurality of transmission/reception dual-use elements configured and arranged to transmit and receive ultrasonic waves, each of the transmission/reception dual-use elements including a first electrode and a second electrode;
a plurality of first electrode switches respectively connected to the first electrodes of the transmission/reception dual-use elements;
a plurality of second electrode switches respectively connected to the second electrodes of the transmission/reception dual-use elements;
a control circuit configured and arranged to control transmission and reception of the ultrasonic waves of the transmission/reception dual-use elements;
a transmitting circuit configured and arranged to output signals for ultrasonic wave transmission to the transmission/reception dual-use elements;
a receiving circuit configured and arranged to receive signals outputted from the transmission/reception dual-use elements when ultrasonic waves are received by the transmission/reception dual-use elements;
a common-electrode connection wiring connected to a common electrode; and
a serial connection wiring serially connecting the transmission/reception dual-use elements, whereinwhen an ultrasonic signal is to be transmitted, the control circuit is configured and arranged to connect the first electrode switches to the transmitting circuit, and to connect the second electrode switches to the common-electrode connection wiring so that the transmission/reception dual-use elements are connected in parallel to the transmitting circuit and the common electrode, andwhen an ultrasonic signal is to be received, the control circuit is configured and arranged to connect the first electrode switches and the second electrode switches to the serial connection wiring so that the transmission/reception dual-use elements are serially connected to the receiving circuit.
1 Assignment
0 Petitions
Accused Products
Abstract
The ultrasonic sensor includes: a plurality of transmission/reception dual-use elements, first electrode switches connected to the first electrodes of the transmission/reception dual-use elements; second electrode switches connected to the second electrodes of the transmission/reception dual-use elements; a control circuit; a transmitting circuit; a receiving circuit; a common-electrode connection wiring; and serial connection wiring. When an ultrasonic signal is to be transmitted, the control circuit connects the first electrode switches to the transmitting circuit, connects the second electrode switches to the common-electrode connection wiring so that the transmission/reception dual-use elements are connected in parallel to the transmitting circuit and the common electrode. When an ultrasonic signal is to be received, the control circuit connects the first electrode switches and the second electrode switches to the serial connection wiring so that the transmission/reception dual-use elements are serially connected to the receiving circuit.
29 Citations
18 Claims
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1. An ultrasonic sensor comprising:
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a plurality of transmission/reception dual-use elements configured and arranged to transmit and receive ultrasonic waves, each of the transmission/reception dual-use elements including a first electrode and a second electrode; a plurality of first electrode switches respectively connected to the first electrodes of the transmission/reception dual-use elements; a plurality of second electrode switches respectively connected to the second electrodes of the transmission/reception dual-use elements; a control circuit configured and arranged to control transmission and reception of the ultrasonic waves of the transmission/reception dual-use elements; a transmitting circuit configured and arranged to output signals for ultrasonic wave transmission to the transmission/reception dual-use elements; a receiving circuit configured and arranged to receive signals outputted from the transmission/reception dual-use elements when ultrasonic waves are received by the transmission/reception dual-use elements; a common-electrode connection wiring connected to a common electrode; and a serial connection wiring serially connecting the transmission/reception dual-use elements, wherein when an ultrasonic signal is to be transmitted, the control circuit is configured and arranged to connect the first electrode switches to the transmitting circuit, and to connect the second electrode switches to the common-electrode connection wiring so that the transmission/reception dual-use elements are connected in parallel to the transmitting circuit and the common electrode, and when an ultrasonic signal is to be received, the control circuit is configured and arranged to connect the first electrode switches and the second electrode switches to the serial connection wiring so that the transmission/reception dual-use elements are serially connected to the receiving circuit. - View Dependent Claims (2, 5, 6, 7, 8, 9, 10, 11, 14, 15, 16, 17, 18)
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3. An ultrasonic sensor comprising:
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first and second transmission/reception dual-use elements configured and arranged to transmit and receive ultrasonic waves, each of the first and second transmission/reception dual-use elements including a first electrode and a second electrode; a first switch connected to the first electrode of the first transmission/reception dual-use element; a second switch connected to the second electrode of the first transmission/reception dual-use element; a third switch connected to the first electrode of the second transmission/reception dual-use element; a fourth switch connected to the second electrode of the second transmission/reception dual-use element; a control circuit configured and arranged to control transmission and reception of ultrasonic waves of the first and second transmission/reception dual-use elements; a transmitting circuit configured and arranged to output signals for ultrasonic wave transmission to the first and second transmission/reception dual-use elements; a receiving circuit configured and arranged to receive signals outputted from the first and second transmission/reception dual-use elements when ultrasonic waves are received by the first and second transmission/reception dual-use elements; a common-electrode connection wiring connected to a common electrode; and a serial connection wiring, wherein when an ultrasonic signal is to be transmitted, the control circuit is configured and arranged to connect the first switch and the third switch to the transmitting circuit, and to connect the second switch and the fourth switch to the common-electrode connection wiring, and when an ultrasonic signal is to be received, the control circuit is configured and arranged to connect the first switch and the fourth switch to the serial connection wiring, and to connect the second switch and the third switch to the receiving circuit. - View Dependent Claims (12)
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4. An ultrasonic sensor comprising:
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first to fourth transmission/reception dual-use elements configured and arranged to transmit and receive ultrasonic waves, each of the first to fourth transmission/reception dual-use elements including a first electrode and a second electrode; a first switch connected to the first electrode of the first transmission/reception dual-use element; a second switch connected to the second electrode of the first transmission/reception dual-use element; a third switch connected to the first electrode of the second transmission/reception dual-use element; a fourth switch connected to the second electrode of the second transmission/reception dual-use element; a fifth switch connected to the first electrode of the third transmission/reception dual-use element; a sixth switch connected to the second electrode of the third transmission/reception dual-use element; a seventh switch connected to the first electrode of the fourth transmission/reception dual-use element; an eighth switch connected to the second electrode of the fourth transmission/reception dual-use element; a control circuit configured and arranged to control transmission and reception of ultrasonic waves of the first to fourth transmission/reception dual-use elements; a transmitting circuit configured and arranged to output signals for ultrasonic wave transmission to the first to fourth transmission/reception dual-use elements; a receiving circuit configured and arranged to receive signals outputted from the first to fourth transmission/reception dual-use elements when ultrasonic waves are received by the first to fourth transmission/reception dual-use elements; a common-electrode connection wiring connected to a common electrode; and first to third serial connection wirings, wherein when an ultrasonic signal is to be transmitted, the control circuit is configured and arranged to connect the first, third, fifth, and seventh switches to the transmitting circuit, and to connect the second, fourth, sixth, eighth switches to the common-electrode connection wiring, and when an ultrasonic signal is to be received, the control circuit is configured and arranged to connect the first switch and the fourth switch to the first serial connection wiring, to connect the third switch and the sixth switch to the second serial connection wiring, to connect the fifth switch and the eighth switch to the third serial connection wiring, and to connect the second switch and the seventh switch to the receiving circuit. - View Dependent Claims (13)
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Specification