ULTRASONIC SENSOR AND METHOD FOR CONTROLLING SAME

Title:

ULTRASONIC SENSOR AND METHOD FOR CONTROLLING SAME

Document Type and Number:

WIPO Patent Application WO/2016/167003

Kind Code:

A1

Abstract:

Provided is an ultrasonic sensor whereby reverberant vibration can be suppressed by a simpler circuit configuration than in the prior art. The ultrasonic sensor (100) is provided with a flat plate-shaped piezoelectric body (50) that includes an ultrasonic transmission region (50A) and an ultrasonic reflection wave reception region (50B), a shared electrode (30) provided in the transmission region (50A) and the reception region (50B), a transmission electrode (10) provided in the transmission region (50A), a reception electrode (20) provided in the reception region (50B), and a semiconductor element (107) for switching a channel (109) between a conducting state and a non-conducting state, the semiconductor element (107) being electrically connected to the transmission electrode (10) and the reception electrode (20). The semiconductor element (107) places the channel (109) in the conducting state after application of an alternating-current voltage is stopped, whereby a reverberation signal outputted from the reception region (50B) in accordance with ultrasonic reverberant vibration is fed back to the transmission electrode (10).

Inventors:

WATANABE KOSUKE (JP)
ICHIHARA SATOSHI (JP)

Application Number:

PCT/JP2016/052249

Publication Date:

October 20, 2016

Filing Date:

January 27, 2016

Export Citation:

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Assignee:

MURATA MANUFACTURING CO (JP)

International Classes:

G01S7/526; G01S7/521; G01S15/10; H04R3/00; H04R17/00

Domestic Patent References:

WO2006126401A1

2006-11-30

Foreign References:

JPH01270499A	1989-10-27
JPS61223683A	1986-10-04
JPH03276084A	1991-12-06
JP2004093163A	2004-03-25
JPH10213658A	1998-08-11
JP2012220434A	2012-11-12

Other References: