ULTRASONIC SENSOR, AND ITS MANUFACTURING METHOD

Title:

ULTRASONIC SENSOR, AND ITS MANUFACTURING METHOD

Document Type and Number:

WIPO Patent Application WO/2007/102460

Kind Code:

A1

Abstract:

Provided are an ultrasonic sensor capable of acquiring stable sending-receiving characteristics and acquiring a desired directivity in a simple and inexpensive manner, and a method for manufacturing the ultrasonic sensor. The ultrasonic sensor (10) includes a base (12) made of a synthetic resin. The base (12) has a cylindrical side face portion (14), and has a ring-shaped bent portion (16) bent inward from the opening of one end of the side face portion (14). A ring-shaped recess (18) is formed in the end portion of the inner face side of the bent portion (16). A piezoelectric element (20) is arranged in the recess (18). A sound-absorbing member (28) and a weight (24) are inserted and fixed in the base (12). A sheath member (30) made of a synthetic resin is formed from the outer side of the base (12) on the outer face of the piezoelectric element (20) and the outer face of the base (12).

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Inventors:

OTA JUNSHI (JP)

Application Number:

PCT/JP2007/054178

Publication Date:

September 13, 2007

Filing Date:

March 05, 2007

Export Citation:

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Assignee:

MURATA MANUFACTURING CO (JP)
OTA JUNSHI (JP)

International Classes:

H04R17/00; H01L41/08; H04R31/00

Foreign References:

JPH02145859U	1990-12-11
JPS6277998U	1987-05-19
JPH04258100A	1992-09-14
JPH08340598A	1996-12-24
JPH09252498A	1997-09-22
JP2005072771A	2005-03-17
JP2004253911A	2004-09-09

Other References: