The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 25, 2006
Filed:
Apr. 09, 2003
Hideki Ishikawa, Aichi, JP;
Yoshikuni Sato, Aichi, JP;
Keigo Banno, Aichi, JP;
Masashi Sakamoto, Aichi, JP;
Noboru Ishida, Gifu, JP;
Takafumi Oshima, Aichi, JP;
Hideki Ishikawa, Aichi, JP;
Yoshikuni Sato, Aichi, JP;
Keigo Banno, Aichi, JP;
Masashi Sakamoto, Aichi, JP;
Noboru Ishida, Gifu, JP;
Takafumi Oshima, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A detecting-element assembly () is configured such that a piezoelectric element () is housed in a casing body portion () of a casing (), and is attached to a housing portion () of a flow path formation member () via a flange portion (). Therefore, the path between the piezoelectric element () and the position of attachment of the detecting-element assembly () is elongated, whereby ultrasonic waves which leak into the interior of the detecting-element assembly () from the piezoelectric element () become unlikely to reflectively return from a joint. Thus, the influence of, for example, noise stemming from reflected waves is reduced, thereby enhancing the accuracy of detection. An average clearance of 1 millimeter or more is provided along the outer circumferential surface of the casing body portion () of the detecting-element assembly (), whereby a problem of collected foreign matter is unlikely to occur.