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:
Mar. 07, 2006
Filed:
Oct. 15, 2004
Harumasa Shibata, Tokyo, JP;
Akito Yokoi, Tokyo, JP;
Keizo Miyake, Shizuoka, JP;
Hidehiro Inaba, Shizuoka, JP;
Harumasa Shibata, Tokyo, JP;
Akito Yokoi, Tokyo, JP;
Keizo Miyake, Shizuoka, JP;
Hidehiro Inaba, Shizuoka, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Fuji Ceramics Corporation, Shizuoka, JP;
Abstract
A knock sensor of the invention includes a base having a cylindrical part mounted on a vibration generating part and a flange part, an annular piezoelectric element fitted to the cylindrical part and for converting a knocking vibration of the vibration generating part into an electric signal to detect it, electrodes respectively provided to be in contact with both surfaces of the piezoelectric element, terminal plates disposed to be in contact with the respective electrodes and for extracting an output of the piezoelectric element to outside, and a hold unit for pressure holding the piezoelectric element, the electrodes and the terminal plates to the flange part, in which the electrodes are provided to be in partial contact with the piezoelectric element, and an electric insulating material having an almost equal thickness to the electrode is provided on a portion of the piezoelectric element which is not in contact with the electrode.