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. 03, 2009
Filed:
Nov. 30, 2006
Hidetoshi Watanabe, Tokoname, JP;
Toshihumi Kubo, Kirishima, JP;
Hidetoshi Watanabe, Tokoname, JP;
Toshihumi Kubo, Kirishima, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Abstract
A piezoelectric actuator includes a piezoelectric vibrating plate including piezoelectric ceramics, an internal electrode formed on a first surface of the piezoelectric vibrating plate, a piezoelectric layer formed on the internal electrode, and a plurality of surface electrodes that are provided on a surface of the piezoelectric layer. When the internal electrode is grounded and a predetermined voltage is applied to a liquid contacting with a second surface of the piezoelectric vibrating plate, a value of a current flowing between the liquid and the internal electrode is not more than 0.01 μA.