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:
Aug. 25, 2009
Filed:
Dec. 14, 2005
Hidetoshi Watanabe, Aichi-ken, JP;
Hidetoshi Watanabe, Aichi-ken, JP;
Brother Kogyo Kabushiki Kaisha, Nagoya-shi, Aichi-ken, JP;
Abstract
An ink jet printer is provided with an ink jet head. The ink jet head includes an ink passage body and an actuator. The ink passage body includes a nozzle, an ink chamber communicating with the nozzle, and a pressure chamber located between the nozzle and the ink chamber. The actuator includes a piezoelectric element facing the pressure chamber. The piezoelectric element includes a piezoelectric layer, a first electrode connected with a front face of the piezoelectric layer, a second electrode connected with a back face of the piezoelectric layer, and a first insulator located between the second electrode and the ink passage body. The ink jet printer further includes a device for maintaining the electric potentials of the ink passage body and the second electrode such that the electric potential of the ink passage body is equal to or below the electric potential of the second electrode.