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:
Feb. 28, 2012
Filed:
Apr. 26, 2011
Toshiyasu Sakai, Kawasaki, JP;
Ichiro Saito, Yokohama, JP;
Teruo Ozaki, Yokohama, JP;
Sakai Yokoyama, Kawasaki, JP;
Takahiro Matsui, Yokohama, JP;
Takuya Hatsui, Toyo, JP;
Kazuaki Shibata, Kawasaki, JP;
Toshiyasu Sakai, Kawasaki, JP;
Ichiro Saito, Yokohama, JP;
Teruo Ozaki, Yokohama, JP;
Sakai Yokoyama, Kawasaki, JP;
Takahiro Matsui, Yokohama, JP;
Takuya Hatsui, Toyo, JP;
Kazuaki Shibata, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
In an ink jet head using a thermal energy for ejecting ink, this invention aims to reliably and uniformly remove kogations deposited on a heat application portion in contact with the ink. To realize this objective, the upper protective layer is arranged in an area including the heat application portion so that it can be electrically connected to serve as an electrode which causes an electrochemical reaction with the ink. The upper protective layer is formed of a material containing a metal which is dissolved by the electrochemical reaction and which does not form, on heating, an oxide film which hinders the dissolution. With this arrangement, a reliable electrochemical reaction can be produced to dissolve a surface layer of the upper protective layer, thereby removing kogations on the heat application portion reliably and uniformly.