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. 06, 2013
Filed:
Aug. 16, 2011
Masataka Nagai, Yokohama, JP;
Yoshinori Tagawa, Yokohama, JP;
Satoshi Ibe, Yokohama, JP;
Kazuhiro Asai, Kawasaki, JP;
Hiroyuki Murayama, Kawasaki, JP;
Mitsuru Chida, Yokohama, JP;
Masataka Nagai, Yokohama, JP;
Yoshinori Tagawa, Yokohama, JP;
Satoshi Ibe, Yokohama, JP;
Kazuhiro Asai, Kawasaki, JP;
Hiroyuki Murayama, Kawasaki, JP;
Mitsuru Chida, Yokohama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A liquid ejection head includes a member having ejection ports and dummy ejection ports. The ejection ports are provided in correspondence with energy-generating elements used in ejecting liquid. The dummy ejection ports are provided in correspondence with a light-receiving element outputting current whose level changes in accordance with the intensity of light applied thereto. By detecting the level of current that is output from the light-receiving element, the shapes of the ejection ports are estimated.