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:
Dec. 09, 2003
Filed:
Dec. 18, 1998
Yasushi Miura, Kawasaki, JP;
Hiroyuki Miyake, Kawasaki, JP;
Hiroyuki Kuriyama, Kawasaki, JP;
Masashi Shimizu, Kawasaki, JP;
Chikanobu Ikeda, Tokyo, JP;
Shigeru Watanabe, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A printing apparatus and a print control method which detect a defective printing element in operation failure status while reciprocate-scanning a printhead, and perform appropriate print control such as complementary printing on an unprinted portion by the defective printing element, without reducing the printing speed. An apparatus, to which the method is applied, has a photosensor to detect ink discharge statuses of a plurality of nozzles of a printhead which is provided between a home position of the printhead and the outside of an effective printing area where image printing is to be made. While the printhead is scanned, test ink discharge is performed at the position of the photosensor and the ink discharge statuses of the nozzles are detected by the photosensor A corrector analyzes the operation statuses of the nozzles of the printhead based on the results of detection in a real time manner. A CPU performs print control based on the results of analysis.