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:
Jul. 25, 2000
Filed:
Nov. 07, 1997
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A high-yield printhead where density unevenness is surely corrected taking into consideration various factors related to manufacturing processes of the printhead, a printer utilizing the printhead, and an apparatus and method for correcting print density unevenness by the printhead, are provided. According to the method, a plurality of correction tables generated based on the data reflecting the various factors related to manufacturing processes of the printhead are prepared in advance. A test print pattern is printed by using a full-line printhead having a memory for storing correction data, and a tendency of density distribution of the printed pattern image is analyzed. On the basis of the tendency of the density distribution obtained as a result of the analysis, the most appropriate correction table is selected from the plurality of stored correction tables. Then, correction data which is used for suppressing density unevenness is generated on the basis of the selected most appropriate correction table, and the generated correction data is transmitted to the memory of the printhead.