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:
Nov. 23, 2004
Filed:
Jul. 13, 2001
Applicant:
Inventor:
Toshimori Miyakoshi, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/938 ;
U.S. Cl.
CPC ...
B41J 2/938 ;
Abstract
An optimum drive energy for a print head is supplied over an extended period of time to provide consistently good image quality without troublesome operation by the user. Temperature of the print head is monitored while varying the drive energy. A threshold value of drive energy required for ink ejection is judged using the drive energy and temperature data. An optimum drive condition is determined on the basis of the threshold value and, when the determined drive condition is different from drive condition information stored in the ink jet print head, the drive energy supplied to the ink jet print head is changed.