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:
Apr. 22, 2003
Filed:
Dec. 14, 2001
Kazuo Shimizu, Hitachinaka, JP;
Takahiro Yamada, Hitachinaka, JP;
Shinya Kobayashi, Hitachinaka, JP;
Kunio Satou, Hitachinaka, JP;
Hitoshi Kida, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An ink jet recording device includes a plurality of head modules each formed with a plurality of nozzles. The ink jet recording device prints a test pattern using the all nozzle of the head modules . Precise positions of dots forming the test pattern are detected, based on which positional shifts of the head modules are calculated. The deflection amount and ink ejection timing for each head module are changed based on the detected positional shift. In this manner, positional shifts of the assembled head modules are electrically corrected without mechanically changing the physical positions of the head modules