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. 18, 2001
Filed:
Sep. 22, 1998
Taeko Murai, Yokohama, JP;
Shuzo Matsumoto, Yokohama, JP;
Mitsumi Fujii, Yokohama, JP;
Tomoaki Nakano, Kawasaki, JP;
Hideyuki Makita, Yokohama, JP;
Yoshihisa Ohta, Hachioji, JP;
Shinichi Kakuda, Yokohama, JP;
Tetsuro Hirota, Hadano, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
An ink jet printing apparatus includes an ink jet head having a plurality of nozzles for respectively ejecting ink drops, a plurality of ink chambers communicating with the nozzles, and a plurality of electromechanical conversion elements corresponding to the respective nozzles. The volume of the ink chamber of the non-drive channel is increased by the influence of the drive channel adjacent thereto, and thereby undesired ejection of the ink drop occurs. To solve this problem, a drive energy set for ejecting the ink drop is applied to the piezoelectric elements of the drive chambers n−1, n+1 and a reduced drive energy set for not ejecting the ink drops is applied to the piezoelectric element of the non-drive channel n.