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:
Aug. 13, 2002
Filed:
Apr. 05, 1999
Applicant:
Inventor:
Junhua Chang, Nagano, JP;
Assignee:
Seiko Epson Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B41J 2/938 ; B41J 2/045 ;
U.S. Cl.
CPC ...
B41J 2/938 ; B41J 2/045 ;
Abstract
Disclosed is a method of driving an ink jet printhead having flexural or longitudinal vibration mode piezoelectric elements. The method includes a contracting step for expanding the pressure generating chamber until a velocity of the trailing edge of the ejected ink drop is substantially zero at a position near the nozzle orifice. The printhead ejects an ink drop having small volume without a reduction in ink drop velocity.