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. 26, 2002
Filed:
Jan. 31, 2000
Hirofumi Teramae, Nagano, JP;
Satoru Hosono, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A drive signal for driving a ink jet recording head as an actuator device indudes an expansion potential for deforming the piezoelectric actuator so as to expand the pressure generating chamber, a contraction potential for deforming the piezoelectric actuator so as to contract the pressure generating chamber, an ejection element for varying a potential of the drive signal from the expansion potential to the contraction potential to eject the ink drop from the nozzle, and a contraction holding element for holding the second potential to keep the contracted state of the pressure generating chamber. A duration of the ejection element is determined so as to match with a natural period of the piezoelectric actuator. A duration of the contraction holding element is determined such that a resulting value by adding the duration of the ejection element and the duration of the contraction holding element is matched with a natural period of the pressure generating chamber.