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:
Feb. 03, 2004
Filed:
Oct. 15, 2002
Chang Junhua, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A liquid jetting head is provided with a pressure chamber, a piezoelectric vibrator which causes pressure fluctuation to the pressure chamber and a nozzle orifice communicated with the pressure chamber. A drive signal generator generates, in every jetting period, a drive signal including a base potential, an initial and termination potential which is a drive potential higher than the base potential, and at least one ejection pulse signal for ejecting a liquid droplet from the nozzle orifice. A drive signal supplier selectively supplies the ejection pulse signal to the piezoelectric vibrator in accordance with jetting data which indicates whether a liquid jetting is performed. A jetting data storage stores the jetting data with regard to each of successive two jetting periods including a present jetting period. A vibrator potential adjuster changes a potential of the piezoelectric vibrator to the base potential when the jetting data stored in the jetting data storage indicates that the liquid jetting is not performed in a latter jetting period, and changes the potential of the piezoelectric vibrator to the drive potential before the ejection pulse is supplied when the jetting data indicates that the liquid jetting is performed in the latter jetting period.