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:
May. 28, 2013
Filed:
Sep. 29, 2011
Noriaki Yamashita, Shiojiri, JP;
Noriaki Yamashita, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A piezoelectric vibrator varies the pressure in a pressure chamber in accordance with a drive signal, whereby ink contained in the pressure chamber is ejected from a nozzle. The drive signal includes a slight-vibration pulse used to change the pressure in the pressure chamber to an extent that the ink is not ejected. The slight-vibration pulse includes a first changing component in which the potential changes from a reference potential in a negative direction in which the pressure in the pressure chamber is increased by the piezoelectric vibrator, a second changing component which is generated to follow the first changing component and in which the potential changes so as to cross the reference potential in a positive direction, and a third changing component which is generated to follow the second changing component and in which the potential changes to the reference potential in the negative direction.