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. 10, 2002
Filed:
May. 13, 1999
Koji Kawaguchi, Chiba, JP;
Tatsuru Sato, Chiba, JP;
Seiji Kuwahara, Chiba, JP;
Hiroyuki Muramatsu, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
A recording head has a head portion having a common electrode, an ink chamber for storing ink, and an ink ejection port. A counter electrode is disposed opposite to and spaced-apart from the common electrode and proximate the ink ejection port of the head portion to form a gap between the counter electrode and the ink ejection port for receiving a recording medium. The counter electrode has recording electrodes extending generally perpendicular to a lengthwise direction of the common electrode. A power source applies a voltage between the common electrode and the counter electrode to generate an electric field therebetween. A control circuit independently controls the voltage applied to each of the recording electrodes to generate an electrostatic force for electrically charging the ink disposed in the ink chamber so that the electrically charged ink flows from the ink chamber, is ejected through the ejection port, and is outputted onto the recording medium.