Patent ID: 7419248
Filing Date: 2008-09-02
Classification: B41J

Abstract:
1. An ink jet head for ejecting ink by utilizing an electrostatic force to fly the ejected ink towards a recording medium, said ink jet head comprising: an ejection port substrate having ejection ports bored therethrough, said ink droplet being to be ejected from said ejection ports; a head substrate disposed at a predetermined distance from said ejection port substrate so as to define an ink flow path, which is common to said ejection ports, between said ejection port substrate and said head substrate, said ink flow path supplying said ink to said ejection ports; channel separation walls disposed on said head substrate within said ink flow path which is common to said ejection ports, each of said channel separation walls being located in a position corresponding to each of said ejection ports; and ejection electrodes for controlling the ejection of the ink, each of said ejection electrodes being located in a position corresponding to each of said ejection ports, wherein said ejection electrodes are provided on at each of a surface of said head substrate facing said ejection port substrate and said channel separation wall, and wherein said ejection electrodes are positioned on a slightly downstream side with respect to the center of said ejection port of said ejection port substrate in a direction of said ink flow path.