Patent ID: 7275812
Filing Date: 2007-10-02
Classification: B41J

Abstract:
1. An ink jet head for recording an image on a recording medium by ejecting ink containing charged fine particles by means of an electrostatic force, comprising: an ink guide whose tip end portion is directed toward a side of said recording medium; an ink flow path that supplies the ink to said ink guide; and an ejection electrode that comprises a surrounding electrode arranged so as to surround an outer periphery of said ink guide with a predetermined spacing, and ejects the ink guided from said ink flow path to the tip end portion of said ink guide by means of the electrostatic force, wherein a ratio between an effective inside diameter of said surrounding electrode and a distance from said surrounding electrode to a tip end of said ink guide protruding on the side of said recording medium is set in a range of 1:0.5 to 1:2.