Patent ID: 7571987
Filing Date: 2009-08-11
Classification: B41J

Abstract:
1. An ink jet head that ejects ink droplets by exerting an electrostatic force on ink having dispersed charged particles, comprising: an insulating ejection substrate in which through holes for ejecting the ink droplets are formed; ejection electrodes, each being arranged in each of said through holes, respectively, and exerting the electrostatic force on the ink; and ink guides, each passing through each of said through holes, respectively, and protruding from an ink droplet ejection side of said insulating ejection substrate, wherein each of said ink guides comprises a flat plate shaped support part and a flat plate shaped tip end part that extends from an end portion of said support part having a predetermined thickness and is directed toward the ink droplet ejection side, said tip end part is formed so that a back surface of said tip end part is flush with a back surface of said support part, and said tip end part is thinner than said support part to form a step on a front surface side and is gradually narrowed toward the ink droplet ejection side, and said electrostatic force exerted on the ink has at least a component directed toward a tip end of an ink guide along said tip end part.