Patent ID: 7296879
Filing Date: 2007-11-20
Classification: B41J

Abstract:
1. A liquid ejection head that ejects droplets by causing an electrostatic force to act on a solution in which charged particles are dispersed, comprising: a through-hole substrate in which at least one through-hole, through which said droplets are ejected, is formed; an electrical insulating head substrate arranged to be spaced apart from said through-hole substrate by a predetermined distance, wherein a gap between said through-hole substrate and said electrical insulating head substrate being defined as a flow path of said solution; at least one solution guide, each being mounted at each position corresponding to each through-hole on a first surface of said electrical insulating head substrate on a through-hole substrate side, a tip end portion of each solution guide passing through and protruding from each through-hole, and each solution guide gradually narrowing toward said tip end portion; at least one control electrode, each being provided on said first surface of said electrical insulating head substrate so that a center of each control electrode approximately coincides with each solution guide and causing said electrostatic force to act on said solution, at least one electrode drawing portion, each being connected to each control electrode and passing through said electrical insulating head substrate from said first surface to a second surface on a back side opposite to said first surface; and a wiring portion provided on said second surface of said electrical insulating head substrate and connecting to each other said at least one electrode drawing portion and voltage application means for applying a voltage to said at least one control electrode.