Patent ID: 7205097

Claim:
A method for producing a liquid ejection head that ejects a solution, in which charged particles are dispersed, toward a counter electrode, comprising: a head substrate; a solution guide member formed on a surface of the head substrate so as to protrude and include a sharp-pointed portion having a sharply pointed tip end, with the sharp-pointed portion being formed by at least one of inclined surfaces and having a cross section that is reduced as a distance to the tip end is decreased; and a solution supply path having a solution outflow opening through which the solution flows out to the neighborhood of the sharp-pointed portion so as to form a solution flow around the inclined surfaces of the solution guide member, wherein the solution flow is formed around the tip end of the sharp-pointed portion in a direction going across the inclined surfaces and a part of the solution flow is guided to the tip end and is ejected as a droplet by means of an electrostatic force, wherein the solution supply path is formed by a solution guide member through-hole formed in a direction from a base portion of the solution guide member to the sharp-pointed portion, and wherein the solution guide member through-hole is connected with a head substrate through-hole formed in the head substrate on which the solution guide member is provided, and the solution is supplied from a surface of the head substrate on a side opposite to the surface of the head substrate, on which the solution guide member is provided, and passes through the head substrate through-hole, the method comprising the steps of: forming a photosensitive resin layer on the head substrate having the head substrate through-hole; molding a convex portion forming the sharp-pointed portion on a surface of the photosensitive resin layer in proximity to the head substrate through-hole by pressing a mold substrate against the surface of the photosensitive resin layer; exposing and photosensitizing the photosensitive resin layer in one of (i) a region corresponding to at least a part of the convex portion and a peripheral portion surrounding the head substrate through-hole of the head substrate and (ii) a region except for at least the corresponding region; and developing the photosensitized photosensitive resin layer to form the solution guide member on the head substrate and the solution guide member through-hole that is connected with the head substrate through-hole and forms the solution supply path.