Patent ID: 6439701
Filing Date: 2002-08-27
Classification: B41J

Abstract:
A liquid discharge head comprising:a heat generating member for generating thermal energy for generating a bubble in liquid; a discharge port constituting a part for discharging said liquid; a liquid flow path communicating with said discharge port and having a bubble generating area for generating the bubble in said liquid; a movable member provided in said bubble generating area and adapted to displace with the growth of said bubble; and a limiting portion for limiting the displacement of said movable member within a desired range, wherein said liquid discharge head may be adapted to discharge said liquid from said discharge port by the energy at the generation of said bubble by said heat generating member, wherein said limiting portion is provided opposed to said bubble generating area of said liquid flow path, and said movable member, displaced by the growth of said bubble, comes into a substantial contact with said limiting portion to separate the upstream side and the downstream side of said liquid flow path, therein forming a substantially closed state by said movable member and said limiting portion, and at least either of the surfaces of said movable member and said limiting portion is formed as a surface with irregularities, wherein said surface with irregularities is provided at a point where said movable member comes into contact with said limiting portion.