Liquid discharge head, head cartridge and liquid discharge apparatus

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 irregularities have a comb-tooth shape.

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 irregularities have a comb-tooth shape,
• wherein said irregularities of comb-tooth shape are constituted by forming plural grooves, extending along the direction of said liquid flow path, on a surface to be provided with said irregularities.

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 irregularities have a comb-tooth shape,
• wherein said irregularities of comb-tooth shape are constituted by forming plural grooves, extending along the direction of said liquid flow path, on a surface to be provided with said irregularities,
• wherein said plural grooves have a same length and are arranged in a zigzag manner in a direction perpendicular to the liquid flow path in such a manner that the two neighboring grooves have mutually different longitudinal positions.

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 irregularities are constituted by forming island-shaped projections on a surface to be provided with said irregularities.

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 a recessed portion of said irregularities is constituted by a hole, of which an aperture end is formed on a surface different from the surface having said irregularities.

A liquid discharge head comprising:

• a heat generating member for generating thermal energy for generating a bubble in liquid,
• a discharge port constituting a portion for discharging said liquid,
• a liquid flow path communicating with said discharge port and including a bubble generating area for generating said 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, the liquid discharge head being adapted for discharging 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 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 provided with a first exhaustion accelerating structure for exhausting said liquid, present in an area between said movable member and said limiting portion prior to the contact of said movable member and said limiting portion, to the exterior of such area.