Liquid discharge head, cartridge having such head, liquid discharge apparatus provided with such cartridge, and method for manufacturing liquid discharge heads

A method for manufacturing an ink jet head comprising the steps of:

• preparing a head substrate provided with a plurality of ink paths and ink discharging means each arranged for each of said paths;
• preparing an orifice plate provided with ink discharge openings communicated with each of said ink paths and bonded to said head substrate, said orifice plate comprising a water-repellent material and having a bonding surface side for bonding to said head substrate;
• performing a surface treatment or modification on the bonding surface side of said orifice plate;
• and
• self-bonding said orifice plate to said head substrate.

An ink jet head comprising:

• a head substrate having a fluororesin coating on a bonding surface thereof, said head substrate provided with a plurality of ink paths and pressure generating elements each arranged for each of said paths;
• and
• an orifice plate including a resin containing fluorine, said orifice plate provided with ink discharge openings each communicated with each of said ink paths, and said orifice plate having a bonding surface, wherein said orifice bonding surface and said head substrate bonding surface are provided at least with a surface treatment,
• wherein the surface treatment is a plasma treatment to self-bond said orifice plate and said substrate.

A method for manufacturing ink jet heads comprising the steps of:

• preparing a head substrate having a fluororesin coating on a bonding surface thereof, said head substrate provided with a plurality of ink paths and pressure generating elements each arranged for each of said paths;
• preparing an orifice plate including a resin containing fluorine, said orifice plate provided with ink discharge openings communicated with each of said ink paths and bonded to said head substrate;
• performing a plasma surface treatment on the bonding surface side of said orifice plate to said substrate and the bonding surface of the head substrate;
• and
• self-bonding said orifice plate to said substrate.

A method for manufacturing ink jet heads comprising the steps of:

• preparing a head substrate provided with a plurality of ink paths and pressure generating elements each arranged for each of said paths;
• preparing an orifice plate including a resin containing fluorine, said orifice plate provided with ink discharge openings communicated with each of said ink paths and bonded to said head substrate;
• and
• performing a laser irradiation surface treatment on the bonding surface side of said orifice plate to said substrate and on a bonding surface of said head substrate to activate the resin containing fluorine in the bonding surface of said orifice plate;
• and
• bonding said orifice plate and said head substrate.

A method for manufacturing ink jet heads comprising the steps of:

• preparing a head substrate comprising a substrate and a ceiling plate for the substrate, said head substrate provided with a plurality of ink paths and pressure generating elements each arranged for each of said paths;
• preparing an orifice plate provided with ink discharge openings communicated with each of said ink paths and bonded to a front end of said head substrate;
• immersing the orifice plate, the substrate and the ceiling plate into water containing fluororesin;
• plasma treating (i) a front end of the head substrate and (ii) the orifice plate;
• irradiating the front end of the head substrate and the orifice plate with UV rays;
• and
• bonding the orifice plate, the substrate, and the ceiling plate under pressure.