Method for manufacturing ink jet recording head

A method for manufacturing an ink jet recording head comprising a discharging orifice for discharging ink located in a discharge opening face, a discharge pressure generating element for generating energy for ink discharge, an ink flow path communicating with the discharging orifice and a liquid chamber communicating with the ink flow path, such that the liquid chamber is provided at the other end of the ink flow path than an end of the ink flow path at which the ink flow path communicates with the discharging orifice, said method comprising:

• a step of preparing a first substrate provided with the discharge pressure generating element,
• a step of forming a removable pattern material for forming the ink flow path on the first substrate, the removable pattern material forming a pattern in which at least two ink jet recording heads are contiguous in opposition to each other on the side of the ink flow path thereof,
• a step of preparing a second substrate provided with an ink feed opening for feeding ink to the ink flow path,
• a step of fixing the first substrate and the second substrate with the interposition of a predetermined space via the pattern material,
• a step of injecting a resin for forming an ink flow path wall into a space between the first substrate and the second substrate,
• a step of curing the resin,
• a step of simultaneously cutting the first substrate, the second substrate and the cured resin to divide them into individual ink jet recording heads, and
• a step of removing the pattern material to form the ink flow path,
• wherein an injection opening is provided in the vicinity of the continuous portion of the pattern of the removable pattern material of the first substrate, and the resin is injected through the injection opening toward the liquid chamber side of the ink flow path, and the injection opening is a through-hole for resin injection that is formed through the first substrate after the pattern material is formed on the first substrate.

A method for manufacturing an ink jet recording head comprising a discharging orifice for discharging ink located in a discharge opening face, a discharge pressure generating element for generating energy for ink discharge, an ink flow path communicating with the discharging orifice and a liquid chamber communicating with the ink flow path, such that the liquid chamber is provided at an other end of the ink flow path than an end of the ink flow path at which the ink flow path communicates with the discharging orifice, said method comprising the steps of:

• preparing a first substrate;
• forming a plurality of discharge pressure generating elements for constituting at least two ink jet recording heads on the first substrate and a removal pattern material covering the discharge pressure generating elements for forming the ink flow path and the liquid chamber such that the two ink jet recording heads are contiguous in opposition to each other on the side of the discharging orifice;
• preparing a second substrate having a plurality of ink feed openings for feeding ink to the liquid chamber;
• fixing the first substrate and the second substrate with the interposition of the removal pattern material to form a predetermined continuous space between the first substrate and the second substrate through the two ink jet recording heads;
• injecting a resin into the space and curing the resin to form an ink flow wall;
• cutting a stack comprising the first substrate, the second substrate and the ink flow wall at a boundary portion of the two ink jet recording heads to divide the two ink jet recording heads into individual ink jet recording heads;
• and
• removing the removal pattern material to form the ink flow path and form the discharging orifice at the cutting face side end portion of the ink flow path,
• wherein the first substrate or the second substrate has an injection opening communicating with the space at the boundary portion of the two ink jet recording heads, and wherein the injecting of the resin into the space is carried out from the injection opening in a direction of the liquid chamber of each ink jet recording head.