Patent ID: 8148049

Claim:
A manufacturing method of an ink jet recording head comprising: providing a mold material of a positive resin having a shape of an ink flow path for communication with an ink discharge port for use in discharging ink; providing a coating resin layer of a negative photosensitive resin on the mold material so as to coat a top surface of the mold material and a side surface of the mold material; exposing a portion of a region of the coating resin layer positioned above the mold material and a region of the coating resin layer other than the region of the coating resin layer positioned above the mold material; removing a non-exposure portion of the region of the coating resin layer positioned above the mold material to form the ink discharge port in the non-exposure portion of the region of the coating resin layer positioned above the mold material; and removing the mold material to form the ink flow path, wherein during the exposing of the coating resin layer, a total amount of exposure energy per unit area applied to the region other than the region of the coating resin layer positioned above the mold material is greater than that of exposure energy per unit area applied to the region of the coating resin layer positioned above the mold material.