Ink jet recording head and method of manufacturing the same

A method of manufacturing an ink jet recording head having a plurality of energy generating elements for generating energy for discharging ink, a plurality of discharge ports provided at locations opposed to respective ones of said energy generating elements, a plurality of ink flow paths communicating with respective ones of said discharge ports, and an ink supplying port for supplying the ink to said plurality of ink flow paths, said method having:

• the step of forming said energy generating elements on a surface of a substrate formed with said ink supplying port;
• the step of covering said surface of said substrate with positive type or negative type photosensitive resin;
• the step of patterning a portion of the covering photosensitive resin by a photolithography method to thereby form a protruding portion at a location corresponding to the upstream side of said discharge ports with respect to an ink flow direction in which the ink flows from said ink supplying port into said ink flow paths and is discharged from said discharge ports;
• the step of effecting a water repelling process on said protruding portion;
• the step of positioning on said substrate a nozzle plate formed with grooves constituting said ink flow paths and said discharge ports between it and said substrate, and having an adhesive layer on the joined surface thereof with said substrate;
• and
• the step of urging said nozzle plate against said substrate and at the same time, heating the joined region of the two to thereby adhesively securing said adhesive layer to said substrate.