Method for manufacturing an ink jet head, and an ink jet head

An ink jet head comprising:

• plural discharge ports for discharging ink,
• a substrate having energy generating elements arranged thereon to generate energy for discharging ink from the discharge ports;
• and
• a wall formation material having a height of 100 .mu.m or less connected to said substrate having recesses arranged to form the walls of an ink passage, said ink passage including a plurality of nozzle portions communicating with said plural discharge ports, respectively, and a common ink chamber commonly communicating with said plurality of nozzle portions, wherein edge recesses different from said recesses are further arranged in s aid wall formation material,
• wherein said recesses in said wall formation material are formed by a passage molding material and said edge recesses are formed by an edge portion molding material in a vicinity of said passage molding material corresponding to said common ink chamber, and said wall formation material has a difference in height according to location of said ink passage and said edge recesses.

An ink jet head comprising:

• plural discharge ports for discharging ink;
• a substrate having energy-generating elements arranged thereon to generate energy for discharging ink from the discharge ports;
• and
• a wall formation material having a height of 100 .mu.m of less connected to said substrate having recesses arranged to form the walls of an ink passage, said ink passage including a plurality of nozzle portions communicating with said plural discharge ports, respectively, and a common ink chamber commonly communicating with said plurality of nozzle portions, wherein edge recesses different from said recesses are further arranged in said wall formation material,
• wherein said edge recesses are in a vicinity of said common ink chamber, and said wall formation material has a difference in height according to location of said ink passage and said edge recesses.