Patent ID: 6978543

Claim:
A method of manufacturing an ink jet head having a plurality of nozzles ( 120 ) for discharging ink supplied from an ink supply part ( 50 ), characterized in that comprising: a step of forming, on a substrate ( 122 ), a head main body ( 3 ) including a plurality of pressure chambers ( 112 ) provided one for each of said nozzles ( 120 ) and filled up with ink, a plurality of pressurizers ( 140 ) provided one for each of said pressure chambers ( 112 ) for pressurizing said pressure chamber ( 112 ) to discharge said ink in said pressure chamber ( 112 ) from said nozzle ( 120 ) and a common ink passage ( 110 ) for supplying said ink from said ink supply part ( 50 ) to said plurality of pressure chambers ( 112 ); and a step of removing said substrate ( 122 ) partially from said head main body ( 3 ) to form, in said substrate ( 122 ), a communicating passage ( 81 ) for making a communication between said common ink passage ( 110 ) and an ink supply port ( 51 ) of said ink supply part ( 50 ) and of forming a residual portion of said substrate ( 122 ) on said head main body ( 3 ) as a joint portion for joining said ink supply part ( 50 ) to said head main body ( 3 ).