Patent ID: 6908563

Claim:
A method for manufacturing an ink-jet head in which ink-discharge-pressure generation elements are provided on a substrate, discharge ports are disposed in a plate facing the ink-discharge-pressure generation elements, and ink is discharged from the discharge ports by generating bubbles within ink, said method comprising the steps of: forming a threaded port, serving as an ink supply port, in a ceramic substrate; filling the threaded port with a filler by melting the filler; flattening a portion of the threaded port filled with the filler in the substrate; depositing a silicon nitride film on a surface of the substrate in which the portion of the threaded port is flattened; depositing a layer made of a high-heat-conduction material on the silicon nitride film; forming the ink-discharge-pressure generation elements on the high-heat-conduction layer; forming ink discharge portions having the corresponding discharge ports on the substrate having the ink-discharge-pressure generation elements; and removing the filler from the substrate having the ink discharge portions.