Patent ID: 7066582

Claim:
An ink-jet printhead comprising: electrodes provided on at least part of interior walls of ink chambers, at least part of the ink chambers made of a piezoelectric material; and a protective coating for coating the surfaces of the electrodes, the protective coating formed by: a first coating step of forming a first organic coating on the interior walls of the ink chambers provided with the electrodes; a second coating step of forming a second organic coating on the first organic coating; and at least either one of: a first heat treatment step of treating the first organic coating with heat after the first coating step; and a second heat treatment step of treating the second organic coating with heat after the second coating step, wherein at least one of the first heat treatment step and the second heat treatment step comprises heating said first or second organic coating for a period of time at a temperature that is greater than a glass transition temperature of said first or second organic coating and less than a melting point of said first or second organic coating.