Patent ID: 6341847
Filing Date: 2002-01-29
Classification: B41J

Abstract:
An ink jet head comprising:a diaphragm substrate having a diaphragm provided therein and arranged such that said diaphragm defines a portion of a bottom surface of said diaphragm substrate; and an electrode substrate having an electrode provided therein and being attached to said diaphragm substrate so that said electrode faces said diaphragm of said diaphragm substrate, said electrode substrate having a depression therein, said depression arranged such that said electrode defines a bottom portion of said depression and a gap between said diaphragm and said electrode is defined by a depth of said depression; wherein said depression is formed by selectively oxidizing an inner portion of said electrode substrate in an oxidizing area to form an oxidation layer, and removing substantially all of said oxidation layer to form said depression, such that said gap extends into said inner portion of said electrode substrate, and wherein said substrate is substantially free of said oxidation layer adjacent said gap.