Method for producing organic insulating coating and ink-jet printhead produced according to the method
AssigneeSharp Kabushiki Kaisha
InventorsHaruhiko Deguchi, Shigeaki Kakiwaki, Hirotsugu Matoba, Hirokazu Nakamura, Masaki Matsushita, Tomomi Tanaka
Life of this patent
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Abstract
An organic insulating coating formed on a substrate is composed of two layers of a first parylene coating and a second parylene coating. Heat treatment is performed to at least the first parylene coating after being formed, at a temperature below 125° C. for two hours. Then the second parylene coating is formed on the first parylene coating. Occurrence of pinholes is thus prevented at least in one of the two layers of the organic coatings, with the result that insulating properties of the coatings are improved.
Claims16
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.
An ink-jet printhead comprising:
- one or more ink chambers for providing ink, each of the one or more ink chambers having a base portion, a cover portion, and a pair of opposing side walls;
- a plurality of electrodes provided on at least some portion of each of the pair of opposing side walls of ink chambers;
- a conductive member that is structured and arranged in each of the one or more ink chambers so that each of said one or more ink chambers includes a conductive portion that is isolated from a conductive portion in an adjacent ink chamber;
- and
- a first protective coating provided on a lower portion of pair of opposing side walls;
- a second protective coating provided on an upper portion of pair of opposing side walls;
- wherein
- one or both of the protective coatings is provided with a heat treatment comprising heating one or both of the protective coatings 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 after the coating has been applied.
Dependencies are inferred from the claim text.