Inkjet printhead and image forming apparatus including the same
AssigneeSamsung Electronics Co., Ltd.
InventorsMyong-jong Kwon, Young-ung Ha, Sung-joon Park, Kyong-il Kim
Life of this patent
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Abstract
Thermal inkjet printheads and an inkjet image forming apparatus including the thermal inkjet printheads. Each of the thermal inkjet printheads includes a heater that heats ink by directly contacting the ink and is formed of an alloy of Pt—Ru or an alloy of Pt—Ir—X, where X is at least a material selected from the group consisting of Ta, W, Cr, Al, and O.
Claims28
An inkjet printhead comprising:
- a substrate;
- a heater formed on the substrate;
- an electrode formed on the heater to apply a current to the heater;
- a chamber layer which is stacked on an upper part of the substrate on which the heater and the electrode are formed and comprises an ink chamber which stores an ink to be ejected and is formed above a heat generation part of the heater;
- and
- a nozzle layer which is stacked on an upper part of the chamber layer and comprises a plurality of nozzles through which the ink is ejected,
- wherein the heat generation part directly contacts the ink in the ink chamber and the heater is formed of one of an alloy of Pt—Ru, where the composition percentage of Ru is about 20% to about 80%, and an alloy of Pt—Ir, where Pt and Ir have the same composition percentage, and a material X.
An inkjet image forming apparatus comprising:
- thermal inkjet printheads that eject ink through a plurality of nozzles by heating a heater, wherein the heater contacts the ink and is formed of one of an alloy of Pt—Ru, where the composition percentage of Ru is about 20% to about 80%, and an alloy of Pt—Ir, where Pt and r have about the same composition percentage, and an impurity X.
An inkjet image forming apparatus comprising:
- a plurality of thermal inkjet printheads that eject ink through a plurality of nozzles by applying a heat to the ink with a plurality of heaters, wherein the heater directly contacts the ink and is formed of one of an alloy of Pt—Ru, where the composition percentage of Ru is about 20% to 80%. and an alloy of Pt—Ir, where Pt and Ir have about the same composition percentage, and an impurity X.
A thermal inkjet printhead, comprising:
- a substrate;
- a heater formed above the substrate and including an alloy of one of Pt—Ru, where the composition percentage of Ru is about 20% to about 80%, and Pt—lr, where Pt and Ir have about the same composition percentage, and an impurity X;
- an electrode formed above portions of the heater to expose a heat generating portion of the heater;
- and
- an ink chamber, formed above the electrode and the heater to contain ink therein such that the contained ink contacts the heat generating portion of the heater.
A heating element usable in an inkjet printhead, the heating element comprising an alloy of one of Pt—Ru, where the composition percentage of Ru is about 20% to about 80%, and Pt—Ir, where Pt and k have about the same composition percentage, and an impurity X.
Dependencies are inferred from the claim text.