| 摘要 |
PURPOSE: A piezo-electric actuator of an ink-jet print head is provided to protect an upper electrode to always maintain stable applying an electric current to a crack generated in a piezo-electric material and maintain stable printing working, thereby improving the yield and the reliability of products. CONSTITUTION: In a piezo-electric actuator forming a vibrating plate(20) on the top of chamber plates(10), and a lower electrode(30), a piezo-electric material, and an upper electrode(50) accumulated on the top of the vibrating plate by patterning in turns, the piezo-electric actuator of an ink-jet print head includes an auxiliary electrode(60) integrately mounted on the top of the upper electrode, wherein the auxiliary electrode is thicker than the upper electrode while has smaller flat section than the upper electrode.
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