| 摘要 |
PROBLEM TO BE SOLVED: To provide an inkjet head which is small and thin and excellent in productivity wherein piezoelectric elements capable of exhibiting a large displacement quantity and a high displacement generating force can be arranged with ink chambers and nozzles in high concentration and the generation of cross-talk is suppressed. SOLUTION: An ejection device 1 comprises a flow passage section 12, which defines a plurality of flow passages having an introduction hole 61, a compression chamber 3 and an ejection hole 62, and an actuator section 11 having a top plate 71, a pair of support walls 72 provided to the opposite ends of the top plate 71 and a plurality of piezoelectric elements 4 suspended from the top plate 71, mutually individually provided in parallel with each other bridging the support walls 72 and in pairs with the flow passages. The ejection device 1 keeps the actuator section 11 and the flow passage section 12 integrated with each other so that the tip end surface of the piezoelectric element 4 may be abutted on the ceiling wall 7 of the compression chamber 3, wherein the displacement of the piezoelectric element 4 bends the ceiling wall 7 to displace the volume of the compression chamber 3 to pressurize the fluid, causing the fluid to be discharged from the ejection holes 62. COPYRIGHT: (C)2007,JPO&INPIT
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