PROBLEM TO BE SOLVED: To provide a fluid ejection device capable of performing highly efficient fluid ejection.SOLUTION: This fluid ejection device 10 includes: a pressure chamber 10 an actuator 70 having a displacement plane 71 that varies the volume of the pressure chamber 60 a delivery channel pipe 51 communicating with the pressure chamber 60 a first reflection surface M1 of pressure wave formed as part of a paraboloid of revolution that reflects a plane pressure wave by displacement of the actuator 70, the plane pressure wave propagating through the pressure chamber 60 and a second reflection surface M2 of pressure wave formed as part of a paraboloid of revolution which is disposed so as to face the first reflection surface M1 of pressure wave, wherein the first reflection surface M1 of pressure wave and the second reflection surface 2 of pressure wave have a common first focus F1, and a pressure wave reflected from the second reflection surface M2 of pressure wave propagates through the delivery channel pipe 51 and ejects fluid. Consequently, the pressure wave is highly efficiently transmitted to the interior of the delivery channel pipe 51 such that energy provided in the pressure wave that is generated by the actuator 70 can be highly efficiently used for the fluid injection.COPYRIGHT: (C)2012,JPO&INPIT【課題】高効率の流体噴射が可能な流体噴射装置を実現する。【解決手段】流体噴射装置10は、圧力室60と、圧力室60の容積を変化させる変位平面71を有するアクチュエーター70と、圧力室60と連通する送出流路管51と、アクチュエーター70の変位により圧力室60の内部を伝播する平面圧力波を反射させる回転放物面の一部からなる第1圧力波反射面M1と、第1圧力波反射面M1に対向配置される回転放物面の一部からなる第2圧力波反射面M2と、を備え、第1圧力波反射面M1と第2圧力波反射面M2とが共通の第1焦点F1を有し、第2圧力波反射面M2から反射される圧力波が、送出流路管51の内部に伝播して流体を噴射させる。このことによって、圧力波を効率よく送出流路管51内に伝達させ、アクチュエーター70が生み出す圧力波が持つエネルギーを高効率で流体噴射に利用することができる。【選択図】図3
