PROBLEM TO BE SOLVED: To provide a fluid injection device that discharges fluid efficiently and smoothly.SOLUTION: The fluid injection device 1 includes: a compression chamber 40 a cylindrical laminated piezoelectric element 10 divided into a peripheral direction and having inner electrodes 11a to 11f arranged in a rotational direction a diaphragm 30 closely fixed on the end surface of the compression chamber 40 of the laminated piezoelectric element 10 and an outlet hole 60 with the compression chamber 40 opened at a position facing a final inner electrode when using one of the inner electrodes 11a as a beginning inner electrode and also using the inner electrode 11f arranged right before the beginning inner electrode in the rotational direction as the final inner electrode. In the laminated piezoelectric element 10, each of the regions where the inner electrodes are formed is independently and sequentially displaced with time differences from the beginning inner electrode toward the final inner electrode, and the volume of the compression chamber 40 is reduced sequentially by means of the diaphragm 30 from the region where the beginning inner electrode is formed toward the region where the final inner electrode is formed, increasing the pressure in the compression chamber 40 to discharge the fluid from the outlet hole 60.COPYRIGHT: (C)2012,JPO&INPIT【課題】効率よくスムーズに流体を排出することができる流体噴射装置を実現する。【解決手段】流体噴射装置1は、圧力室40と、周方向に分割され、回転方向に配列される内部電極11a~11fを有する円柱形状の積層型圧電素子10と、積層型圧電素子10の圧力室40側の端面に密着固定されるダイアフラム30と、内部電極11aの一つを始点内部電極とし、始点内部電極の回転方向の一つ前に配設される内部電極11fを終点内部電極としたとき、終点内部電極と対向する位置で圧力室40を開口する出口孔60と、を有し、積層型圧電素子10を、始点内部電極から終点内部電極に向かって内部電極の形成領域の一つ一つを独立して時間差を有して順々に変位させ、圧力室40の容積をダイアフラム30により始点内部電極の形成領域から終点内部電極の形成領域に向かって順々に縮小していき、圧力室40内の圧力を高め、出口孔60から流体を送出する。【選択図】図7
