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 having inner electrodes divided into two or more arbitrary integers in a radial direction a diaphragm 30 closely fixed on 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 the inner electrode 11c on the innermost side. 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 outside toward the inside, and the volume of the compression chamber 40 is reduced sequentially by means of the diaphragm 30 from the outside toward the inside, so that the fluid is discharged from the outlet hole 60, the fluid being ejected at a high speed from a liquid ejection opening in a pulse state.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、径方向に二以上の任意の整数に分割された内部電極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側に密着固定されるダイアフラム30と、最も内側にある内部電極11cと対向する位置に前記圧力室40を開口する出口孔60と、を有し、積層型圧電素子10を、内部電極の形成領域の一つ一つを独立して外側から内側方向に向かっ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により外側から内側に向かって順々に縮小していき、出口孔60から流体を送出し、流体噴射開口部からパルス状に高速噴射する。【選択図】図6
