| 摘要 |
PROBLEM TO BE SOLVED: To provide a fluid injection device suitable for injecting continuously a pulsation flow under a state in which a desired injection force is kept.SOLUTION: A fluid injection device 1 comprises: a fluid chamber 501 of which volume can be changed; an inlet passage 503 and an outlet passage 511 communicated with the fluid chamber 501; a pulsation flow generating part 100 including a piezoelectric element 401; a connecting passage 201 communicated at one end with the outlet passage 511 and provided with, at the other end, a fluid injection opening 212; a connected passage pipe 200 for transmitting the pulsation flow from the fluid chamber 501 to the fluid injection opening 212; a fluid injection part 2 having a pump 20 for supplying fluid; and a driving part 30 for supplying a driving signal to the piezoelectric element 401. The driving part 30 controls a supplied content of the driving signal constituted by a signal waveform including a compression driving waveform part for driving the piezoelectric element 401 so as to compress the volume in such a way that a fluid flowing toward the fluid chamber 501 before supplying each of the compression driving waveforms supplied continuously may return back to its normal state. |
