FLUID INJECTION DEVICE, DRIVING DEVICE OF FLUID INJECTION DEVICE, DRIVING METHOD OF FLUID INJECTION DEVICE AND OPERATIVE INSTRUMENT

摘要

PROBLEM TO BE SOLVED: To provide a fluid injection device suitable for continuously injecting a pulsation flow in a state of maintaining desired injection force.

SOLUTION: This fluid injection device 1 includes: a fluid chamber 501 changing the volume; a pulsation generating part 100; a fluid injection part 2 having a connecting flow passage 201 communicating one end part with an outlet flow passage 511 and arranging a fluid injection opening part 212 in the other end part, a connecting flow passage pipe 200 for transmitting pulsation to the fluid injection opening part 212, and a pump 20 for supplying fluid; and a driving part 30 for supplying a driving signal to a piezoelectric element 401. The driving part 30 supplies the driving signal of the next one period to a driving signal supply part 30a when determining that this detection voltage Vs becomes voltage V1 or more of indicating that the fluid flowing in a fluid chamber 501 becomes a steady state by an operation control part 30e, by detecting electromotive force of the piezoelectric element 401 by a detecting part 30c, after finishing the expansion from a reduction state by reducing the volume after supplying the driving signal.

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