| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fluid ejection device for ejecting a strong pulse flow. <P>SOLUTION: In a method for driving the fluid ejection device 1, the fluid ejection device 1 is equipped with a piezoelectric element 30 and a diaphragm 40 both of which change the volume of a pressure chamber 80 as a volume altering means, the outlet flow channel 82 opened in the volume changing direction of the pressure chamber 80 and the fluid ejection opening part 96 allowed to communicate with the outlet flow channel 82 and constituted so as to change the volume of the pressure chamber 80 by the piezoelectric element 30 and the diaphragm 40 to eject a liquid in a pulse-like state from the fluid ejection opening part 96. In the case that the cycle of the volume change of the pressure chamber 80 is set to T, the distance from the fluid ejection opening part 96 to the surface on the side of the pressure chamber 80 of the diaphragm 40 is set to D and the sonic velocity in the water of the section of the distance D is set to Q, the piezoelectric element 30 is driven so that the cycle T, the distance D and the sonic velocity Q satisfy T=n×2D/Q (wherein n is a positive integer). As a result, a pressure wave becomes resonance relation with respect to the drive frequency of the piezoelectric element 30 and the strong pulse flow can be ejected. <P>COPYRIGHT: (C)2011,JPO&INPIT |
