| 摘要 |
PROBLEM TO BE SOLVED: To provide a nozzle capable of stably amplifying a micro-oscillation of a piezoelectric body exciting an ink and preventing a fluid resonance being unstable with temperature from occurring. SOLUTION: In order to amplify oscillation of the piezoelectric body 29 fitted on a body 30, the length of the body 30 is determined so that the resonance frequency f<SB>b</SB>of an oscillation in the axial direction of the body is close to the driving frequency f<SB>n</SB>of the nozzle, to amplify the oscillation by a mechanical resonance of the body 30. In addition, ink flow paths 37, 38 and 39 formed in the body 30 are respectively made into structures with steps with different inner diameters, so that the resonance frequencies of the fluid generated in the ink flow paths are made to be separated by≥20 kHz from the driving frequency of the nozzle. COPYRIGHT: (C)2005,JPO&NCIPI
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