| 摘要 |
PURPOSE:To realize a small-size against multi-nozzle structure, a low production cost, and an enhanced electro-mechanical conversion efficiency, by a method wherein in a cross section of a piezoelectric element, the length in the predetermined direction is made different from that at right angles thereto and electrodes are provided only on the outer surfaces. CONSTITUTION:A positive pulse voltage generated in a pulse generator 2 is applied through a connection wire 6 to electrodes 12 on the upper and lower surfaces of a piezoelectric element 11. Being applied with the voltage through the electrodes 12, the piezoelectric element 11 is maintained in its axial length (1) but compressed only in its vertical length, thus elongating the horizontal length. Therefore, an electro-mechanical conversion efficiency is enhanced, and furthermore, the piezoelectric element 11 has not cylindrical outer shape but a horizontal length shorter than a vertical length. As a result, in a multi- nozzle consisting of a plurality of piezoelectric elements, a pitch P2 in the each piezoelectric element 11 is made remarkably shorter than a pitch P1 in a conventional circular piezoelectric element. In this manner, a nozzle portion 7 has a shorter total width in a parallel direction, thus forming a small-size nozzle. |
