APPARATUS FOR PRODUCING INK PARTICLE

摘要

PURPOSE:To stabilize the generation of ink particles by setting the ratio L/phi between the diameter phi of a nozzle hole and the axial length L thereof at 0.7 or more in an ink particle generator designed to generate F pieces of ink particles per sec employing a fundamental frequency F and an excitation voltage containing a double higher harmonic. CONSTITUTION:An electric-mechanical conversion element 4 is excited by an excitation voltage source 5 adapted to generate an excitation voltage Ve receiving input signals of frequency F and 2F respectively from first and second oscillators 12 and 13, F pieces per sec of ink particles are generated from an ink column injected through a nozzle hole 7 of an orifice plate 3 on a nozzle 1. The generation of the ink particles relates to the frequency component of the excitation voltage Ve and a difference in the phase between the frequencies F and 2F. There is the center phase difference thetac where ink particles are generated most stably. The center phase difference thetac depends on the ratio between the average diameter phi of the nozzle hole 7 and the length L thereof. Where L/phi=0.7 or more, thetac=60 deg..