Ink-jet spraying device and method using ultrasonic waves

摘要

An ink-jet spraying device includes an ink chamber for holding ink corresponding to an opening in a nozzle plate; an ultrasonic vibration plate which vibrates in order to separate pigment particles in the ink; a mesh grid for electrically charging the separated pigment particles, with a voltage applied; and an electric field formation circuit for spraying the electrically charged pigment particles through the nozzle openings in accordance with a print command. The separated pigment particles acquire an electric polarity while passing through the mesh grid, since the voltage applied to the mesh grid is greater or equal to that of the formed electric field. The electric field formation circuit includes: a common electrode installed under the ink chamber; and individual electrodes disposed above the ink chamber.