Liquid ejector which uses a high-order ultrasonic wave to eject

Details Liquid ejector which uses a high-order ultrasonic wave to eject Liquid ejector which uses a high-order ultrasonic wave to eject

1997-10-28

2000-12-05

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 2135

Patent

active

061556718

ABSTRACT:
The particle diameter of droplets is controlled without improvements on a nozzle plate. An ultrasonic wave causes a radiation pressure to be intermittently applied to an opening in a cycle having a period shorter than the fundamental vibration period of a liquid surface in the opening. A high-order standing wave is then generated at the liquid surface in the opening to cause a plurality of droplets to be emitted simultaneously. Since the plurality of droplets are simultaneously emitted from a plurality of mounds of the high-order standing wave, the droplets have a diameter smaller than the diameter of the opening and are emitted vertically upwardly. The diameter of the droplets is controlled by the order of the high-order standing wave to be generated. The order of the standing wave is increased by shortening the period for which the radiation pressure is applied to the opening.

REFERENCES:
patent: 4380547 (1983-04-01), Materne
patent: 5808636 (1998-09-01), Stearns
patent: 5821958 (1998-10-01), Lim
patent: 5912679 (1999-06-01), Takayama et al.
patent: 5917521 (1999-06-01), Haga et al.
patent: 5953027 (1999-09-01), Suwabe et al.
S.A. Elrod et al, Nozzleless Droplet Formation With Focused Acoustic Beams, Xerox Palo Alto Research Center, 333 Coyote Hill Rd. Palo Alto, California 94304, (Received Nov. 7, 1988; accepted for publication Jan. 4, 1989), pp. 3441-3447.
Abstract of Japanese patent Laid-Open Gazette No. 2-303849: "Ink Jet Head".
K.A. Krause, "Focusing Ink Jet Head", IBM Technical Disclosure Bulletin, Vol. 16, No. 4, 1973, p. 1168.

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