초록 ▼

In an ink jet printing apparatus an ultrasonic transducer is an elongated cylindrical assembly submerged in the ink which is held under pressure in an ink chamber. To provide an array of ink jet filaments having uniform length and uniform drop formation, the acoustic energy of the transducer is focu

In an ink jet printing apparatus an ultrasonic transducer is an elongated cylindrical assembly submerged in the ink which is held under pressure in an ink chamber. To provide an array of ink jet filaments having uniform length and uniform drop formation, the acoustic energy of the transducer is focused by the internal wall of the ink chamber toward an ink jet array on an orifice plate. The said invention also generates ink droplets from all jets at the same phase－which simplifies the driving electronics of the array for high resolution printing. In one embodiment the internal chamber wall, in cross-section, is a sector of an ellipse and in another embodiment it is a parabola.

대표청구항 ▼

An ink jet array apparatus for the generation of a plurality of continuous streams of ink drops comprising: an elongated ink chamber having means connecting the chamber to a source of ink under pressure; an ink jet orifice plate connected to said chamber as one of the walls of the chamber and having

An ink jet array apparatus for the generation of a plurality of continuous streams of ink drops comprising: an elongated ink chamber having means connecting the chamber to a source of ink under pressure; an ink jet orifice plate connected to said chamber as one of the walls of the chamber and having a plurality of orifices to form an array of ink jet filaments; and an elongated electro-acoustic transducer means within said chamber to convert electrical energy into perturbations of the ink; wherein the inner walls of the chamber, in cross-section, are sectors of an ellipse, the transducer means is positioned at one focus of said ellipse and the orifices are positioned at the other focus of the said ellipse.