Ink jet head for ejecting ink by exerting pressure on ink in ink

Details Ink jet head for ejecting ink by exerting pressure on ink in ink Ink jet head for ejecting ink by exerting pressure on ink in ink

1998-03-26

2000-10-31

Royer, William J.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 92, B41J 2045, B41J 219

Patent

active

061391336

ABSTRACT:
An ink jet head has nozzles and ink channels connected to the nozzles. Side walls of the ink channel are formed from a piezoelectric material, and vary the capacity of the ink channel to eject ink through the nozzle. The ink channels each have a flat bottom surface at a site apart from the site of connection with the nozzle, and the ratio of H2, the depth of the ink channel at the site of connection with the nozzle, to H1, the depth of the ink channel having the flat bottom surface, i.e., the ratio H2/H1, is in the range of from 0.1 to 0.8. The ratio of the distance between the side walls of the ink channel to the height of the side wall of the ink channel at the site of connection with the nozzle is in the range of from 0.5 to 2.0. Thus, air bubbles building up in the ink channel can be easily discharged.

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