Liquid-droplet jetting apparatus and liquid-droplet jetting...

Incremental printing of symbolic information – Ink jet – Ejector mechanism

Reexamination Certificate

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C347S068000

Reexamination Certificate

active

08038265

ABSTRACT:
An ink-jet head includes a piezoelectric layer, pressure chambers, nozzles, first electrodes, and second electrodes. When electric potentials of the first and second electrodes respectively are changed at the same timing such that increase and decrease in the electric potentials are opposite between the first and second electrodes, volume of the pressure chamber is changed to apply jetting-pressure to ink in the pressure chamber, thereby jetting an ink droplet from the nozzle. When only the electric potential of the second electrode is changed, the volume of the pressure chamber is changed to apply a vibrating-pressure lower than the jetting-pressure to the ink in the pressure chamber, thereby vibrating meniscus of the ink, agitating the ink in the nozzle. This makes it possible to suppress increase in viscosity of the ink in the nozzle.

REFERENCES:
patent: 5742412 (1998-04-01), Minemoto et al.
patent: 6450626 (2002-09-01), Ikeda et al.
patent: 2005/0270340 (2005-12-01), Mita
patent: 11309858 (1999-11-01), None
patent: 2001105613 (2001-04-01), None
patent: 2004106215 (2005-04-01), None

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