Method of driving piezoelectric ink jet head

Details Method of driving piezoelectric ink jet head Method of driving piezoelectric ink jet head

2006-08-08

2008-08-19

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Ejector mechanism

C347S010000, C347S011000, C347S012000, C347S013000, C347S057000

Reexamination Certificate

active

07413292

ABSTRACT:
The present invention is directed to a method for driving a piezoelectric ink jet head comprising a piezoelectric actuator AC that includes two piezoelectric ceramic layers7a, 7bhaving such a size that covers the plurality of pressure chambers2, wherein an electric field of opposite sense to the polarizing direction is applied to the second piezoelectric ceramic layer7bby using the common electrodes8a,8band, (1) for the pressure chambers2from which the ink is discharged, an electric field of the same sense as the polarizing direction of the layer is applied to the first piezoelectric ceramic layer7aby using the individual electrode10and the first common electrode8a, thereby causing the region of the piezoelectric actuator AC to deflect toward the pressure chamber2, while (2) for the pressure chambers2from which the ink should not be discharged, an electric field of the opposite sense to the polarizing direction is applied to the first piezoelectric ceramic layer7aby using the electrodes10, 8a, thereby to maintain the region of the piezoelectric actuator AC in the initial state, so as to discharge an ink droplet selectively through the nozzle3that communicates with the pressure chamber2described in (1) and form a dot.

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