Method for driving liquid ejector

Details Method for driving liquid ejector Method for driving liquid ejector

2011-03-01

2011-03-01

Le, Uyen-Chau N (Department: 2874)

Incremental printing of symbolic information

Ink jet

Controller

C347S009000, C347S011000, C347S068000, C347S070000, C347S072000, C310S324000, C310S342000, C310S358000

Reexamination Certificate

active

07896456

ABSTRACT:
A method for driving a liquid drop ejector (1) equipped with a piezoelectric actuator (7) including a piezoelectric ceramic layer (6) having a size covering a plurality of pressurizing chambers (2). An arbitrary piezoelectric deformation region (8) of the liquid drop ejector (1) is deflected in one thickness direction and the opposite direction, respectively, by applying a driving voltage waveform including a first voltage (−VL) and an equivalent second voltage (+VL) of the opposite polarity in order to vary the volume of the pressurizing chambers (2) of a corresponding liquid drop ejecting portion (4), and a liquid drop is ejected through a communicating nozzle (3). Since gradual creep deformation of the inactive region (16) of the piezoelectric ceramic layer (6) is prevented, the ink drop ejection performance is maintained at a good level over a long term.

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