Method for driving piezoelectric ink jet head

Details Method for driving piezoelectric ink jet head Method for driving piezoelectric ink jet head

2008-05-13

2008-05-13

Luu, Matthew (Department: 2861)

Incremental printing of symbolic information

Ink jet

Controller

C347S070000

Reexamination Certificate

active

11462326

ABSTRACT:
The present invention provides a method for driving a piezoelectric ink jet head that surely suppresses the ensuing vibration of the drive section while suppressing the flying speed of the ink droplet from decreasing, by setting the time constant τUPof rise of voltage when the drive voltage is applied and/or the time constant τDNof fall of voltage when stopping the application of the drive voltage are set in ranges that satisfy the relations of the expressions (i) and (ii):in-line-formulae description="In-line Formulae" end="lead"?Ta/(−ln 0.01)≦τUP≦Ta/(−ln 0.25)   (i)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?Ta/(−ln 0.01)≦τDN≦Ta/(−ln 0.25)   (ii)in-line-formulae description="In-line Formulae" end="tail"?with respect to the period Ta of the ensuing vibration of the drive section, or pulse width T3of the drive voltage is set at an integral multiple of the period Ta of the ensuing vibration of the drive section.

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