Head drive device of inkjet printer and ink jet printer
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United States of America Patent
Stats
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Apr 30, 2013
Grant Date -
Mar 12, 2009
app pub date -
Jan 17, 2007
filing date -
Jan 17, 2006
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A head drive apparatus of an inkjet printer includes nozzles and corresponding actuators that eject liquid drops. A drive unit applies a drive signal to the actuators. The drive unit includes a drive waveform generator that generates a drive waveform signal as a reference of a signal to control drive of the actuators. A modulator pulse modulates a drive waveform signal generated by the drive waveform generator. A digital power amplifier amplifies power of a modulated signal subjected to the pulse modulation. A low pass filter smoothes an amplified digital signal subjected to the power amplification by the digital power amplifier and supplying the signal as a drive signal to the actuators. An inverse filter provided in a subsequent stage of the drive waveform generator corrects at least the frequency characteristics of the filter to predetermined frequency characteristics, independently of the number of the actuators to drive.
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