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1. A pulse generator that generates a driving pulse applied to electrodes of an inkjet head in which the electrodes are respectively disposed on wall surfaces of a plurality of ink chambers provided side by side while being partitioned by partition walls made of a piezoelectric material, a potential difference is applied to the electrodes of adjacent two ink chambers to deform the partition wall sandwiched by the electrodes, and ink is ejected from a nozzle communicating with the ink chamber including the deformed partition wall as the wall surface, the pulse generator comprising:
an ejection relevant waveform setting register configured to store setting data of an ejection relevant driving pulse applied to the electrode of the ink chamber communicating with, among the nozzles, an ejection relevant nozzle that ejects the ink; an ejection both-side waveform setting register configured to store setting data of an ejection both-side driving pulse applied to the electrodes of the ink chambers communicating with, among the nozzles, ejection both-side nozzles arranged on both sides of the ejection relevant nozzle; a first high impedance setting register provided to correspond to the ejection relevant waveform setting register and configured to store setting data for setting the electrode applied with the ejection relevant driving pulse to a high impedance state for a predetermined period; a second high impedance setting register provided to correspond to the ejection both-side waveform setting register and configured to store setting data for setting the electrodes applied with the ejection both-side driving pulse to the high impedance state for the predetermined period; a waveform forming unit configured to form, from the setting data respectively stored in the ejection relevant waveform setting register and the first high impedance setting register, an ejection relevant driving pulse for setting the electrode of the ink chamber communicating with the ejection relevant nozzle to the high impedance state for the predetermined period and form, from the setting data respectively stored in the ejection both-side waveform setting register and the second high impedance setting register, an ejection both-side driving pulse for setting the electrodes of the ink chambers communicating with the ejection both-side nozzles to the high impedance state for the predetermined period; and an output unit configured to output signals of the driving pulses formed by the waveform generating unit to the inkjet head.
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