Patent ID: 7753464
Filing Date: 2010-07-13
Classification: B41J

Abstract:
1. A liquid-jet-apparatus comprising: a driving signal generating unit that generates a ejecting driving signal, which is a periodic signal having a plurality of pulse waveforms; a driving pulse generating unit that generates a driving pulse string for each unit region of a medium to be printed upon, on the basis of gray-scale data for the unit region, the ejecting driving signal, and information on whether the driving pulse string generated for a previous unit region includes a last pulse waveform or a pulse waveform immediately before the last pulse waveform in one cycle of the ejecting driving signal; and a control unit that drives a pressure changing unit on the basis of the driving pulse, wherein the one cycle of the ejecting driving signal corresponds to one unit region of the medium to be printed upon, wherein the gray-scale data includes data for a small dot for forming a small dot on the medium to be printed upon, and if the gray-scale data for the unit region is the data for a small dot, at least a first pulse waveform of the driving pulse string generated by the driving pulse generating unit when the driving pulse string generated for the previous unit region includes the last pulse waveform or the pulse waveform immediately before the last pulse waveform in the one cycle of the ejecting driving signal is shifted in terms of time to the latter part of at least a first pulse waveform of the driving pulse string generated by the driving pulse generating unit when the driving pulse string generated for the previous unit region does not include either the last pulse waveform or the pulse waveform immediately before the last pulse waveform in the one cycle of the ejecting driving signal.