DISPOSITIF DE DÉCHARGE DE LIQUIDE ET PROCÉDÉ DE COMMANDE DU DISPOSITIF DE DÉCHARGE DE LIQUIDE

摘要

A liquid discharge apparatus that includes a liquid discharge head including a nozzle discharging liquid onto a recording medium, a liquid chamber communicating with the nozzle, and a pressure generating unit generating pressure by a change in a drive waveform of the liquid in the liquid chamber, a drive waveform generating unit generating the drive waveform applied to the pressure generating unit, and a waveform selection unit selectively masking a part of the drive waveform applied to the pressure generating unit and selecting a pulse of the drive waveform applied to the pressure generating unit, wherein the drive waveform includes at least one discharge pulse for discharging the liquid and a micro-drive pulse for causing a change in meniscus so that the liquid is not discharged from the nozzle at a point where the liquid is not discharged on the recording medium, wherein the micro-drive pulse is disposed at a head of a discharge cycle of the drive waveform, and wherein, when electric potential of the micro-drive pulse and electric potential of the discharge pulse change in a same direction, the micro-drive pulse is disposed at an integer multiple of a natural vibration cycle Tc of the liquid chamber with respect to the discharge pulse of a previous discharge cycle during continuous driving.