Liquid discharge apparatus and method for controlling liquid discharge

A liquid discharge apparatus comprising

• 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 different directions, the micro-drive pulse is disposed at a position satisfying “N×Tc+0.5Tc” relative to the discharge pulse of an immediately previous discharge cycle during continuous driving where Tc is a natural vibration cycle of the liquid chamber and N is an integer.