Patent ID: 7901034

Claim:
An image forming device which forms an image on a medium and includes a liquid discharge head in which a plurality of nozzles for discharging liquid drops are arranged side by side, comprising: a drive waveform generating unit generating, within a single drive cycle, a first drive waveform containing a drive signal to discharge an amount of liquid drop used for image formation, and a second drive waveform containing a drive signal to discharge an amount of liquid drop smaller than a minimum discharge drop amount used for image formation; and a head control unit causing the liquid discharge head to discharge the amount of liquid drop used for image formation in accordance with the first drive waveform for a region where an image is formed, and causing the liquid discharge head to discharge the amount of liquid drop smaller than the minimum discharge drop amount in accordance with the second drive waveform for a region where any image is not formed, wherein each of the drive signal in the first drive waveform and the drive signal in the second drive waveform contains a drawing waveform element which causes a liquid chamber communicating with one of the plurality of nozzles of the liquid discharge head to expand, and a voltage change of the drawing waveform element of the drive signal in the second drive waveform is larger than a voltage change of the drawing waveform element of the drive signal in the first drive waveform.