IMAGE FORMING APPARATUS WITH INK-JET PRINTING SYSTEM

摘要

An image forming apparatus comprises a printing head unit, a driving waveform generator that generates and outputs a driving waveform having four or more driving pulses in chronological order per driving cycle, and a selector that selects and applies one of multiple driving pulses to a pressure generator to cause a printing head unit to selectively discharge a liquid droplet of three or more different sizes. The driving waveform includes three or more driving pulses at least having a final driving pulse to collectively discharge the biggest liquid droplet. The driving waveform includes a micro-driving pulse for discharging a smallest droplet within a time period of from about 2×Tc to about 4×Tc after the driving waveform starts being outputted when Tc represents a natural vibration period of a separate liquid chamber of the printing head unit.