Patent ID: 9616662
Date: 2017-04-11
CPC Classifications: B41J

Claim:
1. An image forming apparatus, comprising: a liquid discharging head unit including multiple nozzles arranged in a predetermined nozzle arrangement direction to discharge liquid droplets, individual liquid chambers communicated to the multiple nozzles, and pressure generating units to generate pressure applied to a liquid in the individual liquid chambers; and a head drive control unit to generate a common driving waveform including multiple discharging pulses arranged in time series within one driving cycle of discharging liquid droplets of the liquid, to select at least one of the multiple discharging pulses from the common driving waveform, and to apply the selected at least one of the discharging pulses to the pressure generating units, wherein the common driving waveform, generated by the head drive control unit, includes at least a first discharging pulse and a second discharging pulse, which occurs in time series to, and not overlapping with, the first discharging pulse within the same driving cycle of the common driving waveform, for discharging liquid droplets of same size, and when discharging liquid droplets of the same size from two adjacent nozzles of the multiple nozzles that are adjacent in the predetermined nozzle arrangement direction, the head drive control unit applies the first discharging pulse to the pressure generating unit of one nozzle of the adjacent nozzles and applies the second discharging pulse, which is in time series to, and not overlapping with, the first discharging pulse within the same driving cycle of the common driving waveform, to the pressure generating unit of the other nozzle of the adjacent nozzles, and wherein the liquid droplets discharged with the first discharging pulse and the liquid droplets discharged with the second discharging pulse impact an impacting surface at the same time.