Patent ID: 8303067

Claim:
An image forming apparatus comprising: a recording head having nozzles configured to eject liquid droplets, a liquid chamber in communication with the nozzles, and a pressure generator unit configured to generate pressure inside the liquid chamber to cause the nozzles to eject the liquid droplets; and a head drive control unit configured to generate a drive waveform having plural drive pulses arranged in time series, each of the drive pulses being formed by a designated arrangement of waveform components, to form at least one ejecting pulse for ejecting the liquid droplets by selecting one or more of the plural drive pulses of the drive waveform based on a corresponding one of liquid droplet sizes, and supply the at least one ejecting pulse based on the corresponding one of the liquid droplet sizes to the pressure generator unit, wherein, when the at least one ejecting pulse for ejecting the liquid droplets is formed by selecting a plurality of the plural drive pulses to form the corresponding one of the liquid droplet sizes, an arrangement of the waveform components of the selected plurality of drive pulses differs from the designated arrangement of the waveform components for each of the drive pulses.