Patent ID: 7114792

Claim:
A system for correcting ink droplet placement errors in a recording apparatus, comprising: a recording apparatus recording images on a recording medium which is conveyed in a first direction past discharging ink droplets from a recording head part to the recording medium, the recording head part having a plurality of recording heads arranged in the first direction, the recording heads having a plurality of recording head arrays, the recording head arrays having a plurality of recording head units arranged in a second direction perpendicular to the first direction, the recording head units having an ink discharging surface; an identifying unit for identifying ink droplet placement errors by the recording head units in the first direction; and a controlling unit for controlling timing to discharge ink droplets by the recording head units to reduce ink droplet placement errors based on the errors; wherein the controlling unit controls timing to discharge ink droplets roughly based on a printing pulse and controls timing to discharge the droplets finely based on a controlling pulse having a higher frequency than that of the printing pulse.