Patent ID: 7488049
Filing Date: 2009-02-10
Classification: B41J

Abstract:
1. A line head inkjet printer comprising: an inkjet head that comprises: a controller that generates n kinds of waveforms, which are used to eject different amounts of ink from the nozzles, respectively, where n is natural number equal to or larger than 3; and a storage unit that stores a combination of m kinds of waveforms selected from the n kinds of waveforms, for each block including at least one nozzle, where m is natural number and 2≦m≦n−1, wherein: when the printer conducts gradation printing using m kinds of waveforms selected from the n kinds of waveforms, a difference among the blocks in an amount of ejected ink per nozzle in a case of using the stored combinations of m kinds of waveforms for the respective blocks is smaller than that in a case of using one and the same combination of m kinds of waveforms for all the blocks; the controller selects a waveform for each block on a basis of input gradation data from the combinations of the m kinds of waveforms stored in the storage unit to output the selected waveform to an individual electrode of each block.