| CPC B41J 2/04588 (2013.01) [B41J 2/04573 (2013.01); B41J 2/135 (2013.01)] | 7 Claims |
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1. A liquid discharge apparatus, comprising:
a liquid discharge head including:
a plurality of nozzles to discharge liquid droplets;
a plurality of individual liquid chambers communicating with the plurality of nozzles; and
a plurality of pressure generators to generate a pressure that pressurizes liquid in the plurality of individual liquid chambers; and
a head drive controller to output, to the plurality of pressure generators, a drive waveform including one pulse or two or more pulses selected according to a droplet size, wherein
in a case that the drive waveform includes the two or more pulses, the drive waveform includes a final pulse at an end of the two or more pulses,
the final pulse includes:
a first expansion waveform element for expanding the plurality of individual liquid chambers;
a first contraction waveform element for contracting the plurality of individual liquid chambers, the first contraction waveform element being subsequent to the first expansion waveform element;
a second expansion waveform element for expanding the plurality of individual liquid chambers, the second expansion waveform element being subsequent to the first contraction waveform element;
a second contraction waveform element for contracting the plurality of individual liquid chambers, the second contraction waveform element being subsequent to the second expansion waveform element; and
a third expansion waveform element for expanding the plurality of individual liquid chambers, the third expansion waveform element being subsequent to the second contraction waveform element,
when a natural vibration period of the plurality of the plurality of individual liquid chambers is defined as Tc,
a time period from a start of the first contraction waveform element to a start of the second expansion waveform element is less than 0.5 Tc, and
a time period from the start of the first contraction waveform element to a start of the second contraction waveform element is within a range from 0.5 Tc to 0.6 Tc.
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