公开(公告)号：EP4357138A1

公开(公告)日：2024-04-24

申请号：EP23203780.4

申请日：2023-10-16

申请人： Ricoh Company, Ltd.

发明人： WATANABE, Hayato ,  NAGAI, Koji

IPC分类号： B41J2/14 ,  B41J2/045

CPC分类号： B41J2/14274 ,  B41J2002/1440320130101 ,  B41J2/04588 ,  B41J2/04581 ,  B41J2/04593 ,  B41J2/04596 ,  B41J2/04516

摘要： A liquid discharge apparatus (1) includes a liquid discharge head (34a, 34b) including a plurality of nozzles (104) to discharge liquid droplets, a plurality of individual liquid chambers (106) communicating with the plurality of nozzles (104), and a plurality of pressure generators (112) to generate a pressure that pressurizes liquid in the plurality of individual liquid chambers, and a head drive controller (509) to output, to the plurality of pressure generators (112), a drive waveform including one pulse or two or more pulses selected according to a droplet size. 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, a first contraction waveform element, a second expansion waveform element, a second contraction 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. 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. 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.