US 12,220,915 B2
Liquid discharge apparatus, drive waveform generation device, and head drive method
Takahiro Yoshida, Kanagawa (JP); and Kenichi Taguma, Kanagawa (JP)
Assigned to Ricoh Company, Ltd., Tokyo (JP)
Filed by Takahiro Yoshida, Kanagawa (JP); and Kenichi Taguma, Kanagawa (JP)
Filed on Jan. 10, 2023, as Appl. No. 18/095,139.
Claims priority of application No. 2022-019129 (JP), filed on Feb. 9, 2022.
Prior Publication US 2023/0249455 A1, Aug. 10, 2023
Int. Cl. B41J 2/045 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/04581 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A liquid discharge apparatus comprising:
a head including a pressure chamber and a nozzle, the head configured to discharge a liquid in the pressure chamber from the nozzle;
circuitry configured to generate a drive waveform including multiple drive pulses to be applied to the head,
the drive waveform successively including, in time series:
a non-discharge pulse that does not cause the head to discharge the liquid from the nozzle;
a latter discharge pulse after the non-discharge pulse, the latter discharge pulse including a contraction waveform element that contracts the pressure chamber to discharge the liquid from the nozzle; and
a contraction waveform including the contraction waveform element that contracts the pressure chamber,
wherein a wave height value of the non-discharge pulse is within ±10% of a wave height value of the non-discharge pulse when a droplet velocity of the liquid discharged by successively applying the non-discharge pulse and the latter discharge pulse to the head reaches a minimum value, and
a time from a start of the contraction waveform element of the latter discharge pulse to a start of the contraction waveform element of the contraction waveform is ±⅙ to ⅚ times of a resonance period of the pressure chamber.