US 12,138,920 B2
Pulse waveforms for ink jet printing
Haggai Karlinski, Ramat Gan (IL); and Yishai Castel, Kibbutz Netzer Sereni (IL)
Assigned to LANDA CORPORATION, Rehovot (IL)
Filed by LANDA CORPORATION LTD., Rehovot (IL)
Filed on Apr. 4, 2023, as Appl. No. 18/295,280.
Application 18/295,280 is a division of application No. 17/706,636, filed on Mar. 29, 2022, granted, now 11,648,772.
Application 17/706,636 is a continuation of application No. 17/291,630, granted, now 11,325,377, issued on May 10, 2022, previously published as PCT/IB2019/056888, filed on Aug. 14, 2019.
Claims priority of provisional application 62/767,533, filed on Nov. 15, 2018.
Prior Publication US 2023/0256736 A1, Aug. 17, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B41J 29/38 (2006.01); B41J 2/045 (2006.01); B41J 2/21 (2006.01)
CPC B41J 2/04588 (2013.01) [B41J 2/04586 (2013.01); B41J 2/2103 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A digital printing system, comprising:
a print head, configured to jet droplets of ink; and
a processor, which is configured to:
translate a required shade of a color, to be printed at a given location on a substrate by the print head, into a sequence of one or more pulses,
wherein for at least one shade, the sequence of one or more pulses comprises:
up to a predefined maximum number of driving pulses that cause the print head to jet respective droplets; and
a tickling pulse, which has a smaller amplitude than the driving pulses and is such that when the tickling pulse is applied just after a driving pulse, it causes the print head to jet a droplet, while if the tickling pulse is applied not just after a driving pulse, it does not cause the print head to jet a droplet; and
apply the sequence of pulses to the print head.