A liquid droplet ejection device includes at least one first liquid droplet ejection unit including a first liquid holding unit and a first tip, the first tip to eject the first liquid in the first liquid holding unit as a first liquid droplet onto an object; at least one second liquid droplet ejection unit including a second liquid holding unit and a second tip, the second tip to eject the second liquid in the second liquid holding unit as a second liquid droplet onto the object; an object holding unit to hold the object; and a driving unit to move the first tip and the second tip in a first direction. An inner diameter of the second tip is larger than an inner diameter of the first tip. The first tip and the second tip are arranged along the first direction. The second tip is arranged behind the first tip.

A print nozzle assembly is presented for use in a printer. The print nozzle assembly may include: a printing pin; a wetting mechanism associated with the printing pin, and an ink retraction mechanism integrated into the wetting mechanism. The wetting mechanism includes an ink reservoir with an outlet arranged in close proximity to a tip of the printing pin. The ink retraction mechanism is configured to retract ink away from the outlet of the ink reservoir.

A print nozzle assembly is presented for use in a printer. The print nozzle assembly may include: a printing pin; a wetting mechanism associated with the printing pin, and an ink retraction mechanism integrated into the wetting mechanism. The wetting mechanism includes an ink reservoir with an outlet arranged in close proximity to a tip of the printing pin. The ink retraction mechanism is configured to retract ink away from the outlet of the ink reservoir.

A liquid ejecting apparatus includes a drive signal generation circuit generating a drive waveform signal, a liquid ejecting head including a vibration plate, a drive element displacing the vibration plate by being supplied with the drive waveform signal, a cavity that is filled with a liquid and of which an internal pressure changes by the displacement of the vibration plate, and a nozzle that communicates with the cavity and that ejects the liquid by the change in internal pressure of the cavity, and an ejecting malfunction detection circuit that detects, specifies a cause of the ejecting malfunction based on the residual vibration signal. The ejecting malfunction detection circuit includes a detection unit detecting the residual vibration signal, an obtaining unit obtaining information indicating an ejecting state of the liquid ejected from the nozzle, and a learning unit machine learning a relationship between the residual vibration signal and the ejecting state.

An inkjet apparatus for display manufacturing includes a nozzle unit having a discharge port for discharging ink to a substrate, a charging unit disposed on a side of the nozzle unit and charging the ink, and an accelerating electrode disposed on an opposite side of the nozzle unit with the substrate interposed therebetween, and accelerating the ink towards the substrate by electrical attraction.

Disclosed is an electrohydrodynamic printing apparatus including: a nozzle configured to discharge liquid toward a substrate; a voltage applier configured to form an electric field between the nozzle and the substrate; and a laser beam emitter configured to emit a laser beam toward a position to which liquid is discharged on the substrate. Thus, it is possible to accurately and stably form a microscale deposition structure.

Disclosed is an induced electrohydrodynamic (EHD) jet printing apparatus including: a nozzle configured to discharge a fed solution to an opposite substrate; a main electrode contactlessly isolated from the solution inside the nozzle by an insulator; and a voltage supplier configured to apply voltage to the main electrode.

Disclosed is an induced electrohydrodynamic (EHD) jet printing apparatus including: a nozzle configured to discharge a fed solution to an opposite substrate; a main electrode contactlessly isolated from the solution inside the nozzle by an insulator; and a voltage supplier configured to apply voltage to the main electrode.

Disclosed are a cartridge nozzle assembly and an apparatus for injecting ink including the cartridge nozzle assembly. In the ink injecting apparatus for forming a pattern by adhering the ink injected from a nozzle onto a substrate, the ink injecting apparatus includes a cartridge nozzle assembly, in a cartridge type, including a chamber sealingly accommodating the ink, and the nozzle for discharging the ink accommodated in the chamber; and a cartridge nozzle fixing member for replaceably fixing the cartridge nozzle assembly.

A fluid ejection device includes a fluid slot, at least one fluid ejection chamber communicated with the fluid slot, a drop ejecting element within the at least one fluid ejection chamber, a fluid circulation channel communicated with the fluid slot and the at least one fluid ejection chamber, and a fluid circulating element communicated with the fluid circulation channel. The fluid circulating element is to provide on-demand circulation of fluid from the fluid slot through the fluid circulation channel and the at least one fluid ejection chamber.