The present disclosure relates to an induced electrohydrodynamic jet printing apparatus including an induced auxiliary electrode, and the induced electrohydrodynamic jet printing apparatus including an induced auxiliary electrode according to the present disclosure includes a nozzle for discharging supplied solution towards an opposite substrate through a nozzle hole formed at one end; a main electrode coated with an insulator and interpolated inside the nozzle, thus not contacting the solution inside the nozzle but separated from the solution; the induced auxiliary electrode made of a conductive material and formed at an outer surface of the nozzle; and a voltage supply for applying voltage to the main electrode.

Example methods, apparatus, systems for droplet actuator fabrication are disclosed. An example non-transitory computer readable medium includes instructions that, when executed, cause at least one processor to at least control movement of a laser to cause the laser to etch an electrode pattern in a first substrate, the electrode pattern including a first set of electrodes, a second set of electrodes, and a third set of electrodes; control a printer driver to cause a hydrophobic material and a dielectric material to be applied to the second set of electrodes and not the first set of electrodes via a printer; control a bonding driver to cause a gap to be defined between the first substrate and a second substrate; and control a dicing driver to cause a portion the first substrate and a portion of the second substrate to be cut into a droplet actuator.

Example methods, apparatus, systems for droplet actuator fabrication are disclosed. An example non-transitory computer readable medium includes instructions that, when executed, cause at least one processor to at least control movement of a laser to cause the laser to etch an electrode pattern in a first substrate, the electrode pattern including a first set of electrodes, a second set of electrodes, and a third set of electrodes; control a printer driver to cause a hydrophobic material and a dielectric material to be applied to the second set of electrodes and not the first set of electrodes via a printer; control a bonding driver to cause a gap to be defined between the first substrate and a second substrate; and control a dicing driver to cause a portion the first substrate and a portion of the second substrate to be cut into a droplet actuator.

Example methods, apparatus, systems for droplet actuator fabrication are disclosed. An example method disclosed herein for making a droplet actuator includes ablating a first substrate with a laser to form an electrode array on the first substrate. The example method includes applying at least one of hydrophobic or a dielectric material to the electrode array. The example method also includes aligning the first substrate with a second substrate. The second substrate includes a second treated layer. In the example method, the alignment includes a gap between at least a portion of the first treated layer and at least a portion the second treated layer.

Example methods, apparatus, systems for droplet actuator fabrication are disclosed. An example method disclosed herein for making a droplet actuator includes ablating a first substrate with a laser to form an electrode array on the first substrate. The example method includes applying at least one of hydrophobic or a dielectric material to the electrode array. The example method also includes aligning the first substrate with a second substrate. The second substrate includes a second treated layer. In the example method, the alignment includes a gap between at least a portion of the first treated layer and at least a portion the second treated layer.

A method of printing a print pattern onto a substrate with a print head comprises a plurality of nozzles, where the print head has a rectangular active print head area which includes all of the nozzles. The active print head area is delimited by four sides defining a primary and a secondary direction. The method comprises i) decomposing the print pattern into a plurality of print pattern segments that have dimensions along the primary and secondary direction which are smaller than the dimensions of the active print head area along the primary and secondary direction; ii) assigning each print pattern segment to exactly one nozzle; iii) causing each nozzle to print the print pattern segment assigned to said nozzle. The print head is moved during printing of each print pattern segment within an area that is smaller than said active print head area.

A liquid droplet ejection device includes a first liquid droplet ejection unit including a first liquid holding unit configured to hold a first liquid and a first tip configured to eject a first liquid of the first liquid holding unit as a first liquid droplet, a second liquid droplet ejection unit including a second liquid holding unit configured to hold a second liquid and a second configured tip to eject the second liquid of the second liquid holding unit as a second liquid droplet differing from the first liquid droplet, an object holding unit configured to hold an object the first liquid and the second liquid being ejected to the object, and a driving unit configured to move the first tip and the second tip in a first direction relative to the object holding unit, and the first tip is arranged in the first direction relative to the second 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.

An electrohydrodynamic print head includes a plurality of nozzles and a common electrode. Separately controllable electrostatic fields between the common electrode and each nozzle are provided. The common electrode can also shield adjacent electrostatic fields from each other. Each nozzle can be associated with separately controllable gas flow fields and separately back pressures. The print head enables simultaneous e-jet printing of different printing fluids and/or different resolutions. The print head may be part of a printing system with interchangeable cartridges. Each cartridge has multiple nozzles, and printing fluid extraction parameters can be made separately controllable for each nozzle.

An electrohydrodynamic print head includes a plurality of nozzles and a common electrode. Separately controllable electrostatic fields between the common electrode and each nozzle are provided. The common electrode can also shield adjacent electrostatic fields from each other. Each nozzle can be associated with separately controllable gas flow fields and separately back pressures. The print head enables simultaneous e-jet printing of different printing fluids and/or different resolutions. The print head may be part of a printing system with interchangeable cartridges. Each cartridge has multiple nozzles, and printing fluid extraction parameters can be made separately controllable for each nozzle.