An inkjet nozzle device includes a main chamber having a floor, a roof and a perimeter wall extending between the floor and the roof. The main chamber includes: a firing chamber having a nozzle aperture defined in the roof and a bar heater for ejection of ink through the nozzle aperture; an antechamber for supplying ink to the firing chamber, the antechamber having a chamber inlet defined in the floor; and a baffle plate extending parallel with the bar heater, which partitions the main chamber to define the firing chamber and the antechamber. The nozzle device has mirror symmetry about a symmetry plane extending perpendicular to the longitudinal axes of the bar heater and the baffle plate

In order to make it less likely for the accuracy of determination of the ejection state of a liquid ejection head to be low, a liquid ejection apparatus sets a determination threshold for determining an ejection state of the liquid ejection head using first energy, the determination threshold being set based on a first output value outputted from the output unit in an event where the heat generating resistance element is driven with the first energy in an ejection state in which the liquid is ejected from an ejection port and a second output value estimated to be outputted from the output unit assuming the heat generating resistance element is driven with the first energy in a non-ejection state in which the liquid is not ejected.

The disclosure relates to a method and apparatus for preventing oxidation or contamination during a circuit printing operation. The circuit printing operation can be directed to OLED-type printing. In an exemplary embodiment, the printing process is conducted at a load-locked printer housing having one or more of chambers. Each chamber is partitioned from the other chambers by physical gates or fluidic curtains. A controller coordinates transportation of a substrate through the system and purges the system by timely opening appropriate gates. The controller may also control the printing operation by energizing the print-head at a time when the substrate is positioned substantially thereunder.

A liquid ejecting head includes: a nozzle that has a nozzle opening from which liquid is ejected; a pressure compartment that is in communication with the nozzle; a drive element configured to vary pressure of the liquid inside the pressure compartment for ejecting the liquid from the nozzle opening; and a control element configured to apply energy to the liquid in a flow passage from the pressure compartment to the nozzle opening.

An ink jet recording method by using an ink jet recording apparatus equipped with a line head, wherein the line head includes a plurality of recording element substrates each having a nozzle array comprised of a plurality of nozzles, which eject an aqueous ink, arranged in a predetermined direction, the recording element substrates are arranged in the predetermined direction such that the recording element substrate constitutes an overlapping portion at which the terminal portion of the recording element substrates is overlapped with the terminal portion of adjacent recording element substrate in the predetermined direction, and the average temperature To ( C.) of an ink ejected from overlapping-portion nozzles included in the overlapping portion of the nozzle array and the average temperature Tc ( C.) of an ink ejected from the center-portion nozzle included in the center portion of the nozzle array satisfy the relationship Tc>To.

A recording apparatus includes a recording head having a plurality of recording elements configured to generate energy for discharging ink, a first heating element configured to heat ink in the vicinity of one of said recording elements positioned at a first position, insufficiently to discharge ink, and a second heating element positioned at a second position different from the first position, which are arranged on a same substrate, a heating control unit configured to control the heating operation of the ink by driving the first and the second heating elements by applying voltage to the first and the second heating elements, and a recording control unit configured to control the recording operation by driving the plurality of recording elements, wherein the heating control unit is configured to control the heating operation to drive the first heating element and the second heating element at timings different from each other.

A liquid ejection head substrate includes a base layer, a heating resistance element provided over the base layer to generate a heat energy for ejecting a liquid, a first insulation layer covering the heating resistance element, and a protective layer having, on the first insulation layer, a first region which overlaps the heating resistance element via the first insulation layer and a second region which does not overlap the heating resistance element and formed of a material including a metal which is eluted by an electrochemical reaction. The liquid ejection head substrate further includes a second insulation layer provided over a region overlying the base layer and not provided with the protective layer and over the second region of the protective layer.

A head module includes: a head chip having an actuator, a channel member having a channel deformable by the actuator, and a support made of metal and supporting the channel member, a heater assembly; and a heat conductor. The heat conductor has a first contacting part in thermal contact with the support, and a second contacting part in thermal contact with the heater assembly and the actuator.

A drop-on-demand printing method comprising performing the following steps in a printing head: discharging a first primary drop (x21A) of a first liquid to move along a first path; discharging a second primary drop (x21B) of a second liquid to move along a second path; controlling the flight of the first primary drop (x21A) and the second primary drop (x21B) to combine the first primary drop with the second primary drop into a combined drop (x22) at a connection point (x32) within a reaction chamber within the printing head so that a chemical reaction is initiated within a controlled environment of the reaction chamber between the first liquid of the first primary drop and the second liquid of the second primary drop; and controlling the flight of the combined drop (x22) at least by means of a stream of gas (x71A, x71B).

A liquid ejection apparatus includes: a head configured to eject a liquid; a heat source; and a transfer member configured to transfer heat generated by the heat source to the head. The head includes a nozzle plate having a nozzle surface where a nozzle configured to eject a liquid opens, and a main body portion to which the nozzle plate is attached and which includes a supply flow path in communication with the nozzle. The transfer member surrounds the nozzle plate.