Provided are a head device, an ink jet printing device, and a driving voltage adjustment method capable of adjusting a driving voltage corresponding to a target jetting amount and suppressing unevenness of printing density occurring between head modules. A dead device includes an ink jet head including a plurality of head modules, and a driving voltage supply device that includes a processor and supplies a driving voltage to the ink jet head, in which the processor acquires a module characteristic, acquires an ink characteristic of ink applied to printing, derives a first voltage coefficient for adjusting a driving voltage corresponding to a target jetting amount for each head module based on the module characteristic and the ink characteristic, and adjusts the driving voltage by applying the first voltage coefficient for each head module.

In this liquid ejecting head, the pressure chamber extends in a second direction crossing a first direction, the first direction being a direction from the pressure chamber to the nozzle. The pressure chamber and the absorbing chamber are disposed at a same position in the first direction and next to each other in the second direction. The actuator is disposed on an opposite side in the first direction with respect to the pressure chamber. The absorption member is disposed on the opposite side in the first direction with respect to the absorbing chamber, the absorption member including at least part of members constituting the actuator.

Provided are a control unit that predicts the life of an inkjet head unit and maximizes its life to be used, and a substrate treating apparatus including the same. The control unit performs maintenance of an inkjet head unit for discharging a substrate treatment liquid onto a substrate and comprises a count module for counting the number of discharges for each nozzle of the inkjet head unit, a comparison module for comparing the number of discharges with a reference value to determine whether the number of discharges is equal to or greater than the reference value, and an evaluation module for evaluating whether a life of the inkjet head unit has reached a usable life based on whether the number of discharges of each nozzle is equal to or greater than the reference value.

There is provided a printing apparatus including: a nozzle configured to discharge a liquid by an energy generating element; a selector configured to select, based on a print job, a driving waveform corresponding to a printing method indicated by the print job, from a plurality of driving waveforms different from each other; a signal generator configured to generate a time division multiplex signal, based on data indicating the driving waveform selected by the selector; and a separator configured to separate a driving waveform signal indicating the driving waveform selected by the selector from the time division multiplex signal generated by the signal generator. The energy generating element is configured to be driven by the driving waveform signal separated by the separator.

A liquid discharge apparatus includes: a liquid discharge head configured to discharge a liquid from a nozzle; a drive waveform generator configured to generate a drive waveform including multiple drive pulses to be applied to the liquid discharge head, the multiple drive pulses successively including: a first drive pulse configured to cause the liquid discharge head to discharge the liquid; a second drive pulse configured to cause the liquid discharge head not to discharged the liquid while causing meniscus of the liquid in the nozzle in the liquid discharge head to vibrate; and a third drive pulse configured to cause the liquid discharge head to discharge the liquid; in time series.

There is provided a head unit including: a discharge section that includes a piezoelectric element driven by a first driving signal and discharges a liquid; a switching circuit that switches whether or not to supply the first driving signal; a first substrate that propagates the first driving signal and the discharge control signal to the switching circuit; a second substrate to which the first driving signal and the discharge control signal are supplied and which propagates the first driving signal and the discharge control signal to the first substrate; a first coupling member including a first conductive section that electrically couples the first substrate and the second substrate; and a second coupling member including a second conductive section that electrically couples the first substrate and the second substrate, in which a cross-sectional area of the first conductive section is larger than a cross-sectional area of the second conductive section.

There is provided a head unit including: a discharge section that includes a piezoelectric element driven by a driving signal and discharges a liquid; a first substrate; a second substrate; and a coupling member that electrically couples the first substrate and the second substrate, in which the coupling member includes a pin header having a plurality of insertion pins including a first insertion pin and a second insertion pin, and a holding section that holds the plurality of insertion pins in a state of being insulated, and a pin socket having the same number of a plurality of insertion holes as the plurality of insertion pins, which are provided corresponding to the plurality of insertion pins, and the coupling member electrically couples the first substrate and the second substrate by inserting the plurality of insertion pins into the corresponding plurality of insertion holes.

A controller 10 activates a heater 21 when a temperature detected by a temperature sensor 13 for detecting a temperature of ink becomes lower than a first reference temperature Ta lower than the appropriate ink ejection temperature Ta at the time of printing pause in which printing is paused. After the heater 21 is activated, when the temperature detected by the temperature sensor 13 exceeds a predetermined second reference temperature T2 that is higher than the first reference temperature T1 and lower than the appropriate ink ejection temperature Ta, the controller 10 moves the inkjet head to the maintenance region and forcibly discharges ink from the inkjet head in the maintenance region.

An inkjet recording apparatus includes a plurality of nozzles, a pressurizing element, a driver, a controller and a control circuit. The pressurizing element is provided for each of the nozzles. The driver drives the pressurizing elements. The controller generates image data indicating whether ink is ejected for each of the nozzles. The control circuit transmits ejection waveform data indicating a signal transmitted to the pressurizing element and the image data. After printing according to the image data transmitted to the driver is completed, in a non-printing state in which there is no image data to be subsequently printed, the control circuit transmits at least one of the image data indicating a blank sheet and the ejection waveform data in which the ink is not ejected, to the driver.

There is provided a printing apparatus including: a head having nozzles aligned in a first direction, a manifold, and a driving element; a first temperature sensor configured to detect, in the manifold, a temperature difference between a temperature of the ink at an upstream in the first direction and a temperature of the ink at a downstream in the first direction; and a controller. The nozzles have a first nozzle and a second nozzle. The controller is configured to execute: causing of the head to perform printing, and performing of position correction of correcting a discharge timing of the ink from the nozzles based on the temperature difference so that a distance between a landing position of the ink discharged from the first nozzle and a landing position of the ink discharged from the second nozzle becomes short in a second direction crossing the first direction.