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.

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.

A liquid discharge method of discharging a liquid from a nozzle of a liquid discharge head by applying a drive pulse to a drive element of the liquid discharge head includes an acquisition step of acquiring a recording condition including a first discharge characteristic and a second discharge characteristic of the liquid from the liquid discharge head, a determination step of determining the drive pulse to be applied to the drive element, based on the recording condition, and a driving step of applying the drive pulse determined in the determination step to the drive element. In the liquid discharge method, in the determination step, the drive pulse is determined by a determination method subjected to weighting in which a weight of the first discharge characteristic is greater than a weight of the second discharge characteristic.

A maintenance method for a liquid discharging apparatus including a liquid discharging head. The liquid discharging apparatus executes a printing process including a discharging process in which the liquid discharged from the liquid discharging head lands on the medium, and a maintenance process in which the liquid is discarded from the liquid discharging head. The maintenance method includes: counting a unit period number, which is the number of ended unit periods among a plurality of unit periods obtained by dividing a period required for the printing process in accordance with a first condition; executing the maintenance process when the unit period number reaches a defined number; acquiring viscosity information related to viscosity of the liquid inside the liquid discharging head; and decreasing the unit period number when the viscosity information satisfies a second condition.

An image forming apparatus includes a print head including heating elements for applying a thermal energy to an imaging material, an operation unit configured to operate the plurality of heating elements of the print head by using a first pulse for preheating the color developing layers and a second pulse for developing the colors of the color developing layers, and a generation unit configured to, in a case where a spatial frequency of the image to be recorded based on image data for forming an image on the imaging material is lower than a predetermined frequency, generate the first pulse so that a temperature to be applied to the imaging material by the first pulse is lower than a temperature to be applied to the imaging material in a case where the spatial frequency of the image data is equal to or higher than the predetermined frequency.

A liquid ejection apparatus is configured to control a supply of a drive signal to a drive element by a controller so that a target period is either an ejection period or a non-ejection period based on print data. The drive signal includes an ejection pulse and a non-ejection pulse. The controller: does not supply the non-ejection pulse to the drive element when the target period is the non-ejection period and an elapsed time length from the last ejection period is less than the predetermined time length, and supplies the non-ejection pulse to the drive element when the target period is the non-ejection period and the elapsed time length is equal to or longer than the predetermined time length. The predetermined time length is an integral multiple or more of ½ of a natural vibration cycle of a meniscus of a liquid in the nozzle.

In a head substrate according to an embodiment of the present invention comprises a plurality of nozzles for discharging liquid; a plurality of electrothermal transducers corresponding to the plurality of nozzles; and a plurality of drivers corresponding to the plurality of electrothermal transducers, the substrate has the following configuration. Specifically, it comprises a detection circuit that detects, in a case where one of the plurality of electrothermal transducers is selected, a temperature of the selected transducer to which a first signal is applied to in order to discharge a liquid from a nozzle corresponding to the selected electrothermal transducer, and then a second signal is applied to heat the selected electrothermal transducer.

According to one embodiment, an inkjet head includes a pressure chamber for ink, a nozzle plate including a nozzle connected to the pressure chamber, an actuator to change a volume of the pressure chamber, and a drive circuit that drives the actuator. The drive circuit drives the actuator according to a drive waveform including an expansion waveform, a first weak contraction waveform, a contraction waveform, and a second weak contraction waveform.

A liquid discharge device in which a drive circuit substrate that outputs a first drive signal supplied to a first electrode, a substrate, a first drive circuit that has a first circuit element in which a ground potential is supplied to one end and outputs the first drive signal, a first capacitor in which one end is electrically coupled to the second electrode and a ground potential is supplied to the other end, and a second capacitor in which one end is electrically coupled to the second electrode and a ground potential is supplied to the other end, the substrate includes a first surface and a second surface, the first capacitor is a chip capacitor, the second capacitor is an electrolytic capacitor, the first circuit element and the first capacitor are provided on the first surface, and the second capacitor is provided on the second surface.

A liquid discharge device including a drive circuit substrate that drives a piezoelectric element of a liquid discharge head, and that includes a substrate which includes a first wiring layer having a first wiring through which the first drive signal propagates, a second wiring layer having a second wiring through which the second drive signal propagates, and a third wiring layer located between the first wiring layer and the second wiring layer and having a fourth wiring through which the reference voltage signal propagates, in which a third wiring through which the third drive signal propagates is provided on any one of the first wiring layer, the second wiring layer, and the third wiring layer.