There is provided a printing apparatus including: a nozzle; a head; a signal generating circuit configured to generate, based on at least a first data representing a first driving waveform and a second data representing a second driving waveform different from the first driving waveform, a time division multiplex signal; a separating circuit to which the time division multiplex signal is inputted and which includes a switch configured to separate, from the time division multiplex signal, a first driving waveform signal representing the first driving waveform or a second driving waveform signal representing the second driving waveform, based on a synchronization signal; and a synchronization signal generating circuit configured to generate the synchronization signal indicating an opening and closing timing of the switch. The synchronization signal generating circuit is a circuit different from the signal generating circuit.

A liquid discharge method includes: calculating a first print time to print original image data on a print medium; generating rotated image data by rotating the original image data by a predetermined angle; calculating a second print time to print the rotated image data on the print medium; comparing the first print time and the second print time to determine whether the first print time is larger than the second print time; generating print image data according to the rotated image data in response to a determination in which the first print time is larger than the second print time; generating print image data according to the original image data in response to a determination in which the first print time is smaller than the second print time; and displaying a position and a direction of the print medium based on the print image data.

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.

There is provided a liquid discharge apparatus including: a liquid discharge head having a nozzle; an electrode facing the nozzle; a power supply which generates a potential difference between the liquid discharge head and the electrode; a first output unit which outputs a first signal in accordance with an electric change in a case that the liquid discharge head is caused to perform inspection driving; a low-pass filter; a second output unit; a high-pass filter; a third output unit; and a controller. The controller executes determination as to whether or not the liquid is normally discharged from the nozzle, based on the first signal; and determination as to whether or not a short circuit occurs between the liquid discharge head and the electrode, based on a second signal output from the second output unit and a third signal output from the third output unit.

A liquid discharge device including a first piezoelectric element that has a first electrode and a second electrode and discharges a liquid from a first nozzle by being driven, a second piezoelectric element that has a third electrode and a fourth electrode and discharges a liquid from a second nozzle by being driven, a reference voltage signal propagation path that electrically couples the second electrode and the fourth electrode and propagates the reference voltage signal supplied to a first coupling point to the second electrode and the fourth electrode, and a first capacitor electrically coupled to the reference voltage signal propagation path at a second coupling point provided in the reference voltage signal propagation path, in which the second coupling point is located between the first coupling point and the second electrode in the reference voltage signal propagation path.

In a liquid discharge apparatus, a head unit includes a plurality of print heads, and a housing that houses the print heads, in which a first print head in the plurality of print heads includes a substrate that includes a first side, a second side, a first surface, and a second surface, a first nozzle plate, a first integrated circuit that is provided on the first surface, that outputs an abnormality signal indicating presence or absence of abnormality of the first print head, a first flexible wiring substrate that is electrically coupled to the substrate, and a second integrated circuit that is provided on the first flexible wiring substrate, the second integrated circuit is located between the first nozzle plate and the substrate, and the substrate is provided so that the first surface faces downward and the second surface faces upward in a direction along a vertical direction.

According to one embodiment, a control circuit for an inkjet head or the like includes an input circuit configured to receive drive information for driving liquid ejection from a plurality of nozzle arrays. The drive information includes a drive signal value to be supplied to a channel of the plurality of nozzle arrays. A latch circuit array of the control circuit has latch circuits for storing the drive information for each array in the plurality of nozzle arrays. A setting register is configured to receive a setting value to configure the input circuit to correspond to a connection mode for the plurality of latch circuits. The setting value corresponds to the number of arrays in the plurality of nozzle arrays.

A liquid discharge device includes: a piezoelectric element to which a drive voltage is applied; a nozzle from which a liquid is to be discharged in accordance with a change of the drive voltage; and circuitry configured to: generate: a first drive waveform including first multiple pulses switchable at first switch timings; and a second drive waveform including second multiple pulses different from the first multiple pulses switchable at second switch timings, at least one the first switch timings of the first multiple pulses of the first drive waveform and at least one of the second switch timings of the second multiple pulses of the second drive waveform are the same; select first selected pulses from the first multiple pulses in the first drive waveform; and select second selected pulses from the second multiple pulses in the second drive waveform.

A liquid ejecting system includes a head unit that includes a pressure chamber, a drive element driven by an applied drive waveform, a vibration plate that vibrates by drive of the drive element, and a nozzle through which a liquid is ejected by a pressure applied in the pressure chamber by vibration of the vibration plate, and an input portion to which an input parameter for detecting an ejection failure of the liquid based on residual vibration of the vibration plate is input from a server through a network connection portion.