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.

A liquid droplet discharge apparatus includes a discharge head having a nozzle for discharging liquid droplets onto a printing medium and an actuator for applying pressure to liquid in a pressure chamber communicated with the nozzle; a waveform generating circuit for generating driving waveforms of signals for driving the actuator; a surface information acquiring device configured to acquire information about a surface of the printing medium; and a controller. The controller calculates a volume of a recess on the printing medium based on the information acquired by the surface information acquiring device; causes the waveform generating circuit to generate a driving waveform for filling up the recess in accordance with the volume of the recess; and drives the actuator in accordance with the driving waveform generated by the waveform generating circuit such that the liquid droplets are discharged from the nozzle to the recess.

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.

An image forming apparatus includes: a piezoelectric element with a common electrode on one side and an individual electrode on another side; a nozzle; and circuitry. The circuitry selects one from drive signals and supplies the one drive signal to the piezoelectric element via the individual electrode, to discharge a droplet through the nozzle to form an image. Each drive signal includes waveform pulses including a main pulse that rises in a slope shape during a rising time and finishes rising at an end time. The circuitry generates the drive signals so that the end time of a less influential drive signal other than a most influential drive signal falls within a range of the rising time of the main pulse of the most influential drive signal; selects the one drive signal based on an image to be formed; and supplies the one drive signal to the piezoelectric element.

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.

There is provided image formation method for forming image on medium by discharging liquid from head having nozzles arranged in first direction and actuators corresponding respectively to the nozzles. The method includes: discharging the liquid onto the medium from the nozzles by applying first voltage to the actuators while performing relative displacement between the head and the medium in second direction intersecting the first direction; and applying second voltage higher than the first voltage to actuator, of the actuators, corresponding to correction nozzle, based on information identifying discharge defect nozzle being a nozzle, of the nozzles, unable to discharge the liquid normally, the correction nozzle being a nozzle, of the nozzles, adjacent to the discharge defect nozzle in the first direction.

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.

A liquid ejecting system includes a head unit that includes a nozzle for ejecting a liquid, a pressure chamber communicating with the nozzle, and a drive element for applying pressure fluctuation to a liquid in the pressure chamber by supplying a drive pulse, an acquisition portion that acquires output information regarding a usage condition of the head unit, a first connection portion that is communicably connected to a server through a network, a first output portion that outputs the output information through the first connection portion, a first input portion to which input information regarding a waveform of the drive pulse supplied to the drive element is input through the first connection portion. A decision portion that decides the waveform of the drive pulse supplied to the drive element based on the input information.