A liquid discharge apparatus includes a drive signal generation section configured to generate a plurality of drive pulses that is supplied to a pressure generation unit to change a pressure in liquid in a pressure chamber communicated with a nozzle. The plurality of drive pulses include: first and second discharge pulses to discharge liquid from the nozzle; and first and second micro-vibration pulses to not discharge liquid. The first discharge pulse and the first micro-vibration pulse are included in a first period included in a repetition cycle. The second discharge pulse and the second micro-vibration pulse are included in a second period included in the repetition cycle and later than the first period. The length from a start of the first period to the first micro-vibration pulse differs from the length from a start of the second period to the second micro-vibration pulse.

A liquid ejecting apparatus according to an aspect of the present disclosure has a nozzle configured to eject a liquid, a pressure chamber communicating with the nozzle, a piezoelectric element that varying pressure in the pressure chamber, an endless transport belt transporting a medium, an electrifying section electrifying the transport belt, and a driving circuit that supplying, to the piezoelectric element, a micro-vibration pulse that generates micro-vibration in the liquid in the pressure chamber without causing the liquid to be ejected from the nozzle. The micro-vibration pulse is varied according to first data related to the state of a meniscus in the nozzle in a first state in which the nozzle and the transport belt electrified by the electrifying section face each other.

A drive circuit for driving a first drive element having a first terminal and a second terminal and driving a second drive element having a third terminal and a fourth terminal, includes a first drive signal output circuit that is electrically coupled to the first terminal and outputs a first drive signal, and a second drive signal output circuit that is electrically coupled to the third terminal and outputs a second drive signal. The first drive signal output circuit includes a first reference voltage signal output circuit that outputs a first reference voltage signal. The first reference voltage signal output circuit is electrically coupled to the second terminal and the fourth terminal. The second drive signal output circuit is not electrically coupled to the second terminal and the fourth terminal. The first drive signal output circuit starts startup after the second drive signal output circuit.

According to one embodiment, a liquid ejection head includes a pressure chamber that contains a liquid, an actuator to change the pressure in the pressure chamber according to an applied drive signal, and a drive circuit to apply a first drive signal to the actuator when a single droplet is to be ejected from the pressure chamber and a second drive signal to the actuator when two or more droplets are to be ejected in series from the pressure chamber. The first drive signal has a first auxiliary pulse before a first ejection pulse. The second drive signal has a second auxiliary pulse before the first ejection pulse. A pulse width of the first auxiliary pulse is greater than a pulse width of the second auxiliary pulse.

A liquid discharging apparatus includes: a drive unit that includes a discharging head that discharges liquid; a first board that includes a control circuit that controls the discharging head; a first cable for electrical coupling between the control circuit and the drive unit; a second cable for electrical coupling between the control circuit and the drive unit; and housing inside which the drive unit, the first board, the first cable, and the second cable are housed. The second cable includes a shield layer containing a conductive material. The position of the first cable is between the housing and the second cable.

A liquid discharge device in which an inter-wiring region between a first wiring through which a first drive signal, and a second wiring through which a second drive signal propagates includes a wide inter-wiring region in which an inter-wiring distance between the first wiring and the second wiring is larger than a sum of a wire width of a fourth wiring and a minimum diameter of a via wiring, and a narrow inter-wiring region in which the inter-wiring distance is smaller than the sum of the wire width of the fourth wiring and the minimum diameter of the via wiring, and larger than a wire width of the via wiring, and a third wiring is not located in the narrow inter-wiring region between a virtual line coupling a first terminal and a second terminal, and the wide inter-wiring region, in the inter-wiring region of a first wiring layer.

A drive waveform acquisition unit that acquires a drive waveform, a drive voltage generation unit that generates the drive voltage, a jetting frequency setting unit that sets a jetting frequency on the basis of drop velocity information representing a relationship between the jetting frequency and a drop velocity in a single-shot, and a drive voltage supply unit that supplies the drive voltage to the jetting head are included. The jetting frequency setting unit sets a jetting frequency at which the drop velocity is a second velocity equal to or less than a first velocity in the drop velocity information as the jetting frequency of the jetting head.

A liquid ejecting apparatus includes a liquid ejecting head, a first drive signal, a second drive signal output circuit, a third drive signal output circuit that outputs a third drive signal, having a smaller voltage amplitude than voltage amplitudes of other drive signals, to drive the liquid ejecting head, and a first conductive component including a first conductive section that electrically couples the liquid ejecting head to the first drive signal output circuit, a second conductive section that electrically couples the liquid ejecting head to the second drive signal output circuit, and a third conductive section that electrically couples the liquid ejecting head to the third drive signal output circuit. The first conductive section is positioned between the second conductive section and the third conductive section.

A liquid ejecting apparatus is configured to drive a drive element that is driven in accordance with a drive signal for ejecting a plurality of liquid droplets such that the liquid droplets merge together before landing onto a medium. The drive signal includes a plurality of drive waveforms and a first connection waveform that is continuous from a second-to-last drive waveform and continuous to a last drive waveform and along which a potential of the drive signal is kept at a reference level. Pressure changes caused by the contraction waveform of the last drive waveform in a liquid present inside the pressure compartment are larger than pressure changes caused by the contraction waveform of the second-to-last drive waveform in the liquid present inside the pressure compartment. A period of the first connection waveform is 0.8 or more times as long as a natural vibration cycle of the ejecting portion.

A liquid discharge head includes a nozzle layer including a piezoelectric layer and having a nozzle penetrating through the nozzle layer, a liquid chamber communicating with the nozzle, and a drive circuit to apply a drive waveform to the piezoelectric layer to drive the piezoelectric layer. The drive waveform has a first waveform and a second waveform. The first waveform has a first voltage to discharge a liquid in the liquid chamber from the nozzle. The first voltage has a first rising edge from which the first voltage rises. The second waveform has a second voltage having a second rising edge from which the second voltage rises. The second rising edge is delayed from the first rising edge by (m−0.5)×Tc, where m represents a positive integer, and Tc represents a natural period of vibration of the piezoelectric layer.