There is provided a liquid discharge apparatus, in which a first inductance element included in a first demodulation circuit has a first terminal which a first amplified modulated signal is input, a second terminal which a first driving signal is output, a second inductance element included in a second demodulation circuit has a third terminal which is provided in a fourth side portion, and to which a second amplified modulated signal is input, a fourth terminal which is provided in a fifth side portion that faces the fourth side portion, and from which a second driving signal is output, and a second lead member coupled to the third terminal and the fourth terminal and having a third refraction point and a fourth refraction point, and the first inductance element and the second inductance element are positioned such that the second side portion and the fourth side portion face each other.

A liquid ejecting head control circuit controls a liquid ejecting head and a switching circuit. The liquid ejecting head control circuit includes a drive signal output circuit, and a switching control circuit. The switching control circuit outputs an ejection control signal defining an amount of a liquid to be ejected from a nozzle, a switching timing signal defining switching timing of the switching circuit, and a state selection signal defining a state of the switching circuit in a control period defined by the switching timing signal. The state selection signal for a first time period for which the liquid ejecting head is controlled so as to eject the liquid from the nozzle is different from the state selection signal for a second time period for which the liquid ejecting head is controlled so as not to eject the liquid from the nozzle.

In a device for regenerating a print head of an inkjet printing device, a fluid is applied onto the nozzle plate of the print head. The one or more nozzles of the print head can be subsequently operated with one or more no-ejection pulses to produce the effect that fluid is drawn from the nozzle plate into the one or more nozzles and mixes with the ink in the one or more nozzles that the viscosity of the ink in the one or more nozzles is reduced.

A method for cleaning an ink jet imaging device, the ink jet imaging device including a main ink supply channel including an entrance side for supplying ink, a first ink channel including a first pressure chamber fluidly connected to a first nozzle; a first actuator associated with the first pressure chamber, the first ink channel being in fluid connection with the main ink supply channel and defining a first ink path from the entrance side of the main ink supply channel to the first nozzle and having a first length L1; a second ink channel including a second pressure chamber fluidly connected to a second nozzle; and a second actuator associated with the second pressure chamber, the second ink channel being in fluid connection with the main ink supply channel and defining a second ink path from the entrance side of the main ink supply channel to the second nozzle and having a second length L2, wherein L2>L1. The method includes purging ink through the first and the second nozzle by applying a pressure on the entrance side of the main ink supply channel; and simultaneously actuating the first ink channel by applying a first actuation pulse to the first actuator wherein the actuation pulse provides a pressure wave in the first ink channel that counteracts the local pressure in the first ink channel, such that the flow through the first ink channel is reduced during purging.

An inkjet head includes a pressure chamber in which ink is stored, a nozzle plate including a nozzle which connects with the pressure chamber, an actuator configured to change a volume of the pressure chamber, and a drive circuit. The drive circuit, before a printing is performed, outputs, to the actuator for a first time period, a first signal for changing the volume of the pressure chamber without ejecting ink from the nozzle. A second signal for changing the volume of the pressure chamber is then output to the actuator for a second time period such that ink is ejected from the nozzle. A third signal for changing the volume of the pressure chamber to the extent that the ink is not ejected from the nozzle is then output to the actuator for a third time period.

There are provided a substrate on which a first integrated circuit, a first transistor, and a first inductor element are disposed, and which has a first side and a second side facing each other; a heat sink having a fifth side and a sixth side along the first side; the first integrated circuit, the first transistor, and the first inductor element are positioned in order of the first integrated circuit, the first transistor, and the first inductor element from the first side toward the second side, and the heat sink is fixed to the substrate such that a shortest distance between the fifth side and the first side is shorter than a shortest distance between the sixth side and the first side, and a shortest distance between the first integrated circuit and the fifth side is longer than a shortest distance between the first transistor and the sixth side.

A liquid discharge apparatus includes a liquid discharge head configured to discharge a liquid, and a drive waveform generator configured to generate a drive waveform to be applied to the liquid discharge head, the drive waveform including a first discharge pulse to cause the liquid discharge head to discharge the liquid, a second discharge pulse after the first discharge pulse, the second discharge pulse to cause the liquid discharge head to discharge the liquid, and a pulse interval between the first discharge pulse and the second discharge pulse, the pulse interval being equal to a time period in which the liquid is discharged by the second discharge pulse in a damping state in which the second discharge pulse is damped by a meniscus vibration generated by the first discharge pulse.

There are provided a first fixing section to a third fixing section that fix a heat sink to a substrate on which a first driving circuit and a second driving circuit are disposed; the first drive circuit includes first transistor and first integrated circuit, and the second drive circuit includes second transistor and second integrated circuit, lengths of the first transistor and the second transistor in the normal direction of the substrate are longer than lengths of the first integrated circuit and the second integrated circuit, the first fixing section and the second fixing section overlap a first virtual straight line that connects the first transistor and the second transistor, and the third fixing section overlaps a second virtual straight line that connects the first integrated circuit and the second integrated circuit to each other.

There is provided a head unit including: a substrate on which a first driving circuit is disposed; a heat sink fixed to the substrate; and heat conductive elastic bodies positioned between the substrate and the heat sink, in which the first driving circuit includes a first integrated circuit, a first amplifier circuit including a first transistor, and a first smoothing circuit that outputs the first driving signal, in which a first heat conductive elastic body is in contact with the heat sink and the first integrated circuit, a second heat conductive elastic body is in contact with the heat sink and the first transistor, and the first heat conductive elastic body and the second heat conductive elastic body are in a form of a gel having flame retardancy and electric insulation property.

There are provided a substrate on which a first integrated circuit, a first transistor, a second integrated circuit, and a second transistor are disposed; a heat sink fixed to the substrate; a first heat conductive elastic body which is in contact with the heat sink and the first integrated circuit; a second heat conductive elastic body which is in contact with the heat sink and the first transistor; a third heat conductive elastic body which is in contact with the heat sink and the second integrated circuit; and a fourth heat conductive elastic body which is in contact with the heat sink and the second transistor, the heat sink has a first recess portion positioned between the first heat conductive elastic body and the second heat conductive elastic body, and a second recess portion positioned between the third heat conductive elastic body and the fourth heat conductive elastic body.