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 discharge apparatus includes an actuator and a drive circuit. The actuator is configured to cause liquid to be discharged from a nozzle corresponding thereto. The drive circuit is configured to apply a wake waveform to the actuator such that a voltage of the actuator increases to a first voltage and then is maintained at the first voltage without discharge of liquid from the nozzle. A drive waveform is then applied to the actuator for each of one or more discharge cycles such that liquid is discharged from the nozzle for each of the discharge cycles. A time from when the wave waveform starts to be applied to the actuator to when the drive waveform starts to be applied to the actuator is equal to or longer than a period of time of two discharge cycles.

A driving circuit generating a driving signal, includes a modulator generating a modulated signal by performing pulse modulation on a signal specifying a waveform of the driving signal, an amplifier generating an amplified signal by amplifying the modulated signal, and a smoothing section generating the driving signal by smoothing the amplified signal. The amplifier includes first and second transistors coupled in series between a voltage line to which a voltage which is higher than a ground voltage is supplied and a grounding conductor to which the ground voltage is supplied, and a third transistor having a drain electrode coupled to a gate electrode of the second transistor and a source electrode coupled to the grounding conductor. The first and second transistors are exclusively set to an On state in accordance with the modulated signal, and the amplified signal is output from a node which couples the first and second transistors.

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 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, and a driving step of applying the drive pulse to the drive element. The drive pulse includes a first potential, a second potential different from the first potential, and a third potential different from the first potential and the second potential. The second potential is to be applied after the first potential, and the third potential is to be applied after the second potential. In the present liquid discharge method, in the driving step, the drive pulse in which a potential change rate during a change from the first potential to the second potential varies depending on the recording condition acquired in the acquisition step is applied to the drive element.

A head unit comprising: a first line through which a driving signal is supplied; a first discharging section that has a first piezoelectric element having a first electrode, the first discharging section discharging liquid according to the displacement of the first piezoelectric element, the displacement being caused when the driving signal is supplied to the first electrode; a detection circuit that detects the potential of a second line; a first switch that makes a switchover as to whether to electrically couple the first electrode and first line together; a second switch that makes a switchover as to whether to electrically couple the first electrode and second line together; a third switch that makes a switchover as to whether to electrically couple the first line and second line together; and a first resistor provided in series with the third switch between the first line and the second line.

A liquid discharge head includes: a channel substrate having a nozzle and a channel communicating with the nozzle; a driving element arranged on the channel substrate; and a driving signal generating circuit which generates a driving signal to drive the driving element. The driving signal includes a non-discharge driving signal by which the driving element is driven so that liquid in the channel is not discharged from the nozzle. The non-discharge driving signal includes at least one first slight-vibration waveform and at least one second slight-vibration waveform. The first slight-vibration waveform is a waveform by which the driving element is displaced by a first displacement amount. The second slight-vibration waveform is a waveform by which the driving element is displaced by a second displacement amount that is larger than the first displacement amount. The at least one second slight-vibration waveform follows after the at least one first slight-vibration waveform.

A print head includes: an integrated circuit apparatus that switches whether or not to supply drive signals to a plurality of piezoelectric elements, and includes a first circuit block that switches whether or not to supply the drive signal, a second circuit block that switches whether or not to supply the drive signal, a third circuit block that switches whether or not to supply the drive signal, a fourth circuit block, and a first buffer area, a second buffer area, and a third buffer area in which no circuit element is located, in which the first buffer area is located between the first circuit block and the fourth circuit block, the second buffer area is located between the second circuit block and the fourth circuit block, and the third buffer area is located between the third circuit block and the fourth circuit block.

An inkjet printing apparatus adopting short pulse heating is designed to output a uniform image without unevenness. To this end, in a serial inkjet printing apparatus, a print head is subjected to a short pulse heating treatment before each print scan is carried out. In a case where a print medium is a first print medium, the print head is heated to a first target temperature before carrying out each of the print scans. In a case where the print medium is a second print medium, the print head is heated to a second target temperature lower than the first target temperature before carrying out each of the print scans.

A printing apparatus includes a medium accommodation portion that accommodates a medium, a medium discharge port for discharging the medium, a medium transport section that transports the medium, an ejection head that ejects a liquid to the medium to form an image, and an image detection section that detects the image. The printing apparatus has a first mode and a second mode, the first mode being a mode in which the medium transport section transports the medium in a direction from the medium accommodation portion toward the medium discharge port, and the ejection head ejects the liquid to the medium, and the second mode being a mode in which the medium transport section transports the medium in a direction from the medium discharge port toward the medium accommodation portion, and the image detection section detects image information of the image formed on the medium.