A liquid ejecting apparatus includes a drive signal output circuit, a control signal output circuit, a differential signal output circuit, and a head unit, in which the head unit includes an integrated circuit that receives a first drive signal and outputs a second drive signal, and an ejector that ejects liquid from nozzle, and the integrated circuit includes a drive signal input terminal that inputs a first drive signal, a first signal input terminal that inputs a first signal, a second signal input terminal that inputs a second signal, a differential signal receiving circuit that receives the first signal and the second signal, and outputs the control signal, a drive signal selection circuit that outputs the second drive signal based on the control signal and the first drive signal, and a drive signal output terminal that outputs the second drive signal to the ejector.

A liquid ejection apparatus includes a liquid ejection head that ejects a liquid by driving a drive element, a drive signal output circuit that outputs a drive signal for driving the drive element, and a substrate provided with the drive signal output circuit, wherein the drive signal output circuit includes a modulation circuit that modulates an original drive signal to output a modulation signal, an amplifier circuit that amplifies the modulation signal to output an amplified modulation signal, and a demodulation circuit that demodulates the amplified modulation signal to output the drive signal for driving the drive element, and wherein the demodulation circuit is located, on the substrate, between the modulation circuit and the amplifier circuit.

A drive circuit includes a first voltage output circuit coupled to a first terminal and outputting a first voltage signal, a second voltage output circuit coupled to a second terminal and outputting a second voltage signal, and a drive signal output circuit coupled to the first terminal and outputting a drive signal. In a first mode, the second voltage output circuit outputs the second voltage signal and the drive signal output circuit outputs the drive signal whose voltage value varies. In a second mode, the second voltage output circuit outputs the second voltage signal and the drive signal output circuit outputs the drive signal which is constant at a third voltage value. In a third mode, the first voltage output circuit outputs the first voltage signal and the second voltage output circuit outputs the second voltage signal.

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 includes an ejection section that includes a nozzle which ejects a liquid, a pressure chamber which communicates with the nozzle, and a piezoelectric actuator which imparts a pressure fluctuation to the liquid in the pressure chamber, a drive waveform generation section that generates a drive waveform including a non-ejection vibration pulse which, when supplied to the piezoelectric actuator, imparts the pressure fluctuation to the liquid in the pressure chamber such that the liquid is not ejected from the nozzle and a control section that controls supply of the non-ejection vibration pulse to the piezoelectric actuator in accordance with a temperature of the liquid in the pressure chamber.

In the print data for a nozzle of a printer, white dots are replaced by pre-ejection pulses. One or more repetitions of the pre-ejection pulses may be inserted into the print data, depending on the actual print speed of the printer, to determine print speed-dependent print data with which the nozzle is activated to print a print image with high print quality.

A liquid discharge apparatus includes a liquid discharge head to discharge liquid and control circuitry to generate a drive waveform including drive pulses applied to the head. The drive waveform includes a non-discharge pulse not to discharge the liquid and a discharge pulse to discharge the liquid. The non-discharge pulse and the discharge pulse are serial in time in the drive waveform. Td is in a range of Tc−0.2×Tc to Tc+0.45×Tc. Vp1 is in a range of −10% to +10% of Vpp1. Td represents a time interval between the non-discharge pulse and the discharge pulse. Tc represents a natural vibration period of a pressure chamber of the head. Vp1 represents a peak value of the non-discharge pulse. Vpp1 represents a peak value of the non-discharge pulse at which a droplet speed of liquid discharged by the discharge pulse takes a local minimum value.

A liquid discharging apparatus that includes a discharging head for discharging liquid, a driving circuit for generating a driving signal, and a circuit board, in which the driving circuit includes a coil and a capacitor, the circuit board includes a first layer, a second layer, first wiring provided at the first layer, second wiring provided at the second layer, and interlayer wiring, the first wiring couples a first start point and a first end point, and is provided in a circumferential shape, the second wiring couples a second start point and a second end point, and is provided in a circumferential shape, the interlayer wiring electrically couples the first end point and the second start point, the first wiring and the second wiring partially overlap each other, and the first wiring, the second wiring, and the interlayer wiring constitute at least a part of the coil.

A liquid discharging apparatus has: a discharging section that discharges a liquid by being driven by a driving signal; a detecting section that detects vibration caused in the discharging section; and an inspecting section that inspects the discharging state of the liquid in the discharging section according to the result of detection by the detecting section. In a first period, the potential of the driving signal is changed from a first reference potential to another potential and back to the first reference potential. In a second period, the potential of the driving signal is changed from the first reference potential to a second reference potential. In a third period, the detecting section detects vibration caused in the discharging section. In a fourth period, the potential of the driving signal is changed from the second reference potential to another potential and back to the second reference potential.

There is provided an ink jet recording apparatus including an ink jet head and a drive circuit. The ink jet head forms an image on a recording medium in response to a drive signal applied to multiple piezoelectric elements. The drive signal causes multiple pressure chambers corresponding to the multiple piezoelectric elements to expand or to contract in volume and causes ink in the multiple pressure chambers to be discharged from multiple nozzles. The drive circuit generates a drive signal for discharging multiple liquid droplets to one pixel for combining the multiple liquid droplets together and applies the drive signal to each of the multiple piezoelectric elements of the ink jet head. The drive signal includes multiple discharge pulses which make velocities of tips of respective liquid columns substantially same after a predetermined time from starting of ink discharge from the nozzles.