An inkjet printing system includes: an inkjet head including a plurality of nozzles that eject ink; a driver that controls driving of the plurality of nozzles; an impedance converter located between the driver and the inkjet head, the impedance converter having an impedance which varies based on a magnitude of an input voltage provided by the driver; and a self-sensing circuit part connected to an input terminal of the inkjet head and an output terminal of the impedance converter, the self-sensing circuit part measuring a self-sensing voltage for each nozzle.

A liquid ejecting apparatus includes a liquid ejecting head that is provided with a plurality of piezoelectric elements that apply pressure to a liquid in a pressure chamber by being driven, an acquisition section that acquires a simultaneous drive number, which is the number of piezoelectric elements simultaneously driven among the plurality of piezoelectric elements, a determination section that determines a drive signal for driving the piezoelectric elements of the simultaneous drive number by adjusting a timing of changing a potential of the drive signal based on the simultaneous drive number, and a drive signal output section that outputs the drive signal determined by the determination section.

A technique by which deterioration of a heat resistor can be detected more accurately is provided. There are included a printing head configured to eject an ink from a nozzle provided so that the nozzle corresponds to a heat resistor and perform printing by applying a pulse voltage to the heat resistor; an obtaining unit configured to obtain a prediction resistance value of the heat resistor according to a unique value of the heat resistor and a setting value to drive the heat resistor; a measurement unit configured to measure the resistance value of the heat resistor; and a determination unit configured to determine based on the prediction resistance value and the resistance value whether deterioration arises in the heat resistor.

A correction information acquisition step including a correction driving step of supplying a first drive waveform signal to a driving element, a correction switching step of switching a switch circuit such that a residual vibration signal is supplied to a residual vibration detection circuit, a correction information holding step of holding a residual vibration detection signal as correction value information, a determination driving step of supplying a second drive waveform signal to the driving element, a determination switching step of switching the switch circuit such that the residual vibration signal is supplied to the residual vibration detection circuit, a residual vibration acquisition step of acquiring the residual vibration detection signal, and an ejecting section determination step of determining a state of an ejecting section based on a correction detection signal obtained by correcting the residual vibration detection signal obtained in the residual vibration acquisition step with the correction value information.

An ejection state determination method includes a time counting step of acquiring an elapsed time from a time when the previous pre-charging step is executed, a charging time determination step of determining a charging time for storing a charge in a capacitive component of a residual vibration detection circuit according to the elapsed time, a charging step of storing the charge in the capacitive component of the residual vibration detection circuit according to the charging time, a determination driving step of supplying a drive waveform signal as a drive signal to a driving element, a residual vibration acquisition step of acquiring a residual vibration detection signal output by the residual vibration detection circuit after the determination driving step, and an ejecting section determination step of determining a state of an ejecting section based on the residual vibration detection signal acquired in the residual vibration acquisition step.

A liquid ejection head includes a flow path member including a plurality of pressure chambers, an actuator member including a plurality of individual electrodes and a plurality of first contacts, the plurality of first contacts being arranged on an upper surface of the actuator member and connected to the plurality of individual electrodes, respectively, a wiring member including a plurality of wirings, each of the plurality of wirings having a second contact at one end, the second contact being connected to the plurality of first contacts, and a driving member including a plurality of output terminals configured to output a drive signal, each of the plurality of output terminals being connected to another end of the plurality of wirings. At least two of a plurality of the second contacts are connected to one of the plurality of first contacts.

A liquid discharge apparatus includes a head including a first discharge section and a second discharge section, a first drive circuit, a second drive circuit, and a startup control circuit that controls startup of the first drive circuit and the second drive circuit, in which the first drive circuit outputs a signal for stopping output of a head power supply signal from a power supply circuit when the head power supply signal is equal to or lower than a predetermined voltage, the second drive circuit outputs a signal for stopping output of a drive circuit power supply signal from the power supply circuit when the drive circuit power supply signal is equal to or lower than a predetermined voltage, and the startup control circuit starts a startup sequence of the first drive circuit, and then starts a startup sequence of the second drive circuit.

A liquid discharge apparatus including a pressure chamber substrate provided with a pressure chamber communicating with a nozzle through which a liquid is discharged, a diaphragm provided on the pressure chamber substrate, a piezoelectric element provided on the diaphragm and having a piezoelectric layer interposed between two electrodes, and a control section that controls driving of the piezoelectric element, the piezoelectric element being driven by the control section to apply a pressure to liquid in the pressure chamber to discharge the liquid through the nozzle, a compliance value of the piezoelectric element at a minimum voltage which is applied to the piezoelectric element is smaller than a compliance value of the piezoelectric element at a maximum voltage which is applied to the piezoelectric element.

A media processing device including a platen, a printhead configured to form a nip with the platen, a sensor disposed proximate to the printhead, a detector configured to receive a sensor output from the sensor, and a logic circuit. The sensor is configured to be responsive to demarcation features on a media supply as the media supply is advanced along a feed path past the sensor by the platen. The detector is configured detect edges of the demarcation features, and output a detector output based on the detected edges. The logic circuit is configured to receive the detector output from the detector, determine when to print based on the detector output, and control the printhead and the platen to print on the media unit or printable area.

In a liquid ejecting apparatus, a drive circuit that outputs a drive signal includes a modulation circuit that outputs a modulated signal, an amplifier circuit that outputs a first amplified modulated signal obtained by amplifying the modulated signal, a level switching signal output circuit that outputs a level switching signal, a level shift circuit that switches, whether to output, as a second amplified modulated signal, a signal obtained by shifting a reference electrical potential of the first amplified modulated signal or output the first amplified modulated signal as the second amplified modulated signal, and a demodulation circuit that outputs the drive signal obtained by demodulating the second amplified modulated signal. The level switching signal output circuit switches an electrical potential of the level switching signal in accordance with at least one of a waveform information signal or a drive element number information signal.