A print head includes a piezoelectric element that includes a first electrode supplied with a drive signal and a second electrode supplied with a reference voltage signal and is displaced by a difference in electric potential between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle along with the displacement of the piezoelectric element, a vibration plate that is disposed between the cavity and the piezoelectric element, a gate circuit that is electrically connected to a ground, a first switch circuit that switches between supplying and not supplying the drive signal to the first electrode, and a second switch circuit that switches between electrically connecting and not electrically connecting the gate circuit and the first electrode.

Circuitry for driving a variable capacitive load comprising: a variable capacitive load; a digital control circuit configured to generate a digital drive signal; and a drive circuit configured to convert the digital drive signal into an analogue drive signal, the analogue drive signal forming a drive waveform for charging the variable capacitive load, the drive circuit comprising a slewing circuit configured to drive a time dependent voltage component of the drive waveform; wherein the digital control circuit is configured to modify the digital drive signal for each charging cycle so as to match the time dependent voltage component of the drive waveform to the variable capacitive load.

In a liquid discharge apparatus, a print head includes a supply port to which liquid is supplied; a nozzle plate that includes a nozzle for discharging the liquid; a substrate that includes first side, a second side, a first surface, and a second surface which is different from the first surface; a connector that is provided on the first surface; and an integrated circuit that is provided on the first surface, the substrate is provided between the nozzle plate and the supply port, the connector is provided along the first side, the integrated circuit is provided in a place which is not adjacent to the connector, and a shortest distance between the supply port and the first surface is longer than a shortest distance between the supply port and the second surface.

A liquid discharge apparatus includes a recording head, a drive waveform generating unit, a transmission path, a switching unit, and a switching control unit. The recording head is configured to discharge liquid. The drive waveform generating unit is configured to generate a head drive waveform signal supplied to the recording head. The transmission path includes a plurality of transmission lines forming pairs and is configured to transmit the head drive waveform signal generated by the drive waveform generating unit to the recording head. the switching unit is arranged between the drive waveform generating unit and the transmission path, and is configured to change directions of electric currents in the transmission lines. The switching control unit is configured to control the switching unit in accordance with a change in a load capacity of the recording head.

A liquid ejecting apparatus includes a drive circuit that outputs a drive signal, a piezoelectric element that includes a first electrode to which the drive signal is supplied and a second electrode to which a reference voltage signal is supplied and that is displaced by a potential difference between the first electrode and the second electrode, a cavity that is filled with a liquid ejected from a nozzle according to the displacement of the piezoelectric element, a vibration plate that is provided between the cavity and the piezoelectric element, a detection circuit that detects whether or not a voltage variation of the drive signal is within a predetermined range, and a determination circuit that determines whether or not the drive signal is normal based on a detection result of the detection circuit.

A method of operating a printing device during a power loss event includes, with a power loss protection supply voltage generator coupled to a printhead driving circuit, maintaining a power loss protection supply voltage (V.sub.DD_plp) to the printhead driving circuit until a high voltage power supply (V.sub.PP) to the high voltage devices drops below a threshold voltage.

A liquid ejecting apparatus includes a drive circuit in which a first voltage signal is output from an output terminal, a piezoelectric element that includes a first electrode to which the first voltage signal is supplied and a second electrode to which a second voltage signal is supplied, and a first switch element that is electrically connected to the output terminal and the first electrode. The liquid ejecting apparatus has a first mode in which a voltage value of the second voltage signal is controlled to be a first voltage, and a second mode in which the voltage value of the second voltage signal is controlled to be a second voltage lower than the first voltage, a voltage value of the first voltage signal is controlled to approximate the voltage value of the second voltage signal, and the first switch element is controlled to be turned on.

A drop ejector array device includes a first plurality and a second plurality of drop ejectors that are alternatingly disposed along an array direction on the substrate surface. A voltage input terminal and a current return terminal are disposed on the substrate surface. A first power bus line connects the first plurality to the voltage input terminal. A second power bus line connects the second plurality to the voltage input terminal. The second power bus line is electrically connected to the first power bus line by a primary power bus connector line. A first current return bus line connects the first plurality to the current return terminal. A second current return bus line connects the second plurality to the current return terminal. The second current return bus line is electrically connected to the first current return bus line by a primary current return bus connector line.

A recording element substrate for a liquid ejection head is provided with a storage section including an antifuse element and a first resistor connected in parallel with the antifuse element, and a second resistor that is connected in parallel with the storage section and serves as a reference in rating information of the antifuse element, and a second switch connected to the second resistor.

A system for isolating a failed resistor in a liquid dispensing system including a fusible links described. The system includes drive circuitry to drive a voltage supply to a resistor. The fusible link is disposed between a field effect transistor (FET) and the resistor. The fusible link is to fuse apart upon failure of the resistor.