A liquid discharge substrate according to an embodiment of the present invention includes a plurality of heating elements, a plurality of driving elements, a signal supplying unit which supplies a control signal used to control the plurality of driving elements, and a plurality of delay circuits which delay the control signal. A delay amount of a first delay circuit is different from a delay amount of a second delay circuit.

An inkjet head comprises a pressure chamber into which ink is filled, a nozzle connected with the pressure chamber, an actuator which changes volume of the inside of the pressure chamber to eject an ink droplet from the nozzle connected with the pressure chamber, and a drive circuit which outputs a drive signal which contains an expansion pulse for increasing the volume of the pressure chamber and a contraction pulse for decreasing the volume of the pressure chamber when an ink droplet is ejected and outputs a precursor signal for changing the volume of the pressure chamber to a level at which the ink droplet is not ejected from the nozzle at the time of a precursor minute vibration for minutely vibrating ink.

A printing device includes: a head including an ejection unit that ejects a liquid; a print position changing unit that changes a positional relationship between a medium and the head; a signal output unit that selectively outputs, to a drive element, a drive signal for ejecting the liquid; and a control unit that controls the print position changing unit and the signal output unit to control the ejection of the liquid. At an on-edge part where a dot-forming pixel comes next to a non-dot-forming pixel, the drive signal at a position corresponding to the non-dot-forming pixel is set to be a drive signal smaller than a signal corresponding to a maximum ejection capability that can be achieved at the dot-forming pixel and larger than a signal at the non-dot-forming pixel, and is thus output to the drive element.

A liquid ejection head includes a nozzle, a pressure chamber that is capable of storing liquid and communicates with the nozzle, a volume of the chamber being variable to eject the liquid from the nozzle, an actuator configured to vary the volume in response to a drive signal, and a drive circuit configured to generate the signal. The chamber has one of states including a steady state in which the volume is unchanged, an expanded state in which the volume is expanded, a first contracted state in which the volume is contracted, and a second contracted state in which the volume is further contracted. The drive signal comprises a first waveform for transitioning from the steady state to the first contracted state, a second waveform for transitioning from the first to second contracted states, and a third waveform for transitioning from the second contracted state to the steady state.

A liquid ejection head includes a nozzle, a pressure chamber that is capable of storing liquid and communicates with the nozzle, a volume of the pressure chamber being varied to eject the liquid from the nozzle, an actuator configured to vary the volume of the pressure chamber in response to a drive signal, and a drive circuit configured to generate the drive signal. The pressure chamber has one of states including: a steady state in which the volume is unchanged, an expanded state in which the volume is expanded, and a contracted state in which the volume is contracted. The drive signal includes first through fourth waveforms. A duration of the fourth waveform is shorter than a duration of the third waveform, and is at least 1 s or 0.5 times a half cycle of a main acoustic resonance frequency of the liquid in the pressure chamber.

A liquid ejecting apparatus includes: a liquid ejecting head including a nozzle that ejects liquid, a pressure chamber, and a piezoelectric body that applies pressure to the liquid in the pressure chamber to eject the liquid from the nozzle; a voltage application circuit configured to apply a voltage to the piezoelectric body; and an acquisition section configured to acquire a degree of deterioration of the piezoelectric body, based on information regarding an integral value of a current generated when the voltage applied to the piezoelectric body is gradually changed from a first voltage to a second voltage.