A method for reducing instability of a nozzle meniscus of a droplet deposition apparatus. The method includes the steps of receiving first and second data blocks for respective first and second line pixels, receiving a data set of forbidden pixel periods, determining a first jitter delay value based on the forbidden pixel periods, generating first and second print data based on the first and second data blocks, the first print data defining a first holding period and one or more drive pulses and the second print data defining one or more drive pulses; wherein the first and second print data generate first and second actuating element signals that cause an actuating element to eject at least one droplet from a nozzle, wherein the first jitter delay value adjusts a first pixel period, defined by the drive pulses, to fall outside of the forbidden pixel periods to reduce nozzle meniscus instability.

A liquid ejection device includes a liquid supply unit, an array of nozzles arranged in a matrix and through which liquid is ejected, actuators each connected to one of the nozzles, and a circuit configured to output signals to the actuators according to delay times that are predetermined in a matrix corresponding to the matrix of the array. The delay times include (k+l−1) or more different delay times where the matrix thereof has k columns and l rows. The matrix is defined such that a difference of two adjacent delay times in each of column and row directions is an odd multiple of a half cycle of a natural vibration period of the liquid, and between two adjacent columns and rows, two or more different delay time differences exist between each pair of corresponding delay times of the adjacent columns and rows, respectively.

A drive circuit for charging a printhead for ejecting drops of ink is provided, the printhead having a capacitance. The drive circuit comprises a power supply comprising a first connection and a second connection. An inductor is connected to the first connection of the power supply, wherein the inductor is connected to a first drive connection of the printhead to provide a charge path for current to charge the capacitance. The second connection of the power supply is connected to a second drive connection of the printhead. The drive circuit also comprises means for applying a plurality of charging voltage pulses to the inductor to provide a single charge of the capacitance for a single cycle of ink ejection from the printhead. A method of operating the drive circuit is also provided.

A liquid ejection device includes a liquid supply unit, an array of nozzles arranged in a matrix and through which liquid is ejected, actuators each connected to one of the nozzles, and a circuit configured to output signals to the actuators according to delay times that are predetermined in a matrix corresponding to the matrix of the array. The delay times include (k+l−1) or more different delay times where the matrix thereof has k columns and l rows. The matrix is defined such that a difference of two adjacent delay times in each of column and row directions is an odd multiple of a half cycle of a natural vibration period of the liquid, and between two adjacent columns and rows, two or more different delay time differences exist between each pair of corresponding delay times of the adjacent columns and rows, respectively.

Provided is a liquid discharging head including a nozzle discharging a liquid; a chamber plate in which a plurality of pressure chambers are arranged side by side on a first surface side; and a flow path plate having a second surface formed with an opening of a communication flow path, wherein a first region of a partition wall between a first pressure chamber and a second pressure chamber adjacent to each other among the plurality of pressure chambers is constrained by being bonded to the second surface of the flow path plate, and a second region of the partition wall overlaps the opening of the communication flow path in plan view.

A drive circuit for charging a printhead for ejecting drops of ink is provided, the printhead having a capacitance. The drive circuit comprises a power supply comprising a first connection and a second connection. An inductor is connected to the first connection of the power supply, wherein the inductor is connected to a first drive connection of the printhead to provide a charge path for current to charge the capacitance. The second connection of the power supply is connected to a second drive connection of the printhead. The drive circuit also comprises means for applying a plurality of charging voltage pulses to the inductor to provide a single charge of the capacitance for a single cycle of ink ejection from the printhead. A method of operating the drive circuit is also provided.

Provided is a liquid discharging head including: a nozzle discharging a liquid; a pressure chamber row in which a plurality of pressure chambers communicating with the nozzle are arranged side by side along a first axis direction; and a first reservoir and a second reservoir commonly communicating with the plurality of pressure chambers, in which the pressure chamber row includes a first pressure chamber communicating with the first reservoir and a second pressure chamber communicating with the second reservoir, and the liquid discharging head further comprises a communication flow path causing the first pressure chamber and the second pressure chamber to commonly communicate with one nozzle.

A liquid discharge apparatus includes a nozzle plate with nozzles and actuators and a drive controller. First and second nozzles are directly adjacent to each other in a first direction. First and third nozzles are directly adjacent to each other in a second direction. The drive controller is configured to apply a drive signal to first, second, and third actuators corresponding to the first, second, and third nozzles, respectively, during a drive cycle. A difference between a first timing at which the drive signal is applied to the first actuator and a second timing at which the drive signal is applied to the second actuator and a difference between the first timing and a third timing at which the drive signal is applied to the third actuator is an odd number multiple of a half of an inherent vibration cycle of the liquid discharge apparatus.

A liquid ejecting head includes a nozzle, first and second pressure chambers communicating with the nozzle, a first driving element configured to change a pressure in the first pressure chamber, and a second driving element configured to change a pressure in the second pressure chamber. A first flow path length of a flow path from the first pressure chamber to the nozzle is shorter than a second flow path length of a flow path from the second pressure chamber to the nozzle. In a driving method of a liquid ejecting head, at least the first and second driving elements are driven to eject a liquid from the nozzle, and a driving timing of the second driving element is earlier than a driving timing of the first driving element.

In the technology of the present disclosure, multiple nozzles included in a printing head are stably driven while disparity in the usage frequency of each nozzle is suppressed. The dot counter scans the digital halftone data in the X direction and performs accumulation-counting on the pixel value Ixy (the number of printing dots) of each pixel for each address y with the accumulation counter CntCum(y). The signal value Gxy of the corresponding pixel address (x, y) is obtained from the division pattern memory unit. The nozzle selection unit selects the nozzle to be used for forming a printing dot, based on the counted values of the accumulation counter CntCum and the signal value Gxy of the division pattern. Then, the address n of the nozzle memory corresponding to the selected nozzle to form a printing dot is determined.