US Patent 12109807 Liquid discharge apparatus

A liquid discharge apparatus includes a channel member defining a nozzle and a pressure chamber in communication with the nozzle; an actuator which applies pressure to liquid in the pressure chamber, and a controller which applies a drive signal to the actuator. The drive signal includes a rectangular main pulse and a rectangular cancel pulse applied after the main pulse within one discharge period. The actuator is driven by the drive signal in a pull-and-push method to discharge the liquid from the nozzle. If f (kHz) refers to a drive frequency of the drive signal, if Tw (μsec) refers to a time length from a falling edge of the main pulse to a rising edge of the cancel pulse, and if Tc (μsec) refers to a pulse width of the cancel pulse, then the following expression holds: 50≤f≤−11.3×(Tw+Tc)+120.