Patent ID: 8960831
Filing Date: 2015-02-24
Classification: B41J

Abstract:
1. An inkjet head comprising: a pressure chamber for storing and pressurizing ink; an actuator for changing the volume of the pressure chamber according to a discharging waveform; a nozzle for discharging ink stored inside the pressure chamber when the volume of the pressure chamber is decreased by the actuator in response to a discharge cycle in the discharging waveform; a temperature sensor for detecting a temperature of the ink; and a controller for providing the discharging waveform for controlling the actuator; wherein: the controller sets a number of the discharge cycles in the discharging waveform to a first number based on a gradation value of a pixel to be printed when an elapsed time interval between the discharging of ink is less than a first specified time interval, the controller sets the number of discharge cycles in the discharging waveform to a second number greater than the first number when the elapsed time interval between the discharging of ink is greater than the first specified time interval, and the first specified time interval is set to be more than a reference time interval if the detected temperature of the ink is more than a reference temperature, and the first specified time interval is set to be less than the reference time interval if the detected temperature of the ink is less than the reference temperature.