Patent ID: 6328395
Filing Date: 2001-12-11
Classification: B41J,H04N

Abstract:
An ink jet printer comprising:a print head having a plural number of nozzles associated with pressure generating elements;a print controller for driving the print head and controlling the ink ejecting operation of the print head;drive signal generating means for generating a drive signal including, during one period, a plural number of drive pulses for driving the print head to eject ink droplets from each nozzle;print data generating means for generating print data to input one or a plural number of the drive pulses to each pressure generating element during one print period and calculating a decode value which represents waveform elements of said print data, wherein said decode value is calculated from an input gray scale level; andswitching means for inputting the drive signal to each pressure generating element in accordance with the print data, wherein the plural number of drive pulses generated by the drive signal generating means include a first drive pulse for generating a first ink droplet and a second drive pulse for generating a second ink droplet whose weight is different than that of the first ink droplet, and said first ink droplet and said second ink droplet are combined to form a printing dot in at least four levels of gray tone.