Patent ID: 8632149
Filing Date: 2014-01-21
Classification: B41J

Abstract:
1. A method of ejecting ink droplets to produce gradations of gray levels in a printed image, comprising: providing a printhead operable to eject liquid drops having a plurality of drop volumes, the printhead including a plurality of nozzles of different nozzle sizes through which the liquid drops are ejected toward a pixel location, the plurality of nozzles including a first nozzle and a second nozzle, the size of the first nozzle being smaller when compared to the size of the second nozzle, a smallest liquid drop volume ejected from the first nozzle being a minimum drop volume V forming the printed image with gradations of gray levels by ejecting liquid drops through the first nozzle and the second nozzle of the printhead toward the same pixel location, wherein an increment between a first total amount of ink and a next larger total amount of ink deposited on the pixel location is less than V