Patent ID: 7625057

Claim:
A method for adjusting ejection timing comprising: forming adjustment patterns on a medium by shifting relative ejection timings of liquid droplets from a first nozzle row and a second nozzle row lined up in a direction intersecting a row direction in which nozzles of the first nozzle row and the second nozzle row are lined up, while shifting the first nozzle and the second nozzle in respect to the medium in the intersecting direction of the first nozzle row and the second nozzle row; and determining adjustment amounts of relative ejection timings of the first nozzle row and the second nozzle row based on the adjustment patterns, wherein the adjustment patterns are formed in the intersecting direction in a plural number separated from each other by a predetermined distance, and the ejection timing is adjusted based on an average of the adjustment amounts determined based on the adjustment patterns.