Patent ID: 7661788
Filing Date: 2010-02-16
Classification: B41J

Abstract:
1. A jetting timing determining method for determining jetting timings at which liquid droplets of a liquid are jetted onto a medium from a liquid-droplet jetting head having a first nozzle and a second nozzle which are to jet the liquid droplets concurrently, the method comprising: a forming step for forming a plurality of first images by jetting a first liquid droplet from the first nozzle a plurality of times at a plurality of first timings and jetting a corresponding second liquid droplet from the second nozzle a plurality of times at a plurality of second timings, while delaying the first and second timings with respect to each other by predetermined delay times so that the first images are formed to correspond to the delay times respectively; an evaluation step for performing evaluation of the first images; and a first extraction step for extracting, based on a result of the evaluation step, an optimum delay time, among the delay times, corresponding to an optimum first image among the first images; wherein the delay times include positive and negative values, as well as zero.