| 摘要 |
<p>Disclosed are an ink-jet printing method and apparatus for jetting ink successively from nozzles (1-1,1-2) of an ink-jet head at a prescribed frequency and forming each of a number of pixels by a plurality of dots conforming to the tone of the pixel. Each nozzle (1-1,1-2) of the ink-jet head has a heater A (607,611) and a heater B (609,613). Printing is performed by changing the number of heaters actuated to jet an ink drop, thereby to control the formation of a large or small dot by each nozzle (1-1,1-2), and by changing the method of driving the heaters A (607,611) and B (609,613) in dependence upon the density of the ink used. In regard to the timings at which the large and small dots are formed by each nozzle (1-1,1-2), the small dot is formed first. As a result, the large and small dots can be made to overlap so that an image having excellent tone reproducibility can be printed. <IMAGE></p> |
