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    • 67. 发明授权
    • Ink jet printing apparatus and ink jet printing method
    • 喷墨打印设备和喷墨打印方法
    • US06834936B2
    • 2004-12-28
    • US10435465
    • 2003-05-12
    • Minoru TeshigawaraNaoji OtsukaKiichiro TakahashiHitoshi NishikoriOsamu Iwasaki
    • Minoru TeshigawaraNaoji OtsukaKiichiro TakahashiHitoshi NishikoriOsamu Iwasaki
    • B41J221
    • B41J19/147
    • Two print heads combined for each ink color are arranged symmetric to each other with respect to the scan direction and are used for a bidirectional printing. In producing secondary colors, image data is spread-processed by using a “diagonal arrangement” spread pattern to differentiate the ink application order at one of dots arranged in the raster direction from those of the other dots and thereby reduce color variations in the scan direction. Further, when image data has a half-tone, a “horizontal arrangement” spread pattern, different from the previous one, is used to perform image processing on the image data to alleviate an undesired texture. To prevent a driving load from concentrating on only one of the paired print heads, the number of times that each nozzle is driven is counted and an adjustment is made to spread the frequency of use among the two paired print heads.
    • 对于每种墨水颜色组合的两个打印头相对于扫描方向彼此对称布置,并用于双向打印。 在生成二次色时,通过使用“对角排列”展开图案来对图像数据进行扩展处理,以便在光栅方向上排列的一个点与其他点的点之间的墨水应用顺序区别开,从而减少扫描方向的颜色变化 。 此外,当图像数据具有半色调时,使用与前一个不同的“水平排列”扩展图案来对图像数据执行图像处理以减轻不期望的纹理。 为了防止驱动负载仅集中在一个打印头中的一个上,对每个喷嘴的驱动次数进行计数,并且进行调整以扩展两个成对的打印头之间的使用频率。