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    • 61. 发明授权
    • Ink jet printing method and ink jet printing system
    • 喷墨打印方法和喷墨打印系统
    • US07198345B2
    • 2007-04-03
    • US10986816
    • 2004-11-15
    • Tsuyoshi ShibataYasunori Fujimoto
    • Tsuyoshi ShibataYasunori Fujimoto
    • B41J2/205
    • B41J2/2132
    • In an ink jet printing apparatus that adopts an area grayscale system using halftone elements, degradation of grayscale reproducibility caused by a plurality of dots pulling each other on a print medium can be prevented, and thereby stable grayscale and color reproducibility can be realized. To this end dots to be applied to halftone elements, whose arrangement is determined by the halftone element-based area grayscale system, are divided into a dot group for interior halftone elements and a dot group for outline halftone elements. These two dot groups are printed with a predetermined time difference between them. The subsequent dots are then drawn to the preceding dots that are not yet absorbed in the print medium. Therefore, the overall shape and grayscale level of the merged dot in each pixel become stable, allowing for reliable image processing which in turn realizes excellent grayscale and color reproducibility.
    • 在采用使用半色调元件的区域灰度系统的喷墨打印装置中,可以防止由打印介质上相互牵引的多个点引起的灰度再现性的降低,从而可以实现稳定的灰度和颜色再现性。 为此,应用于由半色调元件基区域灰度系统确定的半色调元件的点被分成用于内部半色调元件的点组和用于轮廓半色调元素的点组。 这两个点组之间印有预定的时间差。 随后的点被绘制到尚未在打印介质中吸收的先前点。 因此,每个像素中的合并点的整体形状和灰度级别变得稳定,从而可以进行可靠的图像处理,从而实现优异的灰度和色彩再现性。