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    • 6. 发明授权
    • Halftone image printing device
    • 半色调图像打印设备
    • US5099259A
    • 1992-03-24
    • US501414
    • 1990-03-22
    • Shuzo HiraharaHitoshi NagatoKazuhiko HiguchiKiyoshi YamadaTadayoshi OhnoTsutomu Kanai
    • Shuzo HiraharaHitoshi NagatoKazuhiko HiguchiKiyoshi YamadaTadayoshi OhnoTsutomu Kanai
    • H04N1/40H04N1/405
    • H04N1/40087H04N1/4058
    • A halftone image printing device for printing an image consisting of picture elements arrayed in a zig-zag fashioning. Each picture element is composed of dots forming a quasi-diamond-shaped matrix. The dot matrix is a 2 (row) x 3 (column) matrix with two additional dots located at the top and bottom, respectively. The range of optical density, within which the densities represented by the picture elements fall, is segmented into sub-ranges. Different heating-resistors are assigned to each sub-range of density. The dots printed by the heating-resistors assigned to any sub-range of density forms a "dot pattern" of a specific shape. The first dot pattern has one dot printed on the upper-central part of the rectangular matrix. The second dot pattern has three dots forming an L-shaped pattern, the first dot printed on the upper-central part of the matrix, the second dot printed above the first dot, and the third dot printed to the right of the first dot. The third dot pattern consists of five dots forming a cross, the first dot printed on the upper-central part of the matrix, the second dot printed above the first dot, the third dot printed to the right of the first dot, the fourth dot printed below the first dot, and the fifth dot printed to the left of the first dot. And the fourth dot pattern consists of five dots forming a cross and an additional dot printed immediately below the cross. Of the dots of each dot pattern, the dot on which energy concentrates more than any other dot assumes the same location for all dot patterns.
    • 一种半色调图像打印装置,用于打印由以之字形排列的图像元素组成的图像。 每个像素由形成准菱形矩阵的点组成。 点阵是分别位于顶部和底部的两个附加点的2(行)×3(列)矩阵。 由图像元素表示的密度落在其中的光密度的范围被分割成子范围。 不同的加热电阻被分配到密度的每个子范围。 由分配给任何密度子范围的加热电阻器印刷的点形成特定形状的“点图案”。 第一个点图案在矩形矩阵的中央上部印有一个点。 第二点图案具有形成L形图案的三个点,第一个点印刷在矩阵的中心上部,第二个点印在第一个点上方,第三个点打印在第一个点的右侧。 第三点图案由形成十字的五个点组成,第一个点印在矩阵的中心上部,第二个点印在第一个点之上,第三个点印在第一个点的右边,第四个点 打印在第一个点下方,第五个点打印在第一个点的左侧。 而第四个点图案由五个点形成一个十字架,另外一个点在十字架的正下方打印出来。 在每个点图案的点中,能量集中于任何其他点的点对于所有点图案都采用相同的位置。