| 摘要 |
Image patterns formed on a sheet of paper changes in correspondence with an input image density. As the input density increases, the image patterns change from the state of FIG. 6(a) through the state of FIG. 6(b)-6(g) to the state of FIG. 6(h). As apparent from the drawings, as the input density increases, the linear patterns will extend in a direction parallel to the sheet conveying direction A. Even when mechanical oscillation occurs in the sheet conveying direction A, no changes in tone will appear. When the input density further increases from the state of FIG. 6(d), the linear patterns will grow both in leftward and rightward directions. Because each dither matrix is elongated in the sheet conveying direction A, the linear patterns will grow in the leftward and rightward directions only after the input density increases to some great value. It is therefore possible to effectively prevent occurrence of jitter.
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