| 摘要 |
A gradation printer feeds heat-sensitive paper at a constant speed and varies the heating time and hence, the coloring area depending upon printing dots, thereby representing a shading pattern by a multiplicity of printing dots having different densities. If the number of density degradations is N, and the heating time for producing the coloring area of the maximum density gradation is T, the heating time for producing a coloring area which corresponds to each density gradation is obtained by multiplying T/(N-1) by an integer, and the heating times which correspond to the respective density gradations are arranged at substantially regular intervals with the time T/2 as the center, the time T/2 being the point at which T/2 has elapsed from the start of the heating time T.
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