| 摘要 |
<p>PURPOSE:To prevent the partial omission of a mark or image, by providing a means for prohibiting the writing of the next data when the address of a coordinates conversion address generator does not step and the writing of the image data to memory was detected. CONSTITUTION:In a mark signal generator 26 for allowing a sub-memory 31 to store the mark signal outputted from a preset counter 27 according to the output of a coordinates conversion address generator 22B, a non-stepping detection means 41 for detecting that the address of the coordinates conversion address generator 22B was not stepped is provided. Further, a writing detection means 41 for detecting that image data is written in the sub-memory 31 is provided and a writing prohibiting means 43 operated when the detection signals of the non-stepping detection means 41 and the writing detection means 42 are simultaneously obtained is provided to prohibit that the next image data is written in the sub-memory 31.</p> |
