| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain both the formation of one set of deviation detection patterns necessary for maintaining color misalignment correction accuracy equivalent to that of the conventional and speeding-up of a normal image output processing. <P>SOLUTION: One set of patterns PA1 to PA7 is formed on a transfer belt 6 so as to detect the color misalignment, then a change in the pattern (overlapping degree of a reference color and a color as the object to be detected) is read. In the present invention, the recording images IP1 to IP7 required by a user are formed on the transfer belt 6, and, the one set of patterns is divided and formed one by one, in a paper-to-paper space formed between the recording images. The paper-to-paper spaces are read by an optical sensor 11 seven times; and when attaining the reading values of the one set of patterns PA1 to PA7, color misalignment amount calculating processing is performed, based on information showing the overlapping degree of the read reference color and other colors as the objects to be detected shifted by four dots, then the color misalignment is corrected based on the calculation result. The image output delay will not arise, as compared with a conventional system of continuously forming one set of patterns, since the patterns are divided, while using the paper-to-paper space. <P>COPYRIGHT: (C)2007,JPO&INPIT |
