| 摘要 |
PROBLEM TO BE SOLVED: To measure an amount of displacement to be measured, without being affected by a case where displacement different from the displacement to be measured may occur. SOLUTION: In (c) showing a pattern for measuring an amount of displacement, the sub-scanning length of a reference color pattern is extended and, therefore, an output from a detection sensor is the same as that in the case where sub-scanning displacement does not occur. Specifically, the sub-scanning length of the reference color pattern is extended, therefore, even if sub-scanning displacement occurs, an amount of sub-scanning displacement can correctly be calculated with a sensor output that is the same as that in the case where sub-scanning displacement does not occur. Here, an amount of the extension of the sub-scanning length of the reference color pattern is the maximum value of the sub-scanning displacement between two colors considered as a system. COPYRIGHT: (C)2005,JPO&NCIPI
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