| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To accurately detect toner images for correction despite an inexpensive configuration. <P>SOLUTION: The emitting range P of a light emitting element 16a in a main scanning direction on a transfer belt 5 is detected in advance. In a position coinciding with the emitting range P of the light emitting element 16a in the main scanning direction, the toner images for correction TMn<SB>Y</SB>, TMn<SB>C</SB>, TMn<SB>M</SB>, and TMn<SB>K</SB>(second position correcting pattern) are formed in a size not larger than the light receiving area W of a light receiving element 16b. This reduces the components of diffusing reflection light, making it possible to suppress detection errors in the toner images for correction TMn<SB>Y</SB>, TMn<SB>C</SB>, and TMn<SB>M</SB>in their respective colors. Consequently, the calculation of the amount of shift in a shift correcting device is not affected by spot deviation and degradation in the accuracy in shift correction can be prevented. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
