| 摘要 |
An image forming apparatus includes a first image bearing member, a second image bearing member, a positioning mark forming device configured to form a positioning mark on the second image bearing member, and a positioning mark detecting device configured to detect the positioning park formed on the second image bearing member. A first side visual image formed on the first image bearing member is transferred onto the second image bearing member for transferring from the second image bearing member onto a first side of a recording medium. A second side visual image formed on the first image bearing member is transferred from the first image bearing member onto a second side of the recording medium, so that the first and second side visual images are obtained on the first and second sides of the recording medium, respectively. When forming the first side and second side visual images on the first and second sides of the recording medium, an image forming operation is controlled according to detection of the positioning mark with the positioning mark detecting device such that positions of the first side and second side visual images on the first and second sides of the recording medium coincide with each other.
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