| 摘要 |
An image forming apparatus is configured to develop a latent image corresponding to a line-like image of a predetermined pitch on photosensitive bodies provided for respective colors for a color image formation and rotatable about a predetermined axis and transfer the developed image to a transfer belt. The apparatus detects the presence or absence of any line from the transferred line-like image for respective colors and calculates a phase displacement, from a phase of a reference photosensitive drum, of the phases of the other photosensitive drums on the basis of waveforms calculated from the detected line pitches for respective colors. The apparatus adjusts the rotation positions of these other photosensitive drums to allow the phases of these other photosensitive bodies to be substantially matched to the phase of that given photosensitive body.
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