| 摘要 |
PURPOSE: An image forming apparatus is provided to reduce the number of beam detect sensors and increase the accuracy of the image registration position of each color. CONSTITUTION: An image forming apparatus includes a plurality of image bearing members, an optical system, a storing portion, and a producing unit. The optical system has a plurality of light emitting elements(101,102) suitable for generating light beams for scanning the image bearing members, a single polygon mirror(103) suitable for deflecting the light beams generated from the plurality of light emitting elements onto the image bearing members, and a beam detector(106) corresponding to at least one of the plurality of image bearing members, and for receiving the light beams scanned by the polygon mirror and producing the first synchronizing signal for recording an image on the relevant image bearing member. The storing portion is suitable for storing therein information regarding the error of each side of the polygon mirror. The producing unit is suitable for producing the second synchronizing signal for recording an image on the image bearing member not provided with the beam detector, by delaying the first synchronizing signal output from the beam detector, on the basis of the value of the storing portion.
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