| 摘要 |
Forming an image by utilizing a scanning device for scanning a color image for each color element, a reading device for reading image data for each scanned line, a rotary polygon mirror for deflecting, in a main scan direction, a modulated light beam that is based on the image data for each read line, so that an image holding member that is rotated in a sub-scan direction is scanned by the deflected light beam and a latent image is formed thereon, a first generation device for determining whether the light beam deflected by the rotary polygon mirror has scanned a predetermined location, and for generating a main scan start reference signal, and a second generation device for generating a sub-scan start reference signal in synchronization with the rotation of the image holding member, a first control device that controls the rotary polygon mirror and the rotary image holding member, so as to maintain a phase difference between the sub-scan start reference signal and the main scan start reference signal, no matter how many times the rotary image holding member is rotated, a second control device, in synchronization with the sub-scan start reference signal, which starts to drive the scanning device, a third control device, in synchronization with the main scan start reference signal, starts the reading of an original document by the reading device, and a fourth control device, in synchronization with the main scan start reference signal, starts to use the light beam to form a latent image.
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