| 摘要 |
An image forming apparatus and its control method are provided to perform an aligning operation of a color image simply in printing the color image. When a laser scanning unit outputs a laser beam as a horizontal synchronization signal, a PSD(Position Sensing Detector)(10) receives the laser beam, amplifies two output currents(Y1,Y2) with a proper level, and provides the same to an A/D converter(21). The A/D converter converts the two amplified output currents into digital converts and provides the same to a synchronization signal detecting unit(22) and a synchronization start position signal detecting unit(23). The synchronization signal detecting unit detects a horizontal synchronization signal(H_sync1) by using the two output currents and provides the same to a video controller(25). The video controller provides video data(VDO) to the laser scanning unit. A position deviation detecting unit(24) detects a position deviation between a start position of a previous horizontal synchronization signal and a start position of a current horizontal synchronization signal, and provides the same to the video controller.
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