| 摘要 |
PURPOSE:To prevent a color shift and to decrease in the size of structure by detecting a lamp carriage fitted with a light source being displaced through a detctor when the syncrhonizing signal of a transfer drum is generated, and rotating some part of a mirror provided on an optical path and correcting the displacement. CONSTITUTION:When an original 2 is mounted on a platen 1 and copying operation is started, the lamp carriage 3, a photosensitive body 13, a paper feeding device 18, and the transfer drum 20 start operating synchronously, and synchronizing pulses of the transfer drum 20 are generated and inputted to a control system. The control system inputs the position signal of the lamp carriage 3 from a detector 26 to decides on whether the carriage is at a preset position or not when the synchronizing signal is generated; when the carriage is displaced, the extent of the displacement is calculated and a control signal is outputted to the control mechanism 30 of the mirror 12. Consequently, a clear color copy having no color shift is obtained and the displacement of a scanning exposure system is detected to control the angle of incidence to the photosensitive body, so the structure neither becomes complex nor large in size even when a magnification varying mechanism is employed. |
