| 摘要 |
PURPOSE:To eliminate a magnification error and distortion by controlling the rotation angle of a flat mirror, and at least shifting the scanning position of an image forming medium in accordance with the rotation angle of the flat mirror. CONSTITUTION:The end part of the supporting shaft 75 of a roller 71 is made to abut on the cam surface of a cam 80 from the upper part, and a synchronizing belt 83 is bent to be laid between a pulley 82 fixed on the end part of a cam shaft 81 and the output pulley 32 of a motor 30. Then, when the motor 30 is turned on, the cam 80 is rotated in a direction shown by an arrow A, and the scanning position is shifted in accordance with the up-and-down movement of the roller 71. The shape of the cam surface of the cam 80 is formed so that the shifting amount may correspond to an outgoing angle, and the rotation angle of the mirror and also the scanning position can be controlled by rotating the motor 30. |
