| 摘要 |
PURPOSE:To correcting a scanning line into a straight line which extends in a main scanning direction with a simple constitiution when the scanning line formed on a scanned surface with a laser beam is bent by providing a displacing means which displaces a transparent plate in a rotational direction around an axis parallel to the main scanning direction and a scanning line position correction means which displaces the laser beam scanning position in the subscanning direction. CONSTITUTION:The displacing means 24 which displaces the transparent plate 21 in the rotational direction around the axis extending in the main scanning direction is formed with a supporting member 20 and a holder 22. Further, a projection part 27 is provided fixedly on both sides of a casing 12, a supporting body 26 is held on the projection part 27 movably in the subscanning direction and also freely fixedly at an optional position with screws 28, and a moving means 25 displaces the laser beam scanning position on the scanned surface 11a in the subscanning direction. Consequently, the scanning line can be made into the straight line extending in the scanning direction at a specitic position. |
