| 摘要 |
PURPOSE:To easily correct a bend of a scanning line in a degree at which no influence is given to the picture quality within an extent in which the cost is not increased by fixing a specific lens after the lens is deflected in the auxiliary scanning direction. CONSTITUTION:After the lens which has a magnification in Y-Y direction perpendicular to the scanning direction X-X of a luminous flux deflected by an optical deflector 3 and has the lens surface which is the maximum in magnification among lenses 2, 51, and 52 of the 1st and 2nd image forming systems is deflected in the auxiliary direction, the lens is fixed for correcting a bend of a scanning line. For example, a line image formed on the reflecting surface 4 of the deflector 3 by means of a cylindrical lens 2 of the 1st image forming optical system forms a point image on the image surface 7 of a medium to be scanned when the line image is emitted through of lens 51 and 52 of the 2nd image forming optical system and scanned along a straight line 8 in accordance with the rotation of the deflector 3 in the direction shown by the arrow. Therefore, a bend of a scanning line can be corrected easily in a degree at which no influence is given to the picture quality within an extent in which the cost is not increased. |
