| 摘要 |
PURPOSE:To correct the imaging magnifications differing in the scanning direction of a rotary reflecting mirror and in the direction orthogonal to this and project the images so as to be formed at the same imaging magnification in both direction by providing at least one anamorphotic optical system. CONSTITUTION:Light emitting from the first plane 6 positioned on the focal plane of the first imaging optical system 7 of rotation symmetry passes through the first imaging optical system 7 to become parallel luminous fluxes which are then deflected by a rotary reflecting mirror 8 and are proejcted onto the second plane 11 disposed to the imaging position of the second imaging optical system 10 of the rotation symmetry. Since an anamorphotic variable power lens group 9 is disposed on the optical paths between the rotary reflecting mirror 8 and the second imaging lens group 10, the change rates vary in the scanning direction and in the direction orthogonal to this, from which the distortions of the image formed on the second plane 11 may be corrected. |
