| 摘要 |
<p>A laser scanning unit including a polygon mirror which has a plurality of reflecting faces reflecting an incident light onto a predetermined image forming part and is rotatably operated, a first light source scanning a first laser onto the reflecting faces at a predetermined scanning angle with respect to a centring line connecting a rotating axial line of the polygon mirror with a predetermined reference position on the image forming part, a second light source scanning a second laser symmetrical with the first laser with respect to the centring line onto the reflecting faces, a first F-8 lens which is positioned on the first optical path between the image forming part and the polygon mirror, and a second F-¸ lens which is positioned on the second optical path between the image forming part and the polygon mirror, and has an optical characteristic symmetrical with the first F¸ with respect to the centring line.</p> |
