| 摘要 |
PROBLEM TO BE SOLVED: To select an appropriate access direction for adjusting a scan line bow and set a plurality of optical paths without involving an increase in a space or an increase in folding mirrors in the laser scanning optical apparatus.SOLUTION: Luminous fluxes emitted from a plurality of light source means enter deflection means 10 at different angles respectively with respect to a deflection plane. A scanning lens having largest power in the sub scanning direction in scanning optical elements is disposed in optical paths of the respective optical fluxes emitted from the plurality of light source means. The scanning lens has a cross-sectional shape asymmetric to the sub scanning direction Z and includes an adjusting mechanism for adjusting the scan line bow by elastic deformation thereof. At least two types of 23y and 23k, and 23m and 23c of the scanning lenses have same shape and have reference seating faces for adjusting the scan line bow at both sides in the sub scanning direction Z. |
