| 摘要 |
An optical scanning device includes a light source, a deflector, a scanning optical system, a BD sensor, and a half-silvered mirror. The light source emits a light beam. The deflector deflects a light beam emitted from the light source. The scanning optical system includes a scan lens and causes the deflected light beam to form an image on a photosensitive surface. The BD sensor detects a light beam. The half-silvered mirror splits the light beam into a first beam and a second beam. The first beam passes through the scan lens to enter the photosensitive surface. The second beam enters the BD sensor. |
