| 摘要 |
An optical scanning device includes a first optical system, including a light source, for directing a light beam, emitted from the light source, to an optical deflector. A second optical system focuses the light beam deflected by the deflector on an effective scanning area of a scanning surface. The light source is continuously kept lit when scanning outside of the effective scanning area. A light shield member is positioned between the deflector and the scanning surface to block at least a portion of the light beam emitted during the period of time when the light source is continuously kept lit when scanning outside of the effective scanning area.
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