| 摘要 |
An optical scanning apparatus includes a light-shielding member, disposed between an optical deflection unit and a converging lens, for shielding a scanning beam incident on an edge portion of the converging lens on the scanning starting position side, and the apparatus converts a laser beam into a scanning beam by the optical deflection unit and raster-scans a photosensitve material with the scanning beam through the converging lens to form an image on the photosensitive material. The apparatus may further include a deflection mirror with another light-shielding member, disposed between the converging lens and the photosensitive material, for guiding the scanning beam which does not contribute to image formation immediately after starting of the scanning to a scanning beam detection unit. In the optical scanning apparatus, occurrence of a stray light can be prevented owing to the light-shielding member, whereby an image of high quality free from uneveness of an image or blurring of an image can be formed.
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