| 摘要 |
A scanning optical device includes a light source having a plurality of light emitting points, a deflector for deflecting a plurality of light beams emitted from the light source, and an optical system for guiding the plurality of light beams emitted from the light source onto a surface to be scanned. In the scanning optical device, a predetermined condition is satisfied among a light emitting interval between the plurality of light emitting points, a tilt angle of the plurality of light emitting points, juxtaposed in the main scanning direction, and inclined in the sub scanning direction about the optical axis as the center, the beam interval of the plurality of light beams on the surface to be scanned, and imaging magnifications of the optical system in the main and sub scanning directions.
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