| 摘要 |
Provided is an optical scanning apparatus in which images are formed precisely on the target surface to be scanned with a plurality of beams and low manufacturing cost is realizes. The optical scanning apparatus comprises four light sources, each of which emits a beam, a collimator lens and a polygon mirror. Provided between the polygon mirror and the target surface, cylindrical mirrors to form images with beams on the respective target surfaces. The optical path, from the polygon mirror to the target surface, of the beams emitted from the light sources away from the optical axis of the collimator lens is shorter than the corresponding optical path of the beams emitted from the light sources close to the optical axis. Thus, even though the collimator lens has the curvature of field, all of the image spots formed with the beams are located just on the target surface.
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