Patent ID: 7245409
Filing Date: 2007-07-17
Classification: G02B

Abstract:
1. A scanner apparatus for scanning an image forming area with a light beam, comprising: a polygon minor with a plurality of reflective surfaces for directing a light beam reflected thereby to the image forming area, and scanning the light beam in a scannable area wider than the image forming area in a main scanning direction by rotating on its rotation axis; a plurality of light beam emitting units for emitting light beams to the reflective surfaces from directions that cross a center line in the main scanning direction of the image forming area and are point symmetrical to each other with respect to the rotation axis of said polygon minor; and a plurality of fθ lenses for scanning the light beams at equal speed in the image forming area, said fθ lenses being disposed so that their lens center positions through which the light beams directed to a center position in the main scanning direction of the scannable area pass are displaced in mutually opposite directions from and equidistant from the center line in the main scanning direction of the image forming area, wherein the image forming area is set so that the center line in the main scanning direction of the image forming area passes through the rotation axis of said polygon mirror.