| 摘要 |
A laser scanning apparatus has a light source device for emitting a laser beam, a deflector for deflecting the laser beam so as to scan a scanned surface with the laser beam, and a scanning optical system disposed in the optical path of the laser beam so as to focus the laser beam on the scanned surface. The scanning optical system is composed of three or more lens elements, of which the lens element disposed closest to the deflector and the lens element disposed closest to the scanned surface each have a surface that is so shaped that the curvature thereof as viewed on a sectional plane along the sub scanning direction varies independently of the shape thereof in the main scanning direction.
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