Patent ID: 7164517

Claim:
A light scanning device comprising: a light source that generates light for exposing a photoconductor; a deflection device that deflects the light generated by the light source and that scans the light in a main scanning direction; and an imaging device that forms an image of the light generated by the deflection device on the photoconductor; wherein the imaging device includes; a first lens having a first incidence surface on which light is incident, and a first emergence surface from which the light incident on the first incidence surface emerges; and a second lens having a second incidence surface on which light is incident, and a second emergence surface from which the light incident on the second incidence surface emerges, wherein one of the first incidence surface and the first emergence surface is an aspherical surface rotationally symmetrical with respect to an optical axis, wherein the other of the first incidence surface and the first emergence surface has a shape asymmetrical in the main scanning direction with respect to the optical axis and having a curvature asymmetrically variable in the sub scanning direction with respect to the optical axis, and wherein the second incidence surface and the second emergence surface has a shape symmetrical in the main scanning direction with respect to the optical axis and has a curvature symmetrically variable in the sub scanning direction with respect to the optical axis.