Patent ID: 8368736

Claim:
An optical scanning device that deflects, by using a deflector, a first beam of light polarized in a given direction and a second beam of light polarized in a direction perpendicular to the given direction and guides each of the first beam of light and the second beam of light to a corresponding surface to be scanned by using an optical scanning system so that each light forms an image on the corresponding surface, wherein the optical scanning system includes: a first scanning lens that is arranged on an optical path along which light travels after being deflected by the deflector, wherein the first scanning lens is made of glass; a second scanning lens that is arranged on an optical path along which light travels after passing through the first scanning lens, wherein the second scanning lens is made of resin; and a polarized light splitter that is arranged on an optical path along which light travels after passing through the second scanning lens, wherein the polarized light splitter allows the first beam of light to pass therethrough and reflects the second beam of light, wherein a distance between a light output surface of the first scanning lens and a light input surface of the second scanning lens is longer than a distance between a light output surface of the second scanning lens and a light input surface of the polarized light splitter.