Patent ID: 8456726

Claim:
A light scanning device which scans a plurality of scanned faces by a light beam, comprising: a light source unit which emits a plurality of light beams including a first light beam and a second light beam having different polarization directions to each other; a beam splitter which splits each of the first light beam and the second light beam emitted from the light source unit into, respectively, split first light beams that are split from the first light beam and split second light beams that are split from the second light beam; an incident optical system which allows each of the split first light beams to be incident with an angular difference to each other, and allows each of the split second light beams to be incident with an angular difference to each other; a deflector which respectively deflects each of the split first light beams and each of the split second light beams entered from the incident optical system; and a scanning optical system, including a polarization splitting device for splitting a plurality of the light beams deflected by the deflector based on a difference in a polarization direction, which individually focuses each of the plurality of the light beams split by the polarization splitting device on a corresponding scanned face, wherein when the split first light beams and the split second light beams are incident on a plane of the deflector that is vertical to a rotational axis of the deflector, respectively, each of the split first light beams is incident with an angular difference to each other, and each of the split second light beams is incident with an angular difference to each other.