Patent ID: 8325212

Claim:
A light scanning device comprising: a light source emitting light; a polygon mirror reflecting the light while rotating; a mirror member having a mirror surface reflecting the light, reflected by the polygon mirror, toward an object to be scanned, the mirror member further having a rear surface opposite the mirror surface; a vibration preventing member attached to the rear surface of the mirror member by adhesive bonding to vary a natural frequency of the mirror member; a housing accommodating the polygon mirror and the mirror member; and a supporting member for supporting the mirror member in the housing; wherein: the mirror member has a rectangular shape that is elongated along a predetermined direction in the housing, and the vibration preventing member is a rectangular flat plate that has a width in a direction perpendicular to the predetermined direction that is shorter than that of the mirror member, and the vibration preventing member is divided into a plurality of pieces to form divided pieces that are attached to the mirror member to adjoin each other in the predetermined direction.