| http://www.w3.org/ns/prov#value | - According to the invention, since the base body of the light-scanning unit is supported by the supporting member penetrating the base body, even when the strength of the light-scanning unit, particularly the base body, is not increased excessively, such deformation as distortion, flexure, torsion, or the like in the optical elements mounted on the base body is reduced, thereby reducing adverse inf
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