Light deflector, method of manufacturing the same, optical scanning device, and image-forming apparatus

摘要

A light deflector is disclosed that includes a rotary body supported by a dynamic pressure bearing and rotated by a motor. The rotary body includes a sleeve having a dynamic pressure bearing surface formed on the interior circumferential surface thereof; a flange fixed to the exterior circumferential surface of the sleeve; a polygon mirror press-fitted and fixed to the flange; and a permanent magnet for driving. A substantially cup-like hollow is formed inside the polygon mirror. The polygon mirror is fixed to the flange with the pressure bearing surface formed on the sleeve overlapping at least part of a reflection surface formed on the polygon mirror at a position in a direction of a rotation axis.