| 摘要 |
A rotating multi-faceted mirror of an optical scanning apparatus is disclosed having a plurality of planar reflective surfaces that deflect and scan a light beam incident thereon. Edges, formed as a result of the dihedral angle between adjacent planar reflective surfaces, generate eddy currents which, over time, result in dust being deposited in axially centered regions of the planar reflective surfaces that are used to scan an object by rotating the reflective surfaces about an axis. The reflectance of these regions thus deteriorates over time, causing the scanning beam quality to deteriorate over time. In order to prevent the accumulation of dust in these regions, at a part of each edge corresponding to an axially centered region where a light beam is effectively reflected on the reflective surfaces of the rotating multi-faceted mirror, a notch is formed that passes through the adjacent reflective surfaces that form the edge.
|
