| 摘要 |
A laser beam that is emitted from a light source is reflected by a first mirror, and then incident on each facet of a polygon mirror. The laser beam is moved for scanning in the fast scan direction by the facet, and reflected again by the first mirror. Since the laser beam is reflected two times by the first mirror, the first mirror may be located close to the polygon mirror, and hence the optical scanning device may be reduced in the size thereof. The incident angle of the incident light beam projected onto the polygon mirror and the reflecting angle of the reflecting light beam reflected by the polygon mirror, may be small. This fact leads to little curving of the scanning line.
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