| 摘要 |
An optical scanning device including a semiconductor laser and a scanning optical system which transmits a laser beam emitted from the semiconductor laser and scans the laser beam on a photosensitive drum. The scanning optical system includes at least one hologram having relief on at least one surface with the ratio h/P of the depth h and the minimum pitch P of the relief being set to about 1 or less in an area of the hologram surface the laser beam irradiates.
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