| 摘要 |
PROBLEM TO BE SOLVED: To provide a curvature adjusting mechanism capable of preventing color shift deterioration without changing an adjustment state of scanning line curvature against disturbance after the adjustment of the scanning line curvature by fixing the relative position relation between a mirror of the scanning line curvature adjusting mechanism and a holding means for the mirror in a main scanning direction. SOLUTION: The curvature adjustment unit including the mirror configured to reflect light deflected by an optical deflecting means deflecting light emitted from a light source in a predetermined direction, a holder means configured to hold the mirror, a support member provided to the holder means to hold the mirror, and a pressure means configured to flexibly deform a reflecting surface of the mirror in a normal direction relative to the reflecting surface is provided with a fixing means fixed to at least a portion of the mirror, configured to abut against at least a position of the holder means including the support member, the relative position between the mirror and holder means in the main scanning direction being fixed. COPYRIGHT: (C)2009,JPO&INPIT
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