| 摘要 |
PROBLEM TO BE SOLVED: To provide a multi-beam optical scanning device which enables a uniform scan line pitch and high precision image, and an image forming apparatus using the same. SOLUTION: The multi-beam optical scanning device includes a light source having plural light emitting members, a rotary polygonal mirror having a deflecting surface, a first optical system for imaging a light beam on the deflecting surface and a second optical system for imaging the light beam on a scan surface to be scanned, wherein the optical axis of the first optical system is disposed at a particular angle in a sub-scan section with respect to a plane perpendicular to the deflection axis of the deflecting surface, and wherein, with respect to the imaging magnification in the sub-scan section of the second optical system on the optical axis and between the deflecting surface and the scan surface, the imaging magnification at a scan start side is made large while the imaging magnification at the scan end side is made small or, alternatively, the imaging magnification at a scan start side is made small while the imaging magnification at the scan end side is made large. COPYRIGHT: (C)2009,JPO&INPIT
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