| 摘要 |
PROBLEM TO BE SOLVED: To provide an image forming apparatus capable of scanning stably with light rays on a surface to be scanned and forming a high-quality image, at a high speed. SOLUTION: A light beam Bk from a cylinder lens 204a and a light beam Bc from a cylinder lens 204b are set to enter a polygon mirror 104, each being inclined to -Z side relative to a normal line direction RH of a deflecting reflection face of the polygon mirror 104. Also, a light beam Bm from a cylinder lens 204c and a light beam By from a cylinder lens 204d are set to enter the polygon mirror 104 each inclined to +Z side relative to a normal line direction RH of the deflecting reflection face of the polygon mirror 104. In other words, light beams made incident on the -X side and the +Z side of the polygon mirror 104 are inclined opposite to each other, relative to the normal line direction of the polygon mirror 104, at least with respect to a subscanning line. COPYRIGHT: (C)2008,JPO&INPIT
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