PROBLEM TO BE SOLVED: To obtain an optical scanning device in which the deterioration of image quality is prevented, by fixing a light source driving pattern having a large number of divisions for main-scanning-position error correction of a designed central value, and correcting only the main scanning positional error due to the variation in the tolerance, by referring to a variable table having a small number of divisions, and to provide an image forming apparatus.
SOLUTION: The optical scanning device includes: a deflection unit 106, which scanningly deflects a luminous flux from a light source by sine oscillation; a surface to be scanned by the deflected luminous flux; a first main-scanning-position error correction unit 402, which divides the face to be scanned by a first division number in a main scanning direction, individually setting a clock pulse timing for every divided region of the first division number, and corrects the main-scanning-position error; and a second main-scanning-position error correction unit 401, which divides the face to be scanned by a second division number in the main scanning direction, individually setting the clock pulse timing for each divided region of the second division number, and corrects the main-scanning position error, on the basis of the first main-scanning position correction data.
COPYRIGHT: (C)2010,JPO&INPIT