| 摘要 |
PROBLEM TO BE SOLVED: To precisely correct a sub scanning direction positional shift of an image without incurring high costs. SOLUTION: A light source unit can simultaneously scan two scanning lines (line 1 and line 2), and includes a semiconductor laser which includes nine light emitting units (A, B, C, D, E, F, G, H and I) including a light emitting unit C as the default light source used for scanning with line 1 and a light emitting unit G as the default light source used for scanning with line 2. In scanning, one or two light emitting units are selected from nine light emitting units for the scanning light source for every line according to the amount of the sub scanning direction positional shift, and driven and controlled. Thus, the sub scanning direction positional shift is precisely corrected without incurring high costs. COPYRIGHT: (C)2007,JPO&INPIT
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