| 摘要 |
A predetermined relationship has been found between a number of beams and a ratio a between magnifications in an sub scanning direction. During scanning with a small number of beams, the allowable range of magnification ratio becomes comparatively large. During scanning with a large number of beams, the allowable range of magnification ratio is around 1. By setting the magnification ratio a in the sub scanning direction so as to satisfy the aforementioned allowable ranges, printing with less pitch error can be implemented even with a small magnification.
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