| 摘要 |
A polygonal mirror 10 has a mirror body 12, at least one reflection face 18a - 18f formed to side surfaces of the mirror body, and reinforcing ribs 14, 16 integrally formed to both the upper and lower surfaces of the mirror body, respectively. Each of the reinforcing ribs has an outer circumference that is larger than the outer circumference of the mirror body. A through hole 24 for mounting on a drive shaft is shown. <IMAGE>
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