| 摘要 |
PURPOSE:To provide a rotary polygon mirror in which accurately a reflecting surface is remarkably improved. CONSTITUTION:A rotary polygon mirror is manufactured by using a polygon mirror manufacturing apparatus 90 which has an upper surface forming mold 1 for forming an upper surface of the mirror, a lower surface forming mold 3 for forming a lower surface of the mirror, a reflecting surface forming mold 5 for forming a reflecting surface of the mirror, a compressing piston 7 having a resin pressing surface 6 for specifically pressing melted resin 80 injected in the molds to a reflecting surface forming part 5a side of the mold 5, and a central mold 8 for hold the piston 7 in a position movable manner. |
