| 摘要 |
PROBLEM TO BE SOLVED: To provide an aligner and an image forming device constituted so that scanning with light is performed without causing a vortex on the outer peripheral part of a polygon mirror even when the polygon mirror is rotated at high speed with simple constitution. SOLUTION: The aligner is equipped with the polygon mirror 36 with which a photoreceptor drum 44 is scanned to form a latent image by reflecting and rotating a light beam radiated from a semiconductor laser by reflection surfaces 36a..., and disks 81 and 81 disposed at both side parts of the mirror 36, constituted so that the outer peripheral part is projected from the reflection surfaces 36a... of the mirror 36 and separated to be opposed, and integrally holding external gas in a space part K formed by the opposed surface of the outer peripheral part and the reflection surface 36a of the mirror 36 in rotating. |
