POLYGON MIRROR, IMAGE FORMING APPARATUS, AND METHOD FOR MANUFACTURING A POLYGON MIRROR

摘要

A polygon mirror made of plastic is provided. The polygon mirror has a plurality of reflecting surfaces, a first surface intersecting the plurality of reflecting surfaces at a first side, a second surface intersecting the plurality of reflecting surfaces at a second side opposite to the first side, with a through hole provided to extend through the first surface and the second surface at a center of the polygon mirror. The polygon mirror includes a plurality of gate marks of injection molding. When viewed from an extending direction of the through hole, the gate marks are located on straight lines passing through the center and vertices of the first surface, and are rotationally symmetric with respect to the center.

主权项

1. A polygon mirror made of plastic, the polygon mirror having a plurality of reflecting surfaces, and a first surface intersecting the plurality of reflecting surfaces at a first side, a second surface intersecting the plurality of reflecting surfaces at a second side opposite to the first side, the second surface facing away from the first surface, with a through hole provided to extend through the first surface and the second surface at a center of the polygon mirror, the polygon mirror comprising:
a plurality of gate marks of injection molding, wherein the gate marks are located on straight lines passing through the center and vertices of the first surface, and are rotationally symmetric with respect to the center, when viewed from an extending direction of the through hole.