US 12,346,039 B2
Rotatable polygon mirror, optical deflector, scanning optical device, and image forming apparatus
Hisanori Kobayashi, Kanagawa (JP); Yoshihiko Tanaka, Shizuoka (JP); Takatoshi Tanaka, Shizuoka (JP); and Naoki Matsushita, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 5, 2023, as Appl. No. 18/460,832.
Claims priority of application No. 2022-159268 (JP), filed on Oct. 3, 2022.
Prior Publication US 2024/0111225 A1, Apr. 4, 2024
Int. Cl. G03G 15/04 (2006.01); G02B 26/12 (2006.01)
CPC G03G 15/04036 (2013.01) [G02B 26/12 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A rotatable polygon mirror comprising:
a plurality of reflecting surfaces provided in parallel to a rotational axis direction and configured to reflect light;
a first surface of polygonal shape perpendicular to the plurality of reflecting surfaces and of which each side is connected to the plurality of reflecting surfaces;
a second surface of polygonal shape opposite to the first surface, perpendicular to the plurality of reflecting surfaces and of which each side is connected to the plurality of reflecting surfaces; and
a through hole configured to penetrate through the first surface and the second surface in parallel to the rotational axis direction and to engage with a rotational shaft of a driving portion,
wherein as seen in the rotational axis direction, the through hole has a shape which is a same type of polygon as the polygonal shape of the first surface and the polygonal shape of the second surface, and
wherein vertexes of the shape of the through hole are different in phase from apexes of the polygonal shape of the first surface and the polygonal shape of the second surface with respect to a rotational direction of the polygon mirror.