US 11,835,880 B2
Rotatable polygon mirror, optical deflecting device, scanning optical device, and image forming apparatus
Hisanori Kobayashi, Kanagawa (JP); and Takatoshi Tanaka, Shizuoka (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on May 20, 2022, as Appl. No. 17/750,092.
Claims priority of application No. 2021-087164 (JP), filed on May 24, 2021.
Prior Publication US 2022/0373925 A1, Nov. 24, 2022
Int. Cl. G03G 15/04 (2006.01); G02B 26/12 (2006.01)
CPC G03G 15/04036 (2013.01) [G02B 26/12 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A rotatable polygon mirror including a plurality of reflecting surfaces comprising:
a first surface connecting to said plurality of reflecting surfaces;
a second surface connecting to said plurality of reflecting surfaces and provided on a side opposite to said first surface with respect to a rotational axis direction;
a first protrusion portion with an annular shape, provided on said first surface and protruding in the rotational axis direction, about a rotational axis of said rotatable polygon mirror; and
a second protrusion portion with an annular shape, provided on said second surface and protruding in an opposite direction to a protrusion direction of said first protrusion portion, about the rotational axis of said rotatable polygon mirror,
wherein a top surface portion of said second protrusion portion is a part to be set on a rotor of a motor,
wherein a height of a top surface portion of said first protrusion portion from said first surface is higher than a height of the top surface portion of said second protrusion portion from said second surface with respect to the rotational axis direction, and
wherein, in a case that a plurality of said rotatable polygon mirrors are stacked in the rotational axis direction, a wall of an inner peripheral side of a first protrusion portion of a first rotatable mirror and a wall of an outer peripheral side of a second protrusion portion of a second rotatable mirror are engaged with each other.