US 11,921,304 B2
Polygon mirror, deflection device, optical scanning apparatus and image forming apparatus
Takahito Chibana, Tochigi (JP); and Genichiro Kudo, Tochigi (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Apr. 8, 2022, as Appl. No. 17/716,196.
Claims priority of application No. 2021-069963 (JP), filed on Apr. 16, 2021.
Prior Publication US 2022/0334296 A1, Oct. 20, 2022
Int. Cl. G03G 15/043 (2006.01); G02B 1/14 (2015.01); G02B 5/09 (2006.01); G02B 26/08 (2006.01); G02B 26/12 (2006.01)
CPC G02B 5/09 (2013.01) [G02B 1/14 (2015.01); G02B 26/0816 (2013.01); G02B 26/121 (2013.01); G03G 15/043 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A polygon mirror comprising:
a base body having a plurality of side surfaces, a first surface adjacent to the plurality of side surfaces, and a second surface adjacent to the plurality of side surfaces and opposite to the first surface; and
a film formed on the plurality of side surfaces and extending from the plurality of side surfaces over the first surface and the second surface,
wherein the film comprises:
a first region formed on the first surface along the plurality of side surfaces; and
a second region formed on the second surface along the plurality of side surfaces,
wherein a first volume of the first region and a second volume of the second region are different from each other.