US 12,169,372 B2
Light scanning apparatus and image forming apparatus including the same
Kazumi Kimura, Saitama (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Sep. 22, 2021, as Appl. No. 17/481,824.
Claims priority of application No. 2020-163480 (JP), filed on Sep. 29, 2020.
Prior Publication US 2022/0100118 A1, Mar. 31, 2022
Int. Cl. G02B 26/12 (2006.01); G03G 15/043 (2006.01)
CPC G03G 15/043 (2013.01) [G02B 26/125 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a deflecting unit configured to deflect a light flux from a light source to scan a scanned surface in a main scanning direction; and
an imaging optical system configured to guide the deflected light flux to the scanned surface,
wherein a width of the light flux is larger than the width of a deflecting surface of the deflecting unit in a main scanning cross section when the light flux is incident on the deflecting surface,
wherein a refractive power in the main scanning cross section of the imaging optical system is different between a first position through which an on-axis light flux passes and a second position through which an outermost off-axis light flux passes, and
wherein a first region at one side is longer than a second region at the other side with respect to an optical axis of the imaging optical system on the scanned surface.