US 10,890,860 B2
Sensor unit and image forming apparatus
Hirotoshi Tajima, Toride (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Jul. 16, 2019, as Appl. No. 16/512,847.
Claims priority of application No. 2018-136193 (JP), filed on Jul. 19, 2018.
Prior Publication US 2020/0026218 A1, Jan. 23, 2020
Int. Cl. G03G 21/00 (2006.01); G03G 15/08 (2006.01)
CPC G03G 15/0848 (2013.01) [G03G 21/00 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
a rotating member configured to rotate and bear a toner image;
a sensor unit provided with a sensor configured to detect the toner image borne on said rotating member, an exposure opening exposing a detection surface of said sensor, and a casing accommodating said sensor;
a fan configured to feed air; and
a duct portion, provided in said sensor unit, configured to feed the air fed from said fan to a space between said sensor and said rotating member,
wherein said sensor is provided outside of said duct portion and an exhaust opening of said duct portion is provided upstream of the detection surface of said sensor with respect to a rotating direction of said rotating member.