US 11,787,197 B2
Image forming apparatus and measurement apparatus
Keita Shigihara, Chiba (JP); and Kenichi Hirota, Ibaraki (JP)
Assigned to Canon Kabushiki Kaisha, Tokyo (JP)
Filed by CANON KABUSHIKI KAISHA, Tokyo (JP)
Filed on Feb. 22, 2022, as Appl. No. 17/676,947.
Claims priority of application No. 2021-036277 (JP), filed on Mar. 8, 2021.
Prior Publication US 2022/0281227 A1, Sep. 8, 2022
Int. Cl. B41J 2/21 (2006.01); B41J 11/42 (2006.01)
CPC B41J 2/2103 (2013.01) [B41J 11/42 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An image forming apparatus comprising:
an image forming unit configured to form an image on a sheet;
a conveyance guide configured to guide the sheet on which the image has been formed by the image forming unit, the conveyance guide having an opening portion;
a measurement unit configured to measure the image on the sheet conveyed through a conveyance path formed by the conveyance guide, the measurement unit including a light entrance portion through which light from a measurement object enters the measurement unit; and
a moving member movable with respect to the measurement unit and disposed on a same side as the measurement unit with respect to the conveyance path, the moving member including a reference portion configured to be measured by the measurement unit,
wherein the measurement unit is movable to a first position and a second position along a first direction approaching and moving away from the opening portion, the first position being a position where the measurement unit faces the opening portion in the conveyance guide, the second position being a position away from the opening portion in comparison with the first position,
wherein the moving member is movable to a third position and a fourth position along a second direction intersecting with the first direction, the third position being a position where the reference portion does not face the light entrance portion, the fourth position being a position where the reference portion faces the light entrance portion,
wherein the measurement unit is configured to measure the image on the sheet through the opening portion in a first state where the measurement unit is positioned in the first position and the moving member is positioned in the third position, and
wherein the measurement unit is configured to measure the reference portion in a second state where the measurement unit is positioned in the second position and the moving member is positioned in the fourth position.