US 12,135,508 B2
Image forming apparatus
Takamasa Tsukada, Ichinomiya (JP); and Junichi Yokoi, Nagoya (JP)
Assigned to Brother Kogyo Kabushiki Kaisha, Nagoya (JP)
Filed by Brother Kogyo Kabushiki Kaisha, Nagoya (JP)
Filed on Oct. 13, 2023, as Appl. No. 18/486,312.
Application 18/486,312 is a continuation of application No. 17/935,216, filed on Sep. 26, 2022, granted, now 11,809,094.
Application 17/935,216 is a continuation of application No. 17/222,633, filed on Apr. 5, 2021, granted, now 11,487,216, issued on Nov. 1, 2022.
Application 17/222,633 is a continuation of application No. 16/727,546, filed on Dec. 26, 2019, granted, now 10,996,584, issued on May 4, 2021.
Application 16/727,546 is a continuation of application No. 16/519,140, filed on Jul. 23, 2019, granted, now 10,558,139, issued on Feb. 11, 2020.
Application 16/519,140 is a continuation of application No. 16/257,803, filed on Jan. 25, 2019, granted, now 10,372,057, issued on Aug. 6, 2019.
Application 16/257,803 is a continuation of application No. 15/843,038, filed on Dec. 15, 2017, granted, now 10,228,631, issued on Mar. 12, 2019.
Claims priority of application No. 2016-243132 (JP), filed on Dec. 15, 2016; application No. 2016-243134 (JP), filed on Dec. 15, 2016; application No. 2016-243138 (JP), filed on Dec. 15, 2016; and application No. 2016-243141 (JP), filed on Dec. 15, 2016.
Prior Publication US 2024/0111226 A1, Apr. 4, 2024
Int. Cl. G03G 21/16 (2006.01); G03G 15/04 (2006.01)
CPC G03G 15/04054 (2013.01) [G03G 21/1647 (2013.01); G03G 21/1666 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An image forming apparatus, comprising:
a drum unit comprising:
a photosensitive drum;
a first flange arranged on one side of the photosensitive drum in a rotation axis direction of the photosensitive drum, the first flange being fitted to an inner circumferential surface of the photosensitive drum; and
a first contact face arranged on a line extending orthogonally to a rotation axis of the photosensitive drum, the first contact face facing outward in a radial direction of the photosensitive drum, and
an exposure head, comprising:
a plurality of light emitters aligned along the rotation axis direction;
a lens array focusing light from the light emitters on the photosensitive drum;
a head frame supporting the light emitters and the lens array; and
a contact member configured to contact the drum unit and define a distance between the lens array and the photosensitive drum along a direction of an optical axis of the light,
wherein the contact member includes:
a second contact face configured to contact the first contact face in the direction of the optical axis; and
a cylindrical rod extending in the direction of the optical axis, the cylindrical rod being inserted in a through hole formed in the head frame.