US Patent No. 9,389,521

ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS


Patent No. 9,389,521
Issue Date July 12, 2016
Title Electrophotographic Photosensitive Member, Process Cartridge, And Electrophotographic Apparatus
Inventorship Koji Takahashi, Kashiwa (JP)
Takahiro Mitsui, Kawasaki (JP)
Naoaki Ichihashi, Kashiwa (JP)
Yasuhiro Kawai, Abiko (JP)
Hideki Ogawa, Moriya (JP)
Assignee CANON KABUSHIKI KAISHA, Tokyo (JP)

Claim of US Patent No. 9,389,521

1. An electrophotographic photosensitive member, comprising:
a cylindrical support; and
a photosensitive layer formed on the support,
wherein a surface of the electrophotographic photosensitive member has:
a plurality of depressed portions each having a depth of 0.5 ?m or more and 5 ?m or less and a longest diameter of an opening
of 20 ?m or more and 80 ?m or less; and

a plurality of line grooves formed at portions other than the plurality of depressed portions, the plurality of line grooves
each having a width in a generatrix line direction of the electrophotographic photosensitive member of 0.5 ?m or more and
15 ?m or less and forming an angle of 80° or more and 100° or less with respect to the generatrix line direction, and

wherein when a square region 500 ?m on a side is arranged at an arbitrary position of the surface of the electrophotographic
photosensitive member, an area of the plurality of depressed portions in the square region 500 ?m on a side is 95,000 ?m2 or more and 180,000 ?m2 or less.