The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 12, 2010
Filed:
Nov. 26, 2008
Kan Tanabe, Toride, JP;
Yoshihisa Saito, Toride, JP;
Hideki Ogawa, Moriya, JP;
Shoji Amamiya, Kashiwa, JP;
Tatsuya Ikezue, Toride, JP;
Takahiro Mitsui, Kawasaki, JP;
Mayumi Oshiro, Abiko, JP;
Kumiko Takizawa, Saitama, JP;
Kan Tanabe, Toride, JP;
Yoshihisa Saito, Toride, JP;
Hideki Ogawa, Moriya, JP;
Shoji Amamiya, Kashiwa, JP;
Tatsuya Ikezue, Toride, JP;
Takahiro Mitsui, Kawasaki, JP;
Mayumi Oshiro, Abiko, JP;
Kumiko Takizawa, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An electrophotographic photosensitive member is provide which inhibits recovered toner from leaking out of the edge portion at the time of long-term use, and has good durability. Each of at least both edge portions of the surface layer of the electrophotographic photosensitive member has a region in which independent depressed portions are formed at a density of ten or more portions per 100 μm square. An average depth Rdv-A, an average short axis diameter Lpc-A, and an average long axis diameter Rpc-A, of the depressed portions are respectively in specific ranges. When an angle formed between the circumferential direction of the electrophotographic photosensitive member and the long axis of each of the depressed portions is represented by θ, the depressed portions are formed so that the angle θ satisfies the relationship of 90°<θ<180° toward the center of the electrophotographic photosensitive member.