ELECTROPHOTOGRAPHIC PHOTOSENSITIVE MEMBER, PROCESS CARTRIDGE, AND ELECTROPHOTOGRAPHIC APPARATUS

• US 20080124637A1
• Filed: 06/28/2007
• Published: 05/29/2008
• Est. Priority Date: 01/31/2006
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Ochi, Atsushi, Uematsu, Hiroki, Ogaki, Harunobu, Shimada, Akira, Kikuchi, Toshihiro, Kawahara, Masataka, Sumida, Takayuki, Koganei, Akio, Maruyama, Akio, Teramoto, Kyoichi
• Granted Patent: US 7,718,331 B2
• Time in Patent Office: Days
• US Class Current: 430/56
• CPC Class Codes: G03G 5/00 Recording members for original recording by exposure, e.g. to light, to heat, to electrons; Manufacture thereof; Selection of materials therefor recording surfaces for measuring apparatus G01D15/34; photosensitive materials for photographic purposes G03C
• CPC Class Codes: G03G 5/04 Photoconductive layers; Charge-generation layers or charge-transporting layers; Additives therefor; Binders therefor
• CPC Class Codes: G03G 5/147 Cover layers

Abstract

An electrophotographic photosensitive member is disclosed which is excellent in cleaning performance, has improved durability, and suppresses image defects in various environments. The electrophotographic photosensitive member has a support and a photosensitive layer provided on the support. Depressed portions independent of one another are formed on the surface of the electrophotographic photosensitive member so that the number of the depressed portions per 100 μm square is 76 or more and 1,000 or less. The openings of the depressed portions have an average major axis diameter of more than 3.0 μm and 14.0 μm or less.

Claims

1. An electrophotographic photosensitive member, comprising a support and a photosensitive layer provided on the support, wherein a plurality of depressed portions independent of each other are formed on the surface of the electrophotographic photosensitive member, the number of the depressed portions per 100 μ

m square is 76 or more and 1,000 or less, and openings of the depressed portions have an average major axis diameter of more than 3.0 μ

m and 14.0 μ

m or less.

2. An electrophotographic photosensitive member according to claim 1, wherein the openings of the depressed portions have an area ratio of 40% or more.

3. An electrophotographic photosensitive member according to claim 1, wherein the openings of the depressed portions have an average major axis diameter of 5.0 μ

m or more and 10 μ

m or less.

4. An electrophotographic photosensitive member according to claim 1, wherein the number of the depressed portions per 100 μ

m square is 100 or more and 500 or less.

5. A process cartridge which integrally holds the electrophotographic photosensitive member according to claim 1 and at least one device selected from the group consisting of a charging device, a developing device, and a cleaning device, and is detachably mountable to a main body of an electrophotographic apparatus.

6. An electrophotographic apparatus, comprising the electrophotographic photosensitive member according to claim 1, a charging device, an exposing device, a developing device and a transferring device.