Electrophotographic apparatus with photosensitive member having surface layer of binder resin and fluoro and/or silicon compound particles

• US 5,485,250 A
• Filed: 08/11/1994
• Issued: 01/16/1996
• Est. Priority Date: 09/04/1992
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamagami, Masaaki, Kasuya, Takashige, Nakamura, Kazushige, Ikezue, Tatsuya, Amamiya, Shoji, Tsuji, Haruyuki, Kashimura, Noboru, Sakoh, Harumi
• Primary Examiner(s): Royer, William J.
• Application Number:
  US08/289,269
• Time in Patent Office: 523 Days
• Field of Search: 355/211, 430/66, 430/67
• US Class Current: 399/116
• CPC Class Codes: G03G 5/0539 Halogenated polymers
• CPC Class Codes: G03G 5/0578 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/0592 Macromolecular compounds characterised by their structure or by their chemical properties, e.g. block polymers, reticulated polymers, molecular weight, acidity
• CPC Class Codes: G03G 5/14726 Halogenated polymers
• CPC Class Codes: G03G 5/14773 Polycondensates comprising silicon atoms in the main chain
• CPC Class Codes: G03G 5/14791 Macromolecular compounds characterised by their structure, e.g. block polymers, reticulated polymers, or by their chemical properties, e.g. by molecular weight or acidity

Abstract

An electrophotographic apparatus is disclosed which has an electrophotographic photosensitive member and a transfer device. The photosensitive member has a conductive support and a photosensitive layer, and further has a surface layer formed of a binder resin, fluorine atom- or silicon atom-containing compound particles incompatible with the binder resin, and a fluorine atom- or silicon atom-containing compound compatible with the binder resin. In the surface layer, the proportion of fluorine atoms and silicon atoms to carbon atoms, (F+Si)/C, as measured by X-ray photoelectron spectroscopy is 0.01 to 1.0. Additionally, the transfer device is a multiple-transfer device.

Claims

1. An electrophotographic apparatus comprising an electrophotographic photosensitive member and a transfer means, wherein:

said electrophotographic photosensitive member comprises a conductive support having on its surface a photosensitive layer, and said electrophotographic photosensitive member has a surface layer comprising carbon atoms and at least one selected from the group consisting of fluorine atoms and silicon atoms, the proportion of fluorine atoms and silicon atoms to carbon atoms (F+Si)/C, in said surface layer as measured by X-ray photoelectron spectroscopy being from 0.01 to 1.0; and

said transfer means transfers different colors one by one onto a transfer medium in a plurality of times.

2. An electrophotographic apparatus according to claim 1, wherein said surface layer contains carbon atoms and fluorine atoms in a proportion of fluorine atoms to carbon atoms, F/C, from 0.01 to 1.0.

3. An electrophotographic apparatus according to claim 1, wherein said surface layer contains carbon atoms and silicon atoms in a proportion of silicon atoms to carbon atoms, Si/C, from 0.01 to 1.0.

4. An electrophotographic apparatus according to claim 1, wherein said surface layer is the photosensitive layer.

5. An electrophotographic apparatus according to claim 1, wherein said surface layer is a protective layer formed on the photosensitive layer.

6. An electrophotographic apparatus according to claim 1, wherein an image transferred by said transfer means is an image formed by development of a dotlike electrostatic latent image.