Charging roll and method of producing the same

A charging roller and conductive technology, applied in the field of charging roller, can solve the problems of sticking to the photosensitive drum and the peeling of the surface of the charging roller, and achieve the effects of suppressing pollution, preventing surface peeling, and suppressing image defects

Inactive Publication Date: 2010-10-20
SUMITOMO RIKO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, for a charging roller whose surface layer is formed of a synthetic resin composition mainly composed of a soft synthetic resin material (synthetic resin material with a low glass transition temperature), the charging roller is in contact with an image carrier such as a photosensitive drum in an electrophotographic device. If left in a hot and humid environment for a long time, the surface layer of the charging roller adheres to the surface of the photosensitive drum, etc., and the surface layer of the charging roller may peel off when the machine is used.

Method used

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  • Charging roll and method of producing the same
  • Charging roll and method of producing the same
  • Charging roll and method of producing the same

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Embodiment

[0047] Several embodiments of the present invention are given below to illustrate the present invention more specifically, and of course the present invention is not limited by the contents of the foregoing embodiments. In addition, it should be understood that, in addition to the following examples and the content specifically described above, various changes, modifications, and improvements can be made based on the knowledge of those skilled in the art as long as they do not depart from the spirit of the present invention.

[0048] First, five types of foamable conductive rubber compositions were prepared in accordance with the compounding ratios shown in Table 1 below as conductive rubber foam layer forming materials (A to E). In addition, when preparing each composition, the following rubber materials etc. were used.

[0049] ・Epichlorohydrin rubber: Epichlomer CG102 (trade name), manufactured by Daiso Co., Ltd.

[0050] ·Quaternary ammonium salt: Tetramethylammonium perc...

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Abstract

A charging roll is provided which does not cause image defects even when being used for a long period of time and does not allow a surface layer to be separated when an electrophotographic machine is operated after the charging roll installed therein is left under high temperature and humidity conditions. A charging roll includes a shaft, an electrically conductive rubber foam layer formed on an outer circumferential surface of the shaft, and a surface layer formed radially outwardly of the electrically conductive rubber foam layer. The electrically conductive rubber foam layer includes a skin layer having an opening area ratio of from 0.5 to 20% at a superficial layer of the electrically conductive rubber foam layer, and the surface layer is formed of a synthetic resin composition mainly composed of a synthetic resin material having a glass transition temperature of from 0 to 45 DEG C.

Description

technical field [0001] The present invention relates to a charging roller for charging an image carrier formed of an electrophotographic photoreceptor or an electrostatic recording medium in an image forming apparatus such as an electrophotographic copier, printer, or facsimile. Background technique [0002] The so-called roller charging method is widely used in image forming devices such as copiers, printers, and facsimile machines (hereinafter referred to as electrophotographic devices) that use electrophotography, that is, by connecting an image carrier such as a photoreceptor (drum) with the outer periphery of a charging roller. surface contact, and the above-mentioned image carrier and the charging roller rotate mutually, and then the surface of the image carrier is charged. [0003] As the charging roller used in the above-mentioned roller charging method, charging rollers with various structures have been proposed and used so far. A conductive rubber foam layer compo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/02F16C13/00
CPCG03G15/0233
Inventor 柏原伸吉河野淳洋斋藤仁宏
Owner SUMITOMO RIKO CO LTD
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