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Charging roller, process cartridge and image forming apparatus

A charging roller and image carrier technology, which can be used in corona discharge devices, electric recording technology using charge patterns, equipment for electric recording technology using charge patterns, etc., and can solve the problems of ion conductive agent leakage, etc.

Inactive Publication Date: 2007-10-31
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when the surface-treated charging rollers described in Documents 2 to 9 are stored for a long period of time in a high-temperature, high-humidity environment, there is a problem that the ion-conducting agent contained in the rubber member bleeds out.

Method used

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  • Charging roller, process cartridge and image forming apparatus
  • Charging roller, process cartridge and image forming apparatus
  • Charging roller, process cartridge and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1

[0110] The calcination temperature in the above-mentioned calcination process was set to "high" among three steps consisting of "high", "standard", and "low". The firing time was set to "long" among three steps consisting of "long", "standard" and "short". The concentration of the surface treatment liquid was set to "high" among three steps consisting of "high", "standard", and "low".

[0111] The charging roller 2 surface-treated under the above-mentioned conditions was brought into contact with the photoreceptor 1 coated with lubricant and stored for a long period of time. As a result, image defects due to contamination of the photoreceptor were not found from the first sheet. Also, the coefficient of dynamic friction between the charging roller 2 and the photoreceptor 1 is 0.25.

[0112] However, after the charging roller 2 was assembled into the modified equipment for printing, black streak-like image defects were obviously found. This is considered to be because the sli...

Embodiment 1-2

[0114] The firing temperature was set to "high", the firing time was set to "long", and the concentration of the surface treatment liquid was set to "high".

[0115] The charging roller 2 surface-treated under the above conditions was brought into contact with the photoreceptor 1 not coated with lubricant and stored for a long period of time. As a result, image defects due to contamination of the photoreceptor were not found from the first sheet. Also, the coefficient of dynamic friction between the charging roller 2 and the photoreceptor 1 is 0.25.

[0116]However, after printing with the charging roller 2 , a small amount of image defects in the form of black streaks were found. It is considered that this is because the charging roller 2 slightly slipped.

Embodiment 1-3

[0118] The calcination temperature was set as "high", the calcination time was set as "long", and the concentration of the surface treatment liquid was set as "standard".

[0119] The charging roller 2 surface-treated under the above-mentioned conditions was brought into contact with the photoreceptor 1 not coated with lubricant and stored for a long period of time. As a result, image defects due to contamination of the photoreceptor were not found from the first sheet. Also, the coefficient of dynamic friction between the charging roller 2 and the photoreceptor 1 was 0.27. Further, even after printing was performed with this charging roller 2 , no image defect due to slipping of the charging roller 2 was found.

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PUM

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Abstract

The invention provides a charging roller which includes a rubber member with a surface subjected to a hardening treatment using a solvent containing at least an isocyanate compound, and which prevents leakage of an ionic conductive agent even if the charging roller is placed in high-temperature and high-humidity environment for a long period of time. The charging roller is made by forming a rubber layer on a metal core. The rubber layer is an epichlorohydrin based rubber base material to which the ionic conductive agent is added, and is subjected to a surface treatment by applying a solution containing the isocyanate compound thereon and heating it. The surface treatment is carried out under such conditions that a coefficient of dynamic friction at a contact portion between the rubber layer and a photoreceptor becomes 0.4 or less.

Description

technical field [0001] The present invention relates to a charging roller that contacts an image carrier on which an electrostatic latent image is formed to charge the image carrier in an electrophotographic image forming apparatus. Background technique [0002] In electrophotographic image formation, an electrostatic latent image corresponding to an image is formed on the surface of a photoreceptor. In this case, before the electrostatic latent image is formed, it is necessary to perform a charging treatment for uniformly charging the surface of the photoreceptor. Among them, the charging method of the photoreceptor includes two types: a non-contact charging method and a contact charging method. [0003] In the non-contact charging method, a so-called corotron charger or a scorotron charger is used, and charges are supplied to a photoreceptor through air as a medium by corona discharge caused by the charger. In this non-contact charging method, since the charger does not ...

Claims

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Application Information

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IPC IPC(8): G03G15/02G03G21/18G03G15/00
Inventor 香川敏章新川幸治佐桑彻
Owner SHARP KK
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