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Charging member, process cartridge, and electrophotographic apparatus

A charging member, electrophotography technology, applied to equipment, electrical components, corona discharge devices, etc. that apply the electric recording process of the charge pattern, and can solve the problem of stably charging the photosensitive member to a specified potential, reducing the level of electrophotographic images, etc. question

Inactive Publication Date: 2013-12-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such vibration not only causes charging noise, but also vibrates the charging member in contact with the photosensitive member, making it difficult to stably charge the photosensitive member to a prescribed potential, and as a result, sometimes degrades the level of electrophotographic images

Method used

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  • Charging member, process cartridge, and electrophotographic apparatus
  • Charging member, process cartridge, and electrophotographic apparatus
  • Charging member, process cartridge, and electrophotographic apparatus

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0124] [Preparation Example 1] Preparation of Composite Conductive Fine Particles

[0125] 140g of methyl hydrogen polysiloxane was added to 7.0kg of silica particles (number average particle diameter: 15nm, volume resistivity: 1.8×10 12 Ω·cm), operate the wheel mill. These materials were then mixed and stirred for 30 minutes under a linear load of 588 N / cm (60 kg / cm). Here, stirring was performed at a speed of 22 rpm. Add 7.0kg of carbon black particles (number-average particle diameter: 20nm, volume resistivity: 1.0×10) through the time of 10 minutes in the material stirred like this 2 Ω·cm, pH: 8.0), operating the wheel mill, these materials were further mixed, and stirred under a linear load of 588 N / cm (60 kg / cm) for 60 minutes.

[0126]Thus, carbon black was allowed to adhere to the surface of the silica particles that had been coated with methylhydrogenpolysiloxane, and then dried by a drier at 80° C. for 60 minutes to obtain composite conductive fine particles. Her...

preparation example 2

[0127] [Preparation Example 2] Preparation of surface-treated titanium oxide particles

[0128] 1000g of acicular rutile titanium oxide particles (number average particle diameter: 15nm, length / width=3:1, volume resistivity: 2.3×10 10 Ω·cm) was mixed with 110 g of isobutyltrimethoxysilane as a surface treatment agent and 3000 g of toluene as a solvent to prepare a slurry. The slurry was mixed by a stirrer for 30 minutes, and then supplied to a Visco mill filled with 80% of the effective internal volume of glass beads having a number average particle diameter of 0.8 mm, thereby performing a wet process at a temperature of 35±5°C. Shred processing.

[0129] The slurry obtained by wet disintegration treatment was distilled under reduced pressure by using a kneader (bath temperature: 110°C, product temperature: 30°C to 60°C, degree of reduced pressure: about 100 Torr) to remove toluene, and then surface treated The agent was fired at 120°C for 2 hours. The particles that had be...

Embodiment 1

[0131] [substrate]

[0132] A substrate made of stainless steel with a diameter of 6 mm and a length of 252.5 mm was coated with a thermosetting binder containing 10% by mass of carbon black, and then dried.

[0133] [Material for the first rubber layer]

[0134] The materials shown in Table 1 below were kneaded using an internal mixer controlled at a temperature of 50° C. to obtain an unvulcanized rubber composition.

[0135] [Table 1]

[0136]

[0137] Next, 1.2 parts by mass of sulfur as a vulcanizing agent and 1 part by mass of dibenzothiazole vulcanization (DM) and 1 part by mass of tetramethylsulfuric acid as a vulcanization accelerator were added to 178.5 parts by mass of the above-mentioned unvulcanized rubber composition. Lamb (TS), these materials were kneaded for 10 minutes by a two-roll mill kept at a temperature cooled to 20° C., thereby obtaining a material for the first rubber layer.

[0138] [Material for the second rubber layer]

[0139] The materials s...

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Abstract

Provided is a charging member which does not easily oscillate even in cases where a high-frequency alternating current voltage is applied thereto and which is capable of stably charging a photosensitive body. The charging member comprises an electrically conductive base, an electrically conductive elastic layer, and a surface layer. The elastic layer comprises, from the base side, a first rubber layer and a second rubber layer that is arranged on the first rubber layer. When the natural frequency of the first rubber layer is represented by f1 and the natural frequency of the second rubber layer is represented by f2, the natural frequency ratio (f2 / f1) is from 2.35 to 10.0 (inclusive).

Description

technical field [0001] The present invention relates to a charging member, a process cartridge and an electrophotographic apparatus using the same. Background technique [0002] In an electrophotographic apparatus, in order to stably electrostatically charge a drum-shaped electrophotographic photosensitive member (hereinafter simply referred to as "photosensitive member"), an AC voltage in a state of being superimposed on a DC voltage is generally applied to the electrophotographic photosensitive member. The charging member that the member contacts. As a problem in such charging systems, vibration noise occurs due to resonance existing between the photosensitive member and the charging member. [0003] In order to cope with this problem, as disclosed in Patent Document 1, a method is proposed in which a charging member having a natural vibration frequency at which resonance due to the frequency of the applied AC voltage does not occur is used, thereby preventing vibration f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/02
CPCG03G15/02G03G15/0233
Inventor 谷口智士儿玉真隆青山雄彦
Owner CANON KK
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