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Charging member, process cartridge, and electrophotographic apparatus

A charging part, electrophotographic technology, applied in the direction of corona discharge devices, electrical components, circuits, etc., can solve the problem that C-set cannot be fully excluded

Active Publication Date: 2006-03-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, according to the studies of the present inventors, they have come to understand that the technology disclosed in Patent Document 1 cannot sufficiently exclude the C- set

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

Embodiment 1

[0201] Produce composite particles:

[0202] Under the rotation of the wheel mill, 7.0kg of silicon dioxide particles (average particle diameter: 17nm; volume resistivity: 1.8×10 12 Ωcm) was added 140 g of methylhydrogenpolysiloxane, and mixed and stirred for 30 minutes under a load per unit length of 588 N / cm (60 kg / cm). Here, stirring was performed at a speed of 22 rpm.

[0203] Then, under the rotation of the wheel mill, 7.0kg of carbon black particles (average particle diameter: 15nm; volume resistivity: 2.0×10 2 Ωcm), and further mixed and stirred for 60 minutes under a unit length load of 588N / cm (60kg / cm) to make the carbon black adhere to the methylhydrogenpolysiloxane coating, followed by drying at 80°C by means of a drier 60 minutes, thereby producing composite particles. In addition, here stirring is performed at a speed of 22 rpm.

[0204] The obtained composite particles had an average particle diameter of 15 nm and a volume resistivity of 1.8×10 2 Ωcm.

[0...

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Abstract

A charging member is discloed having a support and at least one cover layer provided on the support. The outermost layer of the cover layer placed at the outermost surface of the charging member contains composite particles composed of first metal oxide particles coated with carbon black, second metal oxide particles and a binder.

Description

technical field [0001] The present invention relates to a charging member, and a process cartridge and an electrophotographic apparatus having the charging member. Background technique [0002] An image forming apparatus using an electrophotographic system (referred to as an electrophotographic apparatus) generally has an electrophotographic photosensitive member, a charging device, an exposure device, a developing device, and a transfer device. [0003] In the charging device, a system is mainly used in which a voltage (only a DC voltage or a voltage generated by superimposing an AC voltage on a DC voltage) is applied to a charging member in contact with or close to the surface of an electrophotographic photosensitive member, The surface of the electrophotographic photosensitive member is thereby electrostatically charged. [0004] When a voltage generated by superimposing an AC voltage on a DC voltage is used as a voltage applied to a charging member, an AC power source i...

Claims

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Application Information

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IPC IPC(8): G03G15/02B32B33/00
Inventor 谷口智士原田昌明高木英行大高利博泽田弥齐
Owner CANON KK