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Charging apparatus and image forming apparatus

A charging device and technology to be charged, applied in the directions of corona discharge devices, circuits, electrical components, etc., can solve problems such as performance degradation, reduced charging performance of charging devices, mechanical damage, etc.

Inactive Publication Date: 2010-02-03
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the cleaning blade is kept pressed against the portion of the photosensitive drum having a step for a long time, the performance of the portion of the cleaning blade corresponding to the step is degraded or mechanically damaged
Deteriorated or damaged parts of the cleaning blade cannot remove toner particles and foreign matter from the drum
Therefore, toner particles and impurities leak through the cleaning blade and enter the charging device, thereby reducing the charging performance of the charging device

Method used

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  • Charging apparatus and image forming apparatus
  • Charging apparatus and image forming apparatus
  • Charging apparatus and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] (1) Example of imaging device

[0036] Figure 8 is a schematic diagram of an example of an imaging device in which a charging device according to the present invention can be installed, Figure 8 The structure of the imaging device is also shown. The image forming apparatus is an electrophotographic copier.

[0037] In the following description of the preferred embodiments of the present invention, the "longitudinal direction" of the image forming apparatus and its structural components means the direction perpendicular to the direction in which the recording medium is conveyed in the main assembly of the image forming apparatus. It is parallel to the axis of the image bearing member (that is, the member to be charged). The "transverse direction" of the image forming apparatus and its structural components is a direction parallel to the aforementioned recording medium transport direction.

[0038] The main assembly of the image forming apparatus in this embodiment ...

Embodiment 2

[0089] The difference between this embodiment and the first embodiment lies in that the material of the conductive member 157 of the charging device in this embodiment is different from that of the first embodiment. In this embodiment, the material used for the conductive member 157 of the charging device 2 is non-magnetic SUS.

[0090]The structure of the charging device in this embodiment is the same as that of the charging device 2 in the first embodiment, except that the material of the conductive member 157 of the charging device 2 in this embodiment is non-magnetic SUS. Therefore, those parts, parts, etc. of the charging device in this embodiment that are the same as those in the first embodiment use the same reference numerals as the corresponding parts, parts in the first embodiment, and will not be described again. Arrangements related to reference numerals are also the same in the third, fourth and fifth embodiments.

[0091] In order to confirm that the amount of m...

Embodiment 3

[0096] Figure 9 is a vertical sectional view of the charging device used in this embodiment, showing the relationship between the charging device 2 and the photosensitive drum 1 . Figure 10 is a plan view of the charging device used in this embodiment, showing the positional relationship among the first charging sleeve 131 , the second charging sleeve 132 and the conductive member 159 . Figure 10 Parts of the charging device 2 are shown with Figure 9 Parts of the charging device 2 shown are the same, except Figure 10 The photosensitive drum 1 is not shown in the Figure 10 In , the two charging sleeves are viewed from the bottom side of the charging device 2 .

[0097] The difference between the charging device 2 in the present embodiment and the charging device 2 in the first embodiment is that the charging device in the present embodiment does not have the same inner surface mounted to the charging device housing 130 in the first embodiment. The conductive member 15...

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Abstract

A charging apparatus for charging a member to be charged by contacting magnetic particles to the member to be charged, includes a magnetic particle carrying member for magnetically carrying the magnetic particles, wherein the magnetic particle carrying member is provided at a longitudinal end portion of the magnetic particle carrying member with an insulative portion for electrically insulating from the magnetic particles carried by the magnetic particle carrying member; and an electroconductive member disposed for contacting the magnetic particles carried on the insulative portion, wherein anabsolute value of a potential of the electroconductive member is lower than an absolute value of a voltage applied to the magnetic particle carrying member.

Description

technical field [0001] The present invention relates to a charging device installed in an image forming apparatus such as an electrophotographic copier. The present invention also relates to an imaging device having a charging device. Background technique [0002] Image forming apparatuses such as electrophotographic copiers, electrophotographic printers, and the like use charging devices for charging the outer peripheral surface (circumferential surface) of a photosensitive drum as an image bearing member. As one type of charging device for charging a photosensitive drum, a charging device having a charging roller or a magnetic brush is known. This type of charging device (hereinafter may be simply referred to as a contact charging device) charges the peripheral surface of the photosensitive drum by bringing a charging roller or magnetic brush into contact with the peripheral surface of the photosensitive drum. Among contact-type charging devices, a charging device using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/02G03G15/00
Inventor 堀田真吾中村良桥本浩一
Owner CANON KK