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Image forming apparatus

An image and image-carrying technology, which is applied to the electrical recording process using the charge pattern, equipment and instruments for the electrical recording process using the charge pattern, and can solve the problems of insufficient static elimination effect and excessive static elimination effect, etc.

Active Publication Date: 2016-06-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, if the voltage applied to the static elimination part is fixed, a sufficient static elimination effect may not be obtained, or an excessive static elimination effect may be obtained depending on a change in I-V characteristics

Method used

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Experimental program
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no. 1 example

[0026] Hereinafter, a first embodiment will be described.

[0027] figure 1 is a cross-sectional view showing a schematic configuration of the image forming apparatus according to the present embodiment.

[0028] In this embodiment, a laser beam printer (hereinafter referred to as printer 100 ) will be described as an example of an image forming apparatus.

[0029] The photosensitive drum 1 as an image bearing member is in figure 1 is rotated in the direction indicated by the arrow shown in , and its surface is caused to be uniformly charged by the charging roller 2 . Subsequently, scanning exposure is performed by laser scanner 3 using laser beam L whose on and off is controlled according to image information, and a latent image (electrostatic latent image) is formed on the surface of photosensitive drum 1 . In addition, the toner is attached to the latent image by the developing operation of the developing device 4 , and a toner image is formed on the photosensitive drum ...

no. 2 example

[0082] Hereinafter, a second embodiment will be described.

[0083] In the first embodiment, before image formation, the potential difference ΔV set using the neutralization current Ij detected by the neutralization ammeter 17 is stored, and during image formation, the neutralization is controlled with respect to the image formation transfer voltage voltage, thereby maintaining a potential difference ΔV.

[0084] In contrast, in the present embodiment, when the potential difference ΔV is stored before image formation, by the detection result based on the current between the transfer roller 5 and the static elimination needle 10 detected by the transfer ammeter 15, the static elimination The value of the neutralizing current Ij flowing in the needle 10 is used to store the potential difference ΔV. In this case, although the details will be described later, the initial value of the transfer current when the transfer voltage is fixed is stored, and the value of the transfer curr...

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Abstract

The image forming apparatus includes a CPU capable of executing neutralization control in which, prior to image formation, a potential difference between a voltage applied to a transfer roller by a transfer power supply and a voltage applied to a neutralization needle by a neutralization power supply is gradually increased, and a value of the potential difference when the value detected by the neutralization current meter exceeds a threshold is stored, and in which, during image formation, a value of the voltage applied by the neutralization power supply is controlled based on the stored potential difference and the value of an image formation voltage applied by the transfer power supply.

Description

technical field [0001] The present invention relates to an image forming apparatus, such as a copier or a printer, having a function of forming an image on a recording material such as paper. Background technique [0002] An image forming apparatus is widely used that conveys a recording material so that a toner image carried on an image bearing member (photosensitive drum or intermediate transfer member) is superimposed on the recording material at a transfer portion. The toner image is transferred onto a recording material. In such an image forming apparatus, in a process in which the recording material passes through the transfer portion, a discharge electrode as a charge removing member is sometimes provided on the downstream side of the transfer portion in order to remove excess charge injected into the recording material. , and enhance the separability of the recording material with respect to the image bearing member. Japanese Patent Application Laid-Open No. 2010-9...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16
CPCG03G15/1645G03G15/1675G03G15/6573G03G15/1665G03G21/20
Inventor 横山健
Owner CANON KK