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Image forming apparatus

An image and image carrier technology, which is applied to the electric recording process using charge patterns, equipment and instruments of the electric recording process applying charge patterns, etc. Transfer and other issues

Inactive Publication Date: 2015-10-14
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the primary transfer voltage in each image forming station is a fixed value because it is generated by passing a current from the current supply member to the Zener diode.
Therefore, if the impedance of the primary transfer section fluctuates, the primary transfer current also fluctuates, making it difficult to control the transfer current.
As a result, the transfer cannot be performed with an appropriate transfer current, which may lead to poor transfer
In particular, when the electrical resistance of the intermediate transfer belt becomes low due to manufacturing tolerances or environmental fluctuations, this phenomenon remarkably occurs because the transfer current flows excessively.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0035] [Schematic Configuration of Image Forming Apparatus]

[0036] refer to figure 1 , the configuration and operation of the image forming apparatus of this embodiment will be described. figure 1 It is a schematic diagram showing an example (laser color printer) of the image forming apparatus of this embodiment. In addition, the image forming apparatus of this embodiment is a so-called tandem type printer in which four image forming workstations a to d are installed. The first image forming station a forms yellow (Y), the second image forming station b forms magenta (M), the third image forming station c forms cyan (C), and the fourth image forming station d forms black (Bk). color image. The configurations of the respective image forming workstations are the same except for the color of the toner to be accommodated, and will be described below using the first image forming workstation a.

[0037] The first image forming station a includes a drum-shaped electrophotograp...

Embodiment 2

[0079] refer to Figure 8 , an image forming apparatus according to Embodiment 2 of the present invention will be described. Figure 8 is a schematic sectional view of the image forming apparatus of this embodiment. Here, the differences from the first embodiment will be mainly described, and the same reference numerals will be assigned to the same structures as the first embodiment, and descriptions will be omitted. In Example 1, only the secondary transfer roller 20 is used as the current supply member, and current is supplied from the secondary transfer roller 20 to the intermediate transfer belt 10 . In contrast, the present embodiment is characterized in that current is supplied to intermediate transfer belt 10 from other conductive members other than secondary transfer roller 20 as the current supply member.

[0080] Specifically, as Figure 8 As shown, the image forming apparatus of the present embodiment is characterized in that a conductive roller 17 a as a conduct...

Embodiment 3

[0085] An image forming apparatus according to Embodiment 3 of the present invention will be described. Here, differences from Embodiments 1 and 2 will be mainly described, and the same symbols will be assigned to the same structures as Embodiments 1 and 2, and descriptions will be omitted. In the configurations of Embodiments 1 and 2, the magnitude of the constant current value from the current supply means is set (fixed) to a predetermined constant value. In contrast, the present embodiment is characterized in that the constant current value from the current supply means is changed according to the environment.

[0086] Specifically, having figure 1 A temperature / humidity sensor (temperature / humidity sensor) 19 as shown above sets a constant current value supplied from the current supply member to the intermediate transfer belt 10 based on the detection result. For example, in a high-temperature, high-humidity environment, the electrical resistance of the intermediate tran...

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PUM

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Abstract

In an image forming apparatus, a current supply member comes into contact with a belt at a position different from a position of the transfer section in a rotational direction of the belt, and a control unit performs constant current control on the current flowing through the current supply member by setting a predetermined value to a target current value, and can change a first state in which a part of the current supplied to the current supply member flows to a ground side via a constant voltage element, and a second state in which the current supplied to the current supply member does not flow to the ground side via the constant voltage element, by maintaining the constant current control by the predetermined value.

Description

technical field [0001] The present invention relates to a color image forming apparatus utilizing electrophotographic processing and the like. Background technique [0002] Conventionally, image forming apparatuses having a structure using an intermediate transfer body are known as image forming apparatuses such as copiers and laser beam printers. In this image forming apparatus, as a primary transfer process, a voltage is applied from a voltage source to a primary transfer member arranged to face the photosensitive drum, thereby transferring the toner formed on the surface of the photosensitive drum as an image carrier. The agent image is transferred to the intermediate transfer body. In a full-color printer or the like that forms a color image composed of a plurality of colors, the primary transfer process is performed for each color so that the toner images of the respective colors are superimposed on each other, forming a layer formed on the surface of the intermediate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16G03G15/01
CPCG03G15/16G03G15/80G03G15/1645G03G15/1675
Inventor 片桐真史铁野修一大野健鹰见怜
Owner CANON KK