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Image forming device

An image and image bearing technology, which is applied in the direction of corona discharge devices, electric recording technology using charge patterns, equipment for electric recording technology using charge patterns, etc., can solve the problem of reducing the printing speed of image forming devices, the error of discharge current value, Discharge current changes and other issues

Inactive Publication Date: 2009-07-08
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since the level difference of the charging current at points A, B and C, D is large, in the case of an error in the detection value, a large error occurs in the discharge current value
Therefore, there is a problem that the control of the optimum discharge current value cannot be performed.
[0015] (2) In the case of continuous printing operation, there is a problem of discharge current variation
With this method, since the printing speed of the image forming apparatus is reduced, it cannot be an effective countermeasure

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0052] The first embodiment of the present invention will be described below according to the accompanying drawings, figure 2 It is a configuration diagram of the laser printer 100 of the present embodiment and the second to seventh embodiments.

[0053] The laser printer 100 includes a table 101 for storing recording paper P, an in-table recording paper sensor 102 for detecting the presence or absence of recording paper P in the table 101, a paper size detection sensor 103 for detecting the size of the recording paper P in the table 101, and The pickup roller 104 that pulls out the recording paper P from the table 101, the table feed roller 105 that conveys the recording paper P pulled out by the pickup roller 104, and the table feed roller 105 that form a pair to prevent obstruction of conveying the stacked recording paper P Roller 106.

[0054] Downstream of the table top paper feed roller 105, a paper feed sensor 107 is arranged to detect the conveyance state of the pape...

no. 2 example

[0116] Next, a second embodiment of the present invention will be described. In the first embodiment, the detection of the nip current is performed by detecting the peak value of the differential value of the charging AC voltage. In the second embodiment, the detection of the nip current is performed according to the phase shift of the AC voltage in the predetermined phase interval.

[0117] Figure 11 It is a circuit diagram of the charging high-voltage output circuit of the image forming apparatus of the second embodiment, and its basic configuration is the same as that of the circuit of the first embodiment.

[0118] The difference with the first embodiment is that the voltage detection circuit 202 as the differential voltage detection circuit of the first embodiment is not provided, and the zero-crossing detection circuit 1009 for detecting the zero-crossing point of the positive and negative switching of the AC waveform and detecting the charging AC are provided. A circ...

no. 3 example

[0144] Figure 16A The relationship between the peak value of the charging AC voltage and the peak value of the differential value of the charging AC voltage (horizontal axis) and the charging current Ic (vertical axis) of the third embodiment is shown. For the charging high voltage control of the third embodiment, refer to Figure 16A Be explained. In the present embodiment, the charging AC voltage is applied to the charging roller so that the charging current Ic becomes a predetermined value Iac1, and then the following processing is performed.

[0145] Initially, the peak value Vac1 of the charging AC voltage corresponding to the intersection point a of the characteristic curve LINE A (the peak value of the charging AC voltage) and the straight line representing the charging current Iac1 is detected by the voltage detection circuit 201, and the peak value Vac1 of the charging AC voltage corresponding to the characteristic curve LINE B is detected by the voltage detection ci...

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PUM

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Abstract

An image forming apparatus in which an AC voltage generating mechanism generates an AC voltage. An AC voltage from an AC voltage generating mechanism is applied to the charging roller. The CPU controls the AC voltage generating mechanism so that a constant current corresponding to the control value flows in a path for supplying current from the AC voltage generating mechanism to the charging roller, the CPU outputs information corresponding to the peak voltage of the AC voltage applied to the charging roller, and Information corresponding to a change in the AC voltage applied to the charging roller is output when the AC voltage is in a predetermined phase.

Description

technical field [0001] The present invention relates to an image forming apparatus, and more particularly, to an electrophotographic type image forming apparatus that forms an image while charging an image bearing member. Background technique [0002] An electrophotographic image forming apparatus performs a process of uniformly charging the surface of a photosensitive drum, which is a drum-type electrophotographic photoreceptor, as is well known. In the past, corona charging was generally used as a charging method, that is, the corona generated after applying a high voltage to a thin corona discharge wire acts on the surface of the photosensitive drum to charge. In recent years, the contact charging method, which is advantageous in terms of low-pressure treatment, low ozone generation, and low cost, is becoming the mainstream. In this method, for example, a charging roller as a charging roller member is brought into contact with the surface of the photosensitive drum, and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/02G03G15/00
CPCG03G15/0266G03G2215/021
Inventor 酒井宏明高见洋
Owner CANON KK
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