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Image forming apparatus

An image and non-image technology, which is applied to corona discharge devices, electrical recording processes using charge patterns, equipment for electrical recording processes applying charge patterns, etc., and can solve problems such as discarding and image quality deterioration.

Inactive Publication Date: 2009-04-01
OKI DATA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, other abnormally charged toner existing inside the developing unit device cannot be discarded, and image quality may be deteriorated by such abnormally charged toner
Also, like abnormally charged toner, normal toner adheres to the same latent image on the photosensitive drum and may be discarded

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0035] FIG. 1 is a block diagram showing a control system of an image forming apparatus according to a first embodiment of the present invention. figure 2 is a sectional view showing the image forming apparatus according to the first embodiment of the present invention. image 3 is a schematic diagram showing main components of the image forming apparatus according to the first embodiment of the present invention.

[0036] The image forming apparatus 100 according to the present embodiment may be any type of image forming apparatus such as a printer, a facsimile machine, a copier, a compound machine (having various functions), and the like. Here, the image forming apparatus 100 takes the form of an electrophotographic printer that forms images using electrophotography. Although the image forming apparatus 100 may be configured to form a color image, for convenience of explanation, the image forming apparatus 100 will be described as an image forming apparatus that forms a mon...

no. 2 example

[0147] Next, a second embodiment of the present invention is described. The same components as those of the first embodiment are given the same reference numerals, and their explanations will be omitted. Regarding the same operations and advantages as those of the first embodiment, their explanations will be omitted.

[0148] 11 is a block diagram showing a control system of an image forming apparatus according to a second embodiment of the present invention.

[0149] In the first embodiment, a configuration for discarding fog toner is described. However, in a low humidity environment (eg, at 10% humidity), overcharged toner (ie, highly charged toner) may cause smearing. Therefore, in this second embodiment, a configuration for discarding such smudged toner is described.

[0150] As shown in FIG. 11 , in the second embodiment, the charging voltage control unit 21 , the developing voltage control unit 22 and the regulation blade control unit 23 are connected to the voltage s...

no. 3 example

[0231] 18 is a block diagram of a control system of an image forming apparatus according to a third embodiment of the present invention. The same components as those of the first or second embodiment are given the same reference numerals, and explanations thereof will be omitted. Regarding the same operations and advantages as those of the first or second embodiment, explanations thereof are omitted.

[0232] In the third embodiment, the charging voltage control unit 21 , the developing voltage control unit 22 and the regulating blade control unit 23 are connected to the voltage switching unit 51 . The voltage switching unit 51 includes a printing voltage setting unit 52 , a fogging toner discarding voltage setting unit 53 , and a stained toner discarding voltage setting unit 54 . According to an instruction from the recording control unit 30, the voltage switching unit 51 selects a voltage used during printing (held in the printing voltage setting unit 52), a voltage used du...

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PUM

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Abstract

An image forming apparatus includes a latent image bearing body that bears a latent image, a charging member applied with a charging voltage and configured to charge a surface of the latent image bearing body, a developer bearing body applied with a developing voltage and configured to develop the latent image with a developer, a developer regulating member applied with a regulating-member-application voltage and configured to form a layer of the developer on the developer bearing body, and a voltage switching unit configured to switch the regulating-member-application voltage. In a non-image-forming period, the voltage switching unit switches the regulating-member-application voltage from a voltage set for an image forming period to a different voltage.

Description

technical field [0001] The present invention relates to an image forming apparatus. Background technique [0002] Conventional image forming apparatuses such as printers, copiers, facsimile machines, complex machines, etc. are configured to form images as follows. The charging device evenly charges the surface of the photosensitive drum. An exposure device irradiates the surface of the photosensitive drum to form a latent image. Then, the developing device develops the latent image on the photosensitive drum with the toner to thereby form a toner image. The toner image is transferred to a recording medium, and fixed to the recording medium by a fixing device. [0003] In a developing device, a toner cartridge supplies toner (ie, developer) to a developing roller and a supply roller. The toner is electrically charged by frictional electrification at a portion between the developing roller and the supply roller and at a portion between the developing roller and the develop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08G03G15/02G03G15/00
Inventor 清水孝笃
Owner OKI DATA CORP
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