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Image forming apparatus

An image and image carrier technology, which can be applied to corona discharge devices, electrical recording processes using charge patterns, equipment using electrical recording processes using charge patterns, etc., can solve problems such as toner fog, and reduce toner The effect of the occurrence of agent fog

Active Publication Date: 2015-06-24
KONICA MINOLTA BUSINESS TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the problem of toner fogging on the surface of photosensitive drums of other colors has arisen

Method used

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Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0025] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0026] "A Brief Configuration of the Image Forming Device"

[0027] figure 1 Among them, the image forming apparatus is, for example, a color printer using an electrophotographic method of a tandem method, and roughly includes a processing unit 10 (process) for forming a toner image of each color of Y, M, C, and K 10Y, 10M, 10C, 10K), an intermediate transfer unit 20 , a paper feeding unit 30 of, for example, a two-layer structure for accommodating recording paper P, and a fixing unit 35 .

[0028] Each processing unit 10 includes a photosensitive drum 11, a charging roller 12 as an example of a charging mechanism for the photosensitive drum 11, an exposure device 13, a developing device 14, and a cleaning device 15 for the photosensitive drum 11. The electrostatic latent images drawn on the respective photosensitive drums 11 are developed by a developer 14 to form...

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PUM

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Abstract

An image forming apparatus having; image supporting members provided for a plurality of colors; chargers to be impressed with charging biases to charge the respective image supporting members; developing devices to be impressed with developing biases to develop latent images formed on the image supporting members; a charging bias power supply, including high-voltage DC power supply circuits and an AC power supply circuit, for applying the charging biases, which are generated by superposition of direct-current voltages and an alternate-current voltage, to the chargers; and a control circuit that performs stop processing to stop applications of the charging biases and the developing biases. The control circuit performs processing to attenuate each of the direct-current voltages and each of the developing biases, and after all the direct-current voltages have become a predetermined stop potential, the control circuit performs processing to stop the outputs of the direct-current voltages and the alternate-current voltage.

Description

technical field [0001] The present invention relates to an image forming apparatus that charges a photosensitive drum with a charging bias voltage superimposed on a DC voltage and applies a developing bias to a developer to develop a latent image on the photosensitive drum. Background technique [0002] An image forming apparatus may include a charging roller that uses a photosensitive drum as a charging mechanism and is applied with a charging bias in which an AC voltage is superimposed on a DC voltage. [0003] In order to properly charge the photosensitive drums of Y (yellow), M (magenta), C (cyan), and K (black), well-known stabilization control is performed. For stabilization control, a DC high-voltage power supply circuit that generates a DC voltage for each color with its potential adjusted is provided for each color. In contrast, from the viewpoint of cost reduction, an AC power supply circuit common to multiple colors (for example, three colors Y, M, and C) may gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/02G03G15/06G03G15/01
CPCG03G15/0189G03G15/0283G03G15/065G03G15/01G03G15/02G03G15/06
Inventor 荒井淳一赤司裕纪
Owner KONICA MINOLTA BUSINESS TECH INC