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Image forming method and image forming device

A technology of image and imaging conditions, which is applied in the fields of electric recording process using charge pattern, equipment for electric recording process using charge pattern, and electric recording technique. Reduce toner concentration and other problems, and achieve the effects of effectively increasing toner concentration, stable developability, and stable developability

Inactive Publication Date: 2009-07-01
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conversely, at the frequency of use where the agitation stress per unit time becomes high, the toner concentration of the developer decreases, the charge amount of the toner increases, and the image density decreases, resulting in blurred characters, etc., resulting in a decrease in image quality.

Method used

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  • Image forming method and image forming device
  • Image forming method and image forming device
  • Image forming method and image forming device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0127] Figure 4 It is a sectional view showing the image forming apparatus according to Embodiment 1 of the present invention.

[0128] This image forming apparatus has: a photosensitive drum 1, a charging device 2, an exposure device 3, a developing device 4, a transfer device 5, a paper feeding unit 6, a fixing device 7, a toner cartridge 8, a cleaning device 9, an ATC sensor 10, a humidity sensor 11 and photoelectric sensor 12.

[0129] Figure 5 It is a block diagram showing the configuration of the image forming apparatus according to Embodiment 1 of the present invention.

[0130] The CPU 13 that constitutes the control section has: the A / D converter 14 that converts the analog output voltage value of the ATC sensor (toner concentration sensor) 10, the humidity sensor 11, and the photoelectric sensor 12 into a digital output voltage value; ; a developing bias driving circuit 20; a control device 15 for controlling the developing device driving motor 18 and the toner ...

Embodiment approach 2

[0216] Depending on the frequency of use of the device by the user for copying or printing, the developer stirring stress per predetermined time varies. This difference in the stirring stress of the developer per predetermined unit time causes a difference in the charge amount of the toner. As a result, although the toner concentration is the same, the output voltage value of the ATC sensor 10 is different, and the stirring stress per unit time is lower. In the developer with a small device usage frequency, the toner concentration increases and the charge amount decreases, causing toner scattering, toner adhesion to areas without images, or image damage, resulting in lower image quality. Conversely, in a developer with a high stirring stress per unit time and a device usage frequency, the toner density decreases, the charge amount increases, and the image density decreases, such as blurring of characters, resulting in a decrease in image quality.

[0217] According to the pres...

Embodiment approach 3

[0245] Figure 20 ~ Figure 22 It is a flowchart showing the correction processing procedure of the reference output voltage value based on the change in humidity and the frequency of use of the device by the control device 15 according to the third embodiment.

[0246] When starting up by turning on the power or the like, first, the CPU 13 of the image forming apparatus judges whether or not it is time to implement process control (step S51 ). The execution timing of the process control is a timing that requires control, such as when the power is turned on, after a predetermined time has elapsed since the power is turned on, or after a predetermined number of copies has been completed.

[0247] In step S51, when it is judged that it is not the execution time of the process control, the normal copying operation is repeated until the execution time (step S52).

[0248] In step S51, when it is determined that it is time to implement process control, charging, exposure, and devel...

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Abstract

A reference developed image is formed on a photosensitive drum under preset imaging conditions, and the density of the reference developed image is detected. Correct the developing bias voltage according to the detection result, and when the corrected value of the developing bias voltage exceeds the specified range, correct and detect the humidity in the developing device according to the humidity detection value near the developing device, the frequency of use of the device, and the agitation stress of the developer. The reference output voltage of the ATC sensor for toner density.

Description

technical field [0001] The present invention relates to an image forming method and an image forming apparatus such as an electrophotographic copier, a laser printer, or a facsimile apparatus used for carrying out the image forming method. More specifically, the present invention relates to the following image forming method and image forming apparatus. In a developing device for developing an electrostatic latent image using a two-component developer composed of toner and a carrier, a toner concentration detection unit for measuring the magnetic permeability of the developer is provided, and the toner concentration detected by the toner concentration detection unit is According to the difference between the output voltage value and the reference output voltage value, the amount of toner replenished to the developing device is controlled so that the output voltage value coincides with the reference output voltage value. Background technique [0002] A conventional image form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08G03G15/00
Inventor 糸山元幸藤田庄一崎田裕史森国修市
Owner SHARP KK
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