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Image forming device

一种图像、图像承载的技术，应用在应用电荷图形的电记录工艺、应用电荷图形的电记录工艺的设备、仪器等方向，能够解决图像浓度减小、图像质量低劣等问题，达到图像浓度减小的效果

Active Publication Date: 2016-04-20
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, the image density of the image forming apparatus continues to decrease, thus outputting dozens of prints with poor image quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (image forming device)

[0035] figure 1 is a diagram for describing the structure of the image forming apparatus in this embodiment. refer to figure 1 , the image forming device 80 is an intermediate transfer type monochrome printer in which an image forming portion 85 thereof is disposed on the top side of an intermediate transfer belt 81 thereof. The image forming apparatus 80 in this embodiment can output up to 25 A4-sized prints per minute in landscape mode.

[0036] In the image forming portion 85 , a toner image is formed on the photosensitive drum 13 and transferred onto the intermediate transfer belt 81 . Then, the toner image on the intermediate transfer belt 81 is transferred to the secondary transfer portion T2 where the toner image is transferred (secondary transferred) to the sheet of the recording medium. Material P. The separation roller 62 pulls the sheets in the cassette 60 out of the cassette 60 one by one, and sends each sheet P to a pair of reg...

Embodiment 2

[0111] (exposure adjustment factor)

[0112] Figure 10 is a flowchart of the image density adjustment control sequence in the second embodiment. Figure 11 is a graph for describing the relationship between the laser output setting and the exposure adjustment coefficient.

[0113] refer to Figure 10 together with figure 2 , the control section 100 starts the image density adjustment control sequence every 300 images (S11).

[0114]The control section 100 forms five test patches (toner images) different in intensity L of laser output (varied in steps). Then, it detects the test patch using the optical sensor 31, and calculates the amount LD by which the laser output L is to be set (S13).

[0115] After detection of test patches (toner images), such as Figure 8 As shown, the control section 100 sets the laser output value LD and the L adjustment coefficient based on the detection (measurement) result of the optical sensor 31 (S14).

[0116] The control part 100 refers...

Embodiment 3

[0149] Figure 15 is a flowchart of the image density adjustment control sequence in the third embodiment of the present invention. Figure 16 is a graph for describing the relationship between the DC voltage to be applied to the charging roller and the laser output setting. Figure 17 is a graph used to describe the relationship between the laser output setting and the L adjustment factor.

[0150] refer to Figure 10 , in the second embodiment, if the laser output L is set to a value LD close to the top end of the laser output range, when the TD ratio of the developer in the developing device 2 decreases, the laser output L is hardly increased in order to prevent A space where the image density of the image forming apparatus becomes unsatisfactory. In the third embodiment, therefore, in the case where the laser output L can be set to a value LD larger than the preset value, the absolute value of the potential level to which the photosensitive drum 13 is to be charged is i...

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PUM

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Abstract

Provided is an image forming device that comprises the following: an image supporting body that supports an image; a development device for developing, using a developer that includes a toner and a carrier, a latent image formed by exposing the image carrier which was charged; a sensor for detecting information related to the magnetization amount of developer per unit volume in the development device; and a control unit for, on the basis of the detection results of the sensor, controlling the image forming conditions so that development contrast changes, the development contrast being the difference in potential between an image unit potential of the maximum image density in the latent image, and development DC bias potential applied to the development device. The control unit, on the basis of the detection results of the sensor, controls the image forming conditions so that in a case where the magnetization amount of the developer per unit volume in the development device is a first prescribed value, the development contrast becomes smaller than in a case of a second prescribed value which is greater than the first prescribed value.

Description

technical field [0001] The present invention relates to an image forming apparatus whose developing portion forms an image using a developer containing toner and a carrier. Background technique [0002] There have been widely used image forming apparatuses which have an image bearing member, an exposing section, a developing section, a transferring section, and a fixing section, and in which the exposing section forms an electrostatic image on the image bearing member the developing part develops the electrostatic latent image into a toner image using a developer containing toner and carrier; the transferring part transfers the toner image onto a sheet of recording medium; A toner image is fixed to a sheet of recording medium. As the image forming operation continues, toner consumption continues. Therefore, the TD ratio (toner concentration: weight ratio of toner in the developer) of the developer in the developing portion decreases. As the TD ratio of the developer decre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00G03G15/08
CPCG03G15/065G03G15/0849G03G15/09
Inventor 冈田纪行
Owner CANON KK
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