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Image forming apparatus and method of forming an image

By adjusting the exposure based on the image data in the image forming device, the problem of uneven image density caused by development memory is solved, and the uniformity of the image density and the stability of the exposure are achieved.

Inactive Publication Date: 2014-12-03
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the technique described in the above-mentioned Patent Document 1, there is a problem that the developer deteriorates due to the friction between the developer adhering to the sleeve and the developer inside the developing device, and the life of the developer is shortened.
[0014] In addition, in the technique described in the above-mentioned Patent Document 2, especially in the case of using a toner with a charge amount of 50 [μC / g] or more, there may be cases where residual toner on the surface of the developer carrier can be completely removed. part of the agent, and the part that cannot be completely removed
In addition, when the residual toner on the surface of the developer carrier is non-static and has strong adhesion, it is difficult to remove the residual toner by using an electric field, and it is easy to generate a completely removable portion and failure. parts that can be completely removed
In this case, there is a problem that the development history on the developer carrier cannot be sufficiently suppressed.
[0015] In addition, in the technique described in Patent Document 3 above, when the charge amount of the toner adhering to the surface of the developing roller exceeds 50 [μC / g], the adhesion force of the toner to the surface of the developing roller is weak. strong, the problem that the toner cannot be sufficiently removed from the surface of the developing roller by scraping only by the magnetic brush
[0016] As described above, the technologies described in the above-mentioned Patent Documents 1 to 3 have the above-mentioned problems, and it is not possible to directly solve the problem of developing memory due to the non-uniformity of the toner layer potential on the surface of the developing sleeve. Apply the technology described in the above-mentioned patent documents 1 to 3

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0035] Hereinafter, the first embodiment will be described in detail based on the drawings.

[0036] [Configuration of Image Forming Apparatus 100 ]

[0037] figure 2The illustrated image forming apparatus 100 forms an image on recording paper through an electrophotographic process. Image forming apparatus 100 includes control unit 101 , document reading unit 110 , operation display unit 120 , image processing unit 130 , image forming unit 140 , conveyance unit 150 , fixing unit 160 , communication unit 171 , and storage unit 172 . Among them, the control unit 101 also functions as an estimation unit.

[0038] The control unit 101 includes a CPU (Central Processing Unit) 102, a ROM (Read Only Memory) 103, a RAM (Random Access Memory) 104, and the like. CPU 102 reads out a program corresponding to the processing content from ROM 103 , expands it into RAM 104 , and controls the operation of each block of image forming apparatus 100 in cooperation with the expanded program. ...

no. 2 Embodiment approach

[0122]Hereinafter, the second embodiment will be described in detail based on the drawings. Since the basic configuration of the image forming apparatus 100 is the same as that of the first embodiment, description thereof will be omitted. The difference from the first embodiment lies in the correction operation of the digital image data performed by the image forming apparatus 100 . In the present embodiment, the image processing unit 130 corrects the digital image data when the gradation value at the position where the density drop occurs is 100 or more and less than 240. That is, according to the experimental results conducted in advance, it was confirmed that the decrease in the density due to the development memory is relatively small in an image having a gray scale value of less than 100 and 240 or more.

[0123] [Operation of Image Forming Apparatus 100 ]

[0124] Next, refer to Figure 9 The flow chart of FIG. 2 describes the correction operation of the digital image...

Embodiment 1

[0149] [Configuration of Image Forming Apparatus According to Embodiments 1 and 2]

[0150] As an image forming apparatus for experiments, a figure 2 , 3 configuration of the image forming apparatus 100. In the image forming apparatus 100 according to the first embodiment, the image forming operation described in the first embodiment is performed. In the image forming apparatus 100 according to the second embodiment, the image forming operation described in the second embodiment is performed.

[0151] [Configuration of Image Forming Apparatus According to Comparative Example]

[0152] As an image forming apparatus for experiments, a device with figure 2 , 3 In the image forming apparatus 100 having the above configuration, a toner recovery roller facing the developing roller 206 is provided. The toner recovery roller rubs the surface of the developing roller 206 by forming a magnetic brush due to the magnetic force of the magnetic poles provided inside, and removes the...

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PUM

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Abstract

An image forming apparatus includes: an image forming section including a light exposure section configured to expose an image bearing member to light to form an electrostatic latent image, the image forming section being configured to form a toner image on the image bearing member, and to form an image on a recording sheet by transferring the toner image onto the recording sheet; an estimation section configured to estimate a density lowering position on the basis of image data of an image formed by the image forming section, the density lowering position being a position where decrease in image density relative to a predetermined image density is caused in the image; and a control section configured to increase a light exposure amount at the density lowering position estimated by the estimation section on the image bearing member to an amount greater than a predetermined light exposure amount.

Description

technical field [0001] The present invention relates to an image forming apparatus and an image forming method. Background technique [0002] In an electrophotographic image forming apparatus, an electrostatic latent image is formed by charging the surface of a photosensitive drum, exposing its charged area according to image data, and developing the formed electrostatic latent image to make it visible (development). ) of the developing device. [0003] In this developing device, a two-component developer including a carrier and a toner is used, and the electrostatic latent image formed on the surface of the photosensitive drum is imaged by frictionally charging the toner and being attracted by the electrostatic force of the electrostatic latent image formed on the surface of the photosensitive drum. Developed to form a toner image. [0004] The developing roller of the developing device has a plurality of magnetic poles inside and a cylindrical developing sleeve rotatably...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/00
CPCG03G15/043G03G13/04
Owner KONICA MINOLTA INC