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Image forming method and electronic photographing device using the same

A technology of image and shape factor, applied in electrography, instrument, developer, etc.

Inactive Publication Date: 2009-03-04
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the current environment, there is still room for further improvement of the overall performance

Method used

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  • Image forming method and electronic photographing device using the same
  • Image forming method and electronic photographing device using the same
  • Image forming method and electronic photographing device using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0384]Non-magnetic toner 1 and carrier 1 were blended at a toner concentration of 8%, thereby forming two-component developer No. 1.

[0385] Next, the electrophotographic photosensitive member 1 was assembled into a remodeled machine of an electrophotographic copier iRC6800 manufactured by CANON INC. (remodeled into a negative charging type) to be evaluated in the following manner.

[0386] First, under the environment of temperature 23° C. / humidity 50% RH, the condition of the potential is set so that the electrophotographic photosensitive member has a dark potential (Vd) of −700 V and a bright potential (Vl) of −200 V, and the electrons are adjusted. The initial potential of a photographic photosensitive member.

[0387] Next, a cleaning blade made of urethane rubber was set at a contact angle of 26 degrees with respect to the surface of the electrophotographic photosensitive member and a contact pressure of 0.294 N / cm (30 g / cm).

[0388] Then, using the above developer No...

Embodiment 2

[0411] An image reproduction test was performed in the same manner as in Example 1 except that the photosensitive member and developer used for image reproduction were changed as shown in Table 3. In addition, evaluation was performed in the same manner as in Example 1.

[0412] In the image forming method of this example, good cleaning performance was exhibited in low-density test chart reproduction, but line reproducibility in high-density test chart reproduction was inferior to that in Example 1. However, the torque did not rise during the durability test, so no image defects occurred throughout the durability test. Dot reproducibility is also good in a high-temperature, high-humidity environment. The evaluation results are shown in Table 3.

Embodiment 3 to 22

[0414] An image reproduction test was performed in the same manner as in Example 1 except that the photosensitive member and developer used for image reproduction were changed as shown in Table 3. In addition, evaluation was performed in the same manner as in Example 1.

[0415] In the image forming methods of these Examples, it was seen that the line reproducibility in the reproduction of the high-density test chart was insufficient in some cases. In all cases, however, good cleaning performance was shown in the low concentration test chart reproduction. The evaluation results are shown in Table 3. Wherein the photosensitive member surface profile index K (K=tan -1 ((Epc-Epch) / Edv) as the abscissa and the toner average circularity as the ordinate are plotted to show the evaluation results of the line reproducibility in the reproduction of the high density test chart is shown in FIG. 21 .

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PUM

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Abstract

An image forming method is disclosed having a charging step, an exposure step, a developing step and a transfer step. This method uses a toner which includes toner particles containing a binder resin and a colorant, and inorganic fine powder, and uses a photosensitive member which has on its surface depressed portions which are independent of one another. The depressed portions have openings having an average minor-axis diameter Lpc satisfying the relationship of Dg<Lpc<Dt (Dt represents the weight-average particle diameter of the toner, and Dg represents the maximum number-average particle diameter among number-average particle diameter(s) of one or two or more types of inorganic fine powder constituting the inorganic fine powder, and the toner has an average circularity of from 0.925 to 0.995.

Description

technical field [0001] The present invention relates to an image forming method and an electrophotographic apparatus using the image forming method. Background technique [0002] As an electrophotographic photosensitive member, in consideration of the advantages of low price and high productivity, it has a support and a photosensitive layer (organic photosensitive layer) provided thereon using an organic material as a photoconductive material (such as a charge generating material and a charge transporting material). ) organic electrophotographic photosensitive members have become popular. As an organic electrophotographic photosensitive member, an electrophotographic photosensitive member having a multilayer type photosensitive layer comprising a charge generating material such as a photoconductive A charge-generating layer of a photoconductive dye or a photoconductive pigment, and a charge-transporting layer containing a charge-transporting material such as a photoconducti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G5/147G03G5/00G03G5/047G03G9/08
CPCG03G9/08797G03G9/0819G03G9/0827G03G9/08795
Inventor 川原正隆植松弘规丸山晶夫大垣晴信大地敦岛田明寺本杏一菊地宪裕小金井昭雄角田隆行
Owner CANON KK
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