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Image forming apparatus

An imaging device and a constructed technology, which are applied in the direction of equipment, instruments, developers, etc., using an electrical recording process of charge patterns, can solve problems such as image quality degradation

Pending Publication Date: 2022-02-01
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When image formation is performed with dot toner images added when printing on types of recording media such as high-gloss paper, coated paper, and glossy paper, the added dot toner images may be conspicuous on the recording media , the recording medium may take on a yellowish tinge as a whole, and image quality may degrade

Method used

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Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0081] 1. Imaging equipment

[0082] The present invention specifically relates to an image forming apparatus using a so-called drum cleaner system that does not have a cleaner for an image bearing member.

[0083] figure 1 is a schematic diagram showing an example of a color imaging device. will refer to figure 1 The configuration and operation of the image forming apparatus of this embodiment are described. The image forming apparatus of this embodiment is a so-called tandem type printer in which image forming stations a to d are provided. The first imaging station a forms a yellow (Y) image. The second imaging station b forms a magenta (M) image. A third imaging station c forms a cyan (C) image. A fourth imaging station d forms a black (Bk) image. The construction of each imaging station is identical except for the color of the toner to be contained. Hereinafter, the configuration of each imaging station will be described by using the first imaging station a. Herei...

no. 3 example

[0434] The third embodiment has the following configuration.

[0435] The yellow station as the first imaging unit includes a rotatable first photoconductor drum 1a and a rotatable first developing roller 22a carrying the first toner particles and attached to the first toner particles. The surface of the carrier particles constitutes the first developer. The developing roller 22a contacts the first photoconductor drum 1a to form a first developing portion, and supplies the first developer to form a first developer image on the surface of the first photoconductor drum 1a in the first developing portion.

[0436] The magenta station as the second imaging unit includes a rotatable second photoconductor drum 1b and a rotatable second developing roller 22b carrying the second toner particles and attached to the second toner. The carrier particles on the surface of the particles constitute the second developer. The developing roller 22b contacts the second photoconductor drum 1b t...

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PUM

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Abstract

The invention relates to an image forming apparatus. The image forming apparatus includes a rotatable image bearing member and a rotatable developing member to carry developer made up of toner particles and carrier particles adhered to surfaces of the toner particles. Where a pressing force pressing the developing member against the image bearing member is F1, a total number of the carrier particles interposed between the toner particles and the image bearing member is N1, and an adhesion Ft between a carrier particle and a toner particle, measured when the carrier particle is pressed against the toner particle with F1 / N1 that is a pressing force per unit carrier particle, and an adhesion Fdr1 between the carrier particle and the image bearing member, measured when the carrier particle is pressed against the image bearing member with F1 / N1, satisfy Ft <= Fdr1.

Description

technical field [0001] The present disclosure relates to an image forming apparatus using electrophotographic processing and the like. Background technique [0002] In general, image forming apparatuses such as copiers and laser printers that perform image formation by using electrophotographic processing are known. [0003] In the transfer step, the image forming apparatus applies a voltage from a voltage source to a transfer member disposed in a region opposite to a photoconductor drum serving as an image bearing member to electrostatically transfer the toner image formed on the surface of the photoconductor drum. onto the intermediate transfer member or recording medium. When forming a multi-color toner image, a multi-color toner image is formed on the surface of an intermediate transfer member or a recording medium by sequentially performing a transfer step for each color toner image. The developer (toner) that has not been transferred from the photoconductor drum to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/16
CPCG03G15/1685G03G15/168G03G2221/1654G03G21/1821G03G2215/0607G03G15/1605G03G15/5008G03G15/0806G03G9/0819G03G9/0827G03G15/0813G03G15/065G03G15/02G03G2215/0604G03G15/161G03G21/0005
Inventor 铁野修一片桐真史安幸治横山裕子高桥亘石尾昌平田中孝幸松永智教
Owner CANON KK