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Magnetic carrier, two-component developer, developing unit, developing device, image-forming apparatus, and image-forming method

A technology of magnetic carrier and developing unit, which is applied in the direction of developer, electric recording process applying charge pattern, equipment applying electric recording process of electric charge pattern, etc., can solve problems such as increasing adhesion, and achieve the effect of stable output

Inactive Publication Date: 2010-03-24
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the average particle size of the carrier becomes smaller, the magnetic brush can be softened and densified, which is more conducive to the development of the electrostatic latent image pattern faithfully, but it will increase the impact of the small particle size carrier on the image part and the non-image part. attach
Regarding these issues, studies on magnetic force and carrier resistance, and studies on carrier resistance and surface properties (for example, refer to Patent Document 3) are still going on, but they have not yet been resolved.

Method used

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  • Magnetic carrier, two-component developer, developing unit, developing device, image-forming apparatus, and image-forming method
  • Magnetic carrier, two-component developer, developing unit, developing device, image-forming apparatus, and image-forming method
  • Magnetic carrier, two-component developer, developing unit, developing device, image-forming apparatus, and image-forming method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0128] According to the method described above (Preparation of Resin-Coated Carrier), a resin-coated carrier was produced by applying a coating resin solution in which the content of the charge control agent was gradually changed in units of 5 parts by weight within the range of 0 to 20 parts by weight. . The resistance value of each resin-coated carrier was measured according to the method described above (Measurement of Resistance Value of Carrier Particles).

[0129] In addition, using the toner for cyan color evaluation prepared by the method described above (Preparation of toner), and each of the above-prepared resin-coated carriers containing conductive particles in different amounts (different in electrical resistance), two samples were produced. Component developer. The two-component developer is injected into the developing cartridge A. Using the test bench described above (evaluation of the degree of image blurring of carrier adhesion and background part), after id...

Embodiment 2

[0146] Magnetic core particles having different resistance values ​​were prepared, and the resistance value was measured according to the above (measurement of resistance value of magnetic core particles). Next, the surfaces of the magnetic core particles having these resistance values ​​were coated with resin according to the method described above (Preparation of Resin-Coated Carrier) to prepare a resin-coated carrier.

[0147] Next, a two-component developer was prepared by using the toner for cyan color evaluation prepared by the method described above (Preparation of Toner) and resin-coated carriers each having a different resistance. Inject each two-component developer into the developing ink cartridge A respectively, apply the test bench described in the above (evaluation of the degree of image blurring of carrier adhesion and background part), and carry out idling for 3 minutes under normal temperature and normal humidity conditions, and then apply the test bench to the...

Embodiment 3

[0153] A resin-coated carrier was produced by preparing magnetic core particles having different volume-average particle diameters and performing resin coating according to the method described above (Preparation of Resin-Coated Carrier). Next, each resin-coated carrier produced using magnetic core particles having different volume average particle diameters was evaluated in accordance with the above (evaluation of degree of carrier adhesion and background part image blurring). The evaluation results are shown in Table 3.

[0154] [table 3]

[0155]

[0156] It can be seen from Table 3 that when the volume average particle diameter of the resin-coated carrier is 20 μm or less, the magnetic roller wrapped in the developer carrier will reduce the holding force of the resin-coated carrier, and the resin-coated carrier will easily adhere to static electricity. Latent image carrier surface. Furthermore, it tends to be unevenly mixed with the toner, and the charge distribution ...

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Abstract

In a magnetic carrier, the surface of a magnetic body core material is coated with a coating layer containing conductive particles and a charge control agent composed of the same components as the charge control agent contained in the toner for electrophotograph. Furthermore, the electric resistance of the magnetic carrier under an electric field of 4 x 103 V / cm is from 8.22 x 107 to 1.12 x 1010 Ocm. The ability of charging the toner for electrophotograph can be sustained even after a long time.

Description

technical field [0001] The present invention relates to a magnetic carrier used in developing an electrostatic latent image pattern in an image forming method using electrophotography, a two-component developer containing the magnetic carrier and toner, an image forming apparatus using the developer, and image forming method. Background technique [0002] Copiers, printers, facsimile machines, and the like have been widely used as image forming apparatuses to which electrophotography is applied. An image forming device using an electrophotographic method forms an image on a recording paper through a charging process, an exposure process, a development process, a transfer process, a cleaning process, and a fixing process. The developer used here is classified into a two-component electrophotographic developer and a one-component electrophotographic developer. A two-component developer for electrophotography consists of a toner for developing an electrostatic latent image an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/113G03G9/097G03G15/01
CPCG03G2215/0607G03G9/107G03G9/1131G03G9/0819G03G9/1136G03G15/09G03G9/1139
Inventor 吉冈伸之岩松正武藤吉纪平川弘幸原高志加本贵则
Owner SHARP KK
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