Developer carrier and developing device

A developer and carrier technology, applied in the field of developing devices, can solve the problems of reduced toner charge, large resistance value change of resin coating layer, insufficient concentration stability or fog, etc., to achieve lubricity and wear resistance excellent effect

Active Publication Date: 2009-06-03
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, by adding an ion conductive agent, there is an effect of suppressing the charging phenomenon of the toner, but the humidity dependence of the ion conductive agent is high
Therefore, the resistance value of the resin coating layer fluctuates greatly, especially in a high-temperature and high-humidity environment, the charge amount of the toner decreases, and it is not sufficient in terms of concentration stability or fogging during long-term use.

Method used

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  • Developer carrier and developing device
  • Developer carrier and developing device
  • Developer carrier and developing device

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0168]

[0169] Carbon black (hereinafter also referred to as "CB") with an average primary particle size of 14nm to 95nm is filled into a graphite crucible, heat-treated at 2000°C to 3200°C in a nitrogen atmosphere, and then graphitized to obtain graphite Carbon black (hereinafter also referred to as graphitized CB) A-1 to A-6. The measured physical property values ​​of the obtained graphitized carbon blacks A-1 to A-6 are shown in Table 1. Table 1 also records the physical properties of carbon blacks a-1 to a-3 not subjected to graphitization treatment and carbon black a-4 prepared by changing the conditions of graphitization treatment. The temperature during the graphitization treatment is also described in Table 1.

[0170] Carbon black not subjected to graphitization treatment and raw material carbon black of graphitization treatment are as follows.

[0171] CB a-1: TOKA BLACK # 5500 (brand name) manufactured by TOKAI CARBON CO., LTD.

[0172] CB a-2: Ketjenblack EC-...

Embodiment 1

[0208] The developer carrier B-1 was evaluated according to the method shown below using a modified machine of a commercially available laser beam printer LBP-2510 (manufactured by Canon Co., Ltd., trade name).

[0209] First, remove the electrification auxiliary roller mounted on the developer carrier from the cyan process cartridge EP-85 (Canon Co., Ltd., trade name) for LBP-2510, fill the cyan process cartridge with developer 1, and then assemble the developing machine. Agent carrier B-1. And the rollers installed on the left and right sides of the developer carrier were replaced with rollers with a larger diameter, so that the gap distance between the developer carrier and the photosensitive drum was 280 μm. This modified cyan process cartridge was installed in the cyan position of the printer LBP-2510, and a dummy cartridge (dummy cartridge) was installed in another position, and monochrome evaluation was performed.

[0210] A schematic diagram of the developing device i...

Embodiment 2～6 and comparative example 1～4

[0252] The developer carriers B-2 to B-7 and b-1 to b-4 were respectively used as the developer carriers, and assembled into the process cartridge in the same manner as in Example 1, and then, in the same manner as in Example 1, Perform image evaluation. The results are shown in Table 3.

[0253] [table 3]

[0254]

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Abstract

A developer carrying member is provided which, even in continuous copying over a long term and also even under different environmental conditions, do not cause any charge-up of toner, and prevent the toner from melt-adherent to the developer carrying member surface and developer layer thickness control member surface to maintain the state of uniform coating of a developer having a toner and to make the toner uniformly and quickly triboelectrically charged, so as to obtain high-grade images free of any image density decrease, image density non-uniformity, sleeve ghosts, fog and vertical streaks during running service. Provided are a developer carrying member having a substrate and a resin coat layer on the surface of the substrate, which resin coat layer contains at least a binder resin and a carbon black, where the graphite (002) plane obtained from X-ray diffraction of the carbon black has a lattice spacing of from 0.3370 nm or more to 0.3450 nm or less; and a developing assembly having such a developer carrying member.

Description

technical field [0001] The present invention relates to a developer carrier for developing an electrostatic latent image carrier such as an electrophotographic photoreceptor or an electrostatic recording medium in an electrophotography method, and a developing device equipped with the developer carrier. electrostatic latent image. Background technique [0002] At present, as the electrophotography method, various methods are known. Generally, a photoconductive substance is used to form an electrostatic latent image on an electrostatic latent image carrier such as a photoreceptor by various methods, and then a developer containing a toner is used to form an electrostatic latent image. The electrostatic latent image is developed, and if necessary, the toner image is transferred to a transfer material such as paper, and then the toner image is fixed on the transfer material by heat, pressure, etc. to obtain a copy. [0003] In recent years, the technical direction of electroph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/08
Inventor 岛村正良后关康秀明石恭尚齐木一纪大竹智道上宁子伊藤稔
Owner CANON KK
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