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Developing device and image forming apparatus

一种显影装置、图像的技术，应用在显影剂、应用电荷图形的电记录工艺、应用电荷图形的电记录工艺的设备等方向，能够解决带电性能下降、延迟显影剂、比重小等问题，达到带电特性稳定、抑制载体劣化的效果

Active Publication Date: 2014-07-23
KONICA MINOLTA INC
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, although the porous carrier has the advantage of being able to suppress deterioration due to its small specific gravity, the small specific gravity will also cause a decline in charging performance. Therefore, even if the automatic adjustment developing method is adopted, it is necessary to achieve a long-term and stable high-quality image quality for the purpose of delaying the life of the developer. I can't expect a sufficient effect for the purpose of the image

Method used

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Examples

Experimental program
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Embodiment

[0209] The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples.

[0210] Preparation of Carrier Core Particles

[0211] Preparation of Carrier Core Particles 1

[0212] With MnO: 35 mol%, MgO: 14.5 mol%, Fe 2 o 3 : 50 mol % and SrO: 0.5 mol %, the raw materials were weighed, mixed with water, and pulverized with a wet media mill for 5 hours to obtain a slurry.

[0213] The resulting slurry was dried with a spray dryer to obtain spherical particles. In order to adjust the bulk density, manganese carbonate was used as the MnO raw material, and magnesium hydroxide was used as the MgO raw material. After adjusting the particle size of the particles, they were calcined by heating at 950° C. for 2 hours. Next, as the bulk density decreases to obtain proper fluidity, stainless steel beads with a diameter of 0.3 cm are used to pulverize with a wet ball mill for 1 hour, and then zirconia micr...

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Abstract

The present invention provides a developing device and an image forming apparatus that prevent the degradation of a carrier to stabilize the electrical charge characteristics of a developer even after printing an image with a high coverage rate and stably provide high-quality images with no fogging over an extended period. The developing device includes a developer container, and a developing unit which develops an electrostatic latent image on an image carrier using a developer contained in the developer container. The developing device is characterized in that carrieres of the developer received in the developer container comprise more than two carriers of porous carriers and non-porous carriers of different bulk densities, the carrier forming a replenishment developer is a non-porous carrier, and a ratio of a poured bulk density of the carrier forming the replenishment developer to a poured bulk density of the carrier contained in the developer container ranges from 1.05 to 1.65.

Description

technical field [0001] The present invention relates to a developing device and an image forming device. More specifically, it relates to a developing device for forming an electrophotographic image capable of stably obtaining a high-quality image with high density and no fogging because the charge amount is stable even if it is used for a long period of time. Device and an electrophotographic image forming device including the developing device. Background technique [0002] Generally, in an electrophotographic image forming apparatus for office use, a two-component developer is mostly used as a main component. Regarding the two-component developer, the toner and the carrier are first mixed and stirred in the developing device to charge the toner, and then the toner is supplied to the surface of the photoreceptor to visualize (develop) the electrostatic latent image. Be visible. Therefore, only the toner is consumed by repeated development of the electrostatic latent imag...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G15/08G03G9/113G03G9/08G03G15/00
CPCG03G9/1075G03G15/0877G03G2215/0607G03G9/1085G03G15/0879
Inventor 中村公亮小鹤浩之松本好康
Owner KONICA MINOLTA INC
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