JPH0314665U

JPH0314665U -

Info

Publication number: JPH0314665U
Application number: JP7487389U
Authority: JP
Priority date: 1989-06-28
Filing date: 1989-06-28
Publication date: 1991-02-14

Description

[Brief explanation of the drawing]

第１図は本考案に係る現像装置の概略構成を示
す説明図、第２図は本考案に係る画像形成装置の
概略構成を示す説明図、第３図及び第４図は本考
案の現像装置の第一実施例を示す断面図及び平面
図、第５図は第４図の−断面図、第６図は第
一実施例に係るマグネツト部材を示す断面図、第
７図は第一実施例に係る現像剤担持体の現像主極
の磁束密度分布を示す説明図、第８図は第二実施
例に係る画像形成装置を示す概略図である。符号の説明、１……現像剤担持体、５……潜像
担持体、６……潜像形成手段、７……現像手段、
８……記録シート、９……転写手段、１１……マ
グネツト部材、Ｎ１……第一主極、Ｎ２……第二
主極、Ｄ……現像領域。 FIG. 1 is an explanatory diagram showing a schematic configuration of a developing device according to the present invention, FIG. 2 is an explanatory diagram showing a schematic configuration of an image forming apparatus according to the present invention, and FIGS. 3 and 4 are an explanatory diagram showing a schematic configuration of a developing device according to the present invention. 5 is a cross-sectional view of FIG. 4, FIG. 6 is a sectional view showing the magnet member according to the first embodiment, and FIG. 7 is a cross-sectional view of the magnet member according to the first embodiment. FIG. 8 is an explanatory diagram showing the magnetic flux density distribution of the main developing pole of the developer carrier according to the second embodiment, and FIG. 8 is a schematic diagram showing the image forming apparatus according to the second embodiment. Explanation of symbols: 1...Developer carrier, 5...Latent image carrier, 6...Latent image forming means, 7...Developing means,
8... Recording sheet, 9... Transfer means, 11... Magnetic member, N1... First main pole, N2... Second main pole, D... Development area.

Claims

[Claims for Utility Model Registration] (1) A magnetic member consisting of a plurality of arranged magnetic poles is provided inside to form a magnetic brush of a two-component developer consisting of toner and magnetic carrier to form a latent image carrier. In a developing device equipped with a developer carrier that develops an electrostatic latent image, the magnetic member is composed of a pair of repelling magnetic poles whose magnetic poles facing the latent image carrier are reciprocal to each other; If the magnetic force of the repulsive magnetic pole located on the upstream side in the rotational direction of the latent image carrier is A, and the magnetic force of the repulsive magnetic pole located on the downstream side in the rotational direction of the latent image carrier is B, then the relationship A<B. A developing device characterized by: (2) a latent image carrier, a latent image forming means for forming a plurality of latent images on the latent image carrier, and a plurality of developing means for visualizing the plurality of latent images with toner;
In an image forming apparatus equipped with a transfer means for transferring a plurality of toner images on a latent image carrier to a recording sheet at once, at least the second and subsequent stages of development means have a magnetic member formed by arranging a plurality of magnetic poles inside. A developer carrier is provided, and a magnetic brush of a two-component developer made of toner and a magnetic carrier is formed between the developer carrier and the latent image carrier, and the magnetic member faces the latent image carrier. Consisting of a pair of repulsive magnetic poles whose magnetic poles are opposite to each other, the pair of repulsive magnetic poles has a magnetic force A of the repulsive magnetic pole located on the upstream side in the rotational direction of the latent image carrier, and A on the downstream side in the rotational direction of the latent image carrier. The magnetic force of the repulsive magnetic pole located at B
An image forming apparatus characterized in that the relationship A<B holds. (3) The developing device according to claim 1 or 2, wherein the magnetic pole of the magnetic member facing the latent image carrier is constituted by a rare earth magnet.