JPH0444653U

JPH0444653U -

Info

Publication number: JPH0444653U
Application number: JP8733390U
Authority: JP
Priority date: 1990-08-21
Filing date: 1990-08-21
Publication date: 1992-04-15

Description

[Brief explanation of the drawing]

第１図は、本考案一実施例の概略構成図、第２
図はその要部を示す図、第３図はその要部の拡大
図、第４図は中間調画像後端白抜けの発生のし易
さと、同極反発磁極の各磁束密度分布のピーク値
の比との相関特性を示す図、第５図は本例に対応
した磁束密度分布を示す図、第６図は同極反発磁
極を有さない場合の磁束密度分布を示す図、第７
図は本例における現像領域でのキヤリアチエーン
の挙動を模式的に示した図、第８図は磁力分布調
整用の磁石を用いない場合の現像領域におけるキ
ヤリアチエーンの挙動を模式的に示した図である
。１……潜像担持体としての感光体、２……現像
装置、５……現像剤担持体としての現像スリーブ
、１８……現像領域。 Figure 1 is a schematic configuration diagram of one embodiment of the present invention;
The figure shows the main part, Figure 3 is an enlarged view of the main part, and Figure 4 shows the ease of occurrence of white spots at the rear end of halftone images and the peak value of each magnetic flux density distribution of the same repulsive magnetic pole. FIG. 5 is a diagram showing the magnetic flux density distribution corresponding to this example. FIG. 6 is a diagram showing the magnetic flux density distribution when there is no homopolar repelling magnetic pole.
The figure is a diagram schematically showing the behavior of the carrier chain in the developing area in this example, and Figure 8 is a diagram schematically showing the behavior of the carrier chain in the developing area when no magnet is used for adjusting the magnetic force distribution. It is. DESCRIPTION OF SYMBOLS 1...Photoreceptor as a latent image carrier, 2...Developing device, 5...Developing sleeve as a developer carrier, 18...Developing area.

Claims

[Claims for Utility Model Registration] Comprising a developer carrier that is rotationally driven in one direction and has a plurality of magnetic poles fixedly arranged in the circumferential direction inside;
The developer is conveyed while being magnetically supported on the surface of the carrier by the magnetic force of the magnetic pole, and is formed on the latent image carrier in a development area where the latent image carrier and the developer carrier face each other. In a developing device that visualizes an electrostatic latent image by using a developer carried by a developer carrier and conveyed, a developing device for making the developer stand up in a developing region of the magnetic pole. The main pole has a pair of same-polarity repelling magnetic poles located in the moving direction of the developer carrier, and each of the pair of same-polarity repelling magnetic poles is positioned in the moving direction of the developer carrier among the pair of magnetic poles. On the other hand, when the peak values of the magnetic flux density distribution of each magnetic pole on the upstream side and the downstream side are respectively G ₁ and G ₂ , the ratio G ₁ /G ₂ of both falls within the range of 0.5 to 0.9. A developing device characterized by having magnetic poles with a magnetic flux density distribution.