| 摘要 |
PURPOSE:To prevent the contact or excessive approach of a developer head to suppress color mixture or stripping, and prevent deterioration of image by setting, in interpole developing method, the interpole opening angle of magnetic poles, the radius of an image carrier, and the radius of a developing sleeve within specified ranges. CONSTITUTION:In order to prevent the contact or excessive approach of a developer head to an image carrier, when the interpole opening angle of magnetic poles is theta, the radius of the image carrier is Rpc, the radius of the developing sleeve is Rs1, and the distance between the image carrier and the developing sleeve is Dsd, the length obtained by adding the maximum head height on the magnetic pole before development to the developing sleeve radius Rs1 is C2, and the length obtained by adding the distance Dsd between image carrier and developing sleeve in the normal direction on the pole to the developing sleeve radius Rs1 is C1, they are set so that the conditions represented by the expressions can be established. Thus, the contact, color mixture, and stripping by the contact or excessive approach of the developer head in interpole developing method can be suppressed to prevent deterioration of image. |
