CHARGING BRUSH, MANUFACTURING METHOD OF CHARGING BRUSH, AND ELECTROPHOTOGRAPHIC IMAGE FORMING APPARATUS

PROBLEM TO BE SOLVED: To provide a charging brush that can maintain high charge injection efficiency stably over time.SOLUTION: There is provided a charging brush comprising a conductive substrate and a conductive fiber electrically connected to the substrate, where the conductive fiber is a conductive area where an area at a depth of at least 100 nm to the center from the surface of the conductive fiber includes a binder resin 122 and conductive filler 121. A conductive area on the leading end 110-2 separated from the substrate of the conductive fiber further includes a conductive material 123 different from the conductive filler 121, and is a high-conductive area 110-2 that has a lower wire resistance than that of a conductive area 110-1 close to the substrate of the conductive fiber.SELECTED DRAWING: Figure 3 【課題】経時的に安定して高い電荷注入効率を持続することが可能な帯電ブラシを提供する。【解決手段】導電性の基体と、該基体に電気的に接続されている導電性繊維とを有する帯電ブラシであって、導電性繊維は、その長手方向断面において、導電性繊維の表面から中心に向かって少なくとも深さ１００ｎｍの領域が、バインダー樹脂１２２および導電性フィラー１２１を含む導電領域である。また、導電性繊維の基体から離れた、先端側の導電領域１１０−２は、導電性フィラー１２１とは異なる導電性物質１２３を更に含んでおり、導電性繊維の基体に近い側の導電領域１１０−１と比較して線抵抗が低い高導電領域１１０−２である。【選択図】図３