DEVELOPER CARRIER, PROCESS CARTRIDGE, AND ELECTRONIC PHOTOGRAPH IMAGE FORMATION DEVICE

PROBLEM TO BE SOLVED: To provide a developer carrier with which it is possible to suppress a change of roller surface potential that occurs due to a change of drum potential after solid white image formation or at the time of solid white image formation, and maintain excellent toner conveyance ability.SOLUTION: Provided is a developer carrier comprising a base medium, an insulating layer on the base medium, and a plurality of conductive domains on the insulating layer, characterized in that the surface of the developer carrier includes at least a portion covered with the conductive domains and an exposed portion of the insulating layer not covered with the conductive domains, the conductive domains forming a protrusion, the Martens hardness of the insulating layer being 0.3 N/mmto 10.0 N/mminclusive, the Martens hardness of the conductive domains being 10.0 N/mmto 500.0 N/mminclusive, and the Martens hardness of the conductive domains being larger than the Martens hardness of the insulating layer.SELECTED DRAWING: Figure 2 【課題】ベタ白画像形成後時またはベタ黒画像形成時におけるドラム電位の変化により生じる、ローラ表面電位の変化を抑制し、かつ良質なトナー搬送性を維持し得る現像剤担持体の提供。【解決手段】基体と、該基体上の絶縁層と、該絶縁層上の複数個の導電性ドメインと、を有する現像剤担持体であって、該現像剤担持体の表面は、少なくとも、該導電性ドメインで被覆された部分と、該導電性ドメインで被覆されていない該絶縁層の露出部分とを含み、該導電性ドメインが該絶縁層に対して凸部を形成し、該絶縁層のマルテンス硬度が０．３Ｎ／ｍｍ２以上、１０．０Ｎ／ｍｍ２以下であり、該導電性ドメインのマルテンス硬度が１０．０Ｎ／ｍｍ２以上、５００．０Ｎ／ｍｍ２以下であり、該導電性ドメインのマルテンス硬度が該絶縁層のマルテンス硬度より大きいことを特徴とする現像剤担持体。【選択図】図２