CARRIER FOR ELECTROSTATIC LATENT IMAGE DEVELOPER, TWO-COMPONENT DEVELOPER, IMAGE FORMING APPARATUS, PROCESS CARTRIDGE, AND IMAGE FORMING METHOD

• Main Authors: NAGAYAMA MASASHI, SUZUKI NAMIE, KISHIDA HIROYUKI, SUZUKI KOSUKE
• Format: Patent
• Language: English; Japanese
• Published: 16.12.2021
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide a carrier for electrostatic latent image developer that is excellent in resistance stability and can prevent variations in image quality over a long period.SOLUTION: A carrier for electrostatic latent image developer has a core material having magnetism and a resin layer covering the surface of the core material, and fine particles are included in the resin layer. The fine particle is a fine particle obtained by coating an inorganic pigment with tungsten-doped tin oxide or phosphor-doped tin oxide as conductive material. In the fine particle, the equivalent circle diameter R1(μm) of the inorganic pigment and the equivalent circle diameter R2(μm) of the fine particle satisfy the relationship of 4.0≤R2/R1≤7.0.SELECTED DRAWING: Figure 2 【課題】抵抗安定性に優れ、長期間に亘って画質の変動を抑えることができる静電潜像現像剤用キャリアを提供する。【解決手段】磁性を有する芯材とその表面を被覆する樹脂層とを有し、前記樹脂層中には微粒子が含まれ、前記微粒子は無機顔料に導電材としてタングステンドープ酸化スズまたはリンドープ酸化スズを皮膜した微粒子であり、前記微粒子の、前記無機顔料の円相当径Ｒ１（μｍ）と前記微粒子の円相当径Ｒ２（μｍ）とが４．０≦Ｒ２／Ｒ１≦７．０の関係を満たすことを特徴とする静電潜像現像剤用キャリア。【選択図】図２