DEVELOPING DEVICE, PROCESS CARTRIDGE, AND IMAGE FORMING APPARATUS
To prevent the occurrence of uneven coating, while improving the electrification characteristics of a developer coat layer formed on a developer carrier.SOLUTION: A developer used in a developing device including a metal blade has a toner base particle and an external additive. The external additive...
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| Sprache: | eng ; jpn |
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| Zusammenfassung: | To prevent the occurrence of uneven coating, while improving the electrification characteristics of a developer coat layer formed on a developer carrier.SOLUTION: A developer used in a developing device including a metal blade has a toner base particle and an external additive. The external additive includes silica fine particles having a particle diameter of 5 nm or more and 25 nm or less, and inorganic spacer particles having a particle diameter of 50 nm or more and 150 nm or less. On the surface of the toner base particles, the area occupation rate of the silica fine particles is 40% or more.SELECTED DRAWING: Figure 3
【課題】 現像剤担持体に形成された現像剤コート層の帯電性を向上しつつ、コートムラの発生を抑制できることを目的とする。【解決手段】 金属ブレードを備える現像装置に使用される現像剤は、トナー母粒子と、外添剤と、を有し、外添剤は、粒径が５ｎｍ以上かつ２５ｎｍ以下のシリカ微粒子粒径と、５０ｎｍ以上かつ１５０ｎｍ以下の無機スペーサ粒子と、を含み、トナー母粒子の表面において、シリカ微粒子の面積占有率は、４０％以上である。【選択図】 図３ |
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