IMAGE FORMING APPARATUS AND PROCESS CARTRIDGE

• Main Authors: FUKUDA YUSUKE, KITAJIMA KATSUYUKI, KURIBAYASHI MASATAKA, OTA NAOKI
• Format: Patent
• Language: English; Japanese
• Published: 01.04.2021
• Subjects: CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; HOLOGRAPHY; MAGNETOGRAPHY; PHOTOGRAPHY; PHYSICS

To provide an image forming apparatus that prevents wear of a cleaning blade, while maintaining high efficiency in transfer from an intermediate transfer body.SOLUTION: An image forming apparatus comprises: an image holding body; charging means; electrostatic charge image forming means; developing means that stores an electrostatic charge image developer including a toner for electrostatic charge image development including toner particles, and silica particles having a number average particle diameter of 110 nm or more and 130 nm or less, a large diameter-side number grain size distribution index (upper GSDp) of less than 1.080, an average circularity of 0.94 or more and 0.98 or less, and a ratio of particles with a circularity of 0.92 or more of 80 number% or more; transfer means having an intermediate transfer body that includes a base material and an elastic layer including spherical particles, primary transfer means that primarily transfers a toner image formed on a surface of the image holding body to a surface of the intermediate transfer body, and secondary transfer means that secondarily transfers the toner image transferred to the surface of the intermediate transfer body to a surface of a recording medium; and cleaning means.SELECTED DRAWING: Figure 1 【課題】中間転写体からの高い転写効率を維持しつつクリーニングブレードの摩耗を抑制する画像形成装置を提供すること。【解決手段】像保持体と、帯電手段と、静電荷像形成手段と、トナー粒子と、個数平均粒子径が１１０ｎｍ以上１３０ｎｍ以下、大径側個数粒度分布指標（上側ＧＳＤｐ）が１．０８０未満であり、平均円形度が０．９４以上０．９８以下であり、且つ、円形度が０．９２以上の割合が８０個数％以上であるシリカ粒子とを含有する静電荷像現像用トナーを含む静電荷像現像剤を収容する現像手段と、基材と球状粒子を含む弾性層とを備える中間転写体と、前記像保持体の表面に形成されたトナー画像を前記中間転写体の表面に一次転写する一次転写手段と、前記中間転写体の表面に転写されたトナー画像を記録媒体の表面に二次転写する二次転写手段と、を有する転写手段と、清掃手段と、を含む、画像形成装置である。【選択図】図１