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    • 85. 发明申请
    • IMAGE FORMING APPARATUS
    • 图像形成装置
    • US20090257762A1
    • 2009-10-15
    • US12419768
    • 2009-04-07
    • Mitsutoshi Watanabe
    • Mitsutoshi Watanabe
    • G03G15/09
    • G03G9/1075G03G9/0804G03G9/0808G03G9/0819G03G9/09708G03G15/0849
    • In accordance with an embodiment of the embodiment of the invention, an image forming apparatus includes: an electrostatic image-bearing member; and a developing device. The developing device includes a developer-carrying member disposed to face the electrostatic image-bearing member, and a developer carried on the developer-carrying member. The developer includes a carrier having a volume-average particle size dc (μm) and a toner having a volume-average particle size dt (μm) of at most 5 μm and contained at a weight ratio C with respect to the carrier of from 5 to 10% and is controlled so as to provide a surface coverage F of the carrier with the toner of from 30 to 80% as calculated according to Formula (I): F=(¼)×(dc/dt)×(pc/pt)×C, wherein pc denotes a true specific gravity (−) of the carrier, pt denotes a toner absolute specific gravity (−), and C denotes a weight ratio (−) of the toner to the carrier.
    • 根据本发明的实施例的一个实施例,图像形成装置包括:静电图像承载部件; 和显影装置。 显影装置包括设置成面对静电图像承载部件的显影剂承载部件和承载在显影剂承载部件上的显影剂。 显影剂包括具有体积平均粒径dc(mum)的载体和体积平均粒径dt(mum)至多为5μm的调色剂,并且以相对于载体的重量比C为5 控制,以便根据式(I)计算,使载体的调色剂的表面覆盖度F为30至80%:F =(¼)×(dc / dt)×(pc / pt)xC,其中pc表示载体的真比重( - ),pt表示调色剂绝对比重( - ),C表示调色剂与载体的重量比( - )。