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    Developing device, image forming apparatus and method of controlling developing device
    1.
    发明授权
    Developing device, image forming apparatus and method of controlling developing device 有权
    显影装置，图像形成装置和控制显影装置的方法

    公开(公告)号：EP2605074B1

    公开(公告)日：2018-05-02

    申请号：EP12196689.9

    申请日：2012-12-12

    申请人： Kyocera Document Solutions Inc.

    发明人： Fujihara, Kensuke ,  Watanabe, Akihiro ,  Fuchimoto, Nobuyuki

    IPC分类号： G03G15/06

    CPC分类号： G03G15/0907 ,  G03G15/065

    摘要： A developing device includes a development roller (11), a magnetic roller (12), a transformer (83), a switching portion (81), output control portion (80) and a capacitor (82). The development roller (11) is opposite a photoconductor drum (42). The magnetic roller (12) performs, with a magnetic brush, the supply of a toner to the development roller (11) and the removal of the toner. The transformer (83) generates an alternating-current voltage applied to the development roller (11). The switching portion (81) passes and interrupts a current to the transformer (83). The output control portion (80) stepwise changes, when a duty ratio in switching is changed, the duty ratio a plurality of times from a first duty ratio to a second duty ratio. The capacitor (82) has one end connected to the transformer (83) and the other end connected to the switching portion (81).

    DEVELOPING DEVICE AND IMAGE FORMING APPARATUS
    2.
    发明公开
    DEVELOPING DEVICE AND IMAGE FORMING APPARATUS 审中-公开
    开发设备和图像形成设备

    公开(公告)号：EP3195063A1

    公开(公告)日：2017-07-26

    申请号：EP15842282.4

    申请日：2015-08-31

    申请人： Ricoh Company, Ltd.

    发明人： IWATSUKI, Hitoshi ,  SAKATA, Koichi ,  TOHMATSU, Hiroshi ,  TANO, Toyoaki ,  MASHIKO, Kenichi ,  TAKII, Mariko ,  KISHIDA, Hiroyuki ,  MURASAWA, Yoshihiro ,  KONDOH, Keinosuke ,  KOIKE, Toshio ,  TAKAHASHI, Yutaka

    IPC分类号： G03G15/09 ,  G03G9/10 ,  G03G9/113 ,  G03G15/06 ,  G03G15/08

    CPC分类号： G03G15/0928 ,  G03G9/1136 ,  G03G9/1139 ,  G03G15/065 ,  G03G15/0907

    摘要： A developing device, including: a developer containing toner and carrier; and developer bearer configured to have surface thereof bear the developer and endlessly move, and to develop latent image over surface of latent image bearer by supplying toner in developer to latent image in developing region facing the latent image bearer, wherein carrier contains fine particles, value X in volume resistivity R (=10X) (Ω·cm) of carrier is 11.5-16.0, developer bearer includes: magnetic field generating unit including a plurality of magnetic poles; and developing sleeve having a cylindrical shape enclosing magnetic field generating unit, and configured to bear developer over outer circumferential surface of cylindrical shape by magnetic force of the magnetic field generating unit and perform surface moving by rotating relative to developing device body, and developing device includes developing sleeve voltage applying unit configured to apply AC component-containing voltage to developing sleeve.

    摘要翻译： 一种显影装置，包括：含有调色剂和载体的显影剂; 以及显影剂承载体，其构造为使其表面承载显影剂并且无限移动，并且通过将显影剂中的调色剂供给到面向潜像承载体的显影区域中的潜像而在潜像承载体的表面上显影潜像，其中载体包含微粒， 载体的体积电阻率R（= 10X）（Ω·cm）中的X为11.5-16.0，显影剂载体包括：包括多个磁极的磁场产生单元; 以及显影套筒，其具有包围磁场产生单元的圆筒形状，并且被配置为通过所述磁场产生单元的磁力将显影剂承载在圆筒形状的外周面上，并且通过相对于显影装置本体旋转来执行表面移动，并且显影装置包括 显影套筒电压施加单元，其被配置为向显影套筒施加包含AC分量的电压。

    Developing device and image forming apparatus and process cartridge incorporating same
    3.
    发明公开
    Developing device and image forming apparatus and process cartridge incorporating same 审中-公开
    显影装置及图像形成装置以及处理卡盒

    公开(公告)号：EP2905659A3

    公开(公告)日：2015-09-02

    申请号：EP15152870.0

    申请日：2015-01-28

    申请人： Ricoh Company, Ltd.

    发明人： Kondoh, Keinosuke ,  Tsuda, Kiyonori ,  Takahashi, Yutaka ,  Mikuniya, Kentaro ,  Koike, Toshio ,  Shiraishi, Emiko

    IPC分类号： G03G15/06 ,  G03G15/09

    CPC分类号： G03G15/0921 ,  G03G15/065 ,  G03G15/0907

    摘要： A developing device (5) includes a developer bearer (50) to carry, by rotation, developer including toner and magnetic carrier to a development range facing a latent image bearer (1) to bear a latent image. The developer bearer (50) includes a magnetic field generator (55) having multiple magnetic poles (P1, P2, P3, P4, P5) and a cylindrical developing sleeve (51) to rotate and bear developer on an outer circumferential surface thereof with magnetic force of the magnetic field generator (55) disposed inside the developing sleeve (51). The developing sleeve (51) receives development voltage including an AC component having a frequency of 2.0 kHz or lower, and a duty ratio of a component having a polarity opposite a toner normal charge polarity of the AC component is within a range from 4% to 20%.

    An image forming apparatus
    9.
    发明公开
    An image forming apparatus 失效
    一种图像形成设备

    公开(公告)号：EP0851314A2

    公开(公告)日：1998-07-01

    申请号：EP97122775.6

    申请日：1997-12-23

    申请人： CANON KABUSHIKI KAISHA

    发明人： Inoue, Masahiro ,  Kobayashi, Toshiaki ,  Waki, Kenichiro ,  Hibino, Masaru

    IPC分类号： G03G15/09

    CPC分类号： G03G15/065 ,  G03G15/0907 ,  G03G2215/0609

    摘要： An image forming apparatus includes an image bearing member for carrying an electrostatic image, the surface layer having a volume resistivity of 10 9 -10 13 Ω.cm; developing means for developing the electrostatic image on the image bearing member with a developer comprising toner and a carrier having a volume resistivity value of 10 6 -10 10 Ω.cm, while contacting chains of the carrier to the image bearing member, the developing means including a developer carrying member, opposed to the image bearing member, for carrying the developer and electric field forming means for forming an alternating electric field between the image bearing member and the developer carrying member; wherein the following is satisfied: 5x10 -5 1 -4 (sec); 5x10 -5 2 -4 (sec);

    where T 1 is a time duration in which the toner receives force away from the image bearing member toward the developer carrying member; T 2 is a time duration in which the toner receives force away from the developer carrying member toward the image bearing member.

    摘要翻译： 一种图像形成设备，包括：图像承载部件，用于承载静电图像，所述表面层具有109-1013Ω.cm的体积电阻率; 显影装置，用于在载体的链与载像元件接触的同时，用包含调色剂和体积电阻率值为106-1010Ω.cm的载体的显影剂使图像承载元件上的静电图像显影，所述显影装置包括显影剂 与图像承载部件相对，用于承载显影剂和电场形成装置，用于在图像承载部件和显影剂承载部件之间形成交变电场; 其中满足以下条件：5×10-5