公开(公告)号：US20170176886A1

公开(公告)日：2017-06-22

申请号：US15367514

申请日：2016-12-02

申请人： Yuji NAGATOMO ,  Tetsumaru Fujita ,  Masato Tsuji ,  Yutaro Kaku

发明人： Yuji NAGATOMO ,  Tetsumaru Fujita ,  Masato Tsuji ,  Yutaro Kaku

IPC分类号： G03G15/08

CPC分类号： G03G15/0812

摘要： A developing device includes a developer bearer facing a latent image bearer, to rotate and supply developer to the latent image bearer, and a developer regulator to regulate an amount of the developer on a surface of the developer bearer. The developer regulator is in contact with the surface of the developer bearer. In the developing device, a ratio of a ten-point mean roughness of the developer regulator to a volume average particle diameter of the developer is not greater than 3.5%. The ratio is defined as Rzjis/Dv×100, where Rzjis represents the ten-point mean roughness measured in a nip-adjacent portion of a face of the developer regulator opposing the developer bearer, and Dv represents the volume average particle diameter of the developer. The nip-adjacent portion is adjacent to and downstream a downstream end of a regulation nip in a rotation direction of the developer bearer.

公开(公告)号：US10036976B2

公开(公告)日：2018-07-31

申请号：US15367514

申请日：2016-12-02

申请人： Yuji Nagatomo ,  Tetsumaru Fujita ,  Masato Tsuji ,  Yutaro Kaku

发明人： Yuji Nagatomo ,  Tetsumaru Fujita ,  Masato Tsuji ,  Yutaro Kaku

IPC分类号： G03G15/08

CPC分类号： G03G15/0812

摘要： A developing device includes a developer bearer facing a latent image bearer, to rotate and supply developer to the latent image bearer, and a developer regulator to regulate an amount of the developer on a surface of the developer bearer. The developer regulator is in contact with the surface of the developer bearer. In the developing device, a ratio of a ten-point mean roughness of the developer regulator to a volume average particle diameter of the developer is not greater than 3.5%. The ratio is defined as Rzjis/Dv×100, where Rzjis represents the ten-point mean roughness measured in a nip-adjacent portion of a face of the developer regulator opposing the developer bearer, and Dv represents the volume average particle diameter of the developer. The nip-adjacent portion is adjacent to and downstream a downstream end of a regulation nip in a rotation direction of the developer bearer.

公开(公告)号：US09958806B2

公开(公告)日：2018-05-01

申请号：US15346018

申请日：2016-11-08

申请人： Masato Tsuji ,  Tetsumaru Fujita ,  Yuji Nagatomo ,  Mitsutoshi Kichise ,  Yutaro Kaku ,  Kazuki Matsumoto

发明人： Masato Tsuji ,  Tetsumaru Fujita ,  Yuji Nagatomo ,  Mitsutoshi Kichise ,  Yutaro Kaku ,  Kazuki Matsumoto

IPC分类号： G03G15/08

CPC分类号： G03G15/0812

摘要： A developing device includes a toner bearer to rotate while bearing toner and a toner regulator including a bend on a free end side. The bend is disposed in contact with a surface of the toner bearer and defines a regulation nip to adjust an amount of the toner on the toner bearer. The toner regulator further includes an area having a water contact angle greater than or equal to 70 degrees. The area having the water contact angle includes, at least, a downstream end of the bend in a rotation direction of the toner bearer.