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：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.

公开(公告)号：US20170146925A1

公开(公告)日：2017-05-25

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.

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：US20230297004A1

公开(公告)日：2023-09-21

申请号：US18183326

申请日：2023-03-14

申请人： Shogo Kezuka ,  Yasuhide Matsuno ,  Akihiro Kawasaki ,  Yutaro Kaku

发明人： Shogo Kezuka ,  Yasuhide Matsuno ,  Akihiro Kawasaki ,  Yutaro Kaku

IPC分类号： G03G15/08 ,  G03G9/08 ,  G03G15/02

CPC分类号： G03G15/0815 ,  G03G9/0825 ,  G03G15/0258

摘要： An image forming apparatus includes an image bearer, a charger, a developing device, and a transferor. The charger is disposed in contact with the image bearer to charge the image bearer. The developing device supplies toner to the image bearer to form a toner image on the image bearer. The transferor transfers the toner image on the image bearer to a recording medium or an intermediate transferor. The developing device collects transfer residual toner remaining on the image bearer after transfer of the toner image. The toner contains base particles and an external additive. The external additive has a volume average particle diameter of 5 nm or more and 50 nm or less. A content of the external additive is 1.8% by mass or less in the toner.