公开(公告)号：US20220026824A1

公开(公告)日：2022-01-27

申请号：US17311473

申请日：2020-02-25

Applicant: NOK CORPORATION

Inventor： Asami UEMATSU ,  Atsushi IKEDA ,  Shogo SUZUKI ,  Kosuke OURA ,  Satoshi FUKUOKA ,  Kenji SASAKI

IPC: G03G15/02

Abstract: A charging roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The ten point height of irregularities RZ of a surface of the surface layer is equal to or greater than 6.5 micrometers, and is equal to or less than 11.7 micrometers. The mean spacing between peaks Sm of the surface of the surface layer is equal to or greater than 16.5 micrometers and is equal to or less than 18.8 micrometers.

公开(公告)号：US20220252996A1

公开(公告)日：2022-08-11

申请号：US17630546

申请日：2019-08-29

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Shogo SUZUKI ,  Satoshi HUKUOKA ,  Kenji SASAKI

IPC: G03G15/02

Abstract: An electroconductive roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The arithmetic mean peak curvature Spc of a surface of the surface layer is equal to or greater than 1,880 (1/mm), and is equal to or less than 14,024 (1/mm) The density of peaks Spd of the surface of the surface layer is equal to or greater than 93,406 (1/mm2), and is equal to or less than 151,476 (1/mm2). The surface area of the surface layer per unit projected area is equal to or greater than 1.255, and is equal to or less than 5.132.

公开(公告)号：US20240142890A1

公开(公告)日：2024-05-02

申请号：US18273185

申请日：2021-12-03

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Norimasa HOSONUMA ,  Atsushi IKEDA ,  Yu AKAI ,  Satoshi FUKUOKA ,  Kenji SASAKI

IPC: G03G15/08

CPC classification number: G03G15/0808 ,  G03G15/0881

Abstract: A developing roll for use in an image-forming apparatus using electrophotography includes a cylindrical core made of metal; an annular elastic layer made of rubber and arranged around the core; and an annular surface layer arranged around the elastic layer. The surface layer includes a central portion and end portions. The central portion is located at the center of the developing roll in the longitudinal direction, the end portions are located at opposite end portions of the developing roll in the longitudinal direction. A coefficient of kinetic friction of the outer peripheral surface of each end portion of the surface layer is less than or equal to 0.1, and a ten-point average roughness Rz of the outer peripheral surface of each end portion of the surface layer is less than or equal to 1.8 μm.

公开(公告)号：US20230221661A1

公开(公告)日：2023-07-13

申请号：US17927443

申请日：2021-03-16

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Atsushi IKEDA ,  Satoshi FUKUOKA ,  Kenji SASAKI

IPC: G03G15/08

CPC classification number: G03G15/0808 ,  G03G15/0818

Abstract: A developing roll has a metal core, an elastic layer, and a surface layer, A value X is 65.6 N/mm3 or more and a value Y is 229 μm or more. The value X is P1/(D2×A) P2/(D2× A). P1 is the load to displace the roll by 100 μm when a metal probe is pressed against the roll. D1 is the displacement of the roll caused by the probe under the load P1. A is the area of the probe. P2 is the load to displace a material roll by 100 μm when the probe is pressed against the material roll with the core and the elastic layer and without the surface layer. D2 is the displacement of the material roll caused by the probe under the load P2. The value Y is the displacement of the developing roll when the probe pierces the surface layer.

公开(公告)号：US20220260937A1

公开(公告)日：2022-08-18

申请号：US17630562

申请日：2020-07-20

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Shogo SUZUKI ,  Satoshi FUKUOKA ,  Kenji SASAKI

IPC: G03G15/02

Abstract: A charging roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The average of heights of contours of convex portions on a surface of the surface layer relative to an average cylindrical surface obtained by averaging surface irregularities of the surface layer is equal to or greater than 0.8 micrometers and is equal to or less than 2.1 micrometers. The average of intervals between apexes of the convex portions on the surface of the surface layer is equal to or greater than 6.6 micrometers and is equal to or less than 11.5 micrometers.

公开(公告)号：US20220252997A1

公开(公告)日：2022-08-11

申请号：US17630551

申请日：2020-07-20

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Shogo SUZUKI ,  Satoshi FUKUOKA ,  Kenji SASAKI

IPC: G03G15/02

Abstract: A charging roll includes a core member, a rubber base material disposed around the core member, and a surface layer disposed around the rubber base material. The average of heights of contours of convex portions on a surface of the surface layer relative to an average cylindrical surface obtained by averaging surface irregularities of the surface layer is equal to or greater than 2.0 micrometers and is equal to or less than 8.4 micrometers. The average of intervals between apexes of the convex portions on the surface of the surface layer is equal to or greater than 6.7 micrometers and is equal to or less than 39.8 micrometers.

公开(公告)号：US20230244154A1

公开(公告)日：2023-08-03

申请号：US18010276

申请日：2021-04-02

Applicant: NOK CORPORATION

Inventor： Kosuke OURA ,  Atsushi IKEDA ,  Kenji SASAKI

IPC: G03G15/08

CPC classification number: G03G15/0818

Abstract: A developing roll used in an electrophotographic image forming apparatus has a metal core member, an elastic layer made of a rubber disposed around the core member, and a surface layer disposed around the elastic layer. The texture aspect ratio of the surface Str of the surface layer is equal to or greater than 0.55.