公开(公告)号：US20240390965A1

公开(公告)日：2024-11-28

申请号：US18796036

申请日：2024-08-06

Applicant: TOPPAN HOLDINGS INC.

Inventor： Shinichi SHIMAMURA ,  Akihiko KOBAYASHI ,  Hiroyasu AIZAWA

IPC: B21B38/04

Abstract: A metal foil for a spring member includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. In the first region, an absolute value of a difference value obtained by subtracting a standard deviation of a thickness in a width direction orthogonal to a rolling direction from a standard deviation of a thickness in the rolling direction is less than or equal to 0.15 μm. In the first region, an absolute value of a difference value obtained by subtracting a second maximum value from a first maximum value is less than or equal to 0.8 μm.

公开(公告)号：US20240392854A1

公开(公告)日：2024-11-28

申请号：US18796068

申请日：2024-08-06

Applicant: TOPPAN HOLDINGS INC.

Inventor： Shinichi SHIMAMURA ,  Akihiko Kobayashi ,  Hiroyasu Aizawa

IPC: F16F3/02 ,  B21B3/00 ,  C22F1/00

Abstract: A metal foil for a spring member includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. In the first region, an absolute value of a difference value obtained by subtracting variance of a thickness in a width direction orthogonal to a rolling direction from variance of a thickness in the rolling direction is less than or equal to 0.15 μm2. In the first region absolute value obtained by subtracting a second maximum value from a first maximum value is less than or equal to 0.8 μm2.

公开(公告)号：US20240390966A1

公开(公告)日：2024-11-28

申请号：US18796051

申请日：2024-08-06

Applicant: TOPPAN HOLDINGS INC.

Inventor： Shinichi SHIMAMURA ,  Akihiko KOBAYASHI ,  Hiroyasu AIZAWA

IPC: B21B38/04

Abstract: A metal foil for a spring member includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. In the first region, an absolute value of a difference value obtained by subtracting variance of a thickness in a width direction orthogonal to a rolling direction from variance of a thickness in the rolling direction is less than or equal to 0.15 μm2.

公开(公告)号：US20240390964A1

公开(公告)日：2024-11-28

申请号：US18796009

申请日：2024-08-06

Applicant: TOPPAN HOLDINGS INC.

Inventor： Shinichi SHIMAMURA ,  Akihiko Kobayashi ,  Hiroyasu Aizawa

IPC: B21B38/04 ,  B21B37/16

Abstract: A metal foil for a spring member includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. In the first region, an absolute value of a difference value obtained by subtracting a standard deviation of a thickness in a width direction orthogonal to a rolling direction from a standard deviation of a thickness in the rolling direction is less than or equal to 0.15 μm.

公开(公告)号：US20240392853A1

公开(公告)日：2024-11-28

申请号：US18795968

申请日：2024-08-06

Applicant: TOPPAN HOLDINGS INC.

Inventor： Shinichi SHIMAMURA ,  Akihiko KOBAYASHI ,  Hiroyasu AIZAWA

IPC: F16F3/02 ,  B21B1/40 ,  C23F1/02 ,  H04N23/50

Abstract: A metal foil includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. A difference value between a maximum value and a minimum value of a first thickness at each of points on a straight line in a rolling direction in the first region is a first difference value. A difference value between a maximum value and a minimum value of a second thickness at each of points on a straight line in a width direction orthogonal to the rolling direction is a second difference value. An absolute value of the difference value obtained by subtracting the second difference value from the first difference value is less than or equal to 0.8 μm.