公开(公告)号：US11680307B2

公开(公告)日：2023-06-20

申请号：US17502323

申请日：2021-10-15

Applicant: TDK CORPORATION

Inventor： Kyohei Tonoyama ,  Ken Satoh ,  Kentaro Saito ,  Miyuki Asai ,  Hitoshi Ohkubo

IPC: C22C38/12 ,  H01F1/20 ,  C22C38/16 ,  C22C38/00 ,  H01F1/24 ,  C22C38/08 ,  B22F1/05 ,  B22F1/16 ,  B22F1/052 ,  B22F1/07

CPC classification number: C22C38/12 ,  B22F1/05 ,  B22F1/052 ,  B22F1/07 ,  B22F1/16 ,  C22C38/002 ,  C22C38/005 ,  C22C38/08 ,  C22C38/16 ,  H01F1/20 ,  H01F1/24 ,  B22F2301/355 ,  B22F2304/10

Abstract: A magnetic core includes a metal magnetic powder, which has a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder, the intermediate size powder, and the small size powder have an insulation coating. When A1 represents an average insulation coating thickness of the large size powder, A2 represents an average insulation coating thickness of the intermediate size powder, A3 represents an average insulation coating thickness of the small size powder, A3 is 30 nm or more and 100 nm or less, A3/A1≥1.3, and A3/A2≥1.0.

公开(公告)号：US11183320B2

公开(公告)日：2021-11-23

申请号：US16663514

申请日：2019-10-25

Applicant: TDK CORPORATION

Inventor： Kyohei Tonoyama ,  Ken Satoh ,  Kentaro Saito ,  Miyuki Asai ,  Hitoshi Ohkubo

IPC: H01F1/20 ,  B22F1/00 ,  B22F1/02 ,  H01F1/24 ,  C22C38/08 ,  C22C38/16 ,  C22C38/00 ,  C22C38/12

Abstract: A magnetic core includes a metal magnetic powder, which has a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder, the intermediate size powder, and the small size powder have an insulation coating. When A1 represents an average insulation coating thickness of the large size powder, A2 represents an average insulation coating thickness of the intermediate size powder, A3 represents an average insulation coating thickness of the small size powder, A3 is 30 nm or more and 100 nm or less, A3/A1≥1.3, and A3/A2≥1.0.

公开(公告)号：US11657949B2

公开(公告)日：2023-05-23

申请号：US16663464

申请日：2019-10-25

Applicant: TDK CORPORATION

Inventor： Kyohei Tonoyama ,  Ken Satoh ,  Kentaro Saito ,  Miyuki Asai ,  Hitoshi Ohkubo

IPC: H01F27/28 ,  H01F27/255 ,  H01F17/00 ,  H01F17/04 ,  H01F27/29 ,  H01F27/32

CPC classification number: H01F27/255 ,  H01F17/0013 ,  H01F17/04 ,  H01F27/2804 ,  H01F27/292 ,  H01F27/324 ,  H01F2017/048 ,  H01F2027/2809

Abstract: A magnetic core and a coil component with excellent permeability, core loss, DC superimposition property, and withstand voltage. A magnetic core has a metal magnetic powder containing resin including a metal magnetic powder. The metal magnetic powder includes a large size powder, an intermediate size powder, and a small size powder. A particle size of the large size powder is 10 μm or more and 60 μm or less. A particle size of the intermediate size powder is 2.0 μm or more and less than 10 μm. A particle size of the small size powder is 0.1 μm or more and less than 2.0 μm. The large size powder includes a nano crystal. A ratio of the large size powder existing with respect to the metal magnetic powder is 39% or more and 91% or less in terms of an area ratio in a cross section of the magnetic core.