公开(公告)号：US20220037068A1

公开(公告)日：2022-02-03

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

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：US20220375675A1

公开(公告)日：2022-11-24

申请号：US17740693

申请日：2022-05-10

Applicant: TDK CORPORATION

Inventor： Kentaro SAITO ,  Shota OTSUKA ,  Kyohei TONOYAMA ,  Tomonaga NISHIKAWA ,  Mitsuo NATORI ,  Yuuichi KAWAGUCHI ,  Junichi SHIMAMURA

IPC: H01F27/255 ,  H01F27/29

Abstract: A coil-embedded magnetic core capable of achieving improvements both in insulation and initial magnetic permeability, and coil devices thereof. The coil-embedded magnetic core embedding a coil made of a conductor, including magnetic powder and a resin, in which the coil-embedded magnetic core further includes a modifier.