公开(公告)号：US20230326668A1

公开(公告)日：2023-10-12

申请号：US18130509

申请日：2023-04-04

Applicant: TDK CORPORATION

Inventor： Toru TONOGAI ,  Arisa FURUYA

IPC: H01F27/30 ,  H01F27/28 ,  H01F27/29 ,  H01F27/24 ,  H01F27/32

CPC classification number: H01F27/306 ,  H01F27/2852 ,  H01F27/32 ,  H01F27/24 ,  H01F27/292

Abstract: A coil device 2 including a core 4, a coil 6 having a winding 60 embedded inside the core 4, and a lead-out 6b led out from the winding 60 to a bottom 4a of the core 4. The lead-out 6b includes a terminal 61 arranged at the bottom 4a of the core 4, the terminal 61 includes an embedded part 610 embedded inside the core 4 and an exposed part 611 exposed from the core 4. A metal layer 8 is formed on a surface of the exposed part 611.