公开(公告)号：US20170229228A1

公开(公告)日：2017-08-10

申请号：US15426325

申请日：2017-02-07

Applicant: TDK Corporation

Inventor： Yoshihiro KAWASAKI ,  Syun Ashizawa ,  Hirohumi Asou ,  Nobuo Takagi

IPC: H01F27/255 ,  H01F27/29 ,  H01F27/28

CPC classification number: H01F27/255 ,  H01F3/10 ,  H01F17/045 ,  H01F27/2823 ,  H01F27/2828 ,  H01F27/29 ,  H01F27/292

Abstract: Disclosed herein is a coil component that includes a drum core having a winding core and first and second flange portions provided at opposite ends of the winding core; a wire wound around the winding core; terminal electrodes provided in the first and second flange portions, the terminal electrodes being connected to ends of the wire; and a magnetic top plate made of magnetic-powder containing resin in which magnetic powder is mixed in binder resin, the magnetic top plate being fixed to the first and second flange portions. The magnetic top plate has a lower surface facing the first and second flange portions and an upper surface located opposite to the lower surface. The density of the binder resin is higher in a surface layer part on a side of the upper surface than in a surface layer part on a side of the lower surface.