公开(公告)号：US20230245812A1

公开(公告)日：2023-08-03

申请号：US18161332

申请日：2023-01-30

Applicant: TDK CORPORATION

Inventor： Naoto TSUKAMOTO ,  Sena YOSHINO ,  Tomohiko AIDA ,  Shigeki YANAGIDA ,  Masashi GOTOH ,  Hirofumi SASAKI ,  Hitoshi SASAKI

IPC: H01F27/255 ,  H01F41/02 ,  H01F27/28 ,  H01F27/30

CPC classification number: H01F27/255 ,  H01F41/0246 ,  H01F27/2823 ,  H01F27/306

Abstract: A coil device 1 comprises a coil 10, a T-shaped core 20 including a columnar portion 21 around which the coil 10 is disposed and a flange 22 formed at a first end 21a of the columnar portion 21 in an axial direction thereof, and an exterior body 30 covering the coil 10 and the columnar portion 21 and made of an exterior material including magnetic particles and a resin. The core 20 is provided with a recess 40 including at least one of a first recess 41 or a second recess 42. The first recess 41 extends between the first end 21a and a second end 21b of the columnar portion 21 in the axial direction. The second recess 42 extends from an inner side towards an outer side of the flange 22.

公开(公告)号：US20210272736A1

公开(公告)日：2021-09-02

申请号：US17186425

申请日：2021-02-26

Applicant: TDK CORPORATION

Inventor： Syun ASHIZAWA ,  Takahiro BANZAI ,  Riku UMEKI ,  Satoshi SUGIMOTO ,  Hitoshi SASAKI

IPC: H01F27/24 ,  H01F27/29 ,  H01F41/04

Abstract: A coil device includes a main core and a sub core. The main core includes a middle leg for winding a coil body and an outer leg connected with the middle leg via a base portion. The sub core is disposed to face the base portion across the middle leg. A gap between the middle leg and the sub core is wider than that between the outer leg and the sub core.