# US 10,312,013 B2 · Coil component

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- Number: US 10,312,013 B2
- Document ID: US10312013B2
- Status: Granted
- Kind: B2
- Application number: 15/426,445
- Filed: 2017-02-07
- Published: 2017-08-10
- Granted: 2019-06-04
- Earliest claimed: 2016-02-09
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Yoshihiro Kawasaki; Syun Ashizawa; Hirohumi Asou; Nobuo Takagi
- Web page: https://patentgrep.com/patent/US10312013B2

## CPC

- H01F 27/255: made from particles (H01F27/26 takes precedence)
- H01F 3/10: Composite arrangements of magnetic circuits
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 27/2828: {Construction of conductive connections, of leads}
- H01F 27/292: {Surface mounted devices}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## 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 soft magnetic metal powder having a flat shape is mixed in binder resin, the magnetic top plate being fixed to the first and second flange portions.

## Claims

### Claim 1

A coil component comprising:
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 soft magnetic metal powder having a flat shape is mixed in binder resin, the magnetic top plate being fixed to the first and second flange portions and including an outer peripheral region accounting for 10% of the entire area and a central region surrounded by the outer peripheral region;
wherein a ratio of the central region in which the soft magnetic metal powder is present as viewed in a thickness direction to an entire area of the central region is equal to or higher than 95%.

### Claim 2

A coil component comprising:
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 soft magnetic metal powder having a flat shape is mixed in binder resin, the magnetic top plate being fixed to the first and second flange portions,
wherein the magnetic top plate includes an outer peripheral region accounting for 10% of an entire area and a central region surrounded by the outer peripheral region, and
wherein a ratio of the central region in which the soft magnetic metal powder is present as viewed in a thickness direction to an entire area of the central region is equal to or higher than 95%.