# US 12,217,902 B2 · Coil component

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- Number: US 12,217,902 B2
- Document ID: US12217902B2
- Status: Granted
- Kind: B2
- Application number: 17/545,629
- Filed: 2021-12-08
- Published: 2022-06-16
- Granted: 2025-02-04
- Earliest claimed: 2020-12-11
- Assignees: TDK Corporation
- Applicants: TDK Corporation
- Inventors: Masataro Saito; Hokuto Eda; Kohei Takahashi; Takamasa Iwasaki; Masazumi Arata
- Web page: https://patentgrep.com/patent/US12217902B2

## CPC

- H01F 27/292: {Surface mounted devices}
- H01F 17/04: with magnetic core
- H01F 27/324: {Insulation between coil and core, between different winding sections, around the coil; Other insulation structures}
- H01F 2017/048: {with encapsulating core, e.g. made of resin and magnetic powder}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

By overlapping the protruding portion of the first insulator and the protruding portion of the second insulator via the protruding portion of the substrate, the DC superposition characteristic of the coil component is improved.

## Claims

### Claim 1

A coil component comprising:
an element body including a magnetic material and having an upper surface and a lower surface parallel to each other;
a substrate disposed in the element body and extending parallel to the upper surface and the lower surface;
a first coil body disposed in the element body and formed on an upper surface of the substrate, the first coil body has a first planar coil and a first insulator, the first planar coil includes a first connection end, a first extraction end, and a first turn portion connecting the first connection end and the first extraction end, the first insulator covers the first planar coil in the same layer as the layer that the first planar coil is formed;
a second coil body disposed in the element body and formed on a lower surface of the substrate, the second coil body has a second planar coil and a second insulator, the second planar coil includes a second connection end connected to the first connection end of the first planar coil via the substrate, a second extraction end, and a second turn portion connecting the second connection end and the second extraction end, the second insulator covers the second planar coil in the same layer as the layer that the second planar coil is formed;
a pair of terminal electrodes provided on surfaces of the element body, the pair of terminal electrodes respectively connected to the first extraction end of the first planar coil and the second extraction end of the second planar coil;
wherein the substrate has an exposed substrate portion exposed from a first side surface connecting the upper surface and the lower surface of the element body,
wherein the first insulator has a first exposed insulator portion exposed from the first side surface of the element body and overlaps the exposed substrate portion on the first side surface, and
wherein the second insulator has a second exposed insulator portion exposed from the first side surface of the element body and overlaps the first exposed insulator portion on the first side surface via the exposed substrate portion.

### Claim 2 (depends on 1)

The coil component according to claim 1, wherein the first coil body has a seed pattern formed on the upper surface of the substrate and a plated portion plated and grown on the seed pattern, and
wherein the seed pattern of the first coil body is exposed from the first side surface of the element body between the exposed substrate portion and the first exposed insulator portion.

### Claim 3 (depends on 1)

The coil component according to claim 1, the second coil body has a seed pattern formed on the lower surface of the substrate and a plated portion plated and grown on the seed pattern, and
wherein the seed pattern of the second coil body is exposed from the first side surface of the element body between the exposed substrate portion and the second exposed insulator portion.

### Claim 4 (depends on 1)

The coil component according to claim 1, wherein the exposed substrate portion, the first exposed insulator portion, and the second exposed insulator portion are exposed at a position where a distance between the first side surface and the first coil body is shortest.

### Claim 5 (depends on 1)

The coil component according to claim 1, wherein the element body has an second side surface opposed to the first side surface, and the exposed substrate portion, the first exposed insulator portion, and the second exposed insulator portion are exposed on the second side surface at positions corresponding to positions where the exposed substrate portion, the first exposed insulator portion, and the second exposed insulator portion are exposed on the first side surface with respect to a direction that the first side surface and the second side surface are opposed.