# US 12,217,892 B2 · Coil component

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- Number: US 12,217,892 B2
- Document ID: US12217892B2
- Status: Granted
- Kind: B2
- Application number: 17/488,025
- Filed: 2021-09-28
- Published: 2022-04-07
- Granted: 2025-02-04
- Earliest claimed: 2020-10-07
- Assignees: Murata Manufacturing Co., Ltd.
- Applicants: Murata Manufacturing Co., Ltd.
- Inventors: Masayuki Oishi
- Web page: https://patentgrep.com/patent/US12217892B2

## CPC

- H01F 17/0013: {with stacked layers}
- H01F 27/2823: {Wires (H01F27/2866 takes precedence)}
- H01F 41/041: {Printed circuit coils (apparatus or processes for manufacturing printed circuits in general H05K3/00)}
- H01F 41/043: {by thick film techniques}
- H01F 41/046: {structurally combined with ferromagnetic material}
- H01F 2017/0066: {with a magnetic layer}
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

A coil component is capable of reducing specific resistance of a coil and reliably mitigating stress. A coil component includes a base body and a coil disposed in the base body. The base body includes a plurality of magnetic layers laminated in a first direction. The coil includes a plurality of coil wires laminated in the first direction. The coil wires extend along a plane orthogonal to the first direction. Each of the coil wires includes a first coil conductor layer and a second coil conductor layer laminated in the first direction. Specific resistance of the first coil conductor layer is smaller than specific resistance of the second coil conductor layer. Also, in a section orthogonal to an extending direction of each of the coil wires, the second coil conductor layer is adjacent to one side of the first coil conductor layer in the first direction, and a cavity portion is disposed in at least a part between the first coil conductor layer and one of the magnetic layers adjacent to another side of the first coil conductor layer in the first direction.

## Claims

### Claim 1

A coil component comprising:
a base body including a plurality of magnetic layers laminated in a first direction; and
a coil, disposed in the base body, and including a plurality of coil wires laminated in the first direction,
the coil wires extending along a plane orthogonal to the first direction,
each of the coil wires including a first coil conductor layer and a second coil conductor layer laminated in the first direction,
specific resistance of the first coil conductor layer being smaller than specific resistance of the second coil conductor layer, and
in a cross section orthogonal to an extending direction of each of the coil wires, the second coil conductor layer being adjacent to one side of the first coil conductor layer in the first direction, and a cavity portion being disposed between the first coil conductor layer and one of the magnetic layers adjacent to another side of the first coil conductor layer in the first direction.

### Claim 2 (depends on 1)

The coil component according to claim 1, wherein in the cross section, the second coil conductor layer is divided into a plurality of portions, and a cavity portion is present between the portions adjacent to each other.

### Claim 3 (depends on 1)

The coil component according to claim 1, wherein
in the cross section, a ratio of a sectional area of the second coil conductor layer to a sectional area of the first coil conductor layer is less than or equal to 100%.

### Claim 4 (depends on 1)

The coil component according to claim 1, wherein
in the cross section, a cavity portion is disposed between the second coil conductor layer and one of the magnetic layers adjacent to one side of the second coil conductor layer in the first direction.

### Claim 5 (depends on 4)

The coil component according to claim 4, wherein
in the cross section, a sectional area of the cavity portion between the first coil conductor layer and one of the magnetic layers adjacent to the first coil conductor layer is larger than a sectional area of the cavity portion between the second coil conductor layer and one of the magnetic layers adjacent to the second coil conductor layer.

### Claim 6 (depends on 1)

The coil component according to claim 1, wherein
in the cross section, a cavity portion is disposed between the first coil conductor layer and the second coil conductor layer.

### Claim 7 (depends on 1)

The coil component according to claim 1, wherein
a ratio of metal oxide contained in the first coil conductor layer is less than a ratio of metal oxide contained in the second coil conductor layer.

### Claim 8 (depends on 1)

The coil component according to claim 1, wherein
in the cross section, a thickness of the second coil conductor layer is smaller than a thickness of the first coil conductor layer.

### Claim 9 (depends on 2)

The coil component according to claim 2, wherein
in the cross section, a ratio of a sectional area of the second coil conductor layer to a sectional area of the first coil conductor layer is less than or equal to 100%.

### Claim 10 (depends on 3)

The coil component according to claim 3, wherein
in the cross section, a cavity portion is disposed between the second coil conductor layer and one of the magnetic layers adjacent to one side of the second coil conductor layer in the first direction.

### Claim 11 (depends on 2)

The coil component according to claim 2, wherein
in the cross section, a cavity portion is disposed between the first coil conductor layer and the second coil conductor layer.

### Claim 12 (depends on 3)

The coil component according to claim 3, wherein
in the cross section, a cavity portion is disposed between the first coil conductor layer and the second coil conductor layer.

### Claim 13 (depends on 4)

The coil component according to claim 4, wherein
in the cross section, a cavity portion is disposed between the first coil conductor layer and the second coil conductor layer.

### Claim 14 (depends on 5)

The coil component according to claim 5, wherein
in the cross section, a cavity portion is disposed between the first coil conductor layer and the second coil conductor layer.

### Claim 15 (depends on 2)

The coil component according to claim 2, wherein
a ratio of metal oxide contained in the first coil conductor layer is less than a ratio of metal oxide contained in the second coil conductor layer.

### Claim 16 (depends on 3)

The coil component according to claim 3, wherein
a ratio of metal oxide contained in the first coil conductor layer is less than a ratio of metal oxide contained in the second coil conductor layer.

### Claim 17 (depends on 4)

The coil component according to claim 4, wherein
a ratio of metal oxide contained in the first coil conductor layer is less than a ratio of metal oxide contained in the second coil conductor layer.

### Claim 18 (depends on 2)

The coil component according to claim 2, wherein
in the cross section, a thickness of the second coil conductor layer is smaller than a thickness of the first coil conductor layer.

### Claim 19 (depends on 3)

The coil component according to claim 3, wherein
in the cross section, a thickness of the second coil conductor layer is smaller than a thickness of the first coil conductor layer.

### Claim 20 (depends on 4)

The coil component according to claim 4, wherein
in the cross section, a thickness of the second coil conductor layer is smaller than a thickness of the first coil conductor layer.