Inductor component

Patent metadata

Field	Value
Publication number	US-2019115150-A1
Application number	US-201816155435-A
Country	US
Kind code	A1
Filing date	Oct 9, 2018
Priority date	Oct 17, 2017
Publication date	Apr 18, 2019
Grant date	—

Abstract

An inductor component comprising a spiral wiring wound on a plane; a first magnetic layer and a second magnetic layer located at positions sandwiching the spiral wiring from both sides in a normal direction relative to the plane on which the spiral wiring is wound; a vertical wiring extending from the spiral wiring in the normal direction to pass through the first magnetic layer; and an external terminal disposed on a surface of the first magnetic layer to connect an end surface of the vertical wiring. The first magnetic layer has magnetic permeability lower than that of the second magnetic layer.

First claim

What is claimed is:

1 . An inductor component comprising:
a spiral wiring wound on a plane; a first magnetic layer and a second magnetic layer located at positions sandwiching the spiral wiring from both sides in a normal direction relative to the plane on which the spiral wiring is wound, the first magnetic layer having magnetic permeability lower than that of the second magnetic layer; a vertical wiring extending from the spiral wiring in the normal direction to pass through the first magnetic layer; and an external terminal disposed on a surface of the first magnetic layer to connect an end surface of the vertical wiring.

2 . The inductor component according to claim 1 , wherein the first magnetic layer and the second magnetic layer comprise a metal magnetic substance filler and a binding resin.

3 . The inductor component according to claim 2 , wherein a cross section of the metal magnetic substance filler is exposed on an external principal surface of the first magnetic layer.

4 . The inductor component according to claim 2 , wherein an external principal surface of the second magnetic layer is covered with an organic resin.

5 . The inductor component according to claim 2 , wherein all of the external principal surface of the second magnetic layer is covered with the binding resin, and does not comprise a cross section of the metal magnetic substance filler exposed thereon.

6 . The inductor component according to claim 2 , wherein
the metal magnetic substance filler in the first magnetic layer is substantially spherical, and the metal magnetic substance filler in the second magnetic layer comprises a flattened metal magnetic substance filler.

7 . The inductor component according to claim 6 , wherein the flattened metal magnetic substance filler is disposed such that a major axis direction of the metal magnetic substance filler is substantially parallel to the plane on which the spiral wiring is wound.

8 . The inductor component according to claim 6 , wherein
the second magnetic layer is in a shape of a rectangle as viewed from above, and a longer side of the rectangle is substantially parallel to the major axis direction of the flattened metal magnetic substance filler.

9 . The inductor component according to claim 1 , wherein a second magnetic layer comprises at least one of a pressed powder of a metal magnetic substance, a metal magnetic substance plate and a metal magnetic substance foil.

10 . The inductor component according to claim 9 , wherein a total content of the pressed powder of the metal magnetic substance, the metal magnetic substance plate and the metal magnetic substance foil in the second magnetic layer is 90% by volume or more.

11 . The inductor component according to claim 6 , wherein a region where an existing amount of the magnetic substance filler is smaller relative to the first magnetic layer and the second magnetic layer exists between the first magnetic layer and the second magnetic layer.

12 . The inductor component according to claim 11 , wherein a maximum distance between the first magnetic layer and the second magnetic layer with the region sandwiched therebetween is from 0.5 μm to 30 μm.

13 . The inductor component according to claim 6 , wherein the inductor component comprises an organic resin layer directly sandwiched between the first magnetic layer and the second magnetic layer which contains no magnetic substance filler.

14 . The inductor component according to claim 13 , wherein a maximum thickness of the organic resin layer is from 0.5 μm to 30 μm.

15 . The inductor component according to claim 6 , wherein at least one of distances between a metal magnetic substance filler in the first magnetic layer and a metal magnetic substance filler in the second magnetic layer which is adjacent to said metal magnetic substance filler in the first magnetic layer is from 0.5 μm to 3 μm.

16 . The inductor component according to claim 11 , wherein the inductor component further comprises a void part directly sandwiched between the first magnetic layer and the second magnetic layer.

17 . The inductor component according to claim 16 , wherein a maximum thickness of the void part is preferably from 0.5 μm to 30 μm.

18 . The inductor component according to claim 11 , wherein the inductor component has effective magnetic permeability of from 40 to 200.

19 . The inductor component according to claim 1 , wherein the spiral wiring is covered with an insulating layer at least at its wound portion.

20 . The inductor component according to claim 1 , further comprising:
a plurality of the spiral wiring, and further comprising a via conductor connecting the spiral wirings to each other in series between the plurality of spiral wiring, wherein a same layer as the via conductor comprising the via conductor comprises only a conductor, an inorganic filler and an organic resin.

21 . The inductor component according to claim 1 , wherein the first magnetic layer has a thickness different from a thickness of the second magnetic layer.

Assignees

• Murata Manufacturing Co

Inventors

• Yoshioka Yoshimasa
• Kunimori Keisuke
• Hamada Akinori

Classifications

• H01F17/0013 Primary

  with stacked layers · CPC title

• H01F41/046 Primary

  structurally combined with ferromagnetic material · CPC title

• H01F27/292

  Surface mounted devices · CPC title

• H01F17/0033

  with the coil helically wound around a magnetic core · CPC title

• H01F2017/0066

  with a magnetic layer · CPC title