Laminated inductor

Patent metadata

Field	Value
Publication number	US-9892843-B2
Application number	US-201615275924-A
Country	US
Kind code	B2
Filing date	Sep 26, 2016
Priority date	Nov 17, 2015
Publication date	Feb 13, 2018
Grant date	Feb 13, 2018

Abstract

One object is to provide a laminated inductor having a reduced thickness without reduction in the magnetic characteristic and the insulation quality. The laminated inductor includes a first magnetic layer, an internal conductor, second magnetic layers, third magnetic layers, and a pair of external electrodes. The first magnetic layer has a thickness of 4 to 19 μm, and includes three or more magnetic alloy particles arranged in the thickness direction and an oxide film binding the magnetic alloy particles together and containing Cr. The internal conductor includes a plurality of conductive patterned portions electrically connected to each other via the first magnetic layer. The second magnetic layers are composed of magnetic alloy particles and disposed around the conductive patterned portions. The third magnetic layers are composed of magnetic alloy particles and disposed so as to be opposed to each other in thickness direction.

First claim

What is claimed is:

1. A laminated inductor, comprising:
at least one first magnetic layer having a thickness of 4 to 19 μm along one axial direction, the at least one first magnetic layer including three or more magnetic alloy particles arranged in the one axial direction and a first oxide film, the first oxide film binding the magnetic alloy particles together and containing a first component including one or both of Cr and Al;
an internal conductor including a plurality of conductive patterned portions, the plurality of conductive patterned portions being disposed so as to be opposed to each other in the one axial direction across the at least one first magnetic layer, the plurality of conductive patterned portions electrically connected to each other with the at least one first magnetic layer placed therebetween, each of the plurality of conductive patterned portions constituting a part of a coil wound around the one axial direction;
a plurality of second magnetic layers composed of magnetic alloy particles, the plurality of second magnetic layers being disposed around the plurality of conductive patterned portions so as to be opposed to each other in the one axial direction across the at least one first magnetic layer;
a plurality of third magnetic layers composed of magnetic alloy particles, the plurality of third magnetic layers being disposed so as to be opposed to each other in the one axial direction across the at least one first magnetic layer, the plurality of second magnetic layers, and the internal conductor; and
a pair of external electrodes electrically connected to the internal conductor.

2. The laminated inductor of claim 1 , wherein
the at least one first magnetic layer further includes a second oxide film disposed between the magnetic alloy particles and the first oxide film, and
the second oxide film contains a second component including one or both of Si and Zr.

3. The laminated inductor of claim 2 , wherein the magnetic alloy particles constituting the at least one first magnetic layer, the plurality of second magnetic layers, and the plurality of third magnetic layers contain the first component, the second component, and Fe, with a ratio of the second component to the first component being larger than 1.

4. The laminated inductor of claim 2 , wherein the magnetic alloy particles constituting the plurality of second magnetic layers and the plurality of third magnetic layers contain 1.5 to 4 wt % of the first component and 5 to 8 wt % of the second component.

5. The laminated inductor of claim 1 , wherein the at least one first magnetic layer, the plurality of second magnetic layers, and the plurality of third magnetic layers include a resin material between the respective magnetic alloy particles.

6. The laminated inductor of claim 1 , wherein the at least one first magnetic layer, the plurality of second magnetic layers, and the plurality of third magnetic layers include a phosphorus element between the respective magnetic alloy particles.

Assignees

• Taiyo Yuden Kk

Inventors

• Arai Takayuki
• Kondou Ryuichi
• Yamaguchi Akiko
• Takeoka Shinsuke
• Oyama Kazuhiko
• Otake Kenji

Classifications

• H01F1/28 Primary

  dispersed or suspended in a bonding agent · CPC title

• H01F27/29

  Terminals; Tapping arrangements {for signal inductances} · CPC title

• H01F1/0306

  Metals or alloys, e.g. LAVES phase alloys of the MgCu2-type (H01F1/0304 takes precedence) · CPC title

• H01F27/255

  made from particles (H01F27/26 takes precedence) · CPC title

• H01F17/0013 Primary

  with stacked layers · CPC title