MULTILAYER COIL COMPONENT

• US 20200135375A1
• Filed: 10/29/2019
• Published: 04/30/2020
• Est. Priority Date: 10/30/2018
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: SATO, Hidekazu, SATO, Takahiro, KUDO, Hitoshi, ENDO, Takashi, NAGAI, Yusuke, SUZUKI, Tatsuro, KORIKAWA, Hiroko, KOMORITA, Kenji
• Granted Patent: US 11,810,704 B2
• Time in Patent Office: Days
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 17/04 with magnetic core
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/046 structurally combined with ferromagnetic material
• CPC Class Codes: H01F 5/003 Printed circuit coils

Abstract

A multilayer coil component includes an element body having a multilayer structure including a first element body portion formed of a ferrite element body material, and a second element body portion laminated on the first element body portion and formed of a ferrite element body material having a composition different from the ferrite element body material forming the first element body portion, a multilayer coil having an axis parallel to a lamination direction of the element body, and a stress alleviation portion provided in an inner region of the multilayer coil when viewed from the lamination direction. In the multilayer coil component, the stress alleviation portion is provided in the inner region of the multilayer coil in which a stress tends to be concentrated to alleviate the stress in the inner region of the multilayer coil, and thereby occurrence of cracking in the element body can be suppressed.

Claims

1. A multilayer coil component comprising:

an element body having a multilayer structure including;

a first element body portion formed of a first material; and

a second element body portion laminated on the first element body portion and formed of a second material having a composition different from that of the first material;

a multilayer coil having an axis parallel to a lamination direction of the element body; and

a stress alleviation portion provided in an inner region of the multilayer coil when viewed from the lamination direction.

2. The multilayer coil component according to claim 1, wherein the element body has a multilayer structure in which one of the first element body portions and the second element body portions sandwich the other thereof in the lamination direction.

3. The multilayer coil component according to claim 1, further comprising an intermediate layer formed of a mixed composition material including the first material and the second material between the first element body portion and the second element body portion.

4. The multilayer coil component according to claim 3, wherein the stress alleviation portion is in contact with the intermediate layer in the lamination direction.

5. The multilayer coil component according to claim 1, wherein the stress alleviation portion is a slit layer.

6. The multilayer coil component according to claim 1, wherein the stress alleviation portion is provided only in the inner region of the multilayer coil when viewed from the lamination direction.

7. The multilayer coil component according to claim 1, wherein the stress alleviation portion is provided on a coil axis of the multilayer coil.