Multilayer coil component

• US 10,643,781 B2
• Filed: 05/18/2017
• Issued: 05/05/2020
• Est. Priority Date: 05/30/2016
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Shimoyasu, Masashi, Sato, Shinichi, Nakagawa, Seiichi, Kawauchi, Mamoru, Kinouchi, Shigetoshi, Ito, Mitsuru, Shiga, Yuto
• Primary Examiner(s): Enad, Elvin G
• Assistant Examiner(s): Hossain, Kazi S
• Application Number:
  US15/598,606
• Publication Number:
  US 20170345553A1
• Time in Patent Office: 1,083 Days
• Field of Search: 336200, 336232, 336192
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2027/2809 on stacked layers
• CPC Class Codes: H01F 27/2804 Printed windings
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 27/324 Insulation between coil and core, between different winding sections, around the coil; Other insulation structures

Abstract

A multilayer coil component includes an element body, a coil disposed in the element body, and an external electrode disposed in the element body and electrically connected to the coil. The element body includes a principal surface that is a mounting surface, and an end surface positioned adjacent to the principal surface and extending in a direction crossing to the principal surface. The external electrode includes an underlying metal layer and a conductive resin layer. The underlying metal layer is formed on the principal surface and the end surface. The conductive resin layer is formed to cover the underlying metal layer. A thickness of the conductive resin layer at an end positioned above the principal surface of the underlying metal layer is equal to or greater than 50% of a maximum thickness of a portion positioned above the principal surface of the conductive resin layer.

Claims

1. A multilayer coil component, comprising:

an element body;

a coil disposed in the element body;

an external electrode disposed on the element body;

a connection conductor including one end connected to the coil and another end connected to the external electrode, the connection conductor being disposed in the element body,

wherein the element body includes

a principal surface that is a mounting surface; and

an end surface positioned adjacent to the principal surface and extending in a direction crossing to the principal surface, and

the external electrode includes

an underlying metal layer formed on the principal surface and the end surface; and

a conductive resin layer formed to cover the underlying metal layer,

the other end of the connection conductor is exposed at the end surface and connected to the underlying metal layer, and

when viewed from a direction orthogonal to the end surface, a position where the other end of the connection conductor is exposed at the end surface differs from a position where a thickness of a portion positioned above the end surface of the conductive resin layer is maximum, and

wherein a thickness of the conductive resin layer at an end positioned above the principal surface of the underlying metal layer is equal to or greater than 50% of a maximum thickness of a portion positioned above the principal surface of the conductive resin layer.

2. The multilayer coil component according to claim 1, wherein, when a surface including the end surface is set as a reference surface, a ratio of a length in the direction orthogonal to the end surface from the reference surface to the end of the underlying metal layer with respect to a length in the direction orthogonal to the end surface from the reference surface to a position where the thickness of the portion positioned above the principal surface of the conductive resin layer is maximum is 0.6 to 1.0.

3. The multilayer coil component according to claim 1, wherein an end positioned above the principal surface of the underlying metal layer is positioned on an outer side of the coil when viewed from the direction orthogonal to the principal surface.

4. The multilayer coil component according to claim 3, wherein the end of the underlying metal layer is positioned closer to the end surface than a position where a thickness of the portion positioned above the principal surface of the conductive resin layer is maximum, when viewed from the direction orthogonal to the principal surface.

5. A multilayer coil component, comprising:

an element body;

a coil disposed in the element body; and

an external electrode disposed on the element body and electrically connected to the coil,

wherein the element body includes

a principal surface that is a mounting surface; and

an end surface positioned adjacent to the principal surface and extending in a direction crossing to the principal surface,

the external electrode includes

an underlying metal layer formed on the principal surface and the end surface; and

a conductive resin layer formed to cover the underlying metal layer, and

a thickness of the conductive resin layer at an end positioned above the principal surface of the underlying metal layer is equal to or greater than 50% of a maximum thickness of a portion positioned above the principal surface of the conductive resin layer.

6. The multilayer coil component according to claim 5, wherein, when a surface including the end surface is set as a reference surface, a ratio of a length in a direction orthogonal to the end surface from the reference surface to the end of the underlying metal layer with respect to a length in the direction orthogonal to the end surface from the reference surface to a position where a thickness of the portion positioned above the principal surface of the conductive resin layer is maximum is 0.6 to 1.0.

7. The multilayer coil component according to claim 5, wherein the end of the underlying metal layer is positioned on an outer side of the coil when viewed from the direction orthogonal to the principal surface.

8. The multilayer coil component according to claim 5, further comprising:

a conductor disposed in the element body, the conductor including one end connected to the coil and another end exposed at the end surface and connected to the underlying metal layer,

wherein, when viewed from the direction orthogonal to the end surface, a position where the other end of the conductor is exposed at the end surface differs from a position where a thickness of the portion positioned above the end surface of the conductive resin layer is maximum.

9. The multilayer coil component according to claim 5, wherein the end of the underlying metal layer is positioned closer to the end surface than a position where a thickness of the portion positioned above the principal surface of the conductive resin layer is maximum, when viewed from the direction orthogonal to the principal surface.

10. A multilayer coil component, comprising:

an element body;

a coil disposed in the element body; and

an external electrode disposed on the element body and electrically connected to the coil,

wherein, the element body includes

a principal surface that is a mounting surface; and

an end surface positioned adjacent to the principal surface and extending in a direction crossing to the principal surface,

the external electrode includes

an underlying metal layer formed on the principal surface and the end surface; and

a conductive resin layer formed to cover the underlying metal layer, and

an end positioned above the principal surface of the underlying metal layer is positioned on an outer side of the coil when viewed from a direction orthogonal to the principal surface, and

wherein the end of the underlying metal layer is positioned closer to the end surface than a position where a thickness of the portion positioned above the principal surface of the conductive resin layer is maximum when viewed from the direction orthogonal to the principal surface.

11. The multilayer coil component according to claim 10, wherein a thickness of the conductive resin layer at the end of the underlying metal layer is equal to or greater than 50% of a maximum thickness of a portion positioned above the principal surface of the conductive resin layer.

12. The multilayer coil component according to claim 11, wherein, when a surface including the end surface is set as a reference surface, a ratio of a length in the direction orthogonal to the end surface from the reference surface to the end of the underlying metal layer with respect to a length in the direction orthogonal to the end surface from the reference surface to a position where a thickness of the portion positioned above the principal surface of the conductive resin layer is maximum is 0.6 to 1.0.

13. The multilayer coil component according to claim 10, further comprising:

a conductor disposed in the element body, the conductor including one end connected to the coil and another end exposed at the end surface and connected to the underlying metal layer,

wherein, when viewed from the direction orthogonal to the end surface, a position where the other end of the conductor is exposed at the end surface differs from a position where a thickness of the portion positioned above the end surface of the conductive resin layer is maximum.