Coil component and terminal component used therein

Patent metadata

Field	Value
Publication number	US-9543071-B2
Application number	US-201514624442-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Feb 19, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Disclosed herein is a coil component that includes a base, a metal wire that is wound around the base and contains copper, and a terminal electrode that is provided on the base and contains nickel and tin. The terminal electrode includes a wire connection area to which an end portion of the metal wire is connected and which contains a CuNi alloy or a CuNiSn alloy, and a mounting area which is different from the wire connection area. The wire connection area includes a portion that contains a small amount of tin than the mounting area.

First claim

What is claimed is:

1. A coil component comprising:
a base;
a metal wire that is wound around the base and contains copper; and
a terminal electrode that is provided on the base and contains nickel and tin,
wherein the terminal electrode includes a wire connection area to which an end portion of the metal wire is connected and which contains a CuNi alloy or a CuNiSn alloy, and a mounting area which is different from the wire connection area, and
wherein the wire connection area includes a portion that contains a small amount of tin than the mounting area.

2. The coil component as claimed in claim 1 , wherein the mounting area has a tin layer that covers a nickel layer.

3. The coil component as claimed in claim 2 , wherein the wire connection area has a tin layer that covers a nickel layer, and a thickness of the tin layer in the wire connection area is less than a thickness of the tin layer in the mounting area.

4. The coil component as claimed in claim 3 , wherein the thickness of the tin layer in the wire connection area is less than 1.2 μm, and the thickness of the tin layer in the mounting area is greater than 1.2 μm.

5. The coil component as claimed in claim 1 , wherein the wire connection area is substantially free from tin.

6. The coil component as claimed in claim 1 , wherein the wire connection area covers a first surface of the base, and the mounting area covers a second surface that is substantially perpendicular to the first surface of the base.

7. The coil component as claimed in claim 1 ,
wherein the terminal electrode includes:
a base material;
a nickel layer that covers the base material; and
a tin layer that covers the nickel layer, and

wherein the terminal electrode is fixed to the base of the coil component.

Assignees

• Tdk Corp

Inventors

• Takagi Nobuo
• Tsuchida Setu
• Shimura Koji

Classifications

• H01F17/045

  with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core · CPC title

• H01F27/292 Primary

  Surface mounted devices · CPC title

• H01F27/30

  Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support · CPC title

• H01F27/2828

  Construction of conductive connections, of leads · CPC title

• H01F27/29

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