Wire-wound coil element

Patent metadata

Field	Value
Publication number	US-11901106-B2
Application number	US-202217751097-A
Country	US
Kind code	B2
Filing date	May 23, 2022
Priority date	Feb 3, 2017
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

Abstract

A coil element according to one embodiment of the present invention has a rectangular parallelepiped shape and has a principal surface including long sides and short sides. The coil element includes a drum core, a winding wound around the drum core, a first external electrode, a second external, and a covering portion covering at least a part of the winding core. The drum core in the embodiment includes a first flange, a second flange, and a winding core connecting between the first flange and the second flange. The winding core extends along the short sides of the principal surface. In one embodiment, the coil element has a height less than 0.85 mm.

First claim

What is claimed is:

1. A coil element having a rectangular parallelepiped shape and having a principal surface including long sides and short sides, the coil element comprising:
a drum core including a first flange, a second flange, and a winding core connecting between the first flange and the second flange;
a first winding wound around the winding core;
a first external electrode electrically connected to one end of the first winding;
a second external electrode electrically connected to the other end of the first winding; and
a covering portion covering at least a part of the winding core,
wherein the winding core extends along the short sides of the principal surface;
wherein the coil element has a height less than 0.85 mm, the height being a dimension of the first flange of the coil element in a direction perpendicular to the principal surface;
wherein the coil element has a width, the width being a dimension of the coil element in the direction parallel to the short sides of the principal surface and parallel to a central axis of the winding core, and the central axis of the winding core extends along the short sides of the principal surface;
wherein the first flange is provided at one end of the winding core in the direction parallel to the short sides of the principal surface and parallel to the central axis of the winding core, and the second flange is provided at another end of the winding core in the direction parallel to the short sides of the principal surface and parallel to the central axis of the winding core; and
wherein the width in the direction parallel to the short sides of the principal surface is greater than the height.

2. The coil element of claim 1 , wherein both the first external electrode and the second external electrode are provided on the first flange.

3. The coil element of claim 2 , wherein the first external electrode is provided on one end of the first flange in a direction parallel to the long sides, and the second external electrode is provided on the other end of the first flange in the direction parallel to the long sides.

4. The coil element of claim 1 , wherein the first external electrode is provided on the first flange and the second external electrode is provided on the second flange.

5. The coil element of claim 4 , wherein
the first flange has a first end and a second end opposed to each other in the direction parallel to the long sides,
the second flange has a third end and a fourth end opposed to each other in the direction parallel to the long sides,
the first flange and the second flange are arranged such that the first end and the third end are opposed to each other and the second end and the fourth end are opposed to each other, and
the first external electrode is provided on the first end of the first flange, and the second external electrode is provided on the fourth end of the second flange.

6. The coil element of claim 4 , wherein
the first flange has a first end and a second end opposed to each other in the direction parallel to the long sides,
the second flange has a third end and a fourth end opposed to each other in the direction parallel to the long sides,
the first flange and the second flange are arranged such that the first end and the third end are opposed to each other and the second end and the fourth end are opposed to each other, and
the first external electrode is provided on the first end of the first flange, and the second external electrode is provided on the third end of the second flange.

7. The coil element of claim 1 , wherein the first external electrode extends from one end of the first flange to one end of the second flange, and the second external electrode extends from the other end of the first flange to the other end of the second flange.

8. The coil element of claim 1 , further comprising a covering portion that covers at least a part of the first winding.

9. The coil element of claim 8 , wherein the covering portion further covers at least a part of the drum core.

10. The coil element of claim 1 , wherein
a second winding wound around the winding core;
a third external electrode electrically connected to one end of the second winding; and
a fourth external electrode electrically connected to the other end of the second winding,
wherein each of the first external electrode and the third external electrode is provided on one end of the long sides of the principal surface, and each of the second external electrode and the fourth external electrode is provided on the other end of the long sides of the principal surface.

11. The coil element of claim 10 , further comprising a covering portion that covers at least a part of the first winding, wherein the covering portion covers at least a part of the second winding.

12. The coil element of claim 1 , wherein the distance between an outer periphery of the winding core and the first flange in a height direction of the coil element is equal to the distance between the outer periphery of the winding core and the first flange in a width direction of the coil element.

13. The coil element of claim 1 , wherein the drum core is made of ferrite.

14. The coil element of claim 1 , wherein the covering portion is made of a metal.

15. The coil element of claim 1 , wherein the coil element is configured for horizontal mounting relative to a mounting surface of circuit board; and wherein the central axis of the winding core extends along and parallel to the short sides of the principal surface and in a direction parallel to said mounting surface upon mounting of the coil element.

16. A coupling coil element having a rectangular parallelepiped shape and having a principal surface including long sides and short sides, the coupling coil element comprising:
a drum core including a first flange, a second flange, and a winding core connecting between the first flange and the second flange;
a first winding wound around the winding core;
a second winding wound around the winding core;
a first external electrode electrically connected to one end of the first winding; and
a second external electrode electrically connected to the other end of the first winding,
a third external electrode electrically connected to one end of the second winding;
a fourth external electrode electrically connected to the other end of the second winding; and
a covering portion covering at least a part of the winding core,
wherein the winding core extends along the short sides of the principal surface;
wherein the coil element has a height less than 0.85 mm, the height being a dimension of the first flange of the coil element in a direction perpendicular to the principal surface; and
wherein the coil element has a width, the width being a dimension of the coil element in the direction parallel to the short sides of the principal surface and parallel to a central axis of the winding core, and the central axis of the winding core extends along the short sides of the principal surface,
wherein the first flange is provided at one end of the winding core in the direction parallel to the short sides of the principal surface and parallel to the central axis of the winding core, and the second flange is provided at another end of the winding core in the direction parallel to the short sides of the principal surface and parallel to the central axis of the winding core; and
wherein the width in the direction parallel to the short sides of the principal surface is greater than the height.

17. The coupling coil element of claim 16 , wherein the drum core further i

Assignees

• Taiyo Yuden Kk

Inventors

• Aoki Hidenori
• Kashiwa Tomoo

Classifications

• H01F17/045 Primary

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

• B65H75/18

  Constructional details · CPC title

• H01F5/02

  wound on non-magnetic supports, e.g. formers · CPC title

• H01F17/0033

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

• H01F27/027

  specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards · CPC title