Electronic component and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-11398342-B2
Application number	US-201916383919-A
Country	US
Kind code	B2
Filing date	Apr 15, 2019
Priority date	Dec 20, 2016
Publication date	Jul 26, 2022
Grant date	Jul 26, 2022

Abstract

An electronic component includes an element body and outer electrodes on the element body. The element body includes top and bottom opposed surfaces, and side surfaces connecting the top and bottom surfaces. An outer electrode includes a lower layer electrode on the top surface and the bottom surface, and an upper layer electrode overlying the lower layer electrode and extending from an upper side of the lower electrode onto the side surface. When viewed from a direction orthogonal to the top and bottom surfaces, an edge of the lower layer electrode is disposed at a position farther from the side surface at which the upper layer electrode is provided than a position of an edge of the upper layer electrode, and a radius of curvature of the edge of the lower electrode is larger than a radius of curvature of the edge of the upper layer electrode.

First claim

What is claimed is:

1. An electronic component comprising:
an element body and a plurality of outer electrodes provided on the element body; wherein
the element body includes a top surface, a bottom surface opposing the top surface, and a plurality of side surfaces connecting the top surface and the bottom surface;
at least one of the plurality of outer electrodes includes a lower layer electrode provided on at least one of the top surface and the bottom surface, and an upper layer electrode that overlies the lower layer electrode and extends from an upper side of the lower layer electrode onto the side surface;
when viewed from a direction orthogonal or substantially orthogonal to the top surface and the bottom surface, an edge of the lower layer electrode is disposed at a position farther from a side surface of the plurality of side surfaces at which the upper layer electrode is provided than a position of an edge of the upper layer electrode, and a radius of curvature of the edge of the lower layer electrode is larger than a radius of curvature of the edge of the upper layer electrode; and
a thermal shrinkage rate of the lower layer electrode is smaller than a thermal shrinkage rate of the upper layer electrode.

2. The electronic component according to claim 1 , wherein a width of the upper layer electrode is larger than a width of the lower layer electrode.

3. The electronic component according to claim 1 , wherein a shape of the edge of the lower layer electrode is a straight line.

4. An electronic component, comprising:
an element body and a plurality of outer electrodes provided on the element body; wherein
the element body includes a top surface, a bottom surface opposing the top surface, and a plurality of side surfaces connecting the top surface and the bottom surface;
at least one of the plurality of outer electrodes includes a lower layer electrode provided on at least one of the top surface and the bottom surface, and an upper layer electrode that overlies the lower layer electrode and extends from an upper side of the lower layer electrode onto the side surface;
when viewed from a direction orthogonal or substantially orthogonal to the top surface and the bottom surface, an edge of the lower layer electrode is disposed at a position farther from a side surface of the plurality of side surfaces at which the upper layer electrode is provided than a position of an edge of the upper layer electrode, and a radius of curvature of the edge of the lower layer electrode is larger than a radius of curvature of the edge of the upper layer electrode; and
in a cross section at a center or approximate center in a width direction of the lower layer electrode, a thickness of the lower layer electrode is increased toward the side surface.

5. The electronic component according to claim 1 , wherein the upper layer electrode and the lower layer electrode each include a contact surface having a convexo-concave shape, and the contact surfaces are in close contact with each other.

6. The electronic component according to claim 1 , wherein the plurality of outer electrodes are provided on a single side surface of the plurality of side surfaces.

7. The electronic component according to claim 1 , wherein a width of a portion of the upper layer electrode overlying the side surface increases toward the top surface and toward the bottom surface from a center or approximate center in a height direction of the overlying portion.

8. An electronic component, comprising:
an element body and a plurality of outer electrodes provided on the element body; wherein
the element body includes a top surface, a bottom surface opposing the top surface, and a plurality of side surfaces connecting the top surface and the bottom surface;
at least one of the plurality of outer electrodes includes a lower layer electrode provided on at least one of the top surface and the bottom surface, and an upper layer electrode that overlies the lower layer electrode and extends from an upper side of the lower layer electrode onto the side surface;
when viewed from a direction orthogonal or substantially orthogonal to the top surface and the bottom surface, an edge of the lower layer electrode is disposed at a position farther from a side surface of the plurality of side surfaces at which the upper layer electrode is provided than a position of an edge of the upper layer electrode, and a radius of curvature of the edge of the lower layer electrode is larger than a radius of curvature of the edge of the upper layer electrode; and
a shape of the edge of the lower layer electrode on a side of the side surface at which the upper layer electrode is provided is a convex curved line.

9. The electronic component according to claim 1 , wherein the lower layer electrode includes an oxide, and the upper layer electrode includes an oxide different from the oxide in the lower layer electrode.

10. The electronic component according to claim 9 , wherein the oxide of the lower layer electrode is Al 2 O 3 .

11. The electronic component according to claim 9 , wherein the oxide of the upper layer electrode is TiO 2 .

12. The electronic component according to claim 10 , wherein an amount of Al in the lower layer electrode is equal to or more than about 5 vol % and equal to or less than about 60 vol %.

13. The electronic component according to claim 11 , wherein an amount of Ti in the upper layer electrode is equal to or more than about 5 vol % and equal to or less than about 60 vol %.

14. The electronic component according to claim 4 , wherein a width of the upper layer electrode is larger than a width of the lower layer electrode.

15. The electronic component according to claim 4 , wherein a shape of the edge of the lower layer electrode is a straight line.

16. The electronic component according to claim 8 , wherein a width of the upper layer electrode is larger than a width of the lower layer electrode.

17. The electronic component according to claim 8 , wherein a shape of the edge of the lower layer electrode is a straight line.

18. The electronic component according to claim 4 , wherein a width of a portion of the upper layer electrode overlying the side surface increases toward the top surface and toward the bottom surface from a center or approximate center in a height direction of the overlying portion.

19. The electronic component according to claim 8 , wherein a width of a portion of the upper layer electrode overlying the side surface increases toward the top surface and toward the bottom surface from a center or approximate center in a height direction of the overlying portion.

Assignees

• Murata Manufacturing Co

Inventors

• Adachi Jun
• Hirakawa Naganori
• Asano Hiroyuki
• Nakamura Sumiyo

Classifications

• H01F27/29 Primary

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

• H01F27/00

  Details of transformers or inductances, in general · CPC title

• H01F41/10

  Connecting leads to windings (making electric connections in general H01R43/00) · CPC title

• H01F27/40

  Structural association with built-in electric component, e.g. fuse · CPC title

• H01F17/0013

  with stacked layers · CPC title