ESD protection device

Patent metadata

Field	Value
Publication number	US-9516728-B2
Application number	US-201414484357-A
Country	US
Kind code	B2
Filing date	Sep 12, 2014
Priority date	Mar 28, 2012
Publication date	Dec 6, 2016
Grant date	Dec 6, 2016

Abstract

An ESD protection device 1 includes an insulating member 10, first and second discharge electrodes 21 and 22, a first outer electrode 31, a second outer electrode 32, and inner conductors 41 and 42. The first and second discharge electrodes 21 and 22 are provided in the insulating member 10. The first outer electrode 31 is provided on an outer surface of the insulating member 10. The first outer electrode 31 is electrically connected to the first discharge electrode 21. The second outer electrode 32 is provided on an outer surface of the insulating member 10. The second outer electrode 32 is electrically connected to the second discharge electrode 22. The inner conductors 41 and 42 are provided in the insulating member 10. The inner conductors 41 and 42 are connected to the first outer electrode 31 or the second outer electrode 32.

First claim

The invention claimed is:

1. An ESD protection device comprising:
an insulating member;
first and second discharge electrodes provided in the insulating member;
a first outer electrode provided on an outer surface of the insulating member and electrically connected to the first discharge electrode;
a second outer electrode provided on an outer surface of the insulating member and electrically connected to the second discharge electrode; and
one or more inner conductors provided in the insulating member and connected to the first or second outer electrode.

2. The ESD protection device according to claim 1 , wherein the first discharge electrode and the second discharge electrode are provided so as to face each other, and
the inner conductors are provided so as to overlie, in a planar view, a portion where the first discharge electrode faces the second discharge electrode.

3. The ESD protection device according to claim 1 , wherein the insulating member includes a cavity, and
an end portion of the first discharge electrode and an end portion of the second discharge electrode are each positioned in the cavity.

4. The ESD protection device according to claim 3 , wherein the inner conductors are provided so as to overlie the cavity in a planar view.

5. The ESD protection device according to claim 1 , wherein the inner conductors include an inner conductor connected to the first discharge electrode and an inner conductor connected to the second discharge electrode are included, and
the inner conductors are arranged such that an end portion of the inner conductors connected to the first discharge electrode faces an end portion of the inner conductors connected to the second discharge electrode.

6. The ESD protection device according to claim 1 , wherein a plurality of the inner conductors are provided with a spacing therebetween along a thickness direction of the insulating member.

7. The ESD protection device according to claim 1 , wherein the insulating member includes first and second main surfaces, first and second side surfaces, and first and second end surfaces,
the first outer electrode includes a first portion provided on the first end surface and a second portion provided on at least one of the first and second main surfaces, and
the second outer electrode includes a third portion provided on the second end surface and a fourth portion provided on at least one of the first and second main surfaces.

8. The ESD protection device according to claim 7 , wherein the inner conductors include a first inner conductor connected to the first portion and a second inner conductor connected to the third portion.

9. The ESD protection device according to claim 3 , wherein at least one of the second and fourth portions is provided so as to overlie the cavity in a planar view.

10. The ESD protection device according to claim 1 , further comprising: a discharge supporting electrode arranged between an end portion of the first discharge electrode and an end portion of the second discharge electrode and decreasing a discharge start voltage between the first discharge electrode and the second discharge electrode.

11. The ESD protection device according to claim 1 , further comprising: a protection layer arranged between the insulating member and an end portion of at least one of the first and second discharge electrodes.

12. The ESD protection device according to claim 11 , wherein the protection layer includes at least one selected from among a group of alumina, mullite, zirconia, magnesia, and quartz.

13. The ESD protection device according to claim 2 , wherein the insulating member includes a cavity, and
an end portion of the first discharge electrode and an end portion of the second discharge electrode are each positioned in the cavity.

14. The ESD protection device according to claim 2 , wherein the inner conductors include an inner conductor connected to the first discharge electrode and an inner conductor connected to the second discharge electrode are included, and
the inner conductors are arranged such that an end portion of the inner conductors connected to the first discharge electrode faces an end portion of the inner conductors connected to the second discharge electrode.

15. The ESD protection device according to claim 3 , wherein the inner conductors include an inner conductor connected to the first discharge electrode and an inner conductor connected to the second discharge electrode are included, and
the inner conductors are arranged such that an end portion of the inner conductors connected to the first discharge electrode faces an end portion of the inner conductors connected to the second discharge electrode.

16. The ESD protection device according to claim 4 , wherein the inner conductors include an inner conductor connected to the first discharge electrode and an inner conductor connected to the second discharge electrode are included, and
the inner conductors are arranged such that an end portion of the inner conductors connected to the first discharge electrode faces an end portion of the inner conductors connected to the second discharge electrode.

17. The ESD protection device according to claim 2 , wherein a plurality of the inner conductors are provided with a spacing therebetween along a thickness direction of the insulating member.

18. The ESD protection device according to claim 3 , wherein a plurality of the inner conductors are provided with a spacing therebetween along a thickness direction of the insulating member.

19. The ESD protection device according to claim 4 , wherein a plurality of the inner conductors are provided with a spacing therebetween along a thickness direction of the insulating member.

20. The ESD protection device according to claim 5 , wherein a plurality of the inner conductors are provided with a spacing therebetween along a thickness direction of the insulating member.

Assignees

• Murata Manufacturing Co

Inventors

• Tsukizawa Takayuki
• Adachi Jun
• Yasunaka Katumi

Classifications

• H01T4/12 Primary

  hermetically sealed · CPC title

• H05K1/026

  Spark gaps · CPC title

• H05F3/04 Primary

  by means of spark gaps or other discharge devices (devices providing for corona discharge per se H01T19/00) · CPC title

• H01T1/22

  by the shape or the composition of the electrodes · CPC title