Transient voltage protection device

Patent metadata

Field	Value
Publication number	US-12100536-B2
Application number	US-202217829569-A
Country	US
Kind code	B2
Filing date	Jun 1, 2022
Priority date	Jun 3, 2021
Publication date	Sep 24, 2024
Grant date	Sep 24, 2024

Abstract

A transient voltage protection device includes: an element body; a cavity portion provided in the element body; a pair of internal electrodes disposed in the element body; and a pair of external electrodes connected to the pair of internal electrodes. The pair of internal electrodes extend along a first direction and face each other in a second direction intersecting the first direction. The cavity portion includes a gap region located between the pair of internal electrodes in the second direction. A tip portion of at least one of the pair of internal electrodes is in contact with only the element body.

First claim

What is claimed is:

1. A transient voltage protection device comprising:
an element body;
a cavity portion provided in the element body;
a pair of internal electrodes disposed in the element body; and
a pair of external electrodes connected to the pair of internal electrodes,
wherein the pair of internal electrodes extend along a first direction and face each other in a second direction intersecting the first direction,
the cavity portion includes a gap region located between the pair of internal electrodes in the second direction, and
a tip portion on a distal end of at least one of the pair of internal electrodes is in contact with only the element body, and
the tip portion is not in contact with the gap region.

2. The transient voltage protection device according to claim 1 , wherein
a tip portion on a distal end of each of the pair of internal electrodes is in contact with only the element body.

3. The transient voltage protection device according to claim 1 , wherein
at least one of the pair of internal electrodes includes a portion facing a region other than the gap region in the cavity portion.

4. The transient voltage protection device according to claim 1 , further comprising a discharge auxiliary portion disposed in the element body,
wherein the discharge auxiliary portion is in contact with the pair of internal electrodes and connects the pair of internal electrodes to each other.

5. The transient voltage protection device according to claim 4 ,
wherein the discharge auxiliary portion faces the gap region.

6. The transient voltage protection device according to claim 4 ,
wherein each of the pair of internal electrodes includes:
a side edge facing the gap region; and
a first surface adjacent to the side edge and being in contact with the discharge auxiliary portion.

7. The transient voltage protection device according to claim 6 , wherein
each of the pair of internal electrodes further includes a second surface that is adjacent to the side edge and faces away from the first surface, and
the second surface faces the cavity portion.

8. The transient voltage protection device according to claim 1 , wherein
the pair of external electrodes is disposed on the element body so as to face each other in the first direction.

9. The transient voltage protection device according to claim 1 , wherein
the element body includes a plurality of insulator layers that is laminated.

10. The transient voltage protection device according to claim 1 , wherein
the pair of external electrodes is provided at both ends of the element body in the first direction.

11. The transient voltage protection device according to claim 1 , wherein
each of the pair of internal electrodes has rectangular shape whose longitudinal direction is the first direction in a plan view.

12. The transient voltage protection device according to claim 1 , wherein
the cavity portion is spaced apart from an outer surface of the element body.

13. The transient voltage protection device according to claim 4 , wherein
the discharge auxiliary portion is spaced apart from an outer surface of the element body.

14. The transient voltage protection device according to claim 4 , wherein
the discharge auxiliary portion includes an insulator and metal particles.

15. The transient voltage protection device according to claim 4 , wherein
the cavity portion is located inside an outer edge of the discharge auxiliary portion in a plan view.

Assignees

• Tdk Corp

Inventors

• Imai Yusuke
• Hayatsu Masato
• Yoshida Naoyoshi
• Yanata Takeshi

Classifications

• H01C1/148

  the terminals embracing or surrounding the resistive element (H01C1/142 takes precedence) · CPC title

• H01C7/123

  Arrangements for improving potential distribution · CPC title

• H01C7/1006 Primary

  Thick film varistors · CPC title

• H01T4/12

  hermetically sealed · CPC title

• H01C7/105

  Varistor cores (H01C7/12 takes precedence) · CPC title