Transient voltage protection device

Patent metadata

Field	Value
Publication number	US-12284752-B2
Application number	US-202318355525-A
Country	US
Kind code	B2
Filing date	Jul 20, 2023
Priority date	Aug 31, 2022
Publication date	Apr 22, 2025
Grant date	Apr 22, 2025

Abstract

A transient voltage protection device includes an element body formed with a cavity inside, a pair of external electrodes on the element body, and a pair of internal electrodes in the element body. The pair of internal electrodes oppose each other. Each internal electrode is connected to a corresponding external electrode of the pair of external electrodes. The element body includes a first inner surface and a second inner surface. The first and second inner surfaces define the cavity and oppose each other. The pair of internal electrodes are exposed to the cavity and disposed on the first inner surface. In a cross section along a direction in which the first inner surface and the second inner surface oppose each other, the first inner surface includes a contour different from a contour included in the second inner surface.

First claim

What is claimed is:

1. A transient voltage protection device comprising:
an element body formed with a cavity inside;
a pair of external electrodes disposed on the element body; and
a pair of internal electrodes disposed in the element body to oppose each other and each connected to a corresponding external electrode of the pair of external electrodes,
wherein the element body includes a first inner surface and a second inner surface that define the cavity and oppose each other,
the pair of internal electrodes are exposed to the cavity and disposed on the first inner surface, and
in a cross section along a direction in which the first inner surface and the second inner surface oppose each other, the first inner surface includes a contour different from a contour included in the second inner surface.

2. The transient voltage protection device according to claim 1 ,
wherein at least one internal electrode of the pair of internal electrodes includes a first surface and a second surface oppose each other in the direction in which the first inner surface and the second inner surface oppose each other,
the first surface is in contact with the first inner surface, and
the second surface is exposed to the cavity and is inclined relative to the direction in which the first inner surface and the second inner surface oppose each other.

3. The transient voltage protection device according to claim 2 ,
wherein each of the pair of internal electrodes includes the first surface and the second surface, and
the second surfaces oppose each other in a direction in which the pair of internal electrodes oppose each other.

4. The transient voltage protection device according to claim 2 ,
wherein each of the pair of internal electrodes includes a side edge exposed to the cavity and coupling the first surface and the second surface,
the side edges oppose each other in a direction in which the pair of internal electrodes oppose each other, and
a thickness of each of the pair of internal electrodes decreases toward the side edge.

5. The transient voltage protection device according to claim 1 ,
wherein the element body includes a discharge assistance portion in contact with the pair of internal electrodes, and
the discharge assistance portion includes the first inner surface.

6. The transient voltage protection device according to claim 5 ,
wherein the discharge assistance portion is curved in the cross section.

7. The transient voltage protection device according to claim 6 ,
wherein the pair of internal electrodes are curved along the discharge assistance portion in the cross section.

8. The transient voltage protection device according to claim 2 ,
wherein each of the pair of internal electrodes includes a side edge exposed to the cavity and coupling the first surface and the second surface,
the second surface includes a first portion and a second portion which are exposed to the cavity,
the first portion is located closer to the side edge than the second portion, and
a shortest distance between the first portion and the second inner surface is greater than a shortest distance between the second portion and the second inner surface.

9. The transient voltage protection device according to claim 2 ,
wherein the second surface includes a first region exposed to the cavity, and a second region not exposed to the cavity, and
the first region and the second region have different degrees of inclination relative to the direction in which the first inner surface and the second inner surface oppose each other.

10. The transient voltage protection device according to claim 1 ,
wherein the second inner surface includes a contour in a substantially linear shape in the cross section.

11. The transient voltage protection device according to claim 1 ,
wherein the second inner surface includes a contour protruding toward the first inner surface in the cross section.

Assignees

• Tdk Corp

Inventors

• Yoshida Naoyoshi
• Hayatsu Masato
• Takahashi Shunsuke
• Hiraba Sota

Classifications

• H10W44/601

  Capacitive arrangements (H10W44/20 takes precedence) · CPC title

• H10W42/60 Primary

  protecting against electrostatic charges or discharges, e.g. Faraday shields (integrated devices comprising arrangements for electrical protection H10D89/60) · CPC title

• H05K2201/0746

  Protection against transients, e.g. layout adapted for plugging of connector · CPC title

• H01C7/10

  voltage responsive, i.e. varistors · CPC title

• H05K1/0257 Primary

  Overvoltage protection · CPC title