Varistor

Patent metadata

Field	Value
Publication number	US-10706994-B2
Application number	US-201916535434-A
Country	US
Kind code	B2
Filing date	Aug 8, 2019
Priority date	Oct 1, 2018
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A varistor includes a varistor body, a first terminal disposed on one side of the varistor body, a second terminal disposed on the other side of the varistor body, a first electrode disposed on an upper portion of the varistor body, electrically connected to the first terminal, and extending towards the other side of the varistor body, and a second electrode disposed on a lower portion of the varistor body, electrically connected to the second terminal, and extending towards the one side of the varistor body.

First claim

What is claimed is:

1. A varistor, comprising:
a varistor body;
a first terminal disposed on one side of the varistor body;
a second terminal disposed on another side of the varistor body;
a first electrode disposed on an upper portion of the varistor body, connected to the first terminal, and extending towards the another side of the varistor body; and
a second electrode disposed on a lower portion of the varistor body, connected to the second terminal, and extending towards the one side of the varistor body,
wherein the first terminal extends from the one side of the varistor body onto a portion of the first electrode on the upper portion of the varistor body,
the second terminal extends from the another side of the varistor body onto a portion of the second electrode on the lower portion of the varistor body, and
the varistor further comprises:
a first insulating layer disposed on another portion of the first electrode and extending to cover a portion of the upper portion of the varistor body exposed from the first electrode;
a second insulating layer disposed on another portion of the second electrode and extending to cover a portion of the lower portion of the varistor body exposed from the second electrode;
a third insulating layer disposed on the first insulating layer, and covering the another portion of the first electrode and the portion of the upper portion of the varistor body exposed from the first electrode; and
a fourth insulating layer disposed on the second insulating layer, and covering the another portion of the second electrode and the portion of the lower portion of the varistor body exposed from the second electrode.

2. The varistor of claim 1 ,
wherein the varistor body comprises ZnO, and
wherein an internal space of the varistor body is filled with a non-conductive material or a semiconductor material and does not include an internal electrode disposed in the internal space.

3. The varistor of claim 1 , wherein each of the first and second insulating layers is spaced apart from the one side and the another side of the varistor body.

4. The varistor of claim 3 ,
wherein the third insulating layer has a melting point lower than a melting point of the first insulating layer, and
the fourth insulating layer has a melting point lower than a melting point of the second insulating layer.

5. The varistor of claim 4 , wherein each of the third and fourth insulating layers comprises SiO 2 —B 2 O 3 —Bi 2 O 3 .

6. The varistor of claim 1 ,
wherein the third insulating layer is harder than the first insulating layer, and
the fourth insulating layer is harder than the second insulating layer.

7. The varistor of claim 6 , wherein each of the third and fourth insulating layers comprises a hardened epoxy resin.

8. The varistor of claim 1 ,
wherein the first and second insulating layers are in contact with the first terminal and the second terminal, respectively,
wherein a portion of the first insulating layer is disposed between the first electrode and the second terminal, and
wherein a portion of the second insulating layer is disposed between the second electrode and the first terminal.

9. The varistor of claim 1 ,
wherein the first insulating layer is bent at one end of the first electrode, and
wherein the second insulating layer is bent at one end of the second electrode.

10. The varistor of claim 1 ,
wherein a width of the first electrode is less than a width of the varistor body, and
wherein a width of the second electrode is less than the width of the varistor body.

11. The varistor of claim 10 ,
wherein the first insulating layer covers a side surface of the first electrode to prevent the first electrode from being exposed, and
the second insulating layer covers a side surface of the second electrode to prevent the second electrode from being exposed.

12. The varistor of claim 1 , wherein the first and second terminals are spaced apart from side surfaces of the varistor body in a width direction.

13. The varistor of claim 1 , wherein a length of the first electrode and a length of the second electrode are each greater than a thickness of the varistor body.

14. The varistor of claim 13 , wherein the first electrode and the second electrode overlap in a thickness direction of the varistor body.

15. The varistor of claim 1 , wherein a length of the first electrode is different from a length of the second electrode.

16. The varistor of claim 1 , wherein the first electrode and the second electrode do not overlap in a thickness direction of the varistor body.

17. The varistor of claim 1 , wherein each of the first and second insulating layers comprises one of SiO 2 , Al 2 O 3 , and an organic material.

Assignees

• Samsung Electro Mech

Inventors

• Kim Ic Seob
• Kim Jung Il
• Kim Yong Sung
• Oh Eun Ju
• Bae Su Rim
• Kim Hae In

Classifications

• H10W42/60 Primary

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

• H10D89/60

  Integrated devices comprising arrangements for electrical or thermal protection, e.g. protection circuits against electrostatic discharge [ESD] · CPC title

• H01G4/005

  Electrodes · CPC title

• H01G2/06

  specially adapted for mounting on a printed-circuit support · CPC title

• H01C13/02

  Structural combinations of resistors · CPC title