Varistor and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10839994-B2
Application number	US-201916570047-A
Country	US
Kind code	B2
Filing date	Sep 13, 2019
Priority date	Nov 27, 2018
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A varistor includes a substrate; first and second electrodes disposed on an upper side and a lower side of the substrate, respectively; a core varistor body surrounded by the substrate and disposed between the first and second electrodes; first and second terminals having at least portions disposed on one side and the other side of the substrate, respectively, and electrically connected to the first and second electrodes, respectively; and a cover varistor body covering the core varistor body and disposed in a level higher than an upper surface of the substrate or disposed in a level lower than a lower surface of the substrate.

First claim

What is claimed is:

1. A varistor, comprising:
a substrate;
first and second electrodes disposed on an upper side and a lower side of the substrate, respectively;
a first core varistor body surrounded by the substrate and disposed between the first and second electrodes;
first and second terminals having at least portions disposed on one side and the other side of the substrate, respectively, and connected to the first and second electrodes, respectively;
a first cover varistor body covering the first core varistor body and disposed in a level higher than an upper surface of the substrate or disposed in a level lower than a lower surface of the substrate;
a second core varistor body surrounded by the substrate; and
a second cover varistor body covering the second core varistor body and disposed in a level higher than the upper surface of the substrate or disposed in a level lower than the lower surface of the substrate,
wherein the second cover varistor body covers the first cover varistor body, and
the first cover varistor body and the second cover varistor body are disposed on opposite sides of the substrate.

2. The varistor of claim 1 , wherein the first cover varistor body has an upper surface or a lower surface having an area greater than that of an upper surface or a lower surface of the first core varistor body.

3. The varistor of claim 2 , wherein the first cover varistor body is disposed on an upper side and a lower side of the first core varistor body and has an I-shaped form with the first core varistor body.

4. The varistor of claim 3 , wherein a width of each of the first and second electrodes is greater than a width of the first cover varistor body and less than a width of the substrate.

5. The varistor of claim 1 , wherein one of the first and second electrodes is configured to cover at least a portion of the first cover varistor body and at least a portion of the second cover varistor body together.

6. The varistor of claim 1 ,
wherein the first varistor body includes ZnO, and
the substrate is configured as an alumina substrate.

7. A varistor comprising:
a substrate;
first and second electrodes disposed on an upper side and a lower side of the substrate, respectively;
a first core varistor body surrounded by the substrate and disposed between the first and second electrodes;
first and second terminals having at least portions disposed on one side and the other side of the substrate, respectively, and connected to the first and second electrodes, respectively;
a first cover varistor body covering the first core varistor body and disposed in a level higher than an upper surface of the substrate or disposed in a level lower than a lower surface of the substrate;
a second core varistor body surrounded by the substrate;
a second cover varistor body covering the second core varistor body and disposed in a level higher than the upper surface of the substrate or disposed in a level lower than the lower surface of the substrate;
a third electrode having one portion disposed on an upper side of the second core varistor body or the second cover varistor body; and
a fourth electrode having one portion disposed on a lower side of the second core varistor body or the second cover varistor body,
wherein one portion of the first electrode is disposed on an upper side of the first core varistor body or the first cover varistor body and is spaced apart from the third electrode,
one portion of the second electrode is disposed on a lower side of the first core varistor body or the first cover varistor body and is spaced apart from the fourth electrode,
the third and fourth electrodes include third and fourth cover electrode portions disposed on an upper side or a lower side of the second core varistor body or the second cover varistor body, and third and fourth lead-out electrode portions configured to connect the third and fourth cover electrode portions to the first and second terminals, respectively, and
a width of each of the third and fourth cover electrode portions is greater than a width of each of the third and fourth lead-out electrode portions.

8. The varistor of claim 7 ,
wherein the third and fourth electrodes extend in a length direction, and
one of the first core varistor body and the second core varistor body is disposed adjacent to one side from a center of the substrate in the length direction, and the other one of the first core varistor body and the second core varistor body is disposed adjacent to the other side from the center of the substrate in the length direction.

9. The varistor of claim 7 , further comprising:
a first insulating layer covering the first and third electrodes; and
a second insulating layer covering the second and fourth electrodes,
wherein the third electrode is connected to the second terminal, and
the fourth electrode is connected to the first terminal.

10. A varistor, comprising:
a substrate;
a first core varistor body penetrating through the substrate and exposed from upper and lower surfaces of the substrate;
first and second terminals disposed on opposing sides of the substrate, respectively, and extending onto the upper and lower surfaces of the substrate;
a first electrode extending from an extending portion of the first terminal on the upper surface and covering a first end of the first core varistor exposed from the upper surface;
a second electrode extending from an extending portion of the second terminal on the lower surface and covering a second end of the first core varistor exposed from the lower surface;
a second core varistor body penetrating through the substrate and exposed from the upper and lower surfaces of the substrate;
a third electrode extending from the extending portion of the first terminal on the upper surface and covering a third end of the second core varistor exposed from the upper surface; and
a fourth electrode extending from the extending portion of the second terminal on the lower surface and covering a fourth end of the second core varistor exposed from the lower surface,
wherein the first and third electrodes are spaced apart from each other, and the second and fourth electrodes are spaced apart from each other.

11. The varistor of claim 10 , further comprising a cover varistor body covering one of the first and second ends of the core varistor body and having a width greater than that of the one of the first and second ends of the core varistor body,
wherein the cover varistor body is disposed between the one of the first and second ends of the core varistor body and one of the first and second external electrodes.

12. The varistor of claim 10 , wherein the substrate has a strength greater than that of the first core varistor body.

13. A varistor, comprising:
a substrate;
a first core varistor body penetrating through the substrate and exposed from upper and lower surfaces of the substrate;
first and second terminals disposed on opposing sides of the substrate, respectively, and extending onto the upper and lower surfaces of the substrate;
a first electrode extending from an extending portion of the first terminal on the upper surface and covering a first end of the first core varistor exposed from the upper surface;
a second electrode extending from an extending portion of the second terminal on the lower surface and covering a second end of the first core varistor exposed from the lower surface; and
a second core varistor body penetrating through the substrate and exposed from the upper and lower surfaces of the substrate,
wherein the first electrode covers a third end of the second core varistor exposed from the

Assignees

• Samsung Electro Mech

Inventors

• Kim Ic Seob
• Kim Jung Il
• Kim Yong Sung
• Kim Hae In

Classifications

• H01C1/16

  Resistor networks not otherwise provided for · CPC title

• H01C13/02

  Structural combinations of resistors · CPC title

• H01C7/12 Primary

  Overvoltage protection resistors; Arresters · CPC title

• H01C17/065

  by thick film techniques, e.g. serigraphy · CPC title

• H01C1/14

  Terminals or tapping points specially adapted for resistors; Arrangements of terminals or tapping points on resistors · CPC title