Multilayer varistor

Patent metadata

Field	Value
Publication number	US-12224090-B2
Application number	US-202117796143-A
Country	US
Kind code	B2
Filing date	Dec 17, 2021
Priority date	Dec 24, 2020
Publication date	Feb 11, 2025
Grant date	Feb 11, 2025

Abstract

A multilayer varistor has a stack structure including a plurality of layers stacked in a third direction. The multilayer varistor includes a first internal electrode electrically connected to a first external electrode, a second internal electrode electrically connected to the second external electrode, and a third internal electrode electrically connected to the third external electrode. The first internal electrode is disposed between the second internal electrode and the third internal electrode in the third direction.

First claim

The invention claimed is:

1. A multilayer varistor comprising:
a sintered body;
a first internal electrode;
a second internal electrode;
a third internal electrode;
a first external electrode;
a second external electrode; and
a third external electrode,
the sintered body
having a first end surface and a second end surface facing each other in a first direction, a first side surface and a second side surface facing each other in a second direction, and a first principal surface and a second principal surface facing each other in a third direction,
having a stack structure including a plurality of layers stacked on each other in the third direction, and
being in a shape of a rectangular parallelepiped having long sides extending in the first direction,

the first internal electrode being disposed on a first stacking surface in an interior of the sintered body,
the second internal electrode being disposed on a second stacking surface in the interior of the sintered body, the second stacking surface being different from the first stacking surface,
the third internal electrode being disposed on a third stacking surface in the interior of the sintered body, the third stacking surface being different from the first stacking surface and the second stacking surface,
the first external electrode being electrically connected to the first internal electrode;
the second external electrode being electrically connected to the second internal electrode;
the third external electrode being electrically connected to the third internal electrode,
the first internal electrode including a first facing part and a first lead-out part, a width of the first lead-out part being less than a width of the first facing part,
the second internal electrode including a second facing part and a second lead-out part, a width of the second lead-out part being less than a width of the second facing part,
the third internal electrode including a third facing part and a third lead-out part, a width of the third lead-out part being less than a width of the third facing part,
the first internal electrode being disposed between the second internal electrode and the third internal electrode, and
in the first direction, a length of the first facing part being greater than a length of the second facing part and being greater than a length of the third facing part.

2. The multilayer varistor of claim 1 , wherein
in the first direction, a length of the first facing part is greater than or equal to 107.5% and less than or equal to 115% of a length of the second facing part or the third facing part.

3. The multilayer varistor of claim 1 , wherein
in the second direction, a length of the first facing part is greater than or equal to 107.5% and less than or equal to 115% of a length of the second facing part or the third facing part.

4. The multilayer varistor of claim 1 , wherein
in the first direction, the width of the first lead-out part is less than or equal to 90% of the width of the first facing part.

5. A multilayer varistor comprising:
a sintered body;
a first internal electrode;
a second internal electrode;
a third internal electrode;
a first external electrode;
a second external electrode; and
a third external electrode,
the sintered body:
having a first end surface and a second end surface facing each other in a first direction, a first side surface and a second side surface facing each other in a second direction, and a first principal surface and a second principal surface facing each other in a third direction,
having a stack structure including a plurality of layers stacked on each other in the third direction, and
being in a shape of a rectangular parallelepiped having long sides extending in the first direction,

the first internal electrode being disposed on a first stacking surface in an interior of the sintered body,
the second internal electrode being disposed on a second stacking surface in the interior of the sintered body, the second stacking surface being different from the first stacking surface,
the third internal electrode being disposed on a third stacking surface in the interior of the sintered body, the third stacking surface being different from the first stacking surface and the second stacking surface,
the first external electrode being electrically connected to the first internal electrode,
the second external electrode being electrically connected to the second internal electrode,
the third external electrode being electrically connected to the third internal electrode,
the first internal electrode including a first facing part and a first lead-out part, a width of the first lead-out part being less than a width of the first facing part,
the second internal electrode including a second facing part and a second lead-out part, a width of the second lead-out part being less than a width of the second facing part,
the third internal electrode including a third facing part and a third lead-out part, a width of the third lead-out part being less than a width of the third facing part,
the first internal electrode being disposed between the second internal electrode and the third internal electrode, and
in the second direction, a length of the first facing part being greater than a length of the second facing part and being greater than a length of the third facing part.

6. A multilayer varistor comprising:
a sintered body;
a first internal electrode;
a second internal electrode;
a third internal electrode;
a first external electrode;
a second external electrode; and
a third external electrode,
the sintered body:
having a first end surface and a second end surface facing each other in a first direction, a first side surface and a second side surface facing each other in a second direction, and a first principal surface and a second principal surface facing each other in a third direction,
having a stack structure including a plurality of layers stacked on each other in the third direction, and
being in a shape of a rectangular parallelepiped having long sides extending in the first direction,

the first internal electrode being disposed on a first stacking surface in an interior of the sintered body,
the second internal electrode being disposed on a second stacking surface in the interior of the sintered body, the second stacking surface being different from the first stacking surface,
the third internal electrode being disposed on a third stacking surface in the interior of the sintered body, the third stacking surface being different from the first stacking surface and the second stacking surface,
the first external electrode being electrically connected to the first internal electrode,
the second external electrode being electrically connected to the second internal electrode,
the third external electrode being electrically connected to the third internal electrode,
the first internal electrode including a first facing part and a first lead-out part, a width of the first lead-out part being less than a width of the first facing part,
the second internal electrode including a second facing part and a second lead-out part, a width of the second lead-out part being less than a width of the second facing part,
the third internal electrode including a third facing part and a third lead-out part, a width of the third lead-out part being less than a width of the third facing part,
the first internal electrode being disposed between the second internal electrode and the third internal electrode, and
the first facing part having an area greater than an area of the second facing part and greater than an area of the third facing part.

7. A multilayer varistor comprising:
a sintered body;
a first inter

Assignees

• Panasonic Ip Man Co Ltd

Inventors

• Takamura Masashi
• Watanabe Sayaka
• Fujii Takeshi
• Yanai Ken
• AKIYAMA Yuto

Classifications

• H01C1/148 Primary

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

• H01C7/18

  comprising a plurality of layers stacked between terminals · CPC title

• H01C7/105 Primary

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

• H01C7/10

  voltage responsive, i.e. varistors · CPC title