Protective element and protective circuit substrate using the same

Patent metadata

Field	Value
Publication number	US-9870886-B2
Application number	US-201615045686-A
Country	US
Kind code	B2
Filing date	Feb 17, 2016
Priority date	Feb 17, 2016
Publication date	Jan 16, 2018
Grant date	Jan 16, 2018

Abstract

A protective element includes: a rectangurarly shaped insulating substrate; a heat-generating element formed on the insulating substrate; first and second electrodes laminated on a surface of the insulating substrate; first and second connecting terminals provided on a back surface of the insulating substrate and being continuous with the first and second electrodes; a heat-generating element extracting electrode provided on a current path between the first and the second electrodes and electrically connected to the heat-generating element; and a meltable conductor laminated on a region extending from the heat-generating element extracting electrode to the first and second electrodes and to be melted by heat to interrupt the current path between the first electrode and the second electrodes; wherein at least one of the corner portions of the insulating substrate is chamfered.

First claim

The invention claimed is:

1. A protective element comprising:
a rectangurarly shaped insulating substrate;
a heat-generating element formed on the insulating substrate;
an insulating member laminated on the insulating substrate for so as to cover at least the heat-generating element;
a first and a second electrodes laminated on a surface of the insulating substrate;
a first connecting terminal provided on a back surface of the insulating substrate and being continuous with the first electrode and a second connecting terminal provided on the back surface and being continuous with the second electrode;
a heat-generating element extracting electrode provided on a current path between the first and the second electrodes and electrically connected to the heat-generating element; and
a meltable conductor laminated on a region extending from the heat-generating element extracting electrode to the first and second electrodes and to be melted by heat to interrupt the current path between the first electrode and the second electrode;
wherein at least one of the corner portions of the insulating substrate is chamfered.

2. The protective element according to claim 1 , wherein the corner portion is chamfered in a linear shape or in an arc shape.

3. The protective element according to claim 2 , wherein the insulating substrate is chamfered by punching out the corner portion.

4. The protective element according to claim 1 , wherein the insulating substrate is chamfered by punching out the corner portion.

5. The protective element according to claim 1 , wherein the insulating substrate is a ceramic substrate.

6. The protective element according to claim 1 , wherein all of the corner portions are chamfered.

7. The protective element according to claim 6 , wherein the corner portion is chamfered in a linear shape or in an arc shape.

8. The protective element according to claim 6 , wherein the insulating substrate is chamfered by punching out the corner portion.

9. A protective circuit substrate having a circuit substrate and a protective element mounted on the circuit substrate,
the protective element comprising:
a rectangurarly shaped insulating substrate;
a heat-generating element formed on the insulating substrate;
an insulating member laminated on the insulating substrate for so as to cover at least the heat-generating element;
a first and a second electrodes laminated on a surface of the insulating substrate;
a first connecting terminal provided on a back surface of the insulating substrate and being continuous with the first electrode and a second connecting terminal provided on the back surface and being continuous with the second electrode;
a heat-generating element extracting electrode provided on a current path between the first and the second electrodes and electrically connected to the heat-generating element; and
a meltable conductor laminated on a region extending from the heat-generating element extracting electrode to the first and second electrodes and to be melted by heat to interrupt the current path between the first electrode and the second electrode;
wherein at least one of the corner portions of the insulating substrate is chamfered.

Assignees

• Dexerials Corp

Inventors

• Furuuchi Yuji
• Fujihata Takashi
• Mukai Koichi

Classifications

• H01H61/02 Primary

  wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively · CPC title

• H01H37/34 Primary

  Means for transmitting heat thereto, e.g. capsule remote from contact member · CPC title

• H01H85/0241

  Structural association of a fuse and another component or apparatus (switches with built-in fuses H01H9/10, spark-gap arresters H01H85/44, transformers and inductances H01F27/402, capacitors H01G2/14, lamps H01K1/66, semiconductors H10W20/493 or H10W42/80) · CPC title

• H01H2085/0283

  Structural association with a semiconductor device · CPC title

• H01H37/761

  with a fusible element forming part of the switched circuit (H01H37/767 takes precedence) · CPC title