PROTECTION ELEMENT

• US 20150145637A1
• Filed: 07/02/2013
• Published: 05/28/2015
• Est. Priority Date: 07/12/2012
• Status: Abandoned Application

• Current Assignee: Dexerials Corporation
• Original Assignee: Dexerials Corporation
• Inventors: Mukai, Koichi, Furuuchi, Yuji, Nitta, Kyoko
• Application Number:
  US14/408,705
• Publication Number:
  US 20150145637A1
• Time in Patent Office: Days
• US Class Current: 337/184
• CPC Class Codes: H01H 2085/0275 Structural association with a printed circuit board
• CPC Class Codes: H01H 2085/466 with remote controlled forced fusing
• CPC Class Codes: H01H 37/761 with a fusible element forming part of the switched circuit H01H37/767 takes precedence
• CPC Class Codes: H01H 85/0047 Heating means
• CPC Class Codes: H01H 85/0052 Fusible element and series heating means or series heat dams
• CPC Class Codes: H01H 85/055 Fusible members

Abstract

A protection element wherein variations in fusing characteristics are improved by making the amount of a flux applied on a fusible conductor uniform. The protection element includes: an insulating substrate; a heating element laminated on the insulating substrate and covered with an insulating member; first and second electrodes, formed at both ends of the insulating substrate; an internal heating-element electrode laminated on the insulating member so as to be superposed above the heating element; and a fusible conductor whose ends are connected to the first and second electrodes, and center portion of which is connected to the internal heating-element electrode. To both ends of the heating element, there are connected heating element electrodes to connect a power supply to generate heat by passing electric current through the heating element. In the fusible conductor, a depression portion opened upward is formed at a position to be superposed above the heating element.

Claims

1. A protection element, comprising:

an insulating substrate;

a heating element laminated on the insulating substrate;

first and second electrodes;

an internal heating-element electrode electrically connected to the heating element and a current path between the first and the second electrodes;

a fusible conductor connected over from the internal heating-element electrode to the first and the second electrodes, fusing the current path between the first and second electrodes by heating, and having a depression portion in a position to be thermally coupled to the heating element; and

a flux applied to fill up the depression portion,

wherein the depression portion is formed and opened at a side for applying the flux.

2. The protection element according to claim 1, wherein the depression portion is a hole portion having a wall portion and a bottom portion.

3. The protection element according to claim 2, wherein the hole portion is formed to have any of a cylindrical shape, an inverted conical shape, an inverted truncated cone shape, a prism shape, an inverted pyramid shape, and an inverted truncated pyramid shape.

4. The protection element according to claim 1, wherein the depression portion is a through hole penetrating through the fusible conductor.

5. The protection element according to claim 4, wherein the through hole is formed to have any of a cylindrical shape, an inverted truncated cone shape, a prism shape, and an inverted truncated pyramid shape.

6. The protection element according to claim 1, the protection element further comprising a projecting wall portion formed along a circumference of the depression portion in an upper direction in which the depression portion is open.

7. The protection element according to claim 6, the protection element further comprising a flux-holding portion formed in a wall shape from a tip of the projecting wall portion toward a diameter direction and a center direction of the depression portion.

8. The protection element according to claim 7, wherein the flux-holding portion covers a whole of opening in an upper face of the depression portion and has at least one or more opening for the flux.

9. The protection element according to claim 2, wherein the hole portion further comprises a projecting member having an climb gradient from a circumference of the bottom portion of the hole portion toward a center portion of the bottom portion.

10. The protection element according to claim 1, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

11. The protection element according to claim 2, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

12. The protection element according to claim 3, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

13. The protection element according to claim 4, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

14. The protection element according to claim 5, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

15. The protection element according to claim 6, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

16. The protection element according to claim 7, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

17. The protection element according to claim 8, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.

18. The protection element according to claim 9, wherein the depression portion of the fusible conductor is formed in a position to be superposed above the heating element.