US 2004/0070486 A1Published application

Thermal fuse

AssigneeMatsushita Electric Industrial Co., Ltd.

InventorsKenji Senda, Atsushi Kono

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Abstract

A thermal fuse having a quick melting property is provided. In the thermal fuse, metal layers 15, 16 connected to a fusible alloy 13 are provided at respective leading ends of a pair of metal terminals 11. The metal layers 15, 16 have larger wettability to a fusible alloy 13 than wettability of metal terminals 11 and first insulating film 12. The area (S) of the metal layers 15, 16, the length (L1) and the volume (V) of the fusible alloy 13, the distance (L2) between the leading ends of the metal terminals 11, and the distance (d) from the bottom face of the second insulating film 14 to the top face of the metal layers 15,16 satisfy the relation of Sd>V(L1+L2)/2L1.

Claims10

Dependent claims

A thermal fuse comprising:

a pair of metal terminals;
a first insulating film having respective leading ends of said metal terminals mounted thereto;
a fusible alloy provided between said respective leading ends of said metal terminals;
a second insulating film provided over said fusible alloy, and affixed to said first insulating film;
and
metal layers provided at said respective leading ends of said metal terminals and connected to said fusible alloy, said metal layers having larger wettability to said fusible alloy than said metal terminals and said first insulating film,
wherein an area (S) of said metal layers, a length (L1) and a volume (V) of said fusible alloy, a distance (L2) between said respective leading ends of said metal terminals, and a distance (d) from a bottom face of said second insulating film to a top face of said metal layers satisfy the relation:
Sd>(L1+L2)/2L1.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 10/468,357Filed 19 Aug 2003
Priority: JP 2001-04302220 Feb 2001
Published: 15 Apr 2004
Term ends: Not estimatedThe source records don’t support an estimate.

Classification3 codes

H01H 37/761
Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material:…
H01H 2037/768
Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material:…
H01H
Electric switches

Family

US 7,068,141 B2Related patent
US 2004/0070486 A1This patent

From the US filing history. Foreign family members aren’t listed.

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