Thin type thermal fuse and manufacturing method thereof
First Claim
1. A thin type thermal fuse comprising:
- a resin base film;
a pair of belt-shaped lead conductors, tip portions of the pair of belt-shaped lead conductors being fixed on the resin base film;
a low melting-point fusible alloy piece coupled between the tip end portions of the belt-shaped lead conductors;
a flux applied on the low melting-point fusible alloy piece;
a resin cover film which is disposed on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed;
wherein a relation of (V/L)1/2 /d≦
1.8 is satisfied, where a distance between the tip portions of the belt-shaped lead conductors is set to be L, a volume of the low melting-point fusible alloy piece is set to be V and a distance between a front surface of the resin base film and an inner surface of the resin cover film is set to be d.
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Accused Products
Abstract
A thin type thermal fuse is structured by a resin base film, a pair of belt-shaped lead conductors, a low melting-point fusible alloy piece, flux and a resin cover film. Tip portions of the pair of belt-shaped lead conductors is fixed on the resin base film. The low melting-point fusible alloy piece is coupled between the tip end portions of the belt-shaped lead conductors. The flux applied on the low melting-point fusible alloy piece. The resin cover film which is disposed on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed. In the thin type thermal fuse, a relation of (V/L)1/2 /d≦1.8 is satisfied, where a distance between the tip portions of the belt-shaped lead conductors is set to be L, a volume of the low melting-point fusible alloy piece is set to be V and a distance between the front surface of the resin base film and an inner surface of the resin cover film is set to be d.
66 Citations
13 Claims
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1. A thin type thermal fuse comprising:
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a resin base film; a pair of belt-shaped lead conductors, tip portions of the pair of belt-shaped lead conductors being fixed on the resin base film; a low melting-point fusible alloy piece coupled between the tip end portions of the belt-shaped lead conductors; a flux applied on the low melting-point fusible alloy piece; a resin cover film which is disposed on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed; wherein a relation of (V/L)1/2 /d≦
1.8 is satisfied, where a distance between the tip portions of the belt-shaped lead conductors is set to be L, a volume of the low melting-point fusible alloy piece is set to be V and a distance between a front surface of the resin base film and an inner surface of the resin cover film is set to be d. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 13)
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9. A method of manufacturing a thin type thermal fuse comprising the steps of:
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fixing tip portions of a pair of belt-shaped lead conductors on a resin base film; coupling a low melting-point fusible alloy piece between the tip end portions of the belt-shaped lead conductors; applying a flux on the low melting-point fusible alloy piece; disposing a resin cover film on a one surface of the resin base film so that a space between said films at peripheries of both the resin cover film and the resin base film is sealed and a space between the resin cover film and the belt-shaped lead conductors is sealed; wherein a relation of (V/L)1/2 /d≦
1.8 is satisfied, where a distance between the tip portions of the belt-shaped lead conductors is set to be L, a volume of the low melting-point fusible alloy piece is set to be V and a distance between the front surface of the resin base film and an inner surface of the resin cover film is set to be d. - View Dependent Claims (10, 11, 12)
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Specification