JPH05314888A - Manufacture of metallic foil fuse - Google Patents

Abstract

PURPOSE:To simplify the manufacturing process of metallic foil fuse and enable even metallic foil fuses of complex patterns to be readily manufactured with good mass productivity by adopting the technique of heat transfer. CONSTITUTION:Conductive metallic foil 13 is uniformly stuck to the surface of a long-size resin film 11 via an adhesive 12 and a thermosetting adhesive 14 is applied to the back side of the metallic foil 13 to form a heat transfer film 10. The heat transfer film 10 is disposed with its metallic foil surface in contact with or close to the upper surface of a insulating base 15 in the form of a film or plate. The pattern 17 of a fuse element is heat pressed from the back side of the film 10 using a transfer metal die 16 protrusively relieved and the resin film 11 and the adhesive 12 are melted by heat and the metallic foil 13 is transferred onto the insulator base 15 via the setting adhesive 14 into the pattern 17 of the metal die 16. Both end portions of the transferred metallic foil element are formed into terminals so as to manufacture a metallic foil fuse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a metal foil fuse, and more particularly to a method for manufacturing a high performance fuse which is small in size and operates at a low current.

[0002]

2. Description of the Related Art Conventionally, a fuse for electronic equipment using a metal foil that operates at a low current has a structure in which a metal is vapor-deposited on an organic film or a structure in which an extremely thin metal foil is sandwiched by an organic film. Etc. are known.

[0003]

In the former one of those described in the prior art, it takes a lot of man-hours to process the vapor-deposited film such as masking or etching, and also in the latter,
There is a problem that it takes a lot of time to process the metal foil or film.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to easily manufacture a metal foil fuse having a complicated pattern shape by a thermal transfer technique and to process the same. Simplification of
This will contribute to the improvement of productivity.

[0005]

To this end, the present invention provides a thermal transfer film comprising a metal foil provided on the surface of an insulating material such as a resin film, the metal foil surface of which is brought into contact with or close to an insulating substrate. After that, the thermal transfer film is thermocompression-bonded by a transfer mold in which the pattern of the fuse element is raised in a convex shape from the back surface side, preferably 120 to 160.
Characterized by a structure in which a metal foil is transferred to an insulating substrate in a pattern shape by thermocompression bonding at 0.2 ° C. for 0.2 to 2 seconds, and then both ends of the transferred metal foil element are subjected to terminal treatment to obtain a metal foil fuse. It is what

[0006]

EXAMPLE 1 An example will be described with reference to the drawings. As shown in FIG.
A conductive metal foil 13 is evenly adhered to the surface of 1 via an adhesive 12, and a thermosetting adhesive 14 is applied to the back surface of the metal foil 13 to form a thermal transfer film 10. ,
As shown in FIGS. 1 and 3, the thermal transfer film 10 is transferred onto a film or plate-shaped insulating substrate 15 through a heating and pressing means of a transfer die 16. More specifically, the transfer die 16 has a pattern 17 of a fuse element that is raised in a convex shape on the pressure-bonding surface thereof, and has a heating means and a temperature adjusting means thereof, which are not particularly shown, inside. ing. Then, the metal foil 1 in the film 10 for thermal transfer
The surface 3 is placed in contact with or in close proximity to the film or plate-shaped insulating substrate 15 and arranged horizontally or in parallel.
0 is thermocompression-bonded from the back surface side thereof onto the film or plate-shaped insulating substrate 15 by the transfer mold 16.

The thermocompression bonding by the transfer mold 16 is automatically and continuously carried out, preferably at a temperature of 120 to 160 ° C. for 0.2 to 2 seconds. Then, the resin film 1
1 and the adhesive 12 are melted by heat, and the metal foil 13 is placed on the insulating substrate 15 in the form of a film or a plate through the thermosetting adhesive 14.
The pattern 17 of the fuse element of the transfer mold 16 is transferred to, for example, an H shape. Next, the non-adhered thermal transfer film portion is peeled off to obtain a metal foil element 18 as a fuse element as shown in FIGS. 4 and 5, and then a metal foil element 18 is obtained as shown in FIG. Both ends (shaded portions) 19 and 20 of the foil element 18 are coated with a conductive paint such as silver paste and subjected to a terminal treatment for joining the external lead terminals, and both terminals 19 and 20 serving as electrodes are formed. Part 2 connected to
A metal foil fuse in which 1 has a fuse function is obtained. According to the metal foil fuse obtained in this embodiment, for example, face down bonding can be directly performed on the substrate.

[0008]

[Embodiment 2] The above embodiment is a case of a metal foil fuse in which the external lead terminals are connected on one side. However, in the case of a metal foil fuse in which the external lead terminals are connected to both sides, the case shown in FIGS. Produce by the steps shown.

Therefore, a further explanation will be given with reference to FIGS. 7 to 12 in which parts corresponding to those of FIGS. 1 to 6 are given the same reference numerals, and a film or plate-shaped insulating substrate 15 is coated with the same. The thermal transfer film 10 is brought into contact with or in close proximity via the released release agent 22 and is thermocompression bonded by the transfer mold 16 to transfer the fuse element pattern 17 to obtain the metal foil element 18 (see FIGS. 7 and 8). .. Then, the reinforcing insulating film 23 having the terminal holes 24 processed is thermocompression bonded to the upper surface of the metal foil element 18 via the thermosetting adhesive 25 (see FIG. 9).
Then, a conductive material such as a conductive resin is filled in the terminal hole 24 of the insulating film 23 to form the terminal portion 26 that is electrically connected to the one end 19 of the metal foil element 18 (see FIG. 10). .. Next, the film- or plate-shaped insulating substrate 15 is peeled off (see FIG. 11), and if necessary, the metal foil element 18 is removed.
The surface of the metal foil element 18 is cleaned to remove the release agent and the like, and then the facing surface of the metal foil element 18 is subjected to the steps shown in FIGS. 9 and 10.
A terminal portion 27 that is electrically connected to the other end portion 20 is formed (see FIG. 12).
See), get a metal foil fuse for double-sided connection.

[0010]

As described above, according to the present invention, since the metal foil fuse is manufactured by the thermal transfer technique, not only the fuse element pattern having a complicated shape can be easily formed, but also the thickness of the metal foil is increased. It is suitable for embedding in small parts such as tantalum chip capacitors because it is possible to design an arbitrary rating by changing the length and pattern width and it can be miniaturized. Can be mass-produced.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view showing a thermal transfer process in an example of a manufacturing method according to the present invention.

FIG. 2 is a cross-sectional explanatory view showing a thermal transfer film.

FIG. 3 is a perspective view illustrating a transfer mold.

FIG. 4 is a cross-sectional explanatory view showing a transferred state of the metal foil element.

FIG. 5 is an explanatory perspective view showing a transfer state of the metal foil element.

FIG. 6 is a perspective view illustrating a manufactured metal foil fuse.

FIG. 7 is a cross-sectional explanatory view showing a thermal transfer step in another example of the present invention.

FIG. 8 is a cross-sectional explanatory view showing a transferred state of the metal foil element.

FIG. 9 is a cross-sectional explanatory view showing a pressure-bonded state of the reinforcing insulating film when the terminal hole is processed.

FIG. 10 is a cross-sectional explanatory view showing a formation state of a terminal portion.

FIG. 11 is a cross-sectional explanatory view showing a peeled state of the insulating substrate.

FIG. 12 is a cross-sectional explanatory view of a metal foil fuse having connection terminal portions formed on both sides.

[Explanation of symbols]

 10 Thermal Transfer Film 11 Resin Film 12 Adhesive 13 Metal Foil 14 Thermosetting Adhesive 15 Film or Plate Insulating Substrate 16 Transfer Mold 17 Fuse Element Pattern 18 Metal Foil Element 19, 20 Both Ends of Metal Foil Element

Claims (2)

[Claims] 1. A thermal transfer film having a metal foil provided on the surface of a resin film is placed with the metal foil surface in contact with or in close proximity to an insulating substrate, and then the thermal transfer film is made convex from the back side thereof. A metal foil fuse is formed by transferring the metal foil to the pattern shape by heating and pressure bonding with a transfer mold in which the pattern of the fuse element is raised, and then performing terminal treatment on both ends of the transferred metal foil element. A method of manufacturing a metal foil fuse, characterized by the construction of obtaining 2. The method of manufacturing a metal foil fuse according to claim 1, wherein the transfer mold is heated to 120 to 160 ° C. and pressure-bonded for 0.2 to 2 seconds.