JPH06103880A - Manufacturing method of metal foil fuse - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the process, to freely set the fusing performance and size of the fuse, and to manufacture a metal foil fuse suitable for mass production. [Structure] A peelable low-adhesive film is adhered to the fuse metal foil 10, and two slits are punched out to form a fuse portion between the slits, and a single-sided adhesive insulation is provided on the fuse metal foil side. The substrate 16 is adhered, then the low-adhesion film is peeled off, and the other one-sided adhesive insulating substrate 18 having the electrode slit punched out is adhered to the peeled surface, and then a conductive resin is applied to the electrode slit. After coating and forming the electrode portion 20, the whole is adjusted to a predetermined size and punched to obtain a metal 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 metal foil fuse suitable for being incorporated in a small electronic component such as a surface mount fuse component or a tantalum capacitor, and having a low profile and small size. The present invention also relates to a method of manufacturing a high performance fuse that operates at 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 ultrathin metal foil is sandwiched by an organic film. Etc. are known.

[0003]

In the former of those described in the prior art, it takes a lot of man-hours to process a vapor deposition film such as masking or etching, and in the latter, too, the man-hours to process a metal foil or film are large. There were problems such as this.

The present invention has been made in view of the above problems of the prior art. The purpose of the present invention is to make good use of an adhesive punching film and an electrode slitting insulating film, It is an object of the present invention to provide a method for manufacturing a metal foil fuse, which is capable of freely setting the fusing performance of the fuse and the fuse size, and which is suitable for mass production.

[0005]

In order to achieve this object, the present invention provides a metal foil for a fuse with a peelable low-adhesive film which is polymer-pasted, and then two slits are formed in the polymer-bonded body. Is provided by punching, after forming a fuse portion between the slits, one of the one-sided adhesive insulating substrate on the metal foil side for the fuse, preferably one-sided adhesive insulating substrate with slits for electrodes is polymerized and adhered, and then After peeling off the low-adhesion film, the other one-sided adhesive insulating substrate with slits for electrodes is polymer-bonded to the peeled surface, and then a conductive resin is coated on each of the slits for electrodes. Align the surface of the electrode part and the surfaces of the single-sided adhesive insulating substrates of both of
The present invention is characterized in that a metal foil fuse is obtained by punching the entire body in accordance with a predetermined external dimension.

[0006]

EXAMPLES Examples will be described with reference to the drawings.
The metal foil fuse obtained by the manufacturing method according to the present invention,
For example, there are two structures, one for incorporating into an electronic component such as a tantalum electrolytic capacitor and the other for incorporating into an electronic circuit or the like as a component.

In the former structure, as shown in FIG. 1, two electrode portions 20, 20 are respectively formed on the upper and lower sides, and this structure has a structure as shown in FIG. This type is suitable for preventing an extra space from being generated between the objects 30 and 30.

On the other hand, in the latter structure, as shown in FIG. 3, two electrode portions 20 are formed on the same surface, and this structure is the same as shown in FIG. This type is suitable for mounting between the mounted objects 30, 30 on the surface.

First, a method of manufacturing the metal foil fuse F1 having a structure in which two electrode portions 20 are formed above and below will be described with reference to the manufacturing steps shown in FIGS. 5 to 11. , (1) First step (FIG. 5): Step of polymerizing and sticking a peelable low-adhesive film 11 on one surface of the fuse metal foil 10, (2) Second step (FIG. 6): Polymerizing and sticking A step of forming slits 13 and 14 by punching at two places to form a fuse portion on the body 12, and forming a fuse portion 15 between the slits 13 and 14. (3) Third step (FIG. 7): fuse Step of polymerizing and adhering the single-sided adhesive polyimide film 16 punched with the electrode slit 17 to the other surface of the metal foil 10 for use in manufacturing, (4) Fourth step (FIG. 8): Step of peeling the low-adhesive film 11 (5) Fifth step (FIG. 9): A step of polymerizing and adhering a single-sided adhesive polyimide film 18 obtained by punching out the other electrode slit 19 on the peeling surface of the low-adhesive film 11, (6) Sixth step (FIG. 10): upper and lower electrode slits 1
9 and 17 (see FIG. 9), the conductive resin surface is coated together with the surfaces of the polyimide films 18 and 16 serving as both exteriors to form the electrode portion 20, (7) Seventh step (FIG. 11) : It consists of punching out the metal foil fuse F1 according to the external dimensions.

Next, a method of manufacturing the metal foil fuse F2 having a structure in which two electrode portions 20 are formed on the same surface will be described with reference to FIG.
The manufacturing steps will be described with reference to the manufacturing steps shown in FIGS. 6, 8 and 12 to 15. (1) First step (FIG. 5): One surface of the fuse metal foil 10 A step of polymerizing and adhering a low-adhesive film 11 that can be peeled onto the surface, (2) second step (FIG. 6): in order to form a fuse part on the polymerized adhesive body 12, two slits 13 and 14 are punched out. Step of forming and forming fuse portion 15 between slits 13 and 14, (3) Third step (FIG. 12): Step of polymerizing and sticking single-sided adhesive polyimide film 21 on the other surface of fuse metal foil 10. (4) Fourth step (FIG. 8): Step of peeling the low-adhesive film 11, (5) Fifth step (FIG. 13): Two electrode slits 23 on the peeled surface of the low-adhesive film 11, 24 side punched single-sided adhesive polyimide film (6) Sixth step (FIG. 14): electrode slits 23, 2
4. Polyimide film 2 with conductive resin surface as exterior
The step of forming the electrode portions 20 and 20 by coating with the second surface, and (7) seventh step (FIG. 15): punching out the metal foil fuse F2 according to the external dimensions.

[0011]

According to the present invention, however, a metal foil fuse is manufactured by making good use of an adhesive punching film and an insulating film with slits for electrodes.
By changing the size of the electrode slit, not only can the fusing performance of the fuse and the overall size of the fuse be set freely, but it can also be miniaturized, making it suitable for embedding in small electronic components such as tantalum capacitors. Therefore, a high-performance fuse with a minute current rating, which is difficult to obtain with a wire fuse, can be easily manufactured in mass production by punching a plurality of electrode slit portions at the same time.

[Brief description of drawings]

FIG. 1 is a perspective view of an example of a metal foil fuse obtained by a manufacturing method according to the present invention.

FIG. 2 is an explanatory diagram showing a mounted state of a metal foil fuse according to an example.

FIG. 3 is a perspective view of another example of the metal foil fuse obtained by the manufacturing method according to the present invention.

FIG. 4 is an explanatory diagram showing a mounted state of a metal foil fuse according to another example.

5 to 15 are perspective views showing a manufacturing process of the metal foil fuse of FIGS. 1 and 3.

[Explanation of symbols]

10 Fuse metal foil 11 Low-adhesion film 12 Polymerized adhesive body 13, 14 Slit 15 Fuse part 16, 18, 21, 22 Single-sided adhesive polymer film 17, 19, 23, 24 Electrode slit 20 Electrode part

Claims (3)

[Claims] 1. A peelable low-adhesive film is polymer-bonded to a fuse metal foil, and then two slits are punched in the polymer-bonded body to form a fuse portion between the slits. One of the single-sided adhesive insulating substrates is polymerized and adhered to the fuse metal foil side, then the low-adhesive film is peeled off, and the other one-sided adhesive insulating substrate is punched with an electrode slit on the peeled surface. Polymerization and adhesion, then coat the electrode slits formed by coating a conductive resin with the surfaces of the electrode parts formed on both sides of the single-sided adhesive insulating substrate, and then punch out by matching the whole with the prescribed external dimensions. A method of manufacturing a metal foil fuse, characterized in that a metal foil fuse is obtained. 2. The method for manufacturing a metal foil fuse according to claim 1, wherein the one-sided adhesive insulating substrate is provided with punched electrode slits. 3. The method for manufacturing a metal foil fuse according to claim 1, wherein the other one-sided adhesive insulating substrate is provided with two electrode slits by punching.