JP2754124B2 - Manufacturing method of metal foil fuse - Google Patents

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 incorporating the same into a small electronic component such as a surface-mounted fuse component or a tantalum capacitor. The present invention also relates to a method for manufacturing a high-performance fuse operating at a low current.

[0002]

2. Description of the Related Art Conventionally, a fuse for an electronic device using a metal foil operating at a low current has a structure in which a metal is deposited on an organic film or a structure in which an extremely thin metal foil is sandwiched between organic films. Etc. are known.

[0003]

Problems to be Solved by the Invention Among the techniques described in the prior art, in the former, man-hours are required for processing of a deposited film such as masking or etching, and in the latter, man-hours are required for processing of metal foil or film. There were problems such as this.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object to make use of an adhesive punching film and an insulating film with a slit for an electrode, and to provide a process. It is an object of the present invention to provide a method for manufacturing a metal foil fuse which can simplify the fusing and can freely set the fuse blowing performance and fuse size, and is suitable for mass production.

[0005]

In order to achieve this object, the present invention relates to a method of polymerizing a low-adhesion film capable of being peeled off on a metal foil for a fuse, and then forming two slits on the polymerized bonded body. Is provided by punching, and after the gap between the slits as a fuse portion, one of the single-sided adhesive insulating substrate, preferably a single-sided adhesive insulating substrate with a slit for an electrode is polymerized on the fuse metal foil side, and then After peeling off the low-adhesive film, the other side of the electrode-slit one-sided adhesive insulating substrate is polymerized and adhered to the peeled surface, and then each of the electrode slits is coated with a conductive resin. The electrode part surface and the two single-sided adhesive insulating substrate surfaces are combined, and then
The present invention is characterized in that a metal foil fuse is obtained by punching out the whole to a predetermined outer size and punching.

[0006]

Embodiments will be described with reference to the drawings.
Metal foil fuse obtained by the manufacturing method according to the present invention,
For example, there are two structures, depending on whether it is incorporated into an electronic component such as a tantalum electrolytic capacitor or the like, and when incorporated as a component into an electronic circuit or the like.

In the former structure, as shown in FIG. 1, two electrode portions 20, 20 are formed on the upper and lower sides, respectively, and as shown in FIG. This is a type suitable for preventing generation of an extra space between the objects 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 is a suitable type when it is mounted between the mounting objects 30 on the surface.

First, a method of manufacturing a metal foil fuse F1 having a structure in which two electrode portions 20 are formed vertically will be described with reference to the manufacturing steps shown in FIGS. 5 to 11. (1) First step (FIG. 5): a step of polymerizing and adhering a peelable low-adhesion film 11 to one surface of the metal foil 10 for a fuse; (2) Second step (FIG. 6): polymerizing bonding A step of forming slits 13 and 14 by punching at two locations to form a fuse portion 15 between the slits 13 and 14 in order to form a fuse portion on the body 12; (3) Third step (FIG. 7): fuse A step of polymerizing and attaching a single-sided adhesive polyimide film 16 punched out of an electrode slit 17 to the other surface of the metal foil 10 for use, (4) a fourth step (FIG. 8): a 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 peeled surface of the low-adhesive film 11, (6) a sixth step (FIG. 10): upper and lower electrode slits 1
9 and 17 (see FIG. 9), a step of forming the electrode portion 20 by coating the conductive resin surface together with the surfaces of the polyimide films 18 and 16 as both exteriors; (7) Seventh step (FIG. 11) A step of punching out the metal foil fuse F1 according to the external dimensions.

Next, a method of manufacturing a 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 FIGS.
Referring to the manufacturing steps shown in FIGS. 6, 8 and 12 to 15, this manufacturing step is as follows: (1) First step (FIG. 5): One surface of fuse metal foil 10 (2) Second step (FIG. 6): In order to form a fuse portion on the polymerized bonded body 12, two slits 13 and 14 are punched out by punching. A step of forming a fuse portion 15 between the slits 13 and 14; (3) a third step (FIG. 12): a step of superposing and bonding a single-sided adhesive polyimide film 21 to the other surface of the metal foil 10 for a fuse. (4) Fourth step (FIG. 8): a step of peeling the low-adhesion film 11; (5) Fifth step (FIG. 13): two electrode slits 23 on the peeling surface of the low-adhesion film 11; 24 single-sided adhesive polyimide film punched out (6) sixth step (FIG. 14): electrode slits 23, 2
4. Polyimide film 2 with conductive resin surface as exterior
(7) Seventh step (FIG. 15): punching out a metal foil fuse F2 in accordance with the external dimensions.

[0011]

According to the present invention, a metal foil fuse is manufactured by utilizing an adhesive punching film and an electrode slit insulating film.
By changing the size of the electrode slit, it is possible to freely set the fusing performance of the fuse and the overall size of the fuse as well as miniaturize it, and it is suitable for embedding in small electronic components such as tantalum capacitors. Yes, a high-performance fuse with a very small current rating, which is difficult to obtain with a line fuse, can be easily manufactured and mass-produced by punching a plurality of electrode slits simultaneously.

[Brief description of the 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 mounting 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 view showing a mounted state of a metal foil fuse according to another example.

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

[Explanation of symbols]

REFERENCE SIGNS LIST 10 metal foil for fuse 11 low-adhesive film 12 polymer-adhered body 13, 14 slit 15 fuse part 16, 18, 21, 22 single-sided adhesive polyimide film 17, 19, 23, 24 electrode slit 20 electrode part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H01H 69/02 H01H 58/00

Claims (3)

(57) [Claims] Claims: 1. A releasable low-adhesion film is polymer-adhered to a metal foil for a fuse, and then two slits are punched out on the polymer-adhered body to form a fuse portion between the slits. On the fuse metal foil side, one-sided adhesive insulating substrate is polymerized and adhered, and then, after peeling off the low-adhesive film, the other single-sided adhesive insulating substrate punched with an electrode slit on the peeled surface is removed. A polymer resin is applied to the slits for each electrode, and then the conductive resin is coated on each of the electrode slits so that the surface of the electrode portion and the both surfaces of the single-sided adhesive insulating substrate are aligned with each other. A method for producing a metal foil fuse, comprising: obtaining a metal foil fuse by heating. 2. The method for manufacturing a metal foil fuse according to claim 1, wherein a slit for an electrode is provided by punching in said one-sided adhesive insulating substrate. 3. The method for manufacturing a metal foil fuse according to claim 1, wherein two other electrode slits are punched in said other single-sided adhesive insulating substrate.