KR102327075B1 - Flax sheet, flax, fuse element, fuse device, protective element, short-circuit element, and switching element - Google Patents

Abstract

The improvement of ratings, such as a fuse element, and quick-melting property are made compatible, and a flex is hold|maintained appropriately on a soluble conductor. The fuse element 1 has a soluble conductor 6 and a flex sheet 5 in which an insulator is impregnated with a flex 7 , and a flex sheet 5 on the soluble conductor 6 and/or under the soluble conductor 6 . ) is mounted, and the soluble conductor 6 is fused by the overcurrent flowing through the soluble conductor 6 . Alternatively, the fuse element 1 has a fusible conductor 6 and a fluid or semi-fluid insulator piece containing a flax 9 containing a fusible conductor 6 and an insulator piece holding the liquid on the fusible conductor 6 and/or the fusible conductor 6 ) is applied under

Description

FLAX SHEET, FLAX, FUSE ELEMENT, FUSE DEVICE, PROTECTIVE ELEMENT, SHORT-CIRCUIT ELEMENT, AND SWITCHING ELEMENT}

The present invention relates to a fuse element that is mounted on a current path and cuts off the current path by self-heating when a current exceeding the rating flows, or by melting by heat generation of a heating element. , and a fuse element, a protection element, a short circuit element, a switching element using the same, and a flex sheet and flex used therefor.

This application claims priority on the basis of Japanese Patent Application No. 2014-229359 for which it applied in Japan on November 11, 2014, This application is used for this application by being referred.

Conventionally, a fuse element that melts due to self-heating when a current exceeding the rating flows and blocks the current path has been used. As the fuse element, for example, there are many holder-type fuses in which solder is sealed in a glass tube, chip fuses in which Ag electrodes are printed on the surface of a ceramic substrate, and screw-in or insert-type fuses in which a part of copper electrodes are thinned and embedded in a plastic case. is being used

Japanese Patent Laid-Open No. 2011-82064

However, in the above-mentioned conventional fuse element, it is pointed out that surface mounting by reflow is not possible, the current rating is low, and if the rating is increased by increasing the size, the problem of rapid breaking is poor.

In addition, when a fast-breaking fuse element for reflow mounting is assumed, in general, a high-melting-point solder containing Pb having a melting point of 300° C. or higher is preferable for the fuse element because of its fusing characteristics so as not to melt due to the heat of reflow. However, in the RoHS directive and the like, the use of Pb-containing solder is only limitedly recognized, and it is considered that the demand for Pb-free soldering will become stronger in the future.

That is, as a fuse element, surface mounting by reflow is possible, so the mountability to the fuse element should be excellent, it should be possible to cope with a large current by increasing the rating, and it should be fast melting breaking ability to quickly block the current path in case of overcurrent exceeding the rating (速溶斷性) is required.

Accordingly, the present invention provides a fuse element, a fuse element, a protection element, a short circuit element and a switching element that can be surface mounted and capable of improving the rating of the fuse element and the like and the fast melting property, and the flex sheet and flex sheet used therein aims to provide

In order to solve the above problems, the flex sheet according to the present invention is a flex sheet mounted on a soluble conductor of a fuse element, and the insulator is impregnated with the flex, and the insulator has a specific gravity equal to or less than that of the soluble conductor.

Further, the flax according to the present invention is a flax applied on and/or under the soluble conductor of a fuse element, to which an insulator piece having a liquid retention property is added, and the specific gravity of the insulator piece is a fluid or semi-fluid material having a specific gravity equal to or less than that of the soluble conductor.

Further, the fuse element according to the present invention has a soluble conductor and a flex sheet impregnated with a flax in an insulator whose specific gravity is equal to or less than that of the soluble conductor, and the flex sheet is mounted on the soluble conductor and/or under the soluble conductor.

In addition, the fuse element according to the present invention has a flax of a soluble conductor and a fluid or semi-fluid body to which an insulator piece having a specific gravity equal to or less than that of the soluble conductor and having liquid retention is added, and the flax is formed on and/or under the soluble conductor. Applied fuse element.

In addition, the fuse element according to the present invention has a soluble conductor and a flex sheet impregnated with a flax in an insulator whose specific gravity is less than or equal to that of the soluble conductor, and the flex sheet is mounted on the soluble conductor and/or under the soluble conductor, The fusible conductor is fused by the flowing overcurrent.

In addition, the fuse element according to the present invention has a soluble conductor, and on and/or under the soluble conductor, a fluid or semi-fluid flax containing an insulator piece having a specific gravity less than that of the soluble conductor and having liquid retention is applied, , the soluble conductor is fused by the overcurrent flowing through the soluble conductor.

In addition, the protection element according to the present invention includes an insulating substrate, a heating element formed on or inside the insulating substrate, first and second electrodes formed on the insulating substrate, and a third electrode electrically connected to the heating element; A soluble conductor connected from a first electrode to a second electrode via a third electrode, and a flex sheet impregnated with a flax in an insulator whose specific gravity is less than or equal to that of the soluble conductor, the flex sheet on the soluble conductor and/or under the soluble conductor It is mounted and cut off the soluble conductor by energizing heat of the heating element to cut off the space between the first and second electrodes.

In addition, the protection element according to the present invention includes an insulating substrate, a heating element formed on or inside the insulating substrate, first and second electrodes formed on the insulating substrate, and a third electrode electrically connected to the heating element; A fluid containing an insulator piece having a soluble conductor connected from the first electrode to the second electrode via the third electrode, the specific gravity being less than or equal to that of the soluble conductor, on the soluble conductor and/or under the soluble conductor, or A semi-fluid flex is applied, and the soluble conductor is cut by energizing heat generated by the heating element to cut off the space between the first and second electrodes.

Further, the short circuiting element according to the present invention includes an insulating substrate, a heating element formed on or inside the insulating substrate, first and second electrodes formed adjacent to the insulating substrate, and a third electrode electrically connected to the heating element And, a soluble conductor connected from the first electrode to the third electrode, and a flex sheet impregnated with a flax in an insulator whose specific gravity is less than or equal to that of the soluble conductor, the flex sheet is mounted on the soluble conductor and/or under the soluble conductor, A fusible conductor is cut by melting by energizing heat generated by the heating element, and a short circuit between the first and second electrodes and a cutoff between the first and third electrodes are performed.

Further, the short circuiting element according to the present invention includes an insulating substrate, a heating element formed on or inside the insulating substrate, first and second electrodes formed adjacent to the insulating substrate, and a third electrode electrically connected to the heating element It has a soluble conductor connected from the first electrode to the third electrode, and on and/or under the soluble conductor, the specific gravity is less than that of the soluble conductor and contains an insulator piece having liquid retention properties. Fluid or semi-fluid flex is applied, and the soluble conductor is cut by fusion by energizing heat of the heating element to perform a short circuit between the first and second electrodes and a cutoff between the first and third electrodes.

In addition, the switching element according to the present invention includes an insulating substrate, first and second heating elements formed on or inside the insulating substrate, first and second electrodes formed adjacent to the insulating substrate, and the first electrode. A third electrode formed adjacent to and electrically connected to the first heating element, a first soluble conductor connected from the first electrode to the third electrode, and a second electrode electrically connected to the second heating element and formed adjacent to the second electrode The 4th electrode, the 5th electrode formed adjacent to the 4th electrode, the 2nd soluble conductor connected from the 2nd electrode through the 4th electrode through the 5th electrode, and specific gravity is less than the specific gravity of a 1st and 2nd soluble conductor Having a flex sheet impregnated with an insulator, the flex sheet is mounted on the first and second soluble conductors and/or under the first and second soluble conductors, and the second soluble conductor is melted by energizing heat generated by the second heating element This cuts off between the 2nd and 5th electrodes, cuts the 1st soluble conductor by fusion by energization heat generation of a 1st heating element, and short-circuits between 1st and 2nd electrodes.

In addition, the switching element according to the present invention includes an insulating substrate, first and second heating elements formed on or inside the insulating substrate, first and second electrodes formed adjacent to the insulating substrate, and the first electrode. A third electrode formed adjacent to and electrically connected to the first heating element, a first soluble conductor connected from the first electrode to the third electrode, and a second electrode electrically connected to the second heating element and formed adjacent to the second electrode It has 4 electrodes, the 5th electrode formed adjacent to the 4th electrode, and the 2nd soluble conductor connected from a 2nd electrode to a 5th electrode via a 4th electrode, On a 1st and 2nd soluble conductor, and/or Under the first and second soluble conductors, a fluid or semi-fluid flax containing an insulator piece having a specific gravity equal to or less than that of the first and second soluble conductors and having liquid retention is applied, A soluble conductor is cut by melting, between 2nd and 5th electrodes is cut off, a 1st soluble conductor is cut by energization heat generation of a 1st heat generating body, and it short-circuits between 1st and 2nd electrodes.

The flex sheet according to the present invention can hold the flex on and/or under the soluble conductor by impregnating the insulator with the flax, thereby suppressing outflow and localization of the flax.

In addition, the flex according to the present invention contains an insulator piece having liquid retention, so that the flax can be held on and/or under the soluble conductor, thereby suppressing outflow and localization of the flax.

In addition, the fuse element according to the present invention can suppress the outflow and localization of the flax by impregnating the insulator with the flax to maintain the flex on and/or under the soluble conductor.

Further, in the fuse element according to the present invention, by containing an insulator piece having liquid retention properties in the flax, the flax is held on and/or under the soluble conductor, and outflow and localization of the flax can be suppressed.

Moreover, the fuse element which concerns on this invention can hold|maintain a flex on a soluble conductor and/or under a soluble conductor by impregnating an insulator with a flax, and can suppress outflow of a flax, and uneven distribution.

Further, in the fuse element according to the present invention, the flax can be held on and/or under the soluble conductor by containing an insulator piece having liquid retention properties in the flax, thereby suppressing outflow and localization of the flax.

Moreover, the protection element which concerns on this invention can hold|maintain a flax on a soluble conductor and/or under a soluble conductor by impregnating a flax in an insulator, and can suppress outflow of a flax, and uneven distribution.

Moreover, the protection element which concerns on this invention can hold|maintain a flax on a soluble conductor and/or under a soluble conductor by containing the insulator piece which has a liquid retention property in a flax, and can suppress outflow and uneven distribution of a flax.

Moreover, the short circuiting element which concerns on this invention can hold|maintain a flex on a soluble conductor and/or under a soluble conductor by impregnating a flax in an insulator, and can suppress outflow of a flax, and localization.

Moreover, the short circuiting element which concerns on this invention can hold|maintain a flax on a soluble conductor and/or under a soluble conductor by containing the insulator piece which has liquid retention property in a flax, and can suppress outflow and uneven distribution of a flax.

Moreover, the switching element which concerns on this invention can hold|maintain a flex on a soluble conductor and/or under a soluble conductor by impregnating a flax in an insulator, and can suppress outflow and localization of a flax.

Moreover, the switching element which concerns on this invention can hold|maintain a flax on and/or under a soluble conductor by containing the insulator piece which has liquid holding property in a flax, and can suppress outflow of a flax, and uneven distribution.

1 is a cross-sectional view of a fuse element to which the present invention is applied, and FIG. 1 (A) is a cross-sectional view illustrating a case having a flex sheet on a soluble conductor, and FIG. It is sectional drawing explaining this, and is sectional drawing explaining the case where FIG.
2 is a plan view of a fuse element to which the present invention is applied.
Fig. 3 (A) is a cross-sectional view showing an example of a flex sheet to which the present invention is applied, Fig. 3 (B) is a cross-sectional view showing a modified example of the flex sheet, and Fig. 3 (C) is another modification of the flex sheet. It is sectional drawing which shows an example.
4A is a plan view illustrating a case in which a flex sheet has an elliptical shape as a modified example of a fuse element to which the present invention is applied, and FIG. 4B is a modified example of a fuse element to which the present invention is applied, in which the flex sheet is circular. It is a plan view showing the case where .
5 is a cross-sectional view illustrating a modified example of a fuse element to which the present invention is applied, and FIG. It is sectional drawing explaining the case where the insulator piece containing flax was apply|coated under a soluble conductor, and FIG.5(C) is sectional drawing explaining the case where the insulator piece containing flax was apply|coated respectively above and below a soluble conductor.
6A is a plan view showing a case in which the insulator piece-containing flax is applied in an oval shape as a modified example of the fuse element to which the present invention is applied, and FIG. 6B is a modified example of the fuse element to which the present invention is applied. It is a top view which shows the case where the insulator piece containing flax was apply|coated circularly.
7 is a cross-sectional view showing a fuse element to which the present invention is applied, FIG. 7 (A) is a cross-sectional view illustrating a case where a flex sheet is mounted on a soluble conductor, and FIG. It is sectional drawing explaining the case where each flex sheet is mounted under a conductor.
Fig. 8 is a plan view showing a fuse element to which the present invention is applied with a cover member removed.
It is sectional drawing which shows the state which the soluble conductor of the fuse element to which this invention was applied melted.
10A is a circuit diagram before the soluble conductor of the fuse element to which the present invention is applied is fused, and FIG. 10B is a circuit diagram after the soluble conductor of the fuse element to which the present invention is applied is fused.
11 is a cross-sectional view showing a modified example of the fuse element to which the present invention is applied. It is sectional drawing explaining the case where a flex sheet is mounted respectively under an upper and a soluble conductor.
12 is a cross-sectional view showing another modified example of the fuse element to which the present invention is applied. It is sectional drawing explaining the case where the insulator piece containing flax was respectively apply|coated on a soluble conductor and under a soluble conductor.
13 is a cross-sectional view of a protection element to which the present invention is applied, FIG. 13 (A) is a cross-sectional view illustrating a case where a flex sheet is mounted on a soluble conductor, and FIG. 13 (B) is a soluble conductor on and under the soluble conductor It is sectional drawing explaining the case where each flex sheet is mounted.
Fig. 14(A) is a plan view showing the protection element to which the present invention is applied by removing the cover member, and Fig. 14(B) is a circuit diagram before the soluble conductor of the protection element to which the present invention is applied is cut by melting.
It is sectional drawing which shows the state which the soluble conductor of the protection element to which this invention was applied melted.
Figure 16 (A) is a plan view showing the removal of the cover member in a state in which the soluble conductor of the protection element to which the present invention is applied is fused, Figure 16 (B) is a soluble conductor in the protection element to which the present invention is applied This is the circuit diagram later.
It is sectional drawing which shows the modified example of the protection element to which this invention was applied, (A) of FIG. 17 is sectional drawing explaining the case where a flex sheet is mounted on a soluble conductor, (B) of FIG. 17 is a soluble conductor It is sectional drawing explaining the case where a flex sheet is mounted respectively under an upper and a soluble conductor.
Fig. 18 is a cross-sectional view showing another modified example of the protection element to which the present invention is applied, Fig. 18 (A) is a cross-sectional view illustrating a case in which an insulator piece-containing flax is applied on a soluble conductor, Fig. 18 (B) It is sectional drawing explaining the case where the insulator piece containing flax was respectively apply|coated on a soluble conductor and under a soluble conductor.
It is a top view which removes the cover member and shows the short circuiting element to which this invention was applied.
20 is a cross-sectional view of a short circuiting element to which the present invention is applied, FIG. 20 (A) is a cross-sectional view illustrating a case where a flex sheet is mounted on a soluble conductor, and FIG. 20 (B) is a soluble conductor on and under the soluble conductor It is sectional drawing explaining the case where each flex sheet is mounted.
It is sectional drawing which shows the state which the soluble conductor of the short circuiting element to which this invention was applied melted.
Fig. 22 (A) is a circuit diagram before the soluble conductor of the shorting element to which the present invention is applied is fused, and Fig. 22 (B) is a circuit diagram after the soluble conductor of the shorting element to which the present invention is applied is fused.
23 : is sectional drawing which shows the modified example of the short circuiting element to which this invention was applied, (A) of FIG. 23 is sectional drawing explaining the case where a flex sheet is mounted on a soluble conductor, (B) of FIG. 23 is a soluble conductor It is sectional drawing explaining the case where a flex sheet is mounted respectively under an upper and a soluble conductor.
Fig. 24 is a cross-sectional view showing another modified example of the short circuiting element to which the present invention is applied, Fig. 24 (A) is a cross-sectional view for explaining a case where an insulator piece-containing flax is applied on a soluble conductor, Fig. 24 (B) It is sectional drawing explaining the case where the insulator piece containing flax was respectively apply|coated on a soluble conductor and under a soluble conductor.
25 is a plan view showing another modified example of the short circuiting element to which the present invention is applied.
Fig. 26 is a cross-sectional view showing another modified example of the short circuiting element to which the present invention is applied, Fig. 26 (A) is a cross-sectional view illustrating a case where a flex sheet is mounted on a soluble conductor, It is sectional drawing explaining the case where a flex sheet is mounted respectively under a conductor and a soluble conductor.
27 is a cross-sectional view showing another modified example of the short circuiting element to which the present invention is applied, and FIG. ) is a cross-sectional view illustrating a case in which a flex sheet is mounted on two soluble conductors and under two soluble conductors, respectively.
Fig. 28 is a cross-sectional view showing another modified example of the shorting element to which the present invention is applied, Fig. 28 (A) is a cross-sectional view explaining the case where a flex sheet is mounted on a soluble conductor, It is sectional drawing explaining the case where a flex sheet is mounted respectively under a conductor and a soluble conductor.
29 is a cross-sectional view showing another modified example of the short circuiting element to which the present invention is applied, and FIG. ) is a cross-sectional view illustrating a case in which a flex sheet is mounted on two soluble conductors and under two soluble conductors, respectively.
30 is a cross-sectional view showing another modified example of the short circuiting element to which the present invention is applied, and FIG. It is sectional drawing explaining the case where the insulator piece containing flax was respectively apply|coated on a soluble conductor and under a soluble conductor.
It is a top view which removes the cover member and shows the switching element to which this invention was applied.
Fig. 32 is a cross-sectional view of a switching element to which the present invention is applied, Fig. 32 (A) is a cross-sectional view illustrating a case where a flex sheet is mounted on a soluble conductor, and Fig. 32 (B) is a soluble conductor on and under the soluble conductor It is sectional drawing explaining the case where each flex sheet is mounted.
It is a circuit diagram before the soluble conductor of the switching element to which this invention was applied is fused.
It is a circuit diagram after the soluble conductor of the switching element to which this invention was applied is cut by melting.
It is sectional drawing which shows the state which the soluble conductor of the switching element to which this invention was applied melted.
It is a top view which removes a cover member and shows the switching element to which this invention was applied, and is a figure explaining the state which the 2nd soluble conductor melted faster than a 1st soluble conductor.
It is a top view which removes a cover member and shows the switching element to which this invention was applied, and is a figure explaining the state which both a 1st soluble conductor and a 2nd soluble conductor fuse|melted.
It is sectional drawing which shows the modification of the switching element to which this invention was applied, (A) of FIG. 38 is sectional drawing explaining the case where a flex sheet is mounted on a soluble conductor, (B) of FIG. 38 is a soluble conductor It is sectional drawing explaining the case where a flex sheet is mounted respectively under an upper and a soluble conductor.
Fig. 39 is a cross-sectional view showing another modified example of the switching element to which the present invention is applied, and Fig. 39 (A) is a cross-sectional view explaining a case where the insulator piece-containing flax is applied integrally on two soluble conductors, Fig. 39 It is sectional drawing explaining the case where (B) of two soluble conductors and under two soluble conductors respectively integrated and apply|coated the insulator piece containing flax.
40 is a cross-sectional view showing another modified example of the switching element to which the present invention is applied, and FIG. It is sectional drawing explaining the case where (B) mounted a flex sheet individually on two soluble conductors and under two soluble conductors, respectively.
41 is a cross-sectional view showing another modified example of the switching element to which the present invention is applied, and FIG. It is sectional drawing explaining the case where (B) mounted a flex sheet individually on two soluble conductors and under two soluble conductors, respectively.
42 is a cross-sectional view showing another modified example of the switching element to which the present invention is applied, and FIG. 42(B) is a cross-sectional view explaining the case where the insulator piece containing flax was apply|coated individually on two soluble conductors and under two soluble conductors, respectively.

Hereinafter, a fuse element, a fuse element, a protection element, a short circuit element and a switching element to which the present invention is applied, and a flex sheet and flex used therefor will be described in detail with reference to the drawings. In addition, this invention is not limited only to the following embodiment, It goes without saying that various changes are possible within the range which does not deviate from the summary of this invention. In addition, drawings are schematic, and the ratio of each dimension, etc. may differ from an actual thing. Specific dimensions and the like should be determined in consideration of the following description. In addition, it goes without saying that parts with different dimensional relationships and ratios are included even between the drawings.

[Fuse Element]

First, a fuse element to which the present invention is applied will be described. The fuse element 1 to which the present invention is applied is also used for a fuse element, a protection element, a short circuit element and a switching element which will be described later, and is fused by self-heating (Joule heat) when a current exceeding the rating is passed, or heat generation of a heating element will be cut off by The fuse element 1 is formed by laminating a high-melting-point solder containing lead as a main component and three or more metal layers having different melting points. For example, in the case of a metal laminate of three or more layers having different melting points, as shown in FIGS. It has the low-melting-point metal layer 3 whose melting|fusing point is lower than the melting|fusing point metal layer 2, and the flex sheet 5, for example, as shown in FIG. 2, it is formed in the substantially rectangular plate shape. The high-melting-point metal layer 2 and the low-melting-point metal layer 3 constitute the soluble conductor 6 .

[Soluble conductor]

For the high-melting-point metal layer 2, for example, Ag, Cu, or an alloy containing Ag or Cu as a main component is suitably used, and it does not melt even when the fuse element 1 is mounted on an insulating substrate by a reflow furnace. does not have a high melting point.

For the low-melting-point metal layer 3, for example, Sn or an alloy containing Sn as a main component, a material generally called "Pb-free solder" is suitably used. The melting point of the low-melting-point metal layer 3 is not necessarily higher than the temperature in the reflow furnace, and may be melted at about 200°C.

The fuse element 1 is formed by laminating three or more metal layers having different melting points, so that the fuse element, the protection element, the short circuit element, and the switching element are excellent in mountability to an insulating substrate, and the fuse element 1 is used It is possible to improve the mountability of each device to an external circuit board. Moreover, the fuse element 1 can implement|achieve the improvement of a rating and rapid melting|fusing property in each element.

That is, since the fuse element 1 includes the high-melting-point metal layer 2, even when exposed for a short time to a high-temperature environment equal to or higher than the melting point of the low-melting-point metal layer 3 by an external heat source such as a reflow furnace, melting or deformation is prevented. Thus, it is possible to prevent the deterioration of the fusing characteristics accompanying the initial cut-off, the initial short circuit, or the fluctuation of the rating. Therefore, in the fuse element 1, mounting of each element, such as a fuse element, on an insulating substrate, and mounting of each element, such as a fuse element, on an external circuit board can be efficiently realized by reflow mounting, and mountability is achieved. can improve

Moreover, since the fuse element 1 is comprised by laminating|stacking the low-resistance high-melting-point metal layer 2, compared with the soluble conductor using the conventional lead-type high-melting-point solder, conductor resistance can be reduced significantly. In addition, by laminating the low melting point metal layer 3 and the high melting point metal layer 2, the melting temperature of the fuse element 1 can be reduced to about 300 to 400 ° C. Compared with a conventional chip fuse of the same size, the current rating can be significantly improved. Moreover, thickness reduction can be achieved compared with the conventional chip fuse which has the same current rating, and it is excellent in quick-melting property.

[Flex Sheet]

The fuse element 1 is as shown in FIG. 2 for preventing oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3 of the fusible conductor 6, removing oxides during melting and improving the fluidity of the solder. Similarly, the flex sheet 5 is mounted over the entire surface of the outermost layer of the soluble conductor 6 .

In addition, as shown in FIG. 1(A), the flex sheet 5 is mounted on the soluble conductor 6, as shown in FIG. 1(B), the soluble conductor 6 You may comprise so that it may be mounted below, ie, contact with the lower surface of the soluble conductor 6 . In addition, in the case of mounting the flex sheet 5 under the soluble conductor 6, and when the fuse element 1 is connected to the substrate of each element downward, a connection margin is secured on the lower surface of the soluble conductor 6 There is a need. For this reason, it is preferable to make the flex sheet 5 smaller than the area of the lower surface of the soluble conductor 6, and the sheet body in which the connection part was opened may be sufficient.

In addition, as shown in FIG.1(C), the flex sheet 5 other than having demonstrated with FIG.1(A) and FIG.1(B), the soluble conductor 6 top and the soluble conductor 6 ) may be mounted under the By mounting the flex sheets 5 above and below the soluble conductor 6, respectively, more stable oxide removal at the time of fusion cutting and the improvement of the fluidity|liquidity of a solder are expectable. In addition, since each top and bottom of the soluble conductor 6 is the same as what was demonstrated with FIG.1(A) and FIG.1(B), description is abbreviate|omitted as for the flex sheet 5 shown to FIG.1(C).

The flex sheet 5 is, as shown in Fig. 3 (A), Fig. 3 (B), and Fig. 3 (C), a fluid or semi-fluid flex 7 to a sheet-shaped support body 8. It is impregnated and held, for example, a nonwoven fabric or a mesh base material impregnated with the flex 7, or a nonwoven fabric or mesh base paper is applied on the flex 7 applied to the outermost layer of the fuse element 1 arranged and impregnated with the flax (7). The flex sheet 5 can hold the fluid or semi-fluid flex 7 by the support 8 having liquid retention properties.

Here, since the support body 8 is used by mounting the flex sheet 5 on the soluble conductor 6 and/or under the soluble conductor 6, electrical properties such as melting of the soluble conductor 6 are not affected. Use an insulator to avoid it. As the material for forming the support 8 , various materials can be used depending on the structure thereof. For example, an insulator such as resin or glass is suitable.

As an example of a specific structure, the flex sheet 5 is obtained by impregnating the flex 7 into the porous support 8 in FIG. 3A . The porous material may be a structure in which a plurality of holes penetrating in the vertical direction of the sheet are formed as shown in Fig. 3A, or a structure in the form of a sponge. That is, the flex sheet 5 is a structure having a large number of voids, such as a porous body and a sponge body, thereby improving liquid retention, and placing the flex sheet 5 on the soluble conductor 6 and/or under the soluble conductor 6 . You can keep it where you want it.

Further, the flex sheet 5 is obtained by impregnating the flex 7 in the support 8 which is a nonwoven fabric or a mesh-shaped base in FIG. 3B . The base is a fibrous structure as shown in Fig. 3B. That is, the flex sheet 5 can improve the liquid retention by the fibrous structure, and can hold the flex sheet 7 at a desired position on the soluble conductor 6 and/or under the soluble conductor 6 .

In addition, in Fig. 3(C), the flex sheet 5 is formed by kneading the needle-like and short-fiber-like support 8 with the flex 7 and drying it. The needle shape and the single fiber shape will be described in detail in the description of the flex described later. The flex sheet 5 can improve liquid retention by a needle-shaped and short-fiber-like structure, and can hold the flex sheet 7 at a desired position on the soluble conductor 6 and/or under the soluble conductor 6 .

Here, as the support body 8, although various insulators which hold the flex 7 and have liquid retention properties can be used, at least up to the mounting temperature of the fuse element 1 or each element using the same, on the soluble conductor 6 It is necessary to keep the flex (7) at Therefore, since the support 8 needs heat resistance enough to maintain its shape, a material that deforms or melts at a temperature exceeding the mounting temperature of the fuse element 1 or each element using the same is used. can That is, at the temperature at the time of melting of the soluble conductor 6 exceeding the mounting temperature, the need to hold the flex 7 on the soluble conductor 6 is no longer necessary, so the support 8 together with the flex 7 is melt and flow. When the support body 8 has a melt|melting or fluidity|liquidity, at the time of melting of the soluble conductor 6, the support body 8 does not remain, and an insulating characteristic can be improved.

More specifically, for the support 8, it is preferable to use a material having fluidity by deforming or melting at a temperature of 300° C. or higher.

Moreover, as for the support body 8, it is preferable to make specific gravity or less specific gravity of the soluble conductor 6 into being. It is because it is necessary to lighten the support body 8 in order to combine a molten conductor at the time of the melting of the soluble conductor 6, and it is. That is, if the specific gravity of the support 8 is larger than that of the fusible conductor 6 , the support 8 presses the molten conductor, so that the molten conductor is difficult to coalesce and the fusing property as the fuse element 1 is deteriorated. because there are concerns.

Among the volume of the soluble conductor 6, since the low-melting-point metal layer 3 occupies most of the volume, the specific gravity of the support 8 is preferably equal to or less than that of the low-melting-point metal layer 3, more specifically It is preferable to use a material with a specific gravity of 5 g/cm ^{3 or less.}

The flex sheet 5 has an area larger than the surface area of the soluble conductor 6, as shown in FIG. Thereby, even when the soluble conductor 6 is completely covered with the flex sheet 5 and the volume expand|swells by melting, the oxidation removal by the flex 7 reliably and the rapid melting|fusing by improvement of wettability are performed. can be realized In addition, when the flex sheet 5 is mounted on the lower surface of the soluble conductor 6 as shown in FIG.1(B), FIG.1(C), narrower than the surface area of the soluble conductor 6 have an area Thereby, while the lower surface of the soluble conductor 6 is coat|covered with the flex sheet 5, it becomes possible to ensure the connection margin to the board|substrate of each element.

Further, the flex sheet 5 may have a circular or elliptical shape as shown in Figs. 4A and 4B. The flex sheet 5 can obtain a circular or elliptical shape by using a punch process etc. for the sheet|seat sufficiently larger than the surface area of the soluble conductor 6, for example.

When the flex sheet 5 is circular or elliptical, it is preferable that the diameter of a circle or an ellipse is larger than the short side of the rectangular soluble conductor 6 at least. In addition, it is preferable to make the position where the flex sheet 5 is mounted into the position where the center of a circle or an ellipse overlaps with the fusion|melting edge part of the soluble conductor 6 .

By mounting the flex sheet 5 on the soluble conductor 6 and/or under the soluble conductor 6 , the flex is applied over the entire surface of the soluble conductor 6 also in the heat treatment process at the time of mounting the fuse element 1 . It can be maintained, while improving the wettability of the low-melting-point metal layer 3 (eg, solder) of the soluble conductor 6, and removing the oxide while the low-melting-point metal layer 3 is dissolving, and the high-melting-point metal ( For example, the erosion action on Ag) can be used to improve the fast melting properties.

In addition, by mounting the flex sheet 5 on the soluble conductor 6 and/or under the soluble conductor 6, on the surface of the refractory metal layer 2 of the outermost layer of the soluble conductor 6, Sn as a main component Even when an antioxidant film such as Pb-free solder is formed, the oxide of the antioxidant film can be removed, the oxidation of the high-melting-point metal layer 2 can be effectively prevented, and the rapid melting property can be maintained and improved.

[Flex with insulator piece]

In addition, in order to obtain substantially the same effect as the flex sheet 5, the flex 7 of the fluid or semi-fluid body is not impregnated with the flex 7 of the fluid or semi-fluid body in the sheet-like support 8, and the flex 7 of the fluid or semi-fluid body has a needle shape or a step. You may make it apply|coat on the soluble conductor 6 and/or under the soluble conductor 6 the insulator piece containing flax 9 which kneaded and contained the insulator piece 10 of the fiber.

As shown in FIG. 5A , the insulator piece-containing flex 9 is composed of a fluid or semi-fluid flex 7 and a needle-shaped or short-fiber insulator piece 10 .

As the flex 7, the same flax to be impregnated into the above-described flex sheet 5 can be used.

The insulator piece 10 is a needle-shaped or short-fiber insulator. As the insulator piece 10, for example, glass fibers or nonwoven fabrics finely separated into short fibers can be used. Each of the insulator pieces 10 has a length within a range that does not affect the fluidity of the flex 7, so that when mixed with the flex 7, they become entangled with each other, or flex between each other by surface tension. (7) is to be maintained so as to have a structure having a predetermined surface area.

In addition, the shape of the insulator piece 10 is not limited to needle-shaped or short fibers, for example, it may have a crotch-shaped structure, and may have a structure in which they are intertwined by a crotch-shaped structure. In addition, the insulator piece 10 is not limited to the thing of a single shape, You may make it different in shape and length individually.

As shown in Fig. 5(A), the insulator piece containing flex 9 is applied on the soluble conductor 6, and as shown in Fig. 5(B), the soluble conductor 6 You may comprise so that it may apply|coat below, ie, apply|coat to the lower surface of the soluble conductor 6 . In addition, in the case where the insulator piece containing flex 9 is applied under the soluble conductor 6, and when the fuse element 1 is connected to the substrate of each element downward, a connection allowance is provided on the lower surface of the fusible conductor 6 need to secure For this reason, it is preferable to apply|coat the insulator piece containing flax 9 smaller than the area of the lower surface of the soluble conductor 6, and it is preferable to avoid and apply|coat a connection part.

In addition, as shown in FIG.5(C) other than having demonstrated with FIG.5(A) and FIG.5(B), the insulator piece containing flex 9 is the soluble conductor 6 phase and a soluble conductor You may make it apply|coat each under (6). By apply|coating the insulator piece containing flax 9 respectively on the upper and lower sides of the soluble conductor 6, more stable oxide removal at the time of fusion cutting, and the improvement of the fluidity|liquidity of a solder can be anticipated. In addition, since each of the top and bottom of the soluble conductor 6 is the same as that demonstrated with FIG.5(A) and FIG.5(B), description is abbreviate|omitted as for the insulator piece containing flex 9 shown in FIG.5(C). do.

As shown in Fig. 6(A) or Fig. 6(B), the flax 9 containing the insulator piece 10 containing the above-described insulator piece 10 is applied to the fusible conductor 6 in a circular or oval shape. , while being able to hold the flex 7 on the same basis as the flex sheet 5, and compared with the flex sheet 5, it is possible to simplify the sheet production and sheet mounting process, and to apply the flex to the conventional soluble conductor It can be implemented without changing the manufacturing process.

In addition, from the viewpoint of removing oxides at the time of fusion cutting and improving the fluidity of the solder, the flax 9 containing the insulator piece is applied in a rectangular shape over the entire surface on the soluble conductor 6 and/or under the soluble conductor 6 more preferably. However, in the connection part to each element under the soluble conductor 6, without apply|coating the insulator piece containing flax 9, it is necessary to leave a connection margin, FIG.1(B), FIG.1 Needless to say, it is the same as the case described in (C).

[Laminate structure of fuse element]

In the fuse element 1, the inner layer provided between the pair of high-melting-point metal layers 2 is the low-melting-point metal layer 3, and the outer layer is the high-melting-point metal layer 2, so that each element such as a fuse element is It is possible to improve the immunity (pulse resistance) against the surge when a very high voltage is momentarily applied to the built-in electrical system. That is, in the fuse element 1, the soluble conductor 6 should not be fused until, for example, a current of 100 A flows for several msec. In this respect, since a large current flowing in an extremely short time flows through the surface layer of the conductor (skin effect), the fuse element 1 has a high melting point metal layer 2 such as Ag plating having a low resistance value as an outer layer of the soluble conductor 6 Since it is provided, it is easy to flow the electric current applied by the surge, and melting by self-heating can be prevented. Accordingly, the fuse element 1 can significantly improve the resistance to surges compared to the conventional fuse containing a solder alloy.

Moreover, it is preferable that the above-mentioned fuse element 1 makes the volume of the low-melting-point metal layer 3 of the soluble conductor 6 larger than the volume of the high-melting-point metal layer 2 . By increasing the volume of the low-melting-point metal layer 3 in the fuse element 1 , it is possible to effectively perform melting for a short time by erosion of the high-melting-point metal layer 2 .

[Manufacturing method]

The fuse element 1 forms the soluble conductor 6 into a film by depositing the high-melting-point metal 2 into a film using the plating technique on the surface of the low-melting-point metal layer 3, The soluble conductor 6 phase and/or a soluble conductor It can be manufactured by mounting the flex sheet 5 under (6).

The soluble conductor 6 can be efficiently manufactured, for example by performing Ag plating on the surface of elongate solder foil, and can be used easily by cutting|disconnecting according to a size in the case of use.

In addition, you may manufacture the soluble conductor 6 by bonding the low-melting-point metal foil which comprises the low-melting-point metal layer 3, and the high-melting-point metal foil which comprises the high-melting-point metal layer 2 together. The soluble conductor 6 is produced by sandwiching, for example, the solder foil constituting the low-melting-point metal layer 3 rolled similarly between two rolled Cu foils or Ag foils, laminating and pressing. can In this case, as for the low-melting-point metal foil, it is preferable to select a material softer than the high-melting-point metal foil. Thereby, the fluctuation|variation in thickness can be absorbed and low-melting-point metal foil and high-melting-point metal foil can be closely_contact|adhered without a clearance gap. In addition, since the film thickness of low-melting-point metal foil becomes thin by pressing, it is good to thicken it beforehand. When low-melting-point metal foil protrudes from the end surface of a soluble conductor by press, it is preferable to cut out and to trim a shape.

In addition, the soluble conductor 6 is a soluble conductor 6 in which the low-melting-point metal layer 3 and the high-melting-point metal layer 2 are laminated even by using a thin film formation technique such as vapor deposition or other well-known lamination techniques. can be formed

In addition, when the soluble conductor 6 makes one refractory-point metal layer 2 an outermost layer, it may form the antioxidant film which is not shown in the surface of the refractory-point metal layer 2 of the said outermost layer further. In the soluble conductor 6, the refractory metal layer 2 of the outermost layer is further coated with an anti-oxidation film, for example, even when Cu plating or Cu foil is formed as the refractory metal layer 2, oxidation of Cu can be prevented Therefore, the soluble conductor 6 can prevent the situation where the melting time becomes long by oxidation of Cu, and can be cut by melting in a short time.

In addition, as the high-melting-point metal layer 2, an inexpensive but easily oxidized metal such as Cu can be used, and the soluble conductor 6 can be formed without using an expensive material such as Ag.

For the high-melting-point metal anti-oxidation film, the same material as that of the low-melting-point metal layer 3 can be used. For example, Pb-free solder containing Sn as a main component can be used. In addition, an antioxidant film can be formed by giving tin plating on the surface of the high-melting-point metal layer 2 . In addition, the antioxidant film can also be formed by Au plating or pre-flax.

Then, the process of mounting the flex sheet 5 on the soluble conductor 6 is demonstrated. First, the flex sheet 5 is a mother by impregnating the flex 7 into a support 8 that is sufficiently larger than the area of the soluble conductor 6, heating it in an oven or the like, and drying and solidifying the solvent powder of the flex 7 It can produce by producing a sheet|seat, and cutting|disconnecting from this mother sheet|seat to a desired size. Moreover, the flex sheet 5 can also be produced directly, without producing a mother sheet. In this case, the step of cutting the flex sheet 5 can be omitted.

Then, the cut out flex sheet 5 is mounted on the soluble conductor 6 so that the soluble conductor 6 may be completely covered. Further, as a fixing agent for temporarily fixing the flex sheet 5 on the soluble conductor 6, a small amount of the liquid flex 7 is dripped or applied, the flex sheet 5 is loaded and dried, so that the soluble conductor 6 is The flex sheet 5 can be mounted on it. In addition, when mounting the flex sheet 5 under the soluble conductor 6, in a state with the lower surface of the soluble conductor 6 facing upward, the flex sheet 5 smaller than the surface area of the lower surface of the soluble conductor 6 Mount it. Further, as a fixing agent for temporarily fixing the flex sheet 5 under the soluble conductor 6, a small amount of the liquid flex 7 is dripped or applied, the flex sheet 5 is loaded, and by drying, under the soluble conductor 6 The flex sheet 5 can be mounted. In addition, when mounting the flex sheet 5 on the soluble conductor 6 and under the soluble conductor 6, respectively, you may make it mount the flex sheet 5 for every single side|surface of the soluble conductor 6, but two flex sheets One or both of (5) may be temporarily fixed, and the fixing agent may be dried by heating at the time of adhering the cover member of each element described later.

In addition, another example in which the flex sheet 5 is mounted on the soluble conductor 6 is demonstrated. The support body 8 corresponding to the magnitude|size of the flex sheet 5 is cut out from the mother support body sufficiently larger than the area of the soluble conductor 6 . Next, after apply|coating or dripping the flax 7 on the soluble conductor 6, before drying the flax 7, the cut out support body 8 is mounted. Since the support body 8 has a liquid retention property, it absorbs the flex 7 and is integrated with the flex 7 . Thereafter, the flex sheet 5 is formed by drying and solidifying the solvent powder in the flax 7 through a drying step. In addition, when mounting the flex sheet 5 under the soluble conductor 6, in the state which turned the lower surface of the soluble conductor 6 upward, the flex 7 was apply|coated or dripped on the lower surface of the soluble conductor 6 Then, before drying the flex 7, the support body 8 cut out smaller than the surface area of the lower surface of the soluble conductor 6 is mounted. Since the support body 8 has a liquid retention property, it absorbs the flex 7 and is integrated with the flex 7 . Then, the flex sheet 5 is formed in the lower surface of the soluble conductor 6 by drying and solidifying the solvent powder of the flax 7 through a drying process.

By using this process, the process of manufacturing the flex sheet 5 in advance can be omitted, and the fuse element 1 can be manufactured only by loading the support 8 after the normal flex 7 application process. Therefore, a complicated manufacturing process is not required.

In addition, the example in the case where the flex sheet 5 is not mounted on the soluble conductor 6, ie, the case where the insulator piece containing flex 9 is used, is demonstrated. On the soluble conductor 6, the insulator piece containing plex 9 having fluidity or semi-fluidity is applied or dripped, and the insulator piece containing flax 9 spreads on the soluble conductor 6, whereby the flex sheet 5 It is possible to obtain approximately the same configuration and effect as Moreover, when apply|coating the insulator piece containing flax 9 under the soluble conductor 6, the insulator piece containing flax 9 to the lower surface of the soluble conductor 6 in the state which turned the lower surface of the soluble conductor 6 upward. By applying or dropping the flax 9 containing an insulator piece to the lower surface of the soluble conductor 6, the configuration and effect substantially equivalent to that of the flex sheet 5 can be obtained.

By using this step, the step of pre-fabricating the flex sheet 5 can be omitted, and only the insulator piece-containing plex 9 is applied using the same process as that of the normal flax 7 application. , the fuse element 1 can be manufactured, which does not require complicated manufacturing processes.

Subsequently, the fuse element, the protection element, the short circuit element, and the switching element which used the fuse element 1 mentioned above are demonstrated. In addition, in the following description, although each element using the fuse element 1 is demonstrated, it goes without saying that the fuse element 1 and its modification may be used for each element. In addition, below, the same code|symbol is attached|subjected about the element substantially equivalent to that demonstrated by the fuse element 1, and description is abbreviate|omitted.

[Fuse element (self-heating cutoff)]

A fuse element 80 to which the present invention is applied, as shown in FIG. 7A , includes an insulating substrate 81 , and first and second electrodes 82 and 83 provided on the insulating substrate 81 . and the first and second electrodes 82 , 83 , and are fused by self-heating when a current exceeding the rated current flows, and between the first electrode 82 and the second electrode 83 . A fuse element (1) for blocking the current path of the , and a cover member (89) for covering the fuse element (1) on the insulating substrate (81). The fuse element 1 is comprised by the soluble conductor 6 and the flex sheet 5 mounted on the soluble conductor 6 and/or under the soluble conductor 6 .

The insulating substrate 81 is formed in a rectangular shape by, for example, an insulating member such as alumina, glass ceramics, mullite, or zirconia. In addition, for the insulating board|substrate 81, you may use the material used for printed wiring boards, such as a glass epoxy board|substrate and a phenol board|substrate.

First and second electrodes 82 and 83 are formed at opposite ends of the insulating substrate 81 . Each of the first and second electrodes 82 and 83 is formed of a conductive pattern such as Ag or Cu wiring, and is appropriately formed on the surface thereof as a countermeasure against oxidation such as Sn plating, Ni/Au plating, Ni/Pd plating, Ni/ A protective layer 86 such as Pd/Au plating is provided. Further, the first and second electrodes 82 and 83 are first and second external connection electrodes 82a and 83a formed from the front surface 81a of the insulating substrate 81 on the back surface 81b through casting. ) and is continuous. The fuse element 80 is mounted on the current path of the circuit board through the first and second external connection electrodes 82a and 83a formed on the back surface 81b.

As for the 1st and 2nd electrodes 82 and 83, the soluble conductor 6 of the fuse element 1 is connected via the connection material 88, such as solder. As described above, since the fuse element 1 has improved resistance to a high-temperature environment because the soluble conductor 6 includes the high-melting-point metal layer 2, it is excellent in mountability, and the connection material 88 is used. After being mounted between the first and second electrodes 82 and 83 through the connection, they can be easily connected by reflow soldering or the like.

[Soluble conductor]

About the soluble conductor 6, in order to use the thing substantially equivalent to what was demonstrated with the fuse element 1 mentioned above, illustration is abbreviate|omitted about description and a layer structure. The same applies to all the following embodiments.

[Flex Sheet]

The fuse element 80 is used to prevent oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3, to remove oxides during melting, and to improve the fluidity of the solder, as shown in FIG. 7A, The flex sheet 5 over the entire surface of the outermost layer on the soluble conductor 6 is mounted. In addition, about the flex sheet 5, since the thing substantially equivalent to that demonstrated for the fuse element 1 mentioned above is used, illustration is abbreviate|omitted about description and an internal structure. In addition, as shown in FIG. 7(B), mounting the flex sheet 5 under the fusible conductor 6 is applicable with the case demonstrated by the above-mentioned fuse element 1, but on the fusible conductor 6 Only the example in which the flex sheet 5 is mounted is described, and detailed illustration and description are omitted. The same applies to all the following embodiments.

The flex sheet 5 is obtained by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, a non-woven fabric or mesh-shaped base material impregnated with the flex 7, or A nonwoven fabric or a mesh-shaped base paper is arranged on the flax 7 applied to the outermost layer of the soluble conductor 6, and the flax 7 is impregnated.

As shown in FIG. 8 , it is preferable that the flex sheet 5 has an area larger than the surface area of the soluble conductor 6 . Thereby, even when the soluble conductor 6 is completely covered with the flex sheet 5 and the volume expands due to melting, the oxidation removal by the flex 7 and rapid melting by improvement of wettability are reliably prevented. can be realized

By mounting the flex sheet 5 on the soluble conductor 6 , the flex 7 is applied to the whole of the soluble conductor 6 in the heat treatment step at the time of mounting the fuse element 1 or mounting the fuse element 80 . It can be maintained across the surface, and at the time of actual use of the fuse element 80, the wettability of the low-melting-point metal layer 3 (eg, solder) is improved, and the first and second low-melting-point metals are dissolved. It is possible to improve the rapid melting property by removing the oxide from the copper and using the erosion action on the high melting point metal (eg Ag).

Moreover, even when an antioxidant film, such as Pb-free solder which has Sn as a main component, is formed on the surface of the high melting-point metal layer 2 of the outermost layer of the soluble conductor 6 by arranging the flex sheet 5, the said oxidation The oxide of the barrier film can be removed, the oxidation of the high-melting-point metal layer 2 can be effectively prevented, and the rapid melting property can be maintained and improved.

[No cover]

The fuse element 80 is a cover member 89 that protects the inside and prevents scattering of the fuse element 1 on the surface 81a of the insulating substrate 81 on which the fuse element 1 is provided. is installed

The cover member 89 can be formed of a member having insulating properties, such as various engineering plastics and ceramics. In the fuse element 80 , since the fuse element 1 is covered by the cover member 89 , the molten metal is transferred to the cover member 89 even during self-heating interruption accompanying generation of arc discharge due to overcurrent. It is captured by the scattering of the surrounding, and can be prevented.

Further, the cover member 89 has a projection 89b extending from the ceiling surface 89a toward the insulating substrate 81 to at least the side surface of the flex sheet 5 . As for the cover member 89, since the side surface of the flex sheet 5 is restricted from movement by the protrusion 89b, it is possible to prevent the flex sheet 5 from being misaligned. That is, the projection 89b has a size that maintains a predetermined clearance rather than the size of the flex sheet 5 , and is provided corresponding to a position where the flex sheet 5 is to be held. In addition, the protrusion part 89b is good also as a wall surface which goes around and covers the side surface of the flex sheet 5, and may protrude partially.

Further, the cover member 89 has a configuration in which a predetermined interval is provided between the flex sheet 5 and the ceiling surface 89a. As shown in FIG. 9, when the soluble conductor 6 melts, it is because the clearance for the melted conductor to push up the flex sheet 5 is needed.

Therefore, as for the cover member 89, the height (height to the ceiling surface 89a) of the inner space of the cover member 89 is the molten conductor 6 on the surface 81a of the insulating substrate 81. It is comprised so that it may become larger than the sum of the height (when divided into several molten conductors, the highest height among the molten conductors) and the thickness of the flex sheet 5. As shown in FIG.

[Mount state]

Next, the mounting state of the fuse element 80 is demonstrated. As for the fuse element 80, as shown in FIG. 7, the soluble conductor 6 is spaced apart from the surface 81a of the insulated substrate 81, and is mounted.

On the other hand, in the fuse element in which a soluble conductor is in contact with the surface of an insulating substrate, such as forming a soluble conductor on the surface of an insulating substrate by printing, between 1st, 2nd electrodes, the molten metal of a soluble conductor adheres on an insulating substrate. and leakage occurs. For example, in a fuse element in which a soluble conductor is formed by printing Ag paste on a ceramic substrate, ceramic and Ag are sintered and permeate, and remain between the first and second electrodes. Therefore, a leakage current flows between the first and second electrodes due to the residue, and the current path cannot be completely blocked.

In this point, in the fuse element 80, the soluble conductor 6 is formed separately from the insulated substrate 81 alone, and it is spaced apart from the surface 81a of the insulated substrate 81, and is mounted. Therefore, in the fuse element 80 , even when the soluble conductor 6 is melted, the molten metal does not penetrate into the insulating substrate 81 , but is drawn on the first and second electrodes 82 and 83 , and the first , the second electrodes 82 and 83 may be insulated.

In addition, although the fuse element 80 can connect the soluble conductor 6 on the 1st, 2nd electrodes 82, 83 by reflow soldering as mentioned above, in addition, the fuse element 80 , You may connect the soluble conductor 6 on the 1st, 2nd electrodes 82, 83 by ultrasonic welding.

Then, as shown in FIG. 8, the fuse element 80 is mounted on the soluble conductor 6 so that the flex sheet 5 may cover the soluble conductor 6 completely. Further, as a fixing agent to be temporarily fixed on the soluble conductor 6 , a small amount of the liquid flex 7 is dripped or applied, and the flex sheet 5 is loaded, whereby the flex sheet 5 is fixed on the soluble conductor 6 . do.

Then, the cover member 89 is adhered onto the insulating substrate 81 via the adhesive 84 . The protrusion 89b of the cover member 89 does not interfere with the flex sheet 5 because there is a predetermined clearance with respect to the mounting position of the flex sheet 5 .

[Schematic]

Such a fuse element 80 has a circuit configuration shown in Fig. 10A. The fuse element 80 is mounted on an external circuit via the first and second external connection electrodes 82a and 83a, and is built into the current path of the external circuit. The fuse element 80 is not melted by self-heating while a predetermined rated current flows through the soluble conductor 6 . And in the fuse element 80, when an overcurrent exceeding a rating is energized, the soluble conductor 6 is fused by self-heating and cuts off between the 1st, 2nd electrodes 82, 83, and the said external circuit block the current path of (Fig. 10(B)).

At this time, in the fuse element 80, since the low-melting-point metal layer 3 having a lower melting point than the high-melting-point metal layer 2 of the soluble conductor 6 is laminated as described above, by self-heating due to overcurrent, It begins to erode the refractory metal layer (2). Therefore, the fuse element 80 utilizes the erosion action of the high-melting-point metal layer 2 by the low-melting-point metal layer 3 of the soluble conductor 6, so that the high-melting-point metal layer 2 is melted at a temperature lower than the melting temperature. and can be cut quickly.

In addition, as shown in Fig. 9, the molten metal of the soluble conductor 6 is divided into the left and right by the physical pulling action of the first and second electrodes 82, 83, so quickly and reliably, A current path between the first and second electrodes 82 and 83 may be blocked.

[Manufacturing method]

As the manufacturing method of the fuse element 80, the manufacturing method regarding the fuse element 1 described above can be used. Therefore, description of the manufacturing method regarding the fuse element 1 is abbreviate|omitted.

First, the first and second electrodes 82 and 83 are respectively patterned by screen printing or the like on both ends of the insulating substrate 81 facing each other, and the surface is appropriately subjected to oxidation prevention and electrode erosion. As a countermeasure, the base part is manufactured by forming the protective layer 86 of Sn, Ni/Au, Ni/Pd, Ni/Pd/Au, etc. by plating process.

Next, on the surface 81a side of the insulating substrate 81, a connection material 88 such as solder paste is applied on the first and second electrodes 82, 83, and the first and second electrodes 82, 82, 83 , the fusible conductor 6 part of the fuse element 1 is connected. Thereby, the fuse element 1, ie, the soluble conductor 6, is mounted on the 1st, 2nd electrodes 82, 83.

Next, after applying the adhesive 84 to the surface 81a side of the insulating substrate 81 in a predetermined range, by bonding the cover member 89, the fuse element 1 is covered, and the fuse element 80 is covered. is completed

Here, as for the method of mounting the fuse element 1 in the fuse element 80 , the manufacturing process of the fuse element 1 may be divided and introduced into the manufacturing process of the fuse element 80 .

Specifically, before adhering the flex sheet 5 of the fuse element 1 to the fusible conductor 6, or before applying the flax 9 containing the insulator piece to the surface of the fusible conductor 6, the fusible conductor ( 6) After a single body is mounted on the 1st, 2nd electrodes 82, 83 and connected, the flex sheet 5 is temporarily fixed on the soluble conductor 6 using fixing agents, such as a flex 7 etc. Alternatively, the soluble conductor 6 alone may be mounted on the first and second electrodes 82 and 83 and connected, and then the insulator piece containing flax 9 may be applied. In this case, by heating in the step of adhering the cover member 89 , the adhesive 84 can be cured and the flex sheet 5 can be fixed.

By introducing the manufacturing method of the fuse element 1 to the manufacturing method of the fuse element 80 , there is no need to prepare the fuse element 1 in advance, and the manufacturing process of the fuse element 80 is reduced to the fuse element 1 . Since it can be integrated with the manufacturing process of

In addition, even when the manufacturing method of the fuse element 1 is introduce|transduced into the manufacturing method of the fuse element 80, it is needless to explain that the process of adhering the cover member 89 becomes the last.

[Modification Example 1 of Fuse Element]

Next, the first modification of the fuse element 80 will be described. As the fuse element 80, as shown in Fig. 11A, the flex sheet 5 may be replaced with the flex sheet 85a. In the fuse element 80 shown in FIG. 11A , there is no particular change in portions other than the flex sheet 85a.

The flex sheet 85a is formed by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, impregnated with the flex 7 in a nonwoven fabric or a mesh-shaped base material, or A nonwoven fabric or a mesh-shaped base paper is arrange|positioned on the flax 7 apply|coated to the outermost layer of the soluble conductor 6, and the flax 7 is impregnated. The flex sheet 85a can hold the fluid or semi-fluid flex 7 by the support 8 having liquid retention properties.

When using the structure shown in the modification 1 of the fuse element 80, in the manufacturing method of the fuse element 80 demonstrated above, the soluble conductor 6 single-piece|unit is 1st, 2nd electrodes 82, 83. After being mounted and connected on the soluble conductor 6 , a fluid or semi-fluid flex 7 is applied or dropped, and the sheet-shaped support 8 is mounted on the flax 7 .

Moreover, when using the structure shown by the modification 1 of the fuse element 80, the flex sheet 85a can be mounted also under the soluble conductor 6 as shown to FIG.11(B). In addition, it goes without saying that you may make it mount the flex sheet 85a only under the soluble conductor 6 .

[Modified Example 2 of Fuse Element]

Next, a modified example of the fuse element 80 will be described. As the fuse element 80, as shown in FIG. In the fuse element 80 shown in Fig. 12A, there is no particular change in portions other than the insulator piece-containing flax 85b.

The insulator piece-containing flax 85b does not impregnate the sheet-shaped support 8 with the fluid or semi-fluid flex 7, and the fluid or semi-fluid flex 7 has a needle-shaped or short-fiber insulator piece 10. It is kneaded and contained, and it apply|coated to the soluble conductor (6). The insulator piece-containing flex 85b can hold the fluid or semi-fluid flex 7 on the soluble conductor 6 by the insulator piece 10 having liquid retention properties.

When using the structure shown by the modification 2 of the fuse element 80, in the manufacturing method of the fuse element 80 mentioned above WHEREIN: The soluble conductor 6 single-piece|unit is formed on the 1st, 2nd electrodes 82, 83. It can manufacture by apply|coating on the soluble conductor 6 the insulator piece containing flax 9 which knead|mixed and contained the insulator piece 10 of needle shape or a short fiber after being mounted and connected.

In addition, when using the structure shown in the modification 2 of the fuse element 80, as shown in FIG.12(B), the insulator piece containing flax 85b can be apply|coated also under the soluble conductor 6 . It goes without saying that the insulator piece containing flax 85b may be applied only under the soluble conductor 6 .

[Protection element (blocking heat by heating element and blocking self-heating)]

Then, the protection element using the fuse element 1 is demonstrated. In addition, in the following description, about the member similar to the above-mentioned fuse element 1 and the fuse element 80, the same code|symbol is attached|subjected and the detail is abbreviate|omitted.

The protection element 90 to which this invention is applied is laminated|stacked on the insulating substrate 91 and the insulating substrate 91, as shown to FIG.13(A), FIG.14(A), The insulating member 92 ) covered with the heating element 93, the first electrodes 94 and second electrodes 95 formed on both ends of the insulating substrate 91, and the heating element 93 on the insulating substrate 91 are laminated to overlap, A heating element lead-out electrode 96 electrically connected to the heating element 93, both ends of the fuse element 1 are connected to the first and second electrodes 94 and 95, respectively, and the center part is connected to the heating element extraction electrode 96 ) and a cover member 97 that covers the fuse element 1 on the insulating substrate 91 . The fuse element 1 is comprised by the soluble conductor 6 and the flex sheet 5 mounted on the soluble conductor 6 and/or under the soluble conductor 6 . In addition, about the flex sheet 5 mounted under the soluble conductor 6, it shows in FIG.13(B).

The insulating substrate 91 is formed in a rectangular shape by an insulating member such as alumina, glass ceramics, mullite, or zirconia, similarly to the insulating substrate 81 . In addition, for the insulating board|substrate 91, you may use the material used for printed wiring boards, such as a glass epoxy board|substrate and a phenol board|substrate.

First and second electrodes 94 and 95 are formed at opposite ends of the insulating substrate 91 . The first and second electrodes 94 and 95 are each formed of a conductive pattern such as Ag or Cu wiring. In addition, the first and second electrodes 94 and 95 are first and second external connection electrodes 94a and 95a formed from the front surface 91a of the insulating substrate 91 to the back surface 91b through casting. ) and is continuous. The protection element 90 is formed on the circuit board by connecting the first and second external connection electrodes 94b and 95b formed on the back surface 91b to the connection electrodes provided on the circuit board on which the protection element 90 is mounted. part of the current path.

The heating element 93 is a conductive member that generates heat when energized, and includes, for example, nichrome, W, Mo, Ru, or the like, or a material containing these. The heating element 93 is obtained by mixing these alloys, compositions, or powders of the compound with a resin binder or the like to form a paste, and forming a pattern on the insulating substrate 91 using a screen printing technique, then baking. can be formed

In the protection element 90 , the heating element 93 is covered with the insulating member 92 , and the heating element lead-out electrode 96 is formed so as to face the heating element 93 through the insulating member 92 . The fusible conductor 6 of the fuse element 1 is connected to the heating-element extraction electrode 96, and the heating element 93 by this is connected with the fusible conductor 6 through the insulating member 92 and the heating-element extraction electrode 96. overlapped The insulating member 92 is provided in order to transmit the heat|fever of the heat generating body 93 efficiently to the soluble conductor 6 while aiming at the protection and insulation of the heat generating body 93, for example, a glass layer is included.

Note that the heat generating element 93 may be formed inside the insulating member 92 laminated on the insulating substrate 91 . In addition, the heating element 93 may be formed on the back surface 91b opposite to the surface on which the first and second electrodes 94 and 95 of the insulated substrate 91 are formed, or the surface ( 91a) adjacent to the first and second electrodes 94 and 95 may be formed. In addition, the heat generating element 93 may be formed inside the insulating substrate 91 .

In addition, the heating element 93 has one end connected to the heating element extraction electrode 96 and the other end connected to the heating element electrode 99 . The heating element extraction electrode 96 is formed on the surface 91a of the insulating substrate 91 and is connected to the heating element 93 and a lower layer portion 96a connected to the heating element 93 on the insulating member 92 opposite to the heating element 93 . It has an upper layer portion 96b that is laminated and connected with the fusible conductor 6 of the fuse element 1 . Thereby, the heat generating body 93 is electrically connected with the soluble conductor 6 of the fuse element 1 via the heat generating body lead-out electrode 96. As shown in FIG. Moreover, the heat generating body extraction electrode 96 can make it easy to aggregate while fusing the soluble conductor 6 by opposingly arrange|positioning to the heat generating body 93 via the insulating member 92.

In addition, the heating element electrode 99 is formed on the front surface 91a of the insulating substrate 91 and is continuous with the heating element feeding electrode 99a formed on the back surface 91b of the insulating substrate 91 through casting. have.

As for the protection element 90, the soluble conductor 6 of the fuse element 1 is connected from the 1st electrode 94 via the heat generating body extraction electrode 96 through the 2nd electrode 95. The soluble conductor 6 is mounted on the first and second electrodes 94 and 95 and the heating element lead-out electrode 96 via a connection material 100 such as solder, and then can be easily connected by reflow soldering or the like. have.

As described above, since the fuse element 1 has improved resistance to a high-temperature environment because the soluble conductor 6 includes the high-melting-point metal layer 2, it is excellent in mountability, and the connection material 100 is After being mounted on the first and second electrodes 94 and 95 and the heating element lead-out electrode 96, they can be easily connected by reflow soldering or the like.

In addition, the first and second electrodes 94 and 95, the heating element lead-out electrode 96 and the heating element electrode 99 are formed, for example, by a conductive pattern such as Ag or Cu, suitably Sn plating on the surface, A protective layer 98 such as Ni/Au plating, Ni/Pd plating, and Ni/Pd/Au plating is formed. Thereby, while preventing oxidation of the surface, the 1st, 2nd electrode ( 94, 95) and the erosion of the heating element lead-out electrode 96 can be suppressed.

In addition, the first and second electrodes 94 and 95 contain an insulating material such as glass that prevents outflow of the molten conductor of the soluble conductor 6 or the connection material 100 of the fuse element 1 described above. A leak prevention part 102 is formed.

Moreover, the protection element 90 comprises a part of the electricity supply path|route to the heat generating body 93 by the soluble conductor 6 being connected with the heat generating body extraction electrode 96. As shown in FIG. Therefore, in the protection element 90, when the soluble conductor 6 melts and the connection with an external circuit is interrupted|blocked, since the electricity supply path|route to the heat generating body 93 is also interrupted|blocked, heat_generation|fever can be stopped.

[Flex Sheet]

In addition, the protection element 90 is used to prevent oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3, to remove oxides during fusion cutting, and to improve the fluidity of the solder, as shown in FIG. 14A. Similarly, the flex sheet 5 is mounted on the entire surface of the outermost layer on the soluble conductor 6 . The flex sheet 5 is obtained by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, impregnated with the flex 7 in a nonwoven fabric or mesh-shaped base material.

It is preferable that the flex sheet 5 has an area larger than the surface area of the soluble conductor 6 . Thereby, even when the soluble conductor 6 is completely covered with the flex sheet 5 and the volume expands due to melting, the soluble conductor 6 reliably removes oxides by the flex 7 and the rapid melting by improvement of wettability is prevented. can be realized

By arranging the flex sheet 5, the flex 7 can be maintained over the entire surface of the soluble conductor 6 even in the heat treatment process at the time of mounting the fuse element 1 or the mounting of the protection element 90, In actual use of the protection element 90, the wettability of the low-melting-point metal layer 3 (for example, solder) is improved, and oxides while the first and second low-melting-point metals are dissolved are removed, The erosive action on refractory metals (eg Ag) can be used to improve fast melting.

In addition, by disposing the flex sheet 5, even when an antioxidant film such as Pb-free solder containing Sn as a main component is formed on the surface of the high-melting-point metal layer 2 of the outermost layer, the oxide of the antioxidant film can be removed. It is possible to effectively prevent oxidation of the high-melting-point metal layer 2, and to maintain and improve fast-melting properties.

Moreover, as shown to FIG.13(B), the flex sheet 5 can be mounted also under the soluble conductor 6 . In addition, it goes without saying that the flex sheet 5 may be mounted only under the soluble conductor 6 .

[No cover]

The fuse element 90 has a cover member 97 that protects the inside and prevents scattering of the fuse element 1 on the surface 91a of the insulating substrate 91 on which the fuse element 1 is provided. is installed

The cover member 97 can be formed of a member having insulating properties, such as various engineering plastics and ceramics. In the fuse element 90 , since the fuse element 1 is covered by the cover member 97 , the molten metal adheres to the cover member 97 even during self-heating interruption accompanying generation of arc discharge due to overcurrent. It is captured by the scattering of the surrounding, and can be prevented.

Further, the cover member 97 has a projection 97b extending from the ceiling surface 97a toward the insulating substrate 81 to at least the side surface of the flex sheet 5 . As for the cover member 97, since the side surface of the flex sheet 5 is restricted from movement by the protrusion 97b, it is possible to prevent the flex sheet 5 from being misaligned. That is, the projection 97b has a size that maintains a predetermined clearance rather than the size of the flex sheet 5 , and is provided corresponding to a position where the flex sheet 5 is to be held. In addition, the protrusion part 97b is good also as a wall surface which goes around and covers the side surface of the flex sheet 5, and may protrude partially.

In addition, the cover member 97 has a structure in which a predetermined interval is provided between the flex sheet 5 and the ceiling surface 97a. As shown in FIG. 15, when the soluble conductor 6 melts, it is because the clearance for the melted conductor to push up the flex sheet 5 is needed.

Therefore, in the cover member 97 , the height of the inner space of the cover member 97 (the height to the ceiling surface 97a ) is the height of the molten conductor 6 on the surface 91a of the insulating substrate 91 . It is comprised so that it may become larger than the sum of the height (when divided into several molten conductors, the highest height among the molten conductors) and the thickness of the flex sheet 5. As shown in FIG.

[Mount state]

Then, the mounting state of the fuse element 1 is demonstrated. As for the fuse element 90, as shown to FIG.13(A) and FIG.15, the soluble conductor 6 is spaced apart from the surface 91a of the insulated substrate 91, and is mounted.

On the other hand, in the fuse element in which a soluble conductor is in contact with the surface of an insulating substrate, such as forming a soluble conductor on the surface of an insulating substrate by printing, between 1st, 2nd electrodes, the molten metal of a soluble conductor adheres on an insulating substrate. and leakage occurs. For example, in a fuse element in which a soluble conductor is formed by printing Ag paste on a ceramic substrate, ceramic and Ag are sintered to permeate and remain between the first and second electrodes. Therefore, a leakage current flows between the first and second electrodes due to the residue, and the current path cannot be completely blocked.

In this point, in the fuse element 90, the soluble conductor 6 is formed separately from the insulating board|substrate 91, and it is further spaced apart from the surface 91a of the insulated board|substrate 91, and is mounted. Accordingly, the fuse element 90 is formed on the first and second electrodes 94 and 95 and the heating element extraction electrode 96 without molten metal permeating into the insulating substrate 91 even when the soluble conductor 6 is melted. It is inserted so that it is possible to reliably insulate between the first and second electrodes 94 and 95 .

In addition, although the fuse element 1 can connect the soluble conductor 6 on the 1st, 2nd electrodes 94 and 95, and the heat generating body extraction electrode 96 by reflow soldering as mentioned above, in addition , the fuse element 1 may connect the soluble conductor 6 on the 1st, 2nd electrodes 94 and 95, and the heat generating body extraction electrode 96 by ultrasonic welding.

Next, the mounting state of the flex sheet 5 is demonstrated. The fuse element 90 is mounted on the soluble conductor 6 so that the flex sheet 5 may completely cover the soluble conductor 6, as shown to FIG.13(A). Further, as a fixing agent to be temporarily fixed on the soluble conductor 6 , a small amount of the liquid flex 7 is dripped or applied, and the flex sheet 5 is loaded, whereby the flex sheet 5 is fixed on the soluble conductor 6 . do.

Subsequently, the cover member 97 is adhered onto the insulating substrate 91 via the adhesive 103 . The protrusion 97b of the cover member 97 does not interfere with the flex sheet 5 because there is a predetermined clearance with respect to the mounting position of the flex sheet 5 .

[Circuit diagram and fusing process]

The protection element 90 to which this invention was applied has a circuit structure as shown in FIG.14(B). That is, the protection element 90 has the connection point of the soluble conductor 6 and the soluble conductor 6 which were connected in series between the 1st, 2nd external connection terminals 94a, 95a via the heat generating body lead-out electrode 96. It is a circuit structure containing the heat generating body 93 which melts the soluble conductor 6 by making it heat-generate through the heat generating body extraction electrode 96 used as electricity. And, in the protection element 90, the first and second electrodes 94 and 95 and the heating element electrode 99 are respectively connected to the first and second external connection terminals 94a and 95a and the heating element feeding terminal 99a. connected to an external circuit board. Thereby, in the protection element 90, the soluble conductor 6 of the fuse element 1 is serially connected on the current path of an external circuit via the 1st, 2nd electrodes 94, 95, and the heating element 93 is connected in series. It is connected to a current control element provided in an external circuit through the provisional heating element electrode 99 .

In the protection element 90 having such a circuit configuration, when it is necessary to cut off the current path of the external circuit, the heating element 93 is energized by the current control element provided in the external circuit. Thereby, as for the protection element 90, the soluble conductor 6 built-in on the current path of an external circuit is melt|melted by the heat_generation|fever of the heat generating body 93, and FIG. 16(A) and FIG. 16(B) As shown in the figure, the soluble conductor 6 is cut by fusion when the molten conductor of the soluble conductor 6 is drawn by the high wettability heating-element extraction electrode 96 and the 1st, 2nd electrodes 94 and 95. Thereby, the fuse element 1 reliably cuts the gap between the first electrode 94 and the heating element lead-out electrode 96 to the second electrode 95 (FIG. 16(B)), and the current of the external circuit path can be blocked. Moreover, when the soluble conductor 6 is cut by melting, electric power feeding to the heat generating body 93 is also stopped.

At this time, in the fuse element 1, since the low-melting-point metal layer 3 having a lower melting point than the high-melting-point metal layer 2 of the soluble conductor 6 is laminated as described above, by self-heating due to overcurrent, It begins to erode the refractory metal layer (2). Therefore, the fuse element 1 utilizes the erosion action of the high-melting-point metal layer 2 by the low-melting-point metal layer 3 of the soluble conductor 6, whereby the high-melting-point metal layer 2 is melted at a temperature lower than the melting temperature. and can be cut quickly.

[Manufacturing method]

As the manufacturing method of the protection element 90 , the manufacturing method related to the fuse element 1 and the manufacturing method related to the fuse element 80 described above can be used. In addition, below, as a manufacturing method of the protection element 90, only the part which mounts the fuse element 1 on the insulating substrate 91 is demonstrated, and detailed description of another process is abbreviate|omitted.

First, on the surface 91a side of the insulating substrate 91, a connection material 100 such as solder paste is applied on the first and second electrodes 94 and 95 and the heating element lead-out electrode 96, and the first , The soluble conductor 6 portion of the fuse element 1 is connected across the second electrodes 94 and 95 and the heating element lead-out electrode 96 . Thereby, the fuse element 1, ie, the soluble conductor 6, is mounted on the 1st, 2nd electrodes 94 and 95, and the heat generating body extraction electrode 96. As shown in FIG.

Next, after applying the adhesive 103 to the side of the surface 91a of the insulating substrate 91 in a predetermined range, the cover member 97 is adhered to cover the fuse element 1 and thus the protection element 90 . is completed

Here, about the mounting method of the fuse element 1 in the protection element 90, you may make it introduce|transduce the manufacturing process of the fuse element 1 in division|segmentation inside the manufacturing process of the protection element 90.

Specifically, before adhering the flex sheet 5 of the fuse element 1 to the fusible conductor 6, or before applying the flax 9 containing the insulator piece to the surface of the fusible conductor 6, the fusible conductor ( 6) After attaching and connecting a single body on the 1st, 2nd electrodes 94 and 95 and the heat generating body lead-out electrode 96, the flex sheet 5 is attached to the soluble conductor 6 on the flex 7 etc. Adhesion is performed using a fixing agent to be temporarily fixed, or the soluble conductor 6 alone is mounted on the first and second electrodes 82 and 83 and connected, and then the insulator piece-containing plex 9 is applied. You can do it.

By introducing the manufacturing method of the protection element 90 to the manufacturing method of the fuse element 1, it is unnecessary to manufacture the fuse element 1 in advance, and the manufacturing process of the fuse element 1 is simplified by the protection element 90. Since it can be integrated with the manufacturing process of

In addition, even when the manufacturing method of the fuse element 1 is introduce|transduced into the inside of the manufacturing method of the protection element 90, it is needless to explain that the process of adhering the cover member 97 becomes the last.

[Modification Example 1 of Protection Element]

Next, the first modification of the protection element 90 will be described. As the protection element 90, as shown in FIG. 17A, you may make it use what replaced the flex sheet 5 with the flex sheet 104a. It is assumed that there is no special change in the protection element 90 shown in FIG. 17A except for the flex sheet 104a.

The flex sheet 104a is formed by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, a non-woven fabric or a mesh-shaped base material impregnated with the flex 7, or A nonwoven fabric or a mesh-shaped base paper is arranged on the flax 7 applied to the outermost layer of the soluble conductor 6, and the flax 7 is impregnated. The flex sheet 104a can hold the fluid or semi-fluid flex 7 by the support 8 having liquid retention properties.

When using the structure shown in the modification 1 of the protection element 90, in the manufacturing method of the protection element 90 mentioned above, the soluble conductor 6 single-piece|unit is 1st, 2nd electrodes 94, 95, After being mounted and connected on the heating element extraction electrode 96, a fluid or semi-fluid flex 7 is applied or dropped on the soluble conductor 6, and a sheet-shaped support 8 is loaded on the flax 7 It can be manufactured by

Moreover, when using the structure shown by the modification 1 of the protection element 90, the flex sheet 104a can be mounted also under the soluble conductor 6 as shown to FIG.17(B). In addition, it goes without saying that the flex sheet 104a may be mounted only under the soluble conductor 6 .

[Modification Example 2 of Protection Element]

Next, the second modification of the protection element 90 will be described. As the protection element 90, as shown in FIG. 18A, the flex sheet 5 may be replaced with the insulator piece-containing flex 104b. In the protection element 90 shown in FIG. 18A, there is no particular change in portions other than the insulator piece containing flax 104b.

The insulator piece-containing flex 104b does not impregnate the sheet-shaped support 8 with the fluid or semi-fluid plex 7, and the fluid or semi-fluid flex 7 has a needle-shaped or short-fiber insulator piece 10. was kneaded and contained, applied to the soluble conductor 6 and dried. The insulator piece-containing flex 104b can hold the fluid or semi-fluid flex 7 on the soluble conductor 6 by the insulator piece 10 having liquid retention properties.

When using the structure shown in the modification 2 of the protection element 90, in the manufacturing method of the protection element 90 mentioned above, the soluble conductor 6 single-piece|unit is 1st, 2nd electrodes 94, 95, After being mounted on the heat generating element lead-out electrode 96, it can manufacture by apply|coating on the soluble conductor 6 the insulator piece containing flax 104b which kneaded and contained the insulator piece 10 of needle shape or a short fiber.

In addition, when using the structure shown in the modification 2 of the protection element 90, as shown in FIG.18(B), the insulator piece containing flax 104b can be apply|coated also under the soluble conductor 6 . It goes without saying that the insulator piece containing flax 104b may be applied only under the soluble conductor 6 .

[Modified example 3 of the protection element]

In addition, the protection element 90 does not necessarily need to coat|cover the heating element 93 with the insulating member 92, and the heating element 93 may be provided in the inside of the insulating substrate 91. As shown in FIG. By using a material having excellent thermal conductivity as the material of the insulating substrate 91 , the heating element 93 can be heated in the same manner as in the case of passing through the insulating member 92 such as a glass layer.

[Modification Example 4 of Protection Element]

Further, in the protection element 90 , in addition to forming the heating element 93 on the front surface 91a side of the insulating substrate 91 as described above, the heating element 93 is provided on the back surface 91b of the insulating substrate 91 . It may be installed on the side. By forming the heating element 93 on the back surface 91b of the insulated substrate 91 , it can be formed in a simpler process than forming in the insulated substrate 91 . Further, in this case, if the insulating member 92 is formed on the heating element 93, it is preferable in the sense of protecting the resistor or securing insulation during mounting.

[Short-circuit element (heating short circuit by heating element)]

Then, the short circuiting element using the fuse element 1 is demonstrated. Fig. 19 shows a plan view of the short-circuiting element 110, and Fig. 20(A) shows a cross-sectional view of the short-circuiting element 110. As shown in Figs. The short circuiting element 110 includes an insulating substrate 111 , a heating element 112 provided on the insulating substrate 111 , and a first electrode 113 and a second electrode 114 provided adjacent to each other on the insulating substrate 111 . ) and the third electrode 115 electrically connected to the heating element 112 while being provided adjacent to the first electrode 113 , and the first and third electrodes 113 and 115 , thereby providing a current A path is formed and the current path between the first and third electrodes 113 and 115 is fused by heating from the heating element 112, and the first and second electrodes 113 and 114 are passed through the molten conductor. A fuse element (1) for short-circuiting is provided, and a cover member (116) for covering the fuse element (1) on an insulating substrate (91). The fuse element 1 is comprised by the soluble conductor 6 and the flex sheet 5 mounted on the soluble conductor 6 and/or under the soluble conductor 6 . In addition, about the flex sheet 5 mounted under the soluble conductor 6, it shows in FIG.20(B).

The insulating substrate 111 is formed in a substantially rectangular shape using, for example, an insulating member such as alumina, glass ceramics, mullite, or zirconia. In addition, the insulating substrate 111 may use the material used for printed wiring boards, such as a glass epoxy board|substrate and a phenol board|substrate, However, It is necessary to pay attention to the temperature at the time of fuse fusing.

The heating element 112 is covered by the insulating member 118 on the insulating substrate 111 . In addition, first to third electrodes 113 to 115 are formed on the insulating member 118 . The insulating member 118 is provided in order to efficiently transfer the heat of the heating element 112 to the first to third electrodes 113 to 115 , and includes, for example, a glass layer. The heating element 112 can make it easy to aggregate a molten conductor by heating the 1st thru|or 3rd electrodes 113-115.

The first to third electrodes 113 to 115 are formed of a conductive pattern such as Ag or Cu wiring. The first electrode 113 is formed adjacent to the second electrode 114 on one side and is insulated. A third electrode 115 is formed on the other side of the first electrode 113 . The 1st electrode 113 and the 3rd electrode 115 are electrically connected when the soluble conductor 6 of the fuse element 1 is connected, and comprises the current path|route of the short circuiting element 110. As shown in FIG. Further, the first electrode 113 is connected to a first external connection terminal 113a provided on the back surface 111b of the insulating substrate 111 through a caster that faces the side surface of the insulating substrate 111 . Further, the second electrode 114 is connected to a second external connection terminal 114a provided on the back surface 111b of the insulating substrate 111 through a caster that faces the side surface of the insulating substrate 111 .

Further, the third electrode 115 is connected to the heating element 112 through the heating element extraction electrode 120 provided on the insulating substrate 111 or the insulating member 118 . In addition, the heating element 112 includes a heating element feeding terminal 121a provided on the back surface 111b of the insulated substrate 111 through a caster facing the side edge of the heating element electrode 121 and the insulating substrate 111 and connected.

As for the 1st and 3rd electrodes 113 and 115, the soluble conductor 6 of the fuse element 1 is connected via the connection material 117, such as solder. As described above, since the fuse element 1 has improved resistance to a high-temperature environment because the soluble conductor 6 includes the high-melting-point metal layer 2, it is excellent in mountability and the connection material 117 is used. After being mounted between the first and third electrodes 113 and 115 through the connection, it can be easily connected by reflow soldering or the like. In addition, the fuse element 1 may use the low melting-point metal layer 3 provided in the lowest layer of the soluble conductor 6 as a connection material, and may connect it to the 1st, 3rd electrodes 113 and 115.

In addition, although the 1st to 3rd electrodes 113, 114, 115 can be formed using general electrode materials, such as Cu and Ag, at least on the surface of the 1st, 2nd electrodes 113, 114, Ni It is preferable that the protective layer 129, such as /Au plating, Ni/Pd plating, and Ni/Pd/Au plating, is formed by a well-known plating process. Thereby, oxidation of the 1st, 2nd electrodes 113 and 114 can be prevented, and a molten conductor can be hold|maintained reliably. In addition, when reflow-mounting the short circuiting element 110, the solder which connects the fusible conductor 6 of the fuse element 1, or the 1st which forms the outer layer of the fusible conductor 6 of the fuse element 1, or When the second low-melting-point metal layers 3 and 4 are melted, it is possible to prevent erosion (solder erosion) of the first electrode 113 .

In addition, the first to third electrodes 113 to 115 include an insulating material such as glass that prevents the outflow of the molten conductor of the soluble conductor 6 or the connection material 117 of the fuse element 1 described above. A leak prevention part 126 is formed.

[Flex Sheet]

In addition, the short circuiting element 110 is a soluble conductor as shown in Fig. 19 to prevent oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3, and to remove oxides at the time of melting and improve the fluidity of the solder. (6) The flex sheet 5 is mounted on the entire surface of the uppermost layer. The flex sheet 5 is obtained by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, impregnated with the flex 7 in a nonwoven fabric or mesh-shaped base material.

It is preferable that the flex sheet 5 has an area larger than the surface area of the soluble conductor 6 . Thereby, even when the soluble conductor 6 is completely covered with the flex sheet 5 and the volume expands due to melting, the soluble conductor 6 reliably removes oxides by the flex 7 and the rapid melting by improvement of wettability is prevented. can be realized

By disposing the flex sheet 5, the flex 7 can be maintained over the entire surface of the soluble conductor 6 even in the heat treatment process at the time of mounting the fuse element 1 or the mounting of the short circuit element 110, In actual use of the short-circuiting element 110, the wettability of the low-melting-point metal layer 3 (eg, solder) is improved, and oxides while the low-melting-point metal is dissolved are removed, and the high-melting-point metal (eg, solder) is removed. For example, the erosion action on Ag) can be used to improve the fast melting properties.

Moreover, even when an antioxidant film, such as Pb-free solder which has Sn as a main component, is formed on the surface of the high melting-point metal layer 2 of the outermost layer of the soluble conductor 6 by arranging the flex sheet 5, the said oxidation The oxide of the barrier film can be removed, the oxidation of the high-melting-point metal layer 2 can be effectively prevented, and the rapid melting property can be maintained and improved.

Moreover, as shown to FIG.20(B), the flex sheet 5 can be mounted also under the soluble conductor 6 . In addition, it goes without saying that the flex sheet 5 may be mounted only under the soluble conductor 6 .

[No cover]

The short circuiting element 110 is on the surface 111a of the insulating substrate 111 on which the fuse element 1 is provided, a cover member 116 that protects the inside and prevents scattering of the molten fuse element 1 . is installed

The cover member 116 can be formed of a member having insulating properties, such as various engineering plastics and ceramics. In the short circuiting element 110 , since the fuse element 1 is covered by the cover member 116 , the molten metal adheres to the cover member 116 even during self-heating interruption accompanying generation of arc discharge due to overcurrent. It is captured by the scattering of the surrounding, and can be prevented.

Further, the cover member 116 has a projection 116b extending from the ceiling surface 116a toward the insulating substrate 111 to at least the side surface of the flex sheet 5 . As for the cover member 116, since the side surface of the flex sheet 5 is restricted from movement by the protrusion 116b, it is possible to prevent the flex sheet 5 from being misaligned. That is, the projection 116b has a size that maintains a predetermined clearance rather than the size of the flex sheet 5 , and is provided corresponding to a position where the flex sheet 5 is to be held. In addition, the protrusion part 116b may be a wall surface which goes around and covers the side surface of the flex sheet 5, and may protrude partially.

In addition, the cover member 116 has a structure in which a predetermined interval is provided between the flex sheet 5 and the ceiling surface 116a. As shown in FIG. 21, when the soluble conductor 6 melts, it is because the clearance for the melted conductor to push up the flex sheet 5 is needed.

Therefore, in the cover member 116 , the height of the inner space of the cover member 116 (the height to the ceiling surface 116a ) is the molten conductor 6 on the surface 111a of the insulating substrate 111 . It is comprised so that it may become larger than the sum of the height (when divided into several molten conductors, the highest height among the molten conductors) and the thickness of the flex sheet 5. As shown in FIG.

[Circuit of short-circuit element]

The short circuiting element 110 as described above has a circuit configuration as shown in Figs. 22A and 22B. That is, as for the short circuiting element 110, the 1st electrode 113 and the 2nd electrode 114 are insulated at the time of normal (FIG. 22(A)), and the soluble conductor 6 by the heat_generation|fever of the heat generating body 112. When ) melts, the switch 123 short-circuited through the molten conductor is constituted (FIG. 22(B)). The first external connection terminal 113a and the second external connection terminal 114a constitute both terminals of the switch 123 . Moreover, the soluble conductor 6 is connected with the heat generating body 112 via the 3rd electrode 115 and the heat generating body extraction electrode 120. As shown in FIG.

Then, the short circuiting element 110 is incorporated in an electronic device or the like, so that both terminals 113a and 114a of the switch 123 are connected to the current path of the electronic device to conduct the current path, the switch ( 123) to form a current path of the electronic component.

For example, in the short circuiting element 110 , the electronic component installed on the current path of the electronic component and both terminals 113a and 114a of the switch 123 are connected in parallel, and an abnormality occurs in the parallel-connected electronic component. On the other hand, electric power is supplied between the heating element power supply terminal 121a and the first external connection terminal 113a, and the heating element 112 is energized to generate heat. When the soluble conductor 6 melts by this heat|fever, as shown in FIG. 21, a molten conductor will aggregate on the 1st, 2nd electrodes 113 and 114. Since the first and second electrodes 113 and 114 are formed adjacent to each other, the molten conductor aggregated on the first and second electrodes 113 and 114 is coupled, whereby the first and second electrodes 113 are combined. , 114) is short-circuited. That is, the short circuiting element 110 forms a bypass current path that bypasses the electronic component causing the abnormality when both terminals of the switch 123 are short-circuited (FIG. 22B). Moreover, since between the 1st, 3rd electrodes 113 and 115 is cut by melting by cutting the soluble conductor 6 by melting, electric power feeding to the heat generating body 112 is also stopped.

[Manufacturing method]

As the manufacturing method of the short circuiting element 110 , the manufacturing method relating to the fuse element 1 and the manufacturing method relating to the fuse element 80 and the protection element 90 described above can be used. In addition, below, as a manufacturing method of the short circuiting element 110, only the part which mounts the fuse element 1 on the insulating substrate 111 is demonstrated, and detailed description of other processes is abbreviate|omitted.

First, on the surface 111a side of the insulating substrate 111, a connection material 117 such as solder paste is applied on the first and third electrodes 113 and 115, and the first and third electrodes 113, The soluble conductor 6 portion of the fuse element 1 is connected between 115 . Thereby, the soluble conductor 6 of the fuse element 1 is mounted on the 1st, 3rd electrodes 113,115.

Then, after applying the adhesive 128 to the surface 111a side of the insulating substrate 111 in a predetermined range, the cover member 116 is adhered with the adhesive 128, so that the fuse element 1 is covered. , the shorting element 110 is completed. The protrusion 116b of the cover member 116 does not interfere with the flex sheet 5 because there is a predetermined clearance with respect to the mounting position of the flex sheet 5 .

Here, regarding the method of mounting the fuse element 1 in the short circuiting element 110 , the manufacturing process of the fuse element 1 may be divided and introduced into the manufacturing process of the shorting element 110 .

Before adhering the flex sheet 5 of the fuse element 1 to the soluble conductor 6 specifically, the soluble conductor 6 single-piece|unit is mounted on the 1st, 3rd electrodes 113,115, and it connects And you may make it adhere|attach the flex sheet 5 on the soluble conductor 6 using fixing agents for temporary fixation, such as the flex 7,. As another example, the soluble conductor 6 single-piece|unit is mounted on the 1st, 3rd electrodes 113, 115, so that it connects, apply|coats the insulator piece containing flax 9 on the soluble conductor 6, and is dried You can do it. Moreover, as another example, the soluble conductor 6 single-piece|unit is mounted and connected on the 1st, 3rd electrodes 113,115, and the flax 7 is dripped or apply|coated on the soluble conductor 6, and the flax 7 ) before drying, a support 8 having liquid retention properties is placed on the flex 7 to absorb the flex 7, and then the flex 7 may be dried.

By introducing the manufacturing method of the short circuiting element 110 to the manufacturing method of the fuse element 1, there is no need to prepare the fuse element 1 in advance, and the manufacturing process of the fuse element 1 is reduced to the short circuiting element 110 . Since it can be integrated with the manufacturing process of

In addition, even when the manufacturing method of the fuse element 1 is introduce|transduced inside the manufacturing method of the short circuiting element 110, it is needless to explain that the process of adhering the cover member 116 becomes the last.

[Modification Example 1 of Short-Circuit Element]

Next, the first modification of the shorting element 110 will be described. As the short circuiting element 110, as shown in FIG. 23A, the flex sheet 5 may be replaced with the flex sheet 119a. In the short circuiting element 110 shown in FIG. 23A, there is no particular change in portions other than the flex sheet 119a.

The flex sheet 119a is formed by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, a non-woven fabric or a mesh-shaped base material impregnated with the flex 7, or A nonwoven fabric or a mesh-shaped base paper is arranged on the flax 7 applied to the outermost layer of the soluble conductor 6, and the flax 7 is impregnated. The flex sheet 119a can hold the fluid or semi-fluid flex 7 by the support 8 having liquid retention properties.

When using the structure shown in the modification 1 of the short circuiting element 110, in the manufacturing method of the short circuiting element 110 mentioned above, the soluble conductor 6 single-piece|unit is formed on the 1st, 3rd electrodes 113 and 115. After being mounted and connected to the soluble conductor 6, a fluid or semi-fluid flex 7 is applied or dropped, and the sheet-shaped support 8 is mounted on the flax 7 to manufacture it.

Moreover, as shown to FIG.23(B), the flex sheet 119a can be mounted also under the soluble conductor 6 . In addition, it goes without saying that the flex sheet 119a may be mounted only under the soluble conductor 6 .

[Modified example 2 of short-circuit element]

Next, the second modification of the short-circuiting element 110 will be described. As the short-circuiting element 110, as shown in FIG. 24A, the flex sheet 5 may be replaced with the insulator piece-containing flex 119b. In the short circuiting element 110 shown in Fig. 24A, there is no particular change in portions other than the insulator piece containing flax 119b.

The insulator piece-containing flex 119b does not impregnate the sheet-shaped support 8 with the fluid or semi-fluid flex 7, and the fluid or semi-fluid flex 7 has a needle-shaped or short-fiber insulator piece 10. It is made to knead|mix, and it apply|coated to the soluble conductor (6). The insulator piece-containing flex 119b can hold the fluid or semi-fluid flex 7 on the soluble conductor 6 by the insulator piece 10 having liquid retention properties.

When using the structure shown in the modification 2 of the short circuiting element 110, in the manufacturing method of the above-mentioned short circuiting element 110 WHEREIN: The soluble conductor 6 single-piece|unit is formed on the 1st, 3rd electrodes 113 and 115. It can be manufactured by coating the soluble conductor 6 with the insulator piece containing flax 119b which knead|mixed and contained the insulator piece 10 of needle shape or a short fiber after mounting in the soluble conductor 6 .

Moreover, as shown in FIG.24(B), the insulator piece containing flax 119b can be apply|coated under the soluble conductor 6 also. It goes without saying that the insulator piece containing flax 119b may be applied only under the soluble conductor 6 .

[Modified example 3 of short-circuit element]

In the short circuiting element 110 , the heating element 112 is not necessarily covered with the insulating member 118 , and the heating element 112 may be provided inside the insulating substrate 111 . By using a material having excellent thermal conductivity as the material of the insulating substrate 111 , the heating element 112 can be heated in the same manner as in the case of passing through the insulating member 118 such as a glass layer.

[Modified example 4 of short-circuit element]

In addition, in the short circuiting element 110 , in addition to forming the heating element 112 on the side of the formation surface of the first to third electrodes 113 to 115 on the insulating substrate 111 as described above, the heating element 112 is insulated. It may be provided on the surface opposite to the formation surface of the first to third electrodes 113 to 115 of the substrate 111 . By forming the heating element 112 on the back surface 111b of the insulated substrate 111 , it can be formed in a simpler process than forming in the insulated substrate 111 . In this case, if the insulating member 118 is formed on the heating element 112 , it is preferable in the sense of protecting the resistor or securing insulation during mounting.

[Modified example 5 of short-circuit element]

In addition, in the short circuiting element 110 , the heating element 112 is provided on the formation surface of the first to third electrodes 113 to 115 of the insulating substrate 111 , and the first to third electrodes 113 to 115 are provided. ) may be added. By forming the heating element 112 on the surface of the insulating substrate 111 , it can be formed in a simpler process than forming in the insulating substrate 111 . Also in this case, it is preferable that the insulating member 118 is formed on the heating element 112 .

[Variation example 6 of short-circuit element]

In addition, as shown in FIGS. 25 and 26 (A), the short circuiting element 110 has a fourth electrode 124 adjacent to the second electrode 114 and second and fourth electrodes 114 and 124 . ) You may form the 2nd soluble conductor 6b mounted between. The 2nd soluble conductor 6b has the structure similar to the soluble conductor 6 . In addition, after the 6th modification of the short circuiting element 110 WHEREIN: In order to distinguish from the 2nd soluble conductor 6b, the soluble conductor 6 is made into the 1st soluble conductor 6a, and illustration and description are performed.

[Flex Sheet]

In addition, the short-circuiting element 110 is provided in Figs. 25 and 26 (A) to prevent oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3, to remove oxides during melting and to improve the fluidity of the solder. As shown, the flex sheet 5 is mounted on the whole surface of the outermost layer on the 1st soluble conductor 6a and the 2nd soluble conductor 6b. The flex sheet 5 is obtained by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, impregnated with the flex 7 in a nonwoven fabric or mesh-shaped base material.

It is preferable that the flex sheet 5 has an area larger than the total surface area of the 1st soluble conductor 6a and the 2nd soluble conductor 6b. Thereby, even when the 1st soluble conductor 6a and the 2nd soluble conductor 6b are completely coat|covered with the flex sheet 5 and the volume expands by melting, the oxide by the flex 7 reliably. Rapid melting can be realized by improving removal and wettability.

By disposing the flex sheet 5, also in the heat treatment step at the time of mounting the fuse element 1 or the mounting of the short circuit element 110, the flex 7 is applied to the first soluble conductor 6a and the second soluble conductor ( 6b) can be maintained over the entire surface, and at the time of actual use of the short-circuiting element 110, the wettability of the low-melting-point metal layer 3 (eg, solder) is improved, and the first and second low-melting-point metals The oxide during dissolution is removed and the rapid melting property can be improved by using the erosion action on the high-melting-point metal (eg, Ag).

Moreover, by arrange|positioning the flex sheet 5, on the surface of the refractory-point metal layer 2 of the outermost layer of the 1st soluble conductor 6a and the 2nd soluble conductor 6b, Pb-free solder etc. which have Sn as a main component Even when the antioxidant film is formed, the oxide of the antioxidant film can be removed, the oxidation of the high-melting-point metal layer 2 can be effectively prevented, and the rapid melting property can be maintained and improved.

Moreover, as shown in FIG.26(B), the flex sheet 5 can be mounted also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b. Moreover, it goes without saying that you may make it mount the flex sheet 5 only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

[Variation example 7 of short-circuit element]

Moreover, the short circuiting element 110 divides|segments the flex sheet 5 into each of the 1st soluble conductor 6a, the 2nd soluble conductor 6b, as shown to FIG.27(A), and is mounted individually. You can do it.

Moreover, as shown in FIG.27(B), the flex sheet 5 can be mounted individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it mount the flex sheet 5 individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

[Variation example 8 of short-circuit element]

Moreover, the short circuiting element 110, as shown to FIG. 28(A), after the 1st soluble conductor 6a apply|coats the flax 7 to each of the 2nd soluble conductors 6b, a nonwoven fabric or You may mount the holding body 8 containing a mesh-shaped base material over the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

Moreover, as shown to FIG.28(B), the flex sheet 5 can be mounted also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b. Moreover, it goes without saying that you may make it mount the flex sheet 5 only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

[Modified example 9 of short-circuit element]

Moreover, the short circuiting element 110, as shown in FIG. 29(A), after the 1st soluble conductor 6a apply|coats the flax 7 to each of the 2nd soluble conductors 6b, a nonwoven fabric or The holding body 8 containing a mesh-shaped base material is made to correspond to the 1st soluble conductor 6a and the 2nd soluble conductor 6b, and is divided|segmented, and on the 1st soluble conductor 6a and the 2nd soluble conductor 6b Each may be loaded individually.

Moreover, as shown to FIG.29(B), the flex sheet 5 can be mounted individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it mount the flex sheet 5 individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

[Modified example 10 of short-circuit element]

In addition, the short circuiting element 110, as shown in FIG. 30(A), to the 1st soluble conductor 6a and the 2nd soluble conductor 6b, to the flex 7 of a fluid or semi-fluid body, an insulator piece ( 10) may be kneaded and the insulator piece-containing flax 119b may be applied.

Moreover, as shown in FIG.30(B), the insulator piece containing flax 119b can be apply|coated individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it apply|coat the insulator piece containing flax 119b individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

Also in the short circuiting element 110 shown in FIGS. 26-30, it is preferable that the 1st, 2nd electrodes 113, 114 have a larger area than the 3rd, 4th electrodes 115, 124. Thereby, the short circuiting element 110 can aggregate more molten conductors on the 1st, 2nd electrodes 113, 114, and can short-circuit between the 1st, 2nd electrodes 113, 114 reliably. can

[switching element]

Then, the switching element using the fuse element 1 is demonstrated. A plan view of the switching element 130 in FIG. 31 and a cross-sectional view of the switching element 130 in FIG. 32A are shown. The switching element 130 includes an insulating substrate 131 , a first heating element 132 and a second heating element 133 provided on the insulating substrate 131 , and a first electrode provided adjacent to each other on the insulating substrate 131 . 134 and the second electrode 135 , a third electrode 136 provided adjacent to the first electrode 134 , and electrically connected to the first heating element 132 , and the second electrode 135 . A fourth electrode 137 provided adjacent to the second heating element 133 and electrically connected to the fourth electrode 137 , a fifth electrode 138 provided adjacent to the fourth electrode 137 , and the first and third electrodes The first soluble conductor which constitutes a current path by being provided between 134 and 136 and cuts the current path between the first and third electrodes 134 and 136 by heating from the first heating element 132 by melting. (6a) and the second, fourth, and fourth electrodes provided from the second electrode 135 to the fifth electrode 138 via the fourth electrode 137 and heated from the second heating element 133. A second soluble conductor 6b for cutting the current path between the 5 electrodes 135, 137, 138, and a flex sheet 5 mounted on the first soluble conductor 6a and the second soluble conductor 6b and , a cover member 139 protecting the inside is provided on the insulating substrate 131 . Moreover, the fuse element 1 is 1st soluble conductor 6a and 2nd soluble conductor 6b, and 1st soluble conductor 6a and 2nd soluble conductor 6b top and/or 1st soluble conductor ( 6a) and a flex sheet 5 mounted under the second soluble conductor 6b. In addition, about the flex sheet 5 mounted under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, it shows in FIG.32(B).

The insulating substrate 131 is formed in a rectangular shape by, for example, an insulating member such as alumina, glass ceramics, mullite, or zirconia. In addition, the insulating substrate 131 may use the material used for printed wiring boards, such as a glass epoxy board|substrate and a phenol board|substrate.

The first and second heating elements 132 and 133 are conductive members that generate heat when energized, similarly to the above-described heating element 93 , and can be formed in the same manner as the heating element 93 . In addition, the 1st soluble conductor 6a and the 2nd soluble conductor 6b have the structure similar to the soluble conductor 6 mentioned above.

In addition, the first and second heating elements 132 and 133 are covered by the insulating member 140 on the insulating substrate 131 . On the insulating member 140 covering the first heating element 132 , first and third electrodes 134 and 136 are formed, and on the insulating member 140 covering the second heating element 133 , the second, Fourth and fifth electrodes 135 , 137 , and 138 are formed. The first electrode 134 is formed adjacent to the second electrode 135 on one side and is insulated. A third electrode 136 is formed on the other side of the first electrode 134 . The 1st electrode 134 and the 3rd electrode 135 conduct when the 1st soluble conductor 6a is connected, and comprises the current short circuit path|route of the switching element 130. As shown in FIG. Further, the first electrode 134 is connected to a first external connection terminal 134a provided on the back surface 131b of the insulating substrate 131 through a caster that faces the side surface of the insulating substrate 131 .

In addition, the third electrode 136 is connected to the first heating element 132 through the first heating element extraction electrode 141 provided on the insulating substrate 131 or the insulating member 140 . In addition, the first heating element 132 is provided on the back surface 131b of the insulating substrate 131 through the first heating element electrode 142 and the caster facing the side edge of the insulating substrate 131 . It is connected to the power supply terminal 142a.

A fourth electrode 137 is formed on the other side opposite to the one side adjacent to the first electrode 134 of the second electrode 135 . In addition, the fifth electrode 138 is formed on the other side opposite to the one side adjacent to the second electrode 135 of the fourth electrode 137 . The 2nd electrode 135, the 4th electrode 137, and the 5th electrode 138 are connected with the 2nd soluble conductor 6b. In addition, the second electrode 135 is connected to a second external connection terminal 135a provided on the back surface 131b of the insulating substrate 131 through a caster that faces the side surface of the insulating substrate 131 .

Further, the fourth electrode 137 is connected to the second heating element 133 through the second heating element extraction electrode 143 provided on the insulating substrate 131 or the insulating member 140 . In addition, the second heating element 133 is provided on the back surface 131b of the insulating substrate 131 through the second heating element electrode 144 and the casterization facing the side edge of the insulating substrate 131 . It is connected to the power supply terminal 144a.

In addition, the fifth electrode 138 is connected to a fifth external connection terminal 138a provided on the back surface of the insulating substrate 131 through a caster that faces the side surface of the insulating substrate 131 .

As for the switching element 130, the 1st soluble conductor 6a is connected from the 1st electrode 134 over the 3rd electrode 136, and it is 5th from the 2nd electrode 135 through the 4th electrode 137. The 2nd soluble conductor 6b is connected across the electrode 138. The 1st, 2nd soluble conductors 6a, 6b are excellent in mountability, since tolerance with respect to a high-temperature environment is improved by providing the high-melting-point metal layer 2 similarly to the soluble conductor 6 mentioned above, After being mounted on the first to fifth electrodes 134 to 138 through a connection material 145 such as solder, connection can be made easily by reflow soldering or the like.

The first to fifth electrodes 134 to 138 can be formed using a general electrode material such as Cu or Ag, but at least on the surfaces of the first and second electrodes 134 and 135, Ni/Au It is preferable that the protective layer 149, such as plating, Ni/Pd plating, and Ni/Pd/Au plating, is formed by a well-known plating process. Thereby, oxidation of the 1st, 2nd electrodes 134 and 135 can be prevented, and a molten conductor can be hold|maintained reliably. Moreover, when reflow-mounting the switching element 130, the solder which connects the 1st, 2nd soluble conductors 6a, 6b, or the low which forms the outer layer of the 1st, 2nd soluble conductors 6a, 6b By melting the melting point metal, it is possible to prevent erosion (solder erosion) of the first and second electrodes 134 and 135 .

Moreover, to the 1st thru|or 5th electrodes 134-138, the connection material 145 of the fusion|melting conductor of 1st, 2nd soluble conductor 6a, 6b mentioned above, and 1st, 2nd soluble conductor 6a, 6b. ) is formed with an outflow prevention part 147 made of an insulating material such as glass to prevent outflow.

[Flex Sheet]

In addition, in order to prevent oxidation of the high-melting-point metal layer 2 or the low-melting-point metal layer 3, and to remove oxides during melting and improve the fluidity of the solder, the switching element 130 is shown in FIGS. 31 and 32 (A). As shown, the flex sheet 5 is mounted on the whole surface of the outermost layer on the 1st, 2nd soluble conductors 6a, 6b. The flex sheet 5 is obtained by impregnating and holding the flex 7 of a fluid or semi-fluid body on a sheet-shaped support 8, for example, impregnated with the flex 7 in a nonwoven fabric or mesh-shaped base material.

It is preferable that the flex sheet 5 has an area larger than the total surface area of the 1st, 2nd soluble conductors 6a, 6b. Thereby, even when the 1st, 2nd soluble conductors 6a, 6b are completely coat|covered with the flex sheet 5 and the volume expands by melting, oxide removal and wettability by the flex 7 reliably. It is possible to realize rapid melting by the improvement of

By arranging the flex sheet 5, the flex 7 is applied to all of the first and second soluble conductors 6a and 6b in the heat treatment process at the time of mounting the fuse element 1 or the switching element 130. It can be maintained over the surface, and at the time of actual use of the switching element 130, the wettability of the low-melting-point metal layer 3 (eg, solder) is improved, and the first and second low-melting-point metals are dissolved. It is possible to improve the rapid melting property by removing the oxide from the copper and using the erosion action on the high melting point metal (eg Ag).

Moreover, by arranging the flex sheet 5, on the surface of the refractory metal layer 2 of the outermost layer of the 1st, 2nd soluble conductors 6a, 6b, antioxidant films, such as Pb-free solder which have Sn as a main component, etc. Even when formed, the oxide of the oxidation prevention film can be removed, oxidation of the high-melting-point metal layer 2 can be effectively prevented, and rapid melting properties can be maintained and improved.

Moreover, as shown in FIG.32(B), the flex sheet 5 can be mounted also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b. Moreover, it goes without saying that you may make it mount the flex sheet 5 only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

[No cover]

The switching element 130 has a cover member 139 that protects the inside on the surface 131a of the insulating substrate 131 on which the fuse element 1 is installed and prevents scattering of the molten fuse element 1 . installed.

The cover member 139 can be formed of an insulating member such as various engineering plastics or ceramics. As for the switching element 130, since the fuse element 1 is covered with the cover member 139, also at the time of self-heating interruption|blocking accompanying generation|occurrence|production of the arc discharge by overcurrent, the 1st, 2nd soluble conductor 6a , 6b) and the like are captured by the cover member 139 to prevent scattering to the surroundings.

Further, the cover member 139 has a projection 139b extending from the ceiling surface 139a toward the insulating substrate 131 to at least the side surface of the flex sheet 5 . As for the cover member 139, since the side surface of the flex sheet 5 is restricted from movement by the protrusion 139b, it is possible to prevent the flex sheet 5 from being misaligned. That is, the protrusion 139b has a size that maintains a predetermined clearance rather than the size of the flex sheet 5 , and is provided corresponding to a position where the flex sheet 5 is to be held. In addition, the protrusion part 139b is good also as a wall surface which goes around and covers the side surface of the flex sheet 5, and may protrude partially.

In addition, the cover member 139 has a structure in which a predetermined interval is provided between the flex sheet 5 and the ceiling surface 139a. As shown in FIG. 35, when the 1st, 2nd soluble conductors 6a, 6b melt|melt, it is because the clearance for the fusion|melting conductor which melted to push up the flex sheet 5 is needed.

Accordingly, in the cover member 139 , the height of the inner space of the cover member 139 (the height to the ceiling surface 139a ) is the first and second solubles melted on the surface 131a of the insulating substrate 131 . It is comprised so that it may become larger than the sum of the height of the conductors 6a, 6b (when divided into a plurality of molten conductors, the highest height among the molten conductors), and the thickness of the flex sheet 5. As shown in FIG.

[switching element circuit]

The above switching element 130 has a circuit structure as shown in FIG. That is, in the switching element 130 , the first electrode 134 and the second electrode 135 are insulated during normal operation, and the first and second heating elements 132 and 133 generate heat from the first and second electrodes. When the soluble conductors 6a and 6b melt, the switch 150 short-circuited through the molten conductor will be constituted. The first external connection terminal 134a and the second external connection terminal 135a constitute both terminals of the switch 150 .

Moreover, the 1st soluble conductor 6a is connected with the 1st heat generating body 132 via the 3rd electrode 136 and the 1st heat generating body lead-out electrode 141. The 2nd soluble conductor 6b is connected with the 2nd heat generating body 133 via the 4th electrode 137 and the 2nd heat generating body lead-out electrode 143, Furthermore, 2nd heat generating body electric power is supplied through the 2nd heat generating body electrode 144. It is connected to the terminal 144a. That is, the 2nd electrode 135 to which the 2nd soluble conductor 6b and the 2nd soluble conductor 6b are connected, the 4th electrode 137, and the 5th electrode 138 before operation of the switching element 130 In this case, the 2nd electrode 135 and the 5th electrode are made to conduct between the 2nd electrode 135 and the 5th electrode 138 through the 2nd soluble conductor 6b, and the 2nd soluble conductor 6b is cut by melting. (138) functions as a protection element that cuts off the distance.

And when the switching element 130 is energized to the 2nd heating element 133 from the 2nd heating element feeding terminal 144a, as shown in FIG. 34, by heat_generation|fever of the 2nd heating element 133, a 2nd soluble conductor (6b) melts and aggregates on the second, fourth, and fifth electrodes 135, 137, and 138, respectively. Thereby, the current path which spanned the 2nd electrode 135 and the 5th electrode 138 which were connected via the 2nd soluble conductor 6b is interrupted|blocked. Moreover, in the switching element 130, when electricity is supplied to the 1st heating element 132 from the 1st heating element power supply terminal 142a, the 1st soluble conductor 6a is melted by heat|fever of the 1st heating element 132, The first and third electrodes 134 and 136 aggregate respectively. Thereby, as for the switching element 130, as shown in FIG. 35, the molten conductor of 1st, 2nd soluble conductor 6a, 6b which aggregated in the 1st electrode 134 and the 2nd electrode 135 is By bonding, the insulated first electrode 134 and second electrode 135 are short-circuited. That is, the switching element 130 short-circuits the switch 150 so that a current path spanning the second and fifth electrodes 135 and 138, and a current path spanning between the first and second electrodes 134 and 135 are short-circuited. can be converted to

At this time, as for the 1st, 2nd soluble conductors 6a, 6b, since the low-melting-point metal layer 3 with a lower melting|fusing point than the high-melting-point metal layer 2 is laminated|stacked as mentioned above, a 1st, 2nd heating element ( 132, 133) starts to erode the high-melting-point metal layer 2 by heat generation. Therefore, the 1st, 2nd soluble conductors 6a, 6b utilize the erosion action of the high-melting-point metal layer 2 by the low-melting-point metal layer 3, The high-melting-point metal layer 2 at a temperature lower than the melting temperature. It can be melted and melted quickly.

In addition, energization to the 1st heating element 132 is stopped because between the 1st, 3rd electrodes 134 and 136 is interrupted|blocked by the 1st soluble conductor 6a by fusion cutting, and electricity supply to the 2nd heating element 133 is stopped. , The second soluble conductor 6b is cut by fusion, so that between the second and fourth electrodes 135 and 137 and between the fourth and fifth electrodes 137 and 138 are blocked.

[Line melting of the second soluble conductor]

Here, as for the switching element 130 at the time of using for protection circuits, such as a lithium ion battery, it is preferable that the 2nd soluble conductor 6b precedes the 1st soluble conductor 6a, and fuse|melts. This is because if the short circuit is performed first, there is a risk of a short circuit accident of the battery cell. As for the switching element 130, since the 1st heating element 132 and the 2nd heating element 133 generate|occur|produce separately, as the timing of energization, the 2nd heating element 133 heats first, and then the 1st heating element 132. By generating heat, as shown in FIG. 36, the 2nd soluble conductor 6b is melted ahead of the 1st soluble conductor 6a, and, as shown in FIG. 37, the 1st, 2nd electrode ( The first and second molten conductors of the soluble conductors 6a and 6b are aggregated and combined on 134 and 135 to short-circuit the first and second electrodes 134 and 135 .

Moreover, the switching element 130 cuts the 2nd soluble conductor 6b by melting earlier than the 1st soluble conductor 6a by forming the 2nd soluble conductor 6b narrower than the 1st soluble conductor 6a. You can do it. Since cutting time can be shortened by forming the 2nd soluble conductor 6b narrowly, the 2nd soluble conductor 6b can precede rather than the 1st soluble conductor 6a, and can melt|melt.

Moreover, as for the switching element 130 in the case of using for switching of a backup circuit, it is preferable that the 1st soluble conductor 6a precedes the 2nd soluble conductor 6b conversely, and melts. This is because there is a risk of system shutdown if blocking is performed first.

[electrode area]

Further, in the switching element 130 , the area of the first electrode 134 is larger than that of the third electrode 136 , and the area of the second electrode 135 is larger than that of the fourth and fifth electrodes 137 and 138 . It is preferable to do Since the holding amount of the molten conductor increases in proportion to the electrode area, by forming the areas of the first and second electrodes 134 and 135 wider than the third, fourth, and fifth electrodes 136 , 137 and 138 , , more molten conductors can be aggregated on the first and second electrodes 134 and 135 , so that the first and second electrodes 134 and 135 can be reliably short-circuited.

[Manufacturing method]

As the manufacturing method of the switching element 130, the manufacturing method regarding the fuse element 1, the fuse element 80, the protection element 90, and the short circuit element 110 described above can be used. In addition, below, as a manufacturing method of the switching element 130, only the part which mounts the fuse element 1 on the insulating substrate 131 is demonstrated, and detailed description of another process is abbreviate|omitted.

First, on the surface 131a side of the insulating substrate 131 , a connection material 145 such as solder paste is applied on the first to fifth electrodes 134 to 138 , and the first to fifth electrodes 134 to 138 are applied. 138 , connecting portions of the first and second fusible conductors 6a , 6b of the fuse element 1 . Thereby, the 1st, 2nd soluble conductors 6a, 6b of the fuse element 1 are mounted suitably on the 1st - 5th electrodes 134-138.

Next, after applying the adhesive 151 to the surface 131a side of the insulating substrate 131 in a predetermined range, by adhering the cover member 139 , the fuse element 1 is covered, and the switching element 130 . is completed The protrusion 139b of the cover member 139 does not interfere with the flex sheet 5 because there is a predetermined clearance with respect to the mounting position of the flex sheet 5 .

Here, about the mounting method of the fuse element 1 in the switching element 130, you may make it introduce|transduce the manufacturing process of the fuse element 1 dividedly into the manufacturing process of the switching element 130.

Specifically, before bonding the flex sheet 5 of the fuse element 1 to the soluble conductor 6, the single-piece|unit of the 1st, 2nd soluble conductors 6a, 6b is each 1st - 5th electrode ( 134-138), it mounts and connects suitably, and you may make it temporarily fix the flex sheet 5 on 1st, 2nd soluble conductors 6a, 6b using fixing agents, such as a flex 7, etc. As another example, the single-piece|unit of the 1st, 2nd soluble conductors 6a, 6b is mounted suitably on the 1st thru|or 5th electrodes 134-138, respectively, and it connects, and 1st, 2nd soluble conductors 6a, 6b ), the insulator piece containing flax 9 may be applied and dried. Moreover, as another example, the 1st, 2nd soluble conductor 6a, 6b single-piece|unit is mounted on the 1st thru|or 5th electrodes 134-138, and is connected, On the 1st, 2nd soluble conductors 6a, 6b Before the plex 7 is dripped or applied, and the flex 7 is dried, a support 8 having liquid retention properties is loaded on the plex 7 to absorb the flex 7, and thereafter, the flex 7 may be allowed to dry.

By introducing the manufacturing method of the fuse element 1 into the manufacturing method of the switching element 130 , it is unnecessary to manufacture the fuse element 1 in advance, and the manufacturing process of the fuse element 1 is reduced to the switching element 130 . Since it can be integrated with the manufacturing process of

In addition, even when the manufacturing method of the fuse element 1 is introduce|transduced into the inside of the manufacturing method of the switching element 130, it is needless to explain that the process of adhering the cover member 139 becomes the last.

[Modification example 1 of switching element]

Next, the first modification of the switching element 130 will be described. As the switching element 130, as shown in FIG. 38A, you may make it use what replaced the flex sheet 5 with the flex sheet 148a. In the switching element 130 shown in Fig. 38A, there is no particular change in portions other than the flex sheet 148a.

The flex sheet 148a is formed by impregnating and holding the flex 7 of a fluid or semi-fluid body in a sheet-shaped support 8, for example, a non-woven fabric or a mesh-shaped base material impregnated with the flex 7, or A nonwoven fabric or a mesh-shaped base paper is arranged on the flax 7 applied to the outermost layer of the first and second soluble conductors 6a and 6b, and the flax 7 is impregnated. The flex sheet 148a can hold the fluid or semi-fluid flex 7 by the support 8 having liquid retention properties.

When using the structure shown by the modification 1 of the switching element 130, in the manufacturing method of the above-mentioned switching element 130 WHEREIN: 1st, 2nd soluble conductors 6a, 6b single-piece|unit 1st - 5th After being mounted on the electrodes 134 to 138 and connected, a fluid or semi-fluid flex 7 is applied or dropped on the first and second soluble conductors 6a and 6b, and a sheet-like shape is placed on the flax 7 . It can be manufactured by loading the support body 8 of

Moreover, as shown to FIG.38(B), the flex sheet 148a can be mounted also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b. Moreover, it goes without saying that you may make it mount the flex sheet 148a only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

[Modification Example 2 of the Switching Element]

Next, the second modification of the switching element 130 will be described. As the switching element 130, as shown in FIG. 39(A), you may make it use what replaced the flex sheet 5 with the insulator piece containing flex 148b. In the switching element 130 shown in Fig. 39A, there is no particular change in portions other than the insulator piece containing flax 148b.

The insulator piece-containing flex 148b does not impregnate the sheet-shaped support 8 with the fluid or semi-fluid flex 7, and the fluid or semi-fluid flex 7 has a needle-shaped or short-fiber insulator piece 10. It is kneaded and contained, and it apply|coated to the 1st, 2nd soluble conductors 6a, 6b. The insulator piece-containing flax 148b can hold the fluid or semi-fluid flex 7 on the first and second soluble conductors 6a and 6b by the insulator piece 10 having liquid retention properties.

When using the structure shown by the modification 2 of the switching element 130, in the manufacturing method of the above-mentioned switching element 130 WHEREIN: 1st, 2nd soluble conductor 6a, 6b single-piece|unit 1st - 5th After being mounted on the electrodes 134 to 138, the insulator piece-containing flax 148b in which the needle-shaped or short-fiber insulator piece 10 is kneaded and contained is placed on the first and second soluble conductors 6a and 6b. It can be manufactured by coating.

Moreover, as shown in FIG.39(B), the insulator piece containing flax 148b can be apply|coated also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b. In addition, it goes without saying that you may make it apply|coat the insulator piece containing flax 148b only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b.

[Modified example 3 of the switching element]

In addition, the switching element 130 does not necessarily cover the first and second heating elements 132 and 133 with the insulating member 140 , and the first and second heating elements 132 and 133 are formed on an insulating substrate ( 131) may be installed inside. By using a material having excellent thermal conductivity as the material of the insulating substrate 131 , the first and second heating elements 132 and 133 can be heated in the same manner as in the case of passing through the insulating member 140 such as a glass layer.

[Modification Example 4 of the Switching Element]

In addition, in the switching element 130 , the first and second heating elements 132 and 133 are opposite to the formation surfaces of the first to fifth electrodes 134 , 135 , 136 , 137 and 138 of the insulating substrate 131 . It may be provided on the back surface 131b. By forming the first and second heating elements 132 and 133 on the back surface 131b of the insulating substrate 131 , they can be formed in a simpler process than forming in the insulating substrate 131 . Also, in this case, if the insulating member 140 is formed on the first and second heating elements 132 and 133 , it is preferable in the sense of protecting the resistor or securing insulation during mounting.

[Modified example 5 of the switching element]

In addition, as shown to Fig.40 (A), the switching element 130 is each individually so that the flex sheet 5 may correspond to each of the 1st soluble conductor 6a and the 2nd soluble conductor 6b. It may be mounted.

Moreover, as shown in FIG.40(B), the flex sheet 5 can be mounted individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it mount the flex sheet 5 individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

[Modified example 6 of the switching element]

Moreover, as shown in FIG. 41(A), the switching element 130 is provided individually so that the flex sheet 5 may correspond to each of the 1st soluble conductor 6a, the 2nd soluble conductor 6b. When the first soluble conductor 6a and the second soluble conductor 6b are respectively dripped or coated with a fluid or semi-fluid flax 7, and before drying the flax 7, a holding body having liquid retention properties ( You may make it divide and mount 8) so that it may correspond on the 1st soluble conductor 6a and the 2nd soluble conductor 6b. After drying the flex 7, the flex sheet 5 is divided and formed in the same manner as in FIG. 40 .

Moreover, as shown to FIG. 41(B), the flex sheet 5 can be mounted individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it mount the flex sheet 5 individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

[Variation example 7 of switching element]

Moreover, the switching element 130 is, as shown in FIG. 42(A), to the 1st soluble conductor 6a and the 2nd soluble conductor 6b, to the flex 7 of a fluid or semi-fluid body, an insulator piece ( 10) may be kneaded and the insulator piece-containing flax 148c may be applied.

Moreover, as shown in FIG.42(B), the insulator piece containing flax 148c can be apply|coated individually also under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively. In addition, of course, you may make it apply|coat the insulator piece containing flax 148c individually only under the 1st soluble conductor 6a and the 2nd soluble conductor 6b, respectively.

1: fuse element 2: high melting point metal layer
3: low melting point metal layer 5: flex sheet
6: soluble conductor 7: flex
8: holding body 9: Insulator piece containing flex
10: insulator piece 80: fuse element
81: insulating substrate 81a: surface
81b: back surface 82: first electrode
83: second electrode 84: adhesive
85a: flex sheet (modified example) 85b: flex with insulator piece
86: protective layer 88: connection material (solder paste)
89: cover member 89a: ceiling surface
89b: protrusion 90: protection element
91: insulating substrate 91a: surface
91b: back side 92: insulating member
93: heating element 94: first electrode
94a: first external connection terminal 95: second electrode
95a: second external connection terminal 96: heating element extraction electrode
96a: lower layer 96b: upper layer
97: cover member 97a: ceiling surface
97b: protrusion 98: protective layer
99: heating element electrode 99a: heating element feeding terminal
100: connection material (solder paste) 102: spill prevention part
103: adhesive 104a: flex sheet (modified example)
104b: Insulator piece containing flex (modified example)
110: short circuit element 111: insulated substrate
111b: back side 112: heating element
112a: heating element feeding terminal 113: first electrode
113a: first external connection terminal 114: second electrode
114a: second external connection terminal 115: third electrode
118: insulating member 116: cover member
116a: ceiling surface 116b: protrusion
117: Connection material (solder paste) 119a: Flex sheet (modified example)
119b: Insulator piece containing flex (modified example)
120: heating element extraction electrode 121: heating element electrode
121a: heating element feeding terminal 123: switch
124: fourth electrode 126: leakage preventing part
128: adhesive 129: protective layer
130: switching element 131: insulating substrate
131b: back side 132: first heating element
132a: first heating element feeding terminal 133: second heating element
133a: second heating element feeding terminal 134: first electrode
134a: first external connection terminal 135: second electrode
135a: second external connection terminal 136: third electrode
137: fourth electrode 138: fifth electrode
138a: fifth external connection terminal 139: cover member
139a: ceiling surface 139b: protrusion
140: insulating member 141: heating element electrode
142: heating element drawing electrode 142a: heating element feeding terminal
145: connection material (solder paste) 147: spill prevention part
148a: flex sheet (modified example) 148b: insulator piece containing flex (modified example)
148c: Insulator piece containing flex (modified example)
149: protective layer 150: switch
151 adhesive

Claims (33)

It is a flex sheet mounted on a fusible conductor of a surface mount type fuse element by reflow mounting,
The soluble conductor is a laminate of three or more metal layers having different melting points,
A flex sheet is impregnated with an insulator made of a needle shape or fiber, wherein the insulator has a specific gravity less than that of the soluble conductor and maintains the flex even when exposed to a surface mounting temperature. The flex sheet of claim 1 , wherein the insulator is fiberglass. The flex sheet according to claim 1 or 2, wherein the insulator is impregnated with flax, the solvent powder is dried and solidified, and then cut to a desired size. The flex sheet according to claim 1 or 2, wherein the flex sheet is mounted on and/or under the fusible conductor of the fuse element,
The insulator is deformed or melted at a temperature exceeding a mounting temperature of the fuse element to have fluidity, a flex sheet. The flex sheet according to claim 4, wherein the insulator is deformed or melted at a temperature of 300°C or higher to have fluidity. The flex sheet according to claim 1 or 2, wherein the insulator has a specific gravity of 5 g/cm ³ or less. It is a flax applied on and/or under the soluble conductor of a surface mount type fuse element by reflow mounting,
The soluble conductor is a laminate of three or more metal layers having different melting points,
A fluid or semi-fluid flex having an insulator piece made of needle-shaped or short fibers having liquid retention properties added thereto, the specific gravity of the insulator piece being less than or equal to that of the soluble conductor, and maintaining the flex even when exposed to a surface mounting temperature. The flex according to claim 7, wherein the insulator piece is glass fiber. The flax according to claim 7 or 8, wherein the flax is applied on the fusible conductor of the fuse element,
The insulator piece has fluidity by deforming or melting at a temperature exceeding a mounting temperature of the fuse element. The flex according to claim 9, wherein the insulator piece is deformed or melted at a temperature of 300°C or higher to have fluidity. The flex according to claim 7 or 8, wherein the insulator piece has a specific gravity of 5 g/cm ³ or less. It is a fuse element of a surface mount type device by reflow mounting,
a fusible conductor;
Having a flex sheet having a specific gravity equal to or less than that of the soluble conductor and impregnated with a flex in an insulator made of a needle shape or fiber and maintaining the flex even when exposed to a surface mounting temperature,
The soluble conductor is a laminate of three or more metal layers with different melting points,
A fuse element having the flex sheet mounted on and/or under the fusible conductor. The fuse element according to claim 12, wherein an area of the flex sheet is larger than an area of the fusible conductor. The fuse element according to claim 12 or 13, wherein the insulator has fluidity by deforming or melting at a temperature exceeding a mounting temperature of the fuse element. The fuse element according to claim 14 , wherein the insulator deforms or melts at a temperature of 300° C. or higher to have fluidity. 14. The fuse element according to claim 12 or 13, wherein the insulator has a specific gravity of 5 g/cm ³ or less. It is a fuse element of a surface mount type device by reflow mounting,
a fusible conductor;
The specific gravity is less than the specific gravity of the soluble conductor, and an insulator piece made of needle-shaped or short fibers having liquid retention is added, and the flex of a fluid or semi-fluid body that maintains the flex even when exposed to a surface mounting temperature,
The soluble conductor is a laminate of three or more metal layers with different melting points,
A fuse element having the flax applied over and/or under the fusible conductor. The fuse element according to claim 17, wherein the insulator piece has fluidity by deforming or melting at a temperature exceeding a mounting temperature of the fuse element. The fuse element according to claim 18, wherein the insulator piece has fluidity by deforming or melting at a temperature of 300°C or higher. 20. The fuse element according to any one of claims 17 to 19, wherein the insulator piece has a specific gravity of 5 g/cm ³ or less. It is a surface mount type fuse element by reflow mounting,
a fusible conductor;
A flex sheet is impregnated with a flex in an insulator made of needles or fibers whose specific gravity is less than or equal to that of the soluble conductor, and the flex sheet is maintained even when exposed to a surface mounting temperature;
The soluble conductor is a laminate of three or more metal layers with different melting points,
Mounting the flex sheet on and/or under the soluble conductor,
A fuse element in which the soluble conductor is fused by an overcurrent flowing through the soluble conductor. It is a surface mount type fuse element by reflow mounting,
having a fusible conductor,
The soluble conductor is a laminate of three or more metal layers with different melting points,
A fluid or semi-fluid material having a specific gravity less than that of the soluble conductor on the soluble conductor and/or under the soluble conductor and containing an insulator piece made of needle-shaped or short fibers having liquid retention properties and retaining flex even when exposed to surface mounting temperature. of the flax is applied,
A fuse element in which the soluble conductor is fused by an overcurrent flowing through the soluble conductor. It is a surface mount type protection element by reflow mounting,
an insulated substrate;
a heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed on the insulating substrate;
a third electrode electrically connected to the heating element;
A soluble conductor connected from the first electrode through the third electrode over the second electrode;
Having a flex sheet having a specific gravity equal to or less than that of the soluble conductor and impregnated with a flex in an insulator made of a needle shape or fiber and maintaining the flex even when exposed to a surface mounting temperature,
The soluble conductor is a laminate of three or more metal layers with different melting points,
Mounting the flex sheet on and/or under the soluble conductor,
A protection element that cuts off the soluble conductor by energizing the heating element to cut off the space between the first electrode and the second electrode. 24. The method according to claim 23, comprising a cover member for covering the soluble conductor and the flex sheet on the insulating substrate,
The protection element whose height of the internal space of the said cover member is higher than the sum of the height after melting|fusing of the said soluble conductor, and the thickness of the said flex sheet. The protective element according to claim 24, wherein the cover member has a protrusion for restricting movement of the flex sheet in the inner space of the cover member. The protection element in any one of Claims 23-25 which has a plurality of the said soluble conductor and the said flex sheet. The protection element in any one of Claims 23-25 whose area of the said flex sheet is larger than the area of the said soluble conductor. It is a surface mount type protection element by reflow mounting,
an insulated substrate;
a heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed on the insulating substrate;
a third electrode electrically connected to the heating element;
It has a soluble conductor connected from the said 1st electrode through the said 3rd electrode over the said 2nd electrode,
The soluble conductor is a laminate of three or more metal layers with different melting points,
A fluid or semi-fluid material having a specific gravity less than that of the soluble conductor on the soluble conductor and/or under the soluble conductor and containing an insulator piece made of needle-shaped or short fibers having liquid retention properties and retaining flex even when exposed to surface mounting temperature. of the flax is applied,
A protection element that cuts off the soluble conductor by energizing the heating element to cut off the space between the first electrode and the second electrode. It is a surface mount type short circuit device by reflow mounting,
an insulated substrate;
a heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed adjacent to the insulating substrate;
a third electrode electrically connected to the heating element;
A soluble conductor connected from the first electrode to the third electrode;
A flex sheet is impregnated with a flex in an insulator made of needles or fibers whose specific gravity is less than or equal to that of the soluble conductor, and the flex sheet is maintained even when exposed to a surface mounting temperature;
The soluble conductor is a laminate of three or more metal layers with different melting points,
Mounting the flex sheet on and/or under the soluble conductor,
A short circuiting element for performing a short circuit between the first electrode and the second electrode and a cutoff between the first electrode and the third electrode by cutting the soluble conductor by melting the soluble conductor by energized heat generated by the heating element. It is a surface mount type short circuit device by reflow mounting,
an insulated substrate;
a heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed adjacent to the insulating substrate;
a third electrode electrically connected to the heating element;
It has a soluble conductor connected across the said 3rd electrode from the said 1st electrode,
The soluble conductor is a laminate of three or more metal layers with different melting points,
A fluid or semi-fluid material having a specific gravity less than that of the soluble conductor on the soluble conductor and/or under the soluble conductor and containing an insulator piece made of needle-shaped or short fibers having liquid retention properties and retaining flex even when exposed to surface mounting temperature. of the flax is applied,
A short circuiting element for performing a short circuit between the first electrode and the second electrode and a cutoff between the first electrode and the third electrode by cutting the soluble conductor by melting the soluble conductor by energized heat generated by the heating element. It is a surface mount type switching element by reflow mounting,
an insulated substrate;
a first heating element and a second heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed adjacent to the insulating substrate;
a third electrode formed adjacent to the first electrode and electrically connected to the first heating element;
A first soluble conductor connected from the first electrode to the third electrode;
a fourth electrode electrically connected to the second heating element and formed adjacent to the second electrode;
a fifth electrode formed adjacent to the fourth electrode;
A second soluble conductor connected from the second electrode to the fifth electrode via the fourth electrode;
Having a flex sheet that maintains the flex even when exposed to a surface mounting temperature by impregnating a flex in an insulator made of needles or fibers whose specific gravity is less than or equal to the specific gravity of the first soluble conductor and the second soluble conductor,
The first soluble conductor and the second soluble conductor are laminated with three or more metal layers having different melting points,
Mounting the flex sheet on the first soluble conductor and the second soluble conductor and/or under the first soluble conductor and the second soluble conductor,
The second soluble conductor is cut by fusion heating of the second heating element to cut off between the second electrode and the fifth electrode,
The switching element which cuts a said 1st soluble conductor by melting by energization heat generation of a said 1st heat generating body, and short-circuits between a said 1st electrode and a 2nd electrode. It is a surface mount type switching element by reflow mounting,
an insulated substrate;
a first heating element and a second heating element formed on the insulating substrate or inside the insulating substrate;
a first electrode and a second electrode formed adjacent to the insulating substrate;
a third electrode formed adjacent to the first electrode and electrically connected to the first heating element;
A first soluble conductor connected from the first electrode to the third electrode;
a fourth electrode electrically connected to the second heating element and formed adjacent to the second electrode;
a fifth electrode formed adjacent to the fourth electrode;
It has a 2nd soluble conductor connected over the said 5th electrode through the said 4th electrode from the said 2nd electrode,
The first soluble conductor and the second soluble conductor are laminated with three or more metal layers having different melting points,
On the first soluble conductor and the second soluble conductor, and/or under the first soluble conductor and the second soluble conductor, the specific gravity is less than or equal to the specific gravity of the first soluble conductor and the second soluble conductor, and a needle shape having liquid retention or The flax of a fluid or semi-fluid material containing a piece of insulator made of short fibers and maintaining the flex even when exposed to a surface mounting temperature is applied,
The second soluble conductor is cut by fusion heating of the second heating element to cut off between the second electrode and the fifth electrode,
The switching element which cuts a said 1st soluble conductor by melting by energization heat generation of a said 1st heat generating body, and short-circuits between a said 1st electrode and a 2nd electrode. The switching element according to claim 32, wherein the flax is separately applied on the first soluble conductor and the second soluble conductor.

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