JPH0520246U - Hiuse board - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent smoke generation and heat damage on the substrate and enable fuse arrangements of multiple types from a single mold. A peripheral circuit having a common electrode and a plurality of individual electrodes connected to the common electrode is provided on an insulating substrate. The opening is provided at a portion where the individual electrodes are arranged in parallel, and a fusing member that fuses when an overcurrent flows through the opening is provided. The end of the fusing member is arranged on the upper surface of the end of the individual electrode. Insertion holes are provided on both sides of the individual electrode. The flat pressing portion of the connecting member is arranged on the upper surfaces of both ends of the fusing member, and the arm portions provided on both sides of the flat portion are inserted from the insertion holes, and the fusing member is pressed by the arm portion and the pressing portion. And the ends of the individual electrodes are clamped and pressed to connect the fusing member and the individual electrodes.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a fuse plate that has a function of a fusing circuit by appropriately setting the width or thickness of a part of the circuit formed on an insulating substrate to reduce the cross-sectional area. Is to control the cross-sectional area with high dimensional accuracy and accurately, and also to prevent damage due to heat generation due to overcurrent.In particular, when fuses are integrated and miniaturized, for example, industrial equipment, It is suitable for use as an integrated card fuse that integrates fuses in wire harnesses for automobiles, and as a small fuse in consumer electronic devices.

[0002]

[Prior Art]

 As shown in FIG. 12, conventionally, there has been provided an integrated card fuse in which a plurality of fuse patterns (hereinafter referred to as fusing circuits) are arranged in parallel on one insulating substrate.

In this integrated card fuse, a common electrode 3 is formed on an insulating substrate 1, one end side of each fusing circuit 2 is connected to the common electrode 3, and the other end side of each fusing circuit 2 is a connector. It is configured to be continuous with the individual electrode 4 that serves as a terminal contact portion.

In the integrated card fuse, a circuit is formed by punching a plate material on a resin base plate such as glass epoxy, polyimide, PET or etching a metal foil attached to the resin substrate.

When the metal foil attached on the insulating resin substrate is formed by etching, the substrate on which the metal foil (mainly copper foil) is attached is washed, a resist is applied to the surface of the metal foil, and then exposure / exposure is performed. After development and etching, as shown in FIG. 12, a peripheral circuit including the fusing circuit 2, the common electrode 3, and the individual electrode 4 is formed.

[0006]

[Problems to be solved by the device]

 In the fuse plate described above, when a large-capacity fusing circuit is formed on the resin insulating substrate, there is a risk that overheating will cause smoke to be emitted from the substrate and further burnout.

In order to solve this problem, an alumina ceramic having excellent heat resistance can be used as a substrate. However, since alumina ceramic is very expensive, there is a problem of cost increase and heat of a fusing circuit is also generated. The fusing characteristics are difficult to stabilize because they diffuse easily.

Further, as described above, since the fusing circuit is formed on one resin substrate by punching or etching the plate material, the fusing circuit and the peripheral circuit are simultaneously molded, and one die or mask has one Only the fuse array of the pattern could be created. That is, in order to change the width of the fusing circuit to change the capacity, a mold or mask is required separately.

Further, in the method of punching the plate material, the dimensional accuracy is poor, and the width of the fusing circuit has to be made small in the case of a fuse having a small capacity, so that it is extremely difficult to make the fusing circuit.

Further, in the method using etching, the thickness of the metal foil is constant, and the film thicknesses of the common electrode and the individual electrode are the same as the thickness of the fusing circuit. Therefore, the fusing property must be controlled only by the pattern width. However, it was difficult to create a fine pattern with high dimensional accuracy by the method of etching this metal foil.

As described above, if the width of the fusing circuit is made small, it becomes difficult to keep the dimensional accuracy high, and the fusing characteristic deteriorates. Therefore, in order to form a similar small-capacity fusing circuit, it is preferable that the metal foil is thin because the width of the fusing circuit can be widened by reducing the thickness of the metal foil. On the other hand, it is preferable that the common electrode and the individual electrode have a large thickness in order to reduce electric resistance. However, since the fusing circuit, the common electrode, and the individual electrode are all uniform as described above, there is a problem that the fusing circuit alone cannot be thin and the power supply circuit cannot be thick.

The present invention has been made in view of the problems in the above-described conventional fuse plate, and prevents smoke and burnout from the substrate that occur when a large-capacity fuse is built in, and also provides a single gold fuse. Even if a mold or mask is used, multiple fuse arrangements are possible, and the film thickness of the fusing circuit, which requires high dimensional accuracy, is thin and the film thickness of the common electrode and individual electrodes can be made large. , It was made with the purpose of solving all the problems of the past.

[0013]

[Means for Solving the Problems]

 Therefore, according to the present invention, an opening is provided in a circuit board having a peripheral circuit provided on an insulating substrate, and a fusing member that fuses when an overcurrent flows through the opening is installed, and both ends of the fusing member are connected to the peripheral circuit. The fuse plate is characterized by being connected to the.

Specifically, for example, the peripheral circuit includes a common electrode on the insulating substrate and a plurality of individual electrodes connected to the common electrode, and the opening is provided at a portion where the individual electrodes are arranged in parallel. The integrated card fuse may be configured by connecting a pair of end portions of the individual electrodes facing each other across the opening by a fusing member.

The pair of end portions of the individual electrode and the end portion of the fusing member which face each other across the opening are configured to be sandwiched and connected by a connecting member.

More specifically, insertion holes are provided on both sides of a pair of end portions of the individual electrodes that face each other with the opening interposed therebetween, and the end portions of the fusing member are respectively provided on the upper surface of the end portions of the individual electrodes. And the flat pressing portions of the connecting member are arranged on the upper surfaces of both ends of the fusing member, and the arm portions provided on both sides of the flat portion are inserted through the insertion holes, and the arm portion and the pressing portion are pressed. The end portion of the fusing member and the individual electrode is sandwiched between the parts to connect the fusing member and the individual electrode.

It is preferable that the pressing portion of the connecting member is provided with an uneven portion such as an embossed portion, a tongue-shaped portion, and a recessed portion.

[0018]

[Action]

 Since the fuse plate according to the present invention has the fusing member and the peripheral circuit formed separately as described above, the width and thickness of the fusing member can be set independently of the thickness of the peripheral circuit. The thickness of the peripheral circuit can be set regardless of the width of the fusing member.

When a peripheral circuit having a common electrode and a plurality of individual electrodes is provided on an insulating substrate and an opening is provided in a portion where the individual circuits are arranged in parallel, various capacitors and array patterns of the same substrate can be formed. A fusing circuit can be provided.

Further, since the fusing member is used alone without being attached on the substrate, it is possible to prevent the substrate from smoking or burning due to heat generation of the fusing member.

Since the fusing member and the individual electrode are sandwiched and pressed by the connecting member and the fusing member and the individual electrode are connected to each other, other connecting means, for example, solder, ultrasonic welding, etc. There are less problems due to the effect of heat than when using and welding. That is, since the fusing member and the individual electrode are mechanically connected to each other at room temperature, it is possible to prevent damage due to the influence of heat upon connection.

Further, when a conductive adhesive is used, when the overcurrent flows, the adhesive layer may be carbonized and the desired fusing property may not be obtained. In the present invention, however, as described above, Since the fusing member and the peripheral circuit are mechanically connected by the connecting member, the fusing member is surely blown by a predetermined overcurrent.

[0023]

【Example】

 Next, the present invention will be described in detail based on the embodiments shown in the drawings. 1 to 6 show a first embodiment of a fuse plate of the present invention which constitutes an integrated card fuse. In the fuse plate, an opening 20 is provided in a circuit board 12 having a peripheral circuit 11, and a connecting member is provided. The fusing member 13 is provided over the opening 20 by means of 14.

The circuit board 12 is provided with a peripheral circuit 11 on the upper surface of an insulating substrate 15 made of glass epoxy resin by glass etching using copper foil. The peripheral circuit 11 is arranged from the left side in the figure to the upper side in the figure. The common electrode 17 extends and an individual electrode 18 connected in parallel at the upper part of the common electrode 17 and extending downward in the drawing.

An opening 20 is provided in the center of the portion where the individual electrodes 18 are arranged side by side, and the pair of cut ends 18 a and 18 b of each individual electrode 18 extend to the edge of the opening 20. However, the openings 20 are opposed to each other.

In addition, at the left and right sides of the end portions 18a and 18b of the individual electrode 18 of the insulating substrate 15, insertion of arms 14b and 14b of the connecting member 14 which will be described later has a substantially rectangular cross section. The holes 15a, 15a are provided so as to penetrate from the upper surface to the lower surface.

The fusing member 13 is made of copper foil, and as shown in FIG. 6, has a fusing portion 13a that is fused by a predetermined overcurrent and wide ends 13b and 13b provided on both sides of the fusing portion 13a. I have it. In this embodiment, the fusing parts 13a, 13a are set so that their cross-sectional areas are cut by a current of 1A to 5A. That is, in this embodiment, the thickness T of the fusing parts 13a, 13a is set to 35 μm and the width W is set to 50 μm.

In the fusing member 13, the fusing part 13 a is located on the opening 20, and the ends 13 b and 13 b respectively face the pair of ends 18 a, 18 a of the individual electrodes 18 facing each other with the opening 20 therebetween. It is arranged so as to overlap with the upper surface of 18b, and is clamped and clamped by the connecting member 14, so that the ends 18a, 18b of the individual electrode 18 and the ends 13b, 13b of the fusing member 13 are joined and conducted. .

Specifically, the connecting member 14 is made of a material having conductivity and elasticity. Further, the connecting member 14 has a substantially inverted U-shaped cross section, and forms a flat plate-shaped upper surface portion that presses the end portions 13b and 13b of the fusing member 13 against the end portions 18a and 18b of the individual electrode 18 described above. The pair of arm portions 14b and 14b extend downward from both sides of the pressing portion 14a and are inserted into the insertion holes 15a and 15a provided in the insulating base plate 15 described above. After inserting the arm portions 14b, 14b through the insertion holes 15a, 15a, the portions protruding from the insulating circuit board 15 are pushed by the method described later so as to come into contact with the back surface side of the insulating circuit board as shown in the figure. Bent. Therefore, the tips of the bent and curved arcuate portions 14 c, 14 c come into contact with the back surface side of the insulating substrate 15.

Since the connecting member 14 has the above-described shape, the insulating substrate 15 and the end portions 18a, 18b of the individual electrode 18 are provided between the front end portions of the curved portions 14c, 14c and the pressing portion 14a. Also, the end portion 13b of the fusing member 13 is elastically tightened and pressed, so that the individual electrode 18 and the end portion 13b are connected and electrically connected.

In the present embodiment, the pressing portion 14a is provided with an embossed portion 23, which is a long recess having a substantially trapezoidal cross section and which protrudes to the lower surface side, is continuously provided in the width direction of the fusing member 13. 23 is pushed into the upper surfaces of the end portions 13b and 13b of the fusing member 13. Therefore, the pressing portion 14a can reliably and firmly press and hold the end portion 13b of the fusing member 13 and the individual electrode 18.

The end portion 13b of the fusing member 13 having the above structure and the individual electrode 18 are joined as shown in FIG. The connecting member 14 does not have the curved portion 14c formed at the tip of the arm portion 14b before the end portion 13b is connected to the end portions 18a, 18b by performing the following operation, and the connecting member 14 is not pressed. The embossed portion 23 is not formed on the portion 14a.

The lower die 25 having a pair of recesses 25a, 25a having a semicircular cross section is formed on the surface of the insulating substrate 15 opposite to the surface on which the peripheral circuit 11 is provided. The recesses 25a, 25a are inserted into the insertion holes 15a. , 15a. Next, the arm portions 14b, 14b of the connecting member 14 in which the curved portions 14c, 14c are not formed at the tips are inserted into the insertion holes 15a, 15a, respectively.

On the other hand, the pressing portion 14a side where the above-mentioned embossed portion 23 is not formed is inserted and arranged in the hole portion 26a of the upper die 26. The hole 26a is provided with a protrusion 26b having a shape corresponding to the embossed portion 23 in order to form a desired embossed portion 23 on the pressing portion 14a.

Therefore, when the upper mold 26 is moved toward the lower mold 25 with the arms 14b, 14b being arranged in the insertion holes 15a, 15a as described above, the tips of the arms 14b, 14b are recessed. The curved portions 14c, 14c are formed by moving along the peripheral surfaces of the portions 25a, 25a to match the radiuses of the recesses 25a, 25a. When the upper die 26 is further moved, the pressing portion 14a, the end portion 13b of the fusing member 13, the individual electrode 18 and the insulating substrate 15 are moved between the lower surface of the hole portion 26a of the upper die 26 and the upper surface of the lower die 25. Is pressed. Therefore, the projecting portion 26b pushes the pressing portion 14a onto the upper surface of the end portion 13b of the fusing member 13 to form the embossed portion 23.

As described above, in the first embodiment, the fusing member 13 and the individual electrode 18 are clamped and pressed by the connecting member 14 to connect them, but the connecting member 14 is a stapler. The fusing member 13 and the individual electrode 18 are sandwiched and pressed like a needle, and the curved portion 14c does not necessarily have to be formed at the tip portion of the arm portion 14b, and the insulating circuit board 15 of the arm portion 14b is not necessarily formed. The portion projecting from is bent toward the side of the insulating circuit board 15, so that the pressing portion 14a and the arm portions 14b and 14c sandwich the end portions of the fusing member 13 and the individual electrode 18.

In the fuse plate having the above-mentioned configuration, the fusing member 13 is provided separately from the peripheral circuit 11 provided on the insulating substrate 15, and thus has the following effects. First, since the fusing part 13a is not provided on the insulating substrate 15 but is a separate body, it is possible to prevent the substrate from smoking or burning even when an excessive current flows through the fusing part 13a.

In addition, the peripheral circuit 11 of the insulating substrate 15 can be formed into a fuse array of various patterns by appropriately changing only the fusing member 13 without changing the thickness and the like. The capacity of the fusing member can also be easily changed by replacing the fusing member 13.

On the other hand, the film thickness of the peripheral circuit can be set regardless of the fusing member. Therefore, the film thickness can be increased in order to increase the electric resistance, and a fuse having a large capacity can be integrated. However, it does not hinder the power supply. In addition, when the individual electrodes are used as the contact parts of the connector terminals, a certain thickness or more is required in terms of wear resistance and contact characteristics, and from this point also the thickness of the peripheral circuit can be increased regardless of the fusing member. Is a great advantage.

Further, in the fuse plate configured as described above, the individual electrodes and the fusing member are mechanically connected by the connecting member, and since the connection is performed at room temperature (low temperature process), soldering is performed. It is possible to prevent loss due to the influence of heat generated in the fusing member when connecting them in a high temperature state (high temperature process) involving heat melting such as ultrasonic welding.

In the present invention, the concavo-convex portion of the connecting member 14 is not limited to the embossed portion in the first embodiment, and various modifications are possible.

8 and 9 show a second embodiment of the present invention. In the second embodiment, triangular tongue portions 28, 28 are formed by cutting so as to face the pressing portion 14a of the connecting member 14 in the width direction of the fusing member 13. The tip of this tongue-shaped portion 28 bites into the end portion 13b of the fusing member 13 and penetrates it, and is inserted up to the end portions 18a and 18b of the individual terminal 18.

In the second embodiment, since the tongue-shaped portions 28, 28 bite into the end portions 13b, 13b and the end portions 18a, 18b as described above, the connecting portion 14 is more strongly separated from the fusing member 13 and the melting member 13. The circuit 18 can be connected. Further, since the connecting member 14 is made of a conductive material, the tongue 28 should improve the conductivity between the end 13b of the fusing member 13 and the ends 18a, 18b of the individual terminals 18. You can Since the other structure and operation of the second embodiment are the same as those of the above-mentioned first embodiment, the same members are designated by the same reference numerals and the description thereof will be omitted.

10 and 11 show a third embodiment of the present invention. In the third embodiment, the pressing portion 14a is provided with a plurality of circular recesses 29. Like the embossed portion 23, the recess 29 is pushed into the end portion 13b of the fusing member 13, so that the pressing portion 14a causes the end portion 13b of the fusing member 13 to move to the end portions 18a, 18b of the individual terminals. Can be firmly connected to.

The present invention is not limited to the above-mentioned embodiments, and various modifications can be made. First, the material of the insulating substrate is not limited to the glass epoxy resin described above, but may be, for example, camiphenol, polyimide, PET (polyethylene terephthalanol) or the like.

As the material forming the peripheral circuit, bell, lead, solder or the like can be used in addition to copper. Further, as a method of forming the peripheral circuit, in addition to the method of etching using the metal foil, screen printing, a thin film process and the like can be used. Further, the material of the fusing member is not limited to the above-mentioned copper, and various materials such as bell, lead and solder can be used like the material of the peripheral circuit. Further, the fusing part does not necessarily have to be made of a metal foil, and may be made of a wire material as long as it can be held by the connecting part.

In the above-described embodiment, the pressing portion of the connecting member is provided with uneven portions such as embossed portions, tongue-shaped portions, and recessed portions to firmly join the end portions of the connecting member and the fusing member. The shape of is not limited to the above, and may be any other suitable shape as long as it increases the contact area between the pressing portion and the end portion. Further, the pressing portion may have a smooth plate shape without providing the uneven portion. Further, the material of the connecting member is not limited to the conductive material as described above, and a non-conductive material may be used.

[0048]

[Effect of the device]

 As is clear from the above description, in the fuse plate according to the present invention, the fusing member is provided separately from the peripheral circuit provided on the insulating substrate, and the fusing portion is not provided on the insulating substrate but is a separate body. Therefore, even when an overcurrent flows through a large-capacity fusing member to generate heat, it is possible to prevent the insulating substrate from smoking or burning.

By making the fusing member and the peripheral circuit separate from each other as described above, it is possible to attach a fusing member having a small capacity while keeping the thickness of the peripheral circuit large in order to reduce the electric resistance. Therefore, it is possible to provide the fusing members having various capacities and arrangement patterns on one circuit board.

Further, in the present invention, the fusing member and the peripheral circuit are fastened and connected by the connecting member. Since the fusing member and the peripheral circuit are mechanically connected at room temperature, the fusing The member is not damaged by the heat when it is attached to the peripheral circuit, the designed capacity is obtained, and safety can be secured.

Further, according to the present invention, the pressing portion of the connecting member is provided with an uneven portion such as an embossed portion or a tongue portion so that the end portion of the fusing member and the end portion of the individual electrode of the peripheral circuit constituting the peripheral circuit are connected. It has various advantages such as a more firmly press-fitted connection.

[Brief description of drawings]

FIG. 1 is a plan view showing a first embodiment of the present invention.

FIG. 2 is a bottom view of FIG.

FIG. 3 is an enlarged perspective view of a part III in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a plan view showing a circuit board.

FIG. 6 is a schematic perspective view showing a fusing member.

FIG. 7 is a schematic cross-sectional view showing a method of attaching the fusing member.

FIG. 8 is an enlarged perspective view showing a second embodiment.

9 is a sectional view taken along line IX-IX in FIG.

FIG. 10 is an enlarged perspective view showing a third embodiment.

11 is a sectional view taken along line XI-XI of FIG.

FIG. 12 is a plan view showing a conventional fuse plate.

[Explanation of symbols]

 11 peripheral circuit 12 circuit board 13 fusing member 13a fusing part 13b end part 14 connecting member 15 insulating substrate 17 common electrode 18 individual electrode 18a, 18b end part 20 opening part

Claims (4)

[Scope of utility model registration request] 1. An opening is provided in a circuit board having a peripheral circuit provided on an insulating substrate, and a fusing member that fuses when an overcurrent flows through the opening is provided, and both ends of the fusing member are connected to the peripheral circuit. A fuse plate characterized by being connected. 2. The peripheral circuit includes a common electrode on an insulating substrate and a plurality of individual electrodes connected to the common electrode, the opening is provided at a portion where the individual electrodes are arranged in parallel, and the opening is sandwiched. The fuse plate according to claim 1, wherein a pair of ends of the individual electrodes facing each other are connected by a fusing member to form an integrated card fuse. 3. The fuse plate according to claim 2, wherein a pair of end portions of the individual electrodes facing each other with the opening therebetween and an end portion of the fusing member are sandwiched and connected by a connecting member. 4. An insertion hole is provided on each side of a pair of end portions of the individual electrode facing each other across the opening, and the end portions of the fusing member are arranged on the upper surface of the end portion of the individual electrode, respectively, and connected. The flat pressing portion of the member is arranged on the upper surfaces of both ends of the fusing member, and the arm portions provided on both sides of the flat portion are inserted through the insertion holes, and the arm portion and the pressing portion serve as the fusing member. The fuse plate according to claim 3, wherein the fusing member and the individual electrode are connected to each other by sandwiching the end portion of the individual electrode.