CN103489729A

CN103489729A - Fuse

Info

Publication number: CN103489729A
Application number: CN201310222694.9A
Authority: CN
Inventors: 大坪喜人
Original assignee: Murata Manufacturing Co Ltd
Current assignee: Murata Manufacturing Co Ltd
Priority date: 2012-06-12
Filing date: 2013-06-06
Publication date: 2014-01-01
Also published as: JP2013258013A

Abstract

The invention provides a fuse which can guarantee the joint area and joint force of a conductive part and can reliably prevent reconnection of current paths. The fuse (1) comprises an insulative printed circuit substrate (10), an insulative bump (13), terminal parts (16A and 16B) and a meltable part (15). The bump (13) protrudes from the insulative printed circuit substrate (10). The terminal parts (16A and 16B) comprise deformation parts (21) erecting from the substrate part. The meltable part bonds the terminal parts (16A, 16B) to the bump (13) in such a manner that the deformation parts (21) deform elastically along the bump (13) and become a mutual conducting state.

Description

Fuse

Technical field

The present invention relates to generate heat and melting because of applying of overcurrent, thereby cut off the fuse of current path.

Background technology

General fuse is constituted as to be possessed: the 1st conductive part, the 2nd conductive part and can melt metal section.The end separating that the 1st conductive part and the 2nd conductive part are configured to each other is also opposed.Can melt metal section and be constituted as conducting between the end that makes the 1st conductive part and the 2nd conductive part, and, because of the melting of generating heat that applies of overcurrent, cut off current path.

In such fuse, because melting after the melting of metal section to solidify again, generate metal derby.This metal derby likely is not fixed on substrate or conductive part, and becomes granular clipped wire.In the situation that fuse is installed in framework, if clipped wire moves independently in framework, likely can make clipped wire contact with the 2nd conductive part with the 1st conductive part simultaneously and make current path by moment property reconnect.

So known have a technology (for example,, with reference to patent documentation 1～4) that fuse is configured to the structure that can prevent that clipped wire from contacting with the 2nd conductive part with the 1st conductive part simultaneously.These fuse be configured to make the 1st conductive part, the 2nd conductive part from substrate away from position opposed, and make the 1st conductive part, the 2nd conductive part possess elasticity, thus when current path is cut off the 1st conductive part and the 2nd current-carrying part from.

Fig. 5 means in the existing structure example (with reference to the 3rd embodiment of patent documentation 1) of fuse, the side sectional view of the state that current path is connected.

Fuse 101 shown in Fig. 5 possesses terminal 102A, the 102B as

conductive part.Terminal

102A, 102B at one end possess respectively the spring leaf 103 with conductivity.Spring leaf 103 is consisted of bend 104 and planar portions 105.As shown in the figure, under the state be connected at current path, between terminal 102A and terminal 102B, strains occur in bend 104 and planar portions 105 is closer to each other, by melting metal section 106, between planar portions 105, are engaged.

In this fuse 101, if can melt the apply melting of metal section 106 because of overcurrent, the planar portions 105 be engaged with each other by melting metal section 106 engages and is disengaged, and bend 104 is from the recovering state of strain and planar portions 105 is separated from one another, and current path is cut off.

Patent documentation 1: Japanese Patent Publication 06-033343 communique

Patent documentation 2: TOHKEMY 2002-100272 communique

Patent documentation 3: Japanese kokai publication hei 06-020575 communique

Patent documentation 4: Japanese kokai publication hei 10-134699 communique

The fuse 101 of existing structure, form planar portions 105 by the front end at bend 104, bonding area between portion of

terminal

102A, 102B is increased and guaranteed to maintain the engaging force under the state that makes portion of

terminal

102A, 102B bending.Yet, if planar portions 105 is set, the metal derby that can have a melting is fixed in planar portions 105 and makes the degree of the size of the fixing metal derby of the size reduction in gap of 103 of spring leafs.In addition, also have the quality due to the front end additional plane section 105 at bend 104, the amplitude while therefore vibrating likely becomes large possibility.Therefore, be difficult to reduce to greatest extent spring leaf 103 vibrations and the danger of contact or the danger that clipped wire contacts with 2 spring leafs 103 simultaneously.

Summary of the invention

So the object of the invention is, realizes a kind of bonding area, engaging force that is easy to guarantee conductive part, and can prevent more reliably the fuse that current path reconnects.

Fuse of the present invention possess insulating properties baseplate part, insulating properties protrusion, the 1st conductive part, the 2nd conductive part and can melt section.Protrusion swells from baseplate part.The 1st conductive part and the 2nd conductive part are arranged to erect the mode of coming from baseplate part.The section of can melting, according to making the 1st conductive part and the 2nd conductive part become the mode of the state of mutual conduction, is bonded in protrusion by the 1st conductive part and the 2nd conductive part.

In this forms, become the position of contact of the 1st conductive part and the 2nd conductive part on protrusion, form clipped wire even can melt section's melting, the connecting point position of clipped wire on protrusion stop or the possibility that re-moving to connecting point position also lower.

In addition, owing to can the section of melting making the 1st conductive part and the 2nd conductive part be bonded in protrusion, even can not obtain the 1st conductive part and the aspectant area of the 2nd conductive part, also can guarantee necessary bonding area and engaging force.Therefore, do not need as the structure that planar portions is engaged Face to face illustrating in existing structure, contribute to like this to reduce possibility that current path reconnects and the miniaturization of fuse.

In above-mentioned fuse, preferably, the above-mentioned section of melting, making above-mentioned the 1st conductive part and above-mentioned the 2nd conductive part respectively along under the state of above-mentioned protrusion strain, is bonded in above-mentioned protrusion by above-mentioned the 1st conductive part and above-mentioned the 2nd conductive part.Thus, while being cut off in path, the 1st conductive part and separating of the 2nd conductive part larger, can further reduce the possibility that current path is reconnected.

In above-mentioned fuse, preferably, the 1st conductive part and the 2nd conductive part possess the smooth board that erects to arrange from aforesaid substrate section to the interarea normal direction.Thus, it is large that the strain of the smooth board in the time of can making path be connected becomes, and while being cut off in path, the planar plate of the smooth board of the 1st conductive part and the 2nd conductive part is partly from must be larger.

In above-mentioned fuse, preferably, possess and engage with aforesaid substrate section and form the built-in above-mentioned lid substrate that melts the inner space of section.In this forms, even form clipped wire in the situation that can melt section's melting, also can make this clipped wire be trapped in the inner space that baseplate part and lid substrate form, what prevent to be caused by clipped wire is bad.

In above-mentioned fuse, preferably, the section of can melting consists of electric conductor.At the 1st conductive part and the 2nd conductive part all in the formation of conducting, the loose contact of the 1st conductive part and the 2nd conductive part can not occur via melting section.

In addition, in above-mentioned fuse, preferably, the zone that the wettability of the melted section after protrusion possesses melting is higher.In this forms, even the connecting point position of the 1st conductive part and the 2nd conductive part, away from baseplate part, is also easily sensed the desirable position on protrusion by the part of the melted section after melting.

In addition, in above-mentioned fuse, preferably, possesses the heating electrode that can control febrile state at protrusion.In this forms, make its heating by controlling heating electrode, can make at any time to melt section's melting and cut off current path.In addition, by protrusion, possessing heating electrode, even the connecting point position of the 1st conductive part and the 2nd conductive part away from baseplate part, also can be via protrusion reliably to the heat that can melt section conduction heating electrode.

According to the present invention, by flowing through overcurrent at current path and can the section of melting being melted, make the 1st conductive part and the 2nd conductive part cut off current path from the recovering state of strain, and make to comprise this fuse and the circuit element of the circuit that forms is avoided the impact of overcurrent.And, even form clipped wire by the soluble portions after melting, in addition, even, in the situation that the 1st conductive part and the 2nd conductive part vibrate like this, also can reduce significantly the possibility that current path is reconnected.

The accompanying drawing explanation

Fig. 1 is the side sectional view of the fuse of the 1st execution mode.

Fig. 2 means the side sectional view of manufacture process of the fuse of the 1st execution mode.

Fig. 3 is the side sectional view of the fuse of the 2nd execution mode.

Fig. 4 is the cutaway view of the fuse of the 3rd execution mode.

Fig. 5 is the side sectional view of existing fuse.

Description of reference numerals:

1,31,41 ... fuse; 10 ... tellite;

11 ... the lid substrate; 12A, 12B, 43 ... wiring section;

13 ... protrusion; 14 ... central authorities' adhesive portion;

15 ... can melt section; 16A, 16B ... terminal component;

17A, 17B ... the two ends adhesive portion; 21 ... variant part;

22 ... fixed part; 23 ... clipped wire;

24 ... metal derby; 32 ... induction electrode;

42 ... heating electrode.

Embodiment

(the 1st execution mode)

Below, with reference to the fuse of Fig. 1,2 pairs of the 1st execution modes of the present invention, describe.Below, the parts to conductivity in the accompanying drawing described adopt the shade mark, and the parts of insulating properties adopt the some souvenir.In addition, the figure upside in Fig. 1 is called to top surface side, the figure downside is called to bottom surface side and describes.

Fig. 1 (A) means the side sectional view when current path of the fuse of the 1st execution mode is connected.The fuse 1 of present embodiment possesses: tellite 10, the lid substrate 11, the 12A of wiring section, 12B, protrusion 13, central adhesive portion 14, can melt section 15,

terminal component

16A, 16B and two ends

adhesive portion

17A, 17B.

Tellite 10 is the baseplate parts in present embodiment, glass cloth base material epoxy resin, consists of.This tellite 10 has rectangular end face and bottom surface, is the flat parts of the thinner thickness between end face and bottom surface.Lid substrate 11 is identical with tellite 10, glass cloth base material epoxy resin, consists of.This lid substrate 11 is the parts with lid shape that is formed with the bottom surface that bottom opening is arranged that rectangular end face and profile be rectangle.The end face of tellite 10 is bonded with each other with the bottom surface of lid substrate 11, and thus, tellite 10 forms the framework with inner space with lid substrate 11.

In addition, so long as there is insulating properties, can adopt other material outside glass cloth base material epoxy resin as the material of tellite 10 and lid substrate 11.For example, can adopt ceramic substrate, glass substrate and other resin substrate etc.

The 12A of wiring section, 12B are formed at tellite 10 separately discretely, and have: the copper electrode of rectangle that is formed on the end face of tellite 10; Be formed on the rectangle copper electrode of the bottom surface of tellite 10; The copper electrode that makes to be formed on the end face of tellite 10 and bottom surface with connecting tellite 10 each other conducting cross pore electrod.

In addition, form fuse 1 as surperficial actual load shape parts here, but in addition also can be used as the what is called that possesses the terminal outstanding from framework, insert the shape parts and form.Therefore, the shape of the 12A of wiring section, 12B is not limited to above-mentioned shape.In addition, the material of the 12A of wiring section, 12B also is not limited to above-mentioned material.

Protrusion 13 is looked and is shaped as semicircular insulative resin material and is formed by section, and is configured in the zone between the 12A of wiring section, 12B according to the mode of the end face protuberance that makes tellite 10.

In addition, as the material of protrusion 13, so long as the material that has insulating properties and easily engage with tellite 10 can adopt other materials outside the insulative resin material.In addition, as the shape of protrusion 13, can be also to look except section other shapes such as rectangle that are shaped as semicircle.

Central authorities' adhesive portion 14 is bonded near the top of top surface side of protrusion 13, thereby can melt section 15, is bonded in protrusion 13.Central authorities' adhesive portion 14 can consist of the institutes such as bonding agent of insulating properties also and can consist of institutes such as the bonding agent of conductivity, soldering alloys.In the situation that form central adhesive portion 14 by soldering alloy, central adhesive portion 14 also can be by for example, than melting low-melting-point metal (the Sn-3.5Ag-0.5Cu alloy that, solid phase fusing point be 215 ℃ of section 15 in lower temperature melting.) etc. institute form.In addition, melting section 15 directly during bonding (welding) situation at protrusion 13, also central adhesive portion 14 can be set.

Can melt section 15 overlapping and be engaged in protrusion 13 via central adhesive portion 14 in the top surface side of central adhesive portion 14.In addition, in the situation that central adhesive portion 14 consisted of low-melting-point metal, can melt section 15 and also can for example, be formed by the institutes such as low-melting-point metal (the Sn-10Sb alloy that, the solid phase fusing point is 245 ℃) than the melting under high temperature more of central adhesive portion 14.

Two ends

adhesive portion

17A, 17B are bonded on the end face of the 12A of wiring section, 12B.These two ends

adhesive portion

17A, 17B for

terminal component

16A, 16B and the 12A of wiring section, 12B engage and conducting arranges.Therefore, two ends

adhesive portion

17A, 17B consist of institutes such as the bonding agent with conductivity, scolding tin.In addition, in the situation that central adhesive portion 14 is consisted of low-melting-point metal, two ends

adhesive portion

17A, 17B also can by with central adhesive portion 14 uniform temps under the institutes such as low-melting-point metal (the Sn-3.5Ag-0.5Cu alloy that for example, the solid phase fusing point is 215 ℃) of melting form.

Terminal component 16A is the 1st conductive part in present embodiment, is configured between the 12A of wiring section and protrusion 13.Terminal component 16B is the 2nd conductive part in present embodiment, is configured between the 12B of wiring section and protrusion 13.

Terminal component

16A, 16B are looked and are shaped as the roughly metal of the one of L word shape and are formed by section respectively, and possess variant part 21 and fixed part 22.Variant part 21 and fixed part 22 are formed separately for the beam shape and in mutually orthogonal mode and link.One end of fixed part 22 is attached at the side of variant part 21, and the other end is bonded on tellite 10 via two ends adhesive portion 17A, 17B.Variant part 21 is the smooth boards in present embodiment, with near the end point of contact of fixed part 22, with the end face of tellite 10, contacts, and the other end is via melting section 15 and central adhesive portion 14 is engaged in protrusion 13.This variant part 21 starts to extend configuration to normal direction from the end face of tellite 10, keeps the state according to the mode strain to protrusion 13 lateral bends.

This fuse 1 is such as by soldering, actual load is at circuit substrate that element etc. is installed etc., and the 12A of wiring section, 12B are connected with the wiring pattern on circuit substrate.And, form current path by making the 12A of wiring section and the 12B of wiring section via melting section's 15 conductings.

Fuse 1 should be cut off because of the overcurrent current path flow through more than certain value between the 12A of wiring section, 12B.Therefore, the large mode of resistance value according to central adhesive portion 14,

terminal component

16A, 16B forms material and the shape (line width) that can melt section 15.

Fig. 1 (B) means the side sectional view when current path of the fuse of the 1st execution mode is cut off.

For fuse 1, if flow through the above overcurrent of certain value between the 12A of wiring section, 12B, can melt section's 15 spontaneous heatings, and can melt section's 15 meltings.Owing to can melting section's 15 meltings, via terminal component 16A, the 16B that can melt section 15 and be bonded on protrusion 13, from elastic deformation, recover, the variant part 21 of

terminal component

16A, 16B is away near the top of protrusion 13 and become the state that is separated from each other larger distance.Thus, the current path between the 12A of wiring section, 12B is cut off.

Soldering

alloy

14,15 after melting almost all has the surface infiltration diffusion of infiltrating

terminal component

16A, 16B with

soldering alloy

14,15, and the fixed part 22 be trapped in

terminal component

16A, 16B grades with the bight that variant part 21 intersects, and become metal derby 24, be fixed on terminal component 16A, 16B.In addition, the part of the

soldering alloy

14,15 after melting is in protrusion 13, tellite 10 tricklings, because the wettability of protrusion 13 and tellite 10 is lower and can invasion, because self surface tension becomes granularly and curing, as the clipped wire 23 that is independent of miscellaneous part, at the framework internal freedom, move.

In this fuse 1, because

terminal component

16A, 16B can immediate position be near the top of protrusion 13, so, even clipped wire 23 moves freely, clipped wire 23 may not arrive near the top of protrusion 13.And, because terminal component 16A separates greatlyr with terminal component 16B, so reduce significantly the danger that clipped wire 23 contacts with terminal component 16B with terminal component 16A simultaneously.In addition, even apply vibration and make

terminal component

16A, 16B vibration to fuse 1, but because terminal component 16A separates greatlyr with terminal component 16B, so also reduced significantly the danger that terminal component 16A and terminal component 16B are in contact with one another.

In addition, to make terminal component 16A separate greatlyr with terminal component 16B in order being cut off in path, to make terminal component 16A and terminal component 16B strain significantly in the time of need to being connected in path.Bonding area and engaging force required while therefore, being connected in path are larger.In the fuse 1 of above-mentioned formation, owing to via melting section 15 and central adhesive portion 14, making terminal component 16A and terminal component 16B be adhered to protrusion 13, even therefore terminal component 16A and terminal component 16B are not aspectant, also can guarantee necessary bonding area and engaging force.Thus,

terminal component

16A, 16B do not need the such planar portions of the fuse of existing structure, contribute to reduce possibility that the current path of fuse 1 reconnects and the miniaturization of fuse 1.

Next, an example of the manufacture method of fuse 1 described.Fig. 2 is the side sectional view that periodically means the manufacturing process of fuse 1.

In the manufacturing process of fuse 1, at first, in the operation shown in Fig. 2 (A), prepare tellite 10, and form the 12A of wiring section, 12B.

Next, in the operation shown in Fig. 2 (B), prepare the insulative resin parts of the preshaped shape for regulation.Then, the zone of the regulation on the end face of tellite 10 applies the heat-curing resin cream (not shown) of bonding use.Next, paste the insulative resin parts on this heat-curing resin cream.Then, by use oven etc. under 180 ℃ by tellite 10 heating about 60 minutes, heat-curing resin cream solidifies, and thus, at tellite 10, forms protrusions 13.

In addition, in the operation shown in Fig. 2 (C), preparing preshaped is terminal component 16A, the 16B of regulation shape.And, so that the mode be connected between the variant part 21 of terminal component 16A and terminal component 16B, solder terminal parts 16A and terminal component 16B and form and can melt section 15.

Next, in the operation shown in Fig. 2 (D), to melting section 15, adhere to bonding agent, the soldering paste as central adhesive portion 14, in addition, adhere to as two ends adhesive portion 17A, the bonding agent of 17B, soldering paste to the fixed part 22 of terminal component 16A, 16B.Then, with fixture, be configured on tellite 10 making under the state of its

strain terminal component

16A, 16B and can melt section 15, make to melt section 15 and be bonded in protrusion 13 via central adhesive portion 14, make fixed part 22 be bonded in the 12A of wiring section, the 12B of tellite 10 via two ends

adhesive portion

17A, 17B.

Now, in the situation that form central adhesive portion 14 and two ends

adhesive portion

17A, 17B by soldering paste, use reflow ovens etc. is heated tellite 10.Heating-up temperature now can be that not melting can be melted section 15 but the such temperature (medium temperatures between 215 ℃ and 245 ℃) of melting soldering paste (central adhesive portion 14 and two ends

adhesive portion

17A, 17B).In addition, at 70 ℃ of base-plate cleanings of implementing about 10 minutes, remove the solder flux that is included in soldering paste after this operation.

Next, as shown in Fig. 2 (E), preparing preshaped is the lid substrate 11 of regulation shape.Then, apply the heat-curing resin cream of bonding use at tellite 10.Next, lid substrate 11 sticks on heat-curing resin cream.Then, by use oven etc. at 180 ℃ by tellite 10 heating about 60 minutes, heat-curing resin cream is cured thus.Thus, lid substrate 11 is bonded on tellite 10.

Manufacture fuse 1 by such operation.In addition, the shown here manufacture method is only an example, and concrete manufacture method can be also above-mentioned method in addition.For example, also can be by resinous wood being potted in to tellite etc. and shaping protrusion 13.In addition, except use bonding agent etc. after shaping, be bonded on tellite 10, also can be after

terminal component

16A, 16B be arranged on to tellite 10, directly solder

terminal parts

16A, 16B and protrusion 13 and form and can melt section 15.

In addition, the shape that shown here forms each one of fuse 1 is only an example, and concrete shape can be also above-mentioned shape in addition.For example,

terminal component

16A, 16B can not be also that section is the L word shape, but section is I word shape etc.

(the 2nd execution mode)

Below, the fuse of the 2nd execution mode of the present invention is described.

Fig. 3 means the side sectional view when current path of the fuse of the 2nd execution mode is cut off.

The fuse 31 of present embodiment, except the parts identical with aforementioned fuse 1, also possesses induction electrode 32.Induction electrode 32 is to be formed on protrusion 13 with the non-electric-connecting mode of the 12A of wiring section, 12B, and for the melted section by after melting 15 is induced to the assigned position on protrusion 13, the material higher by the wettability that can melt section 15 formed.

Function part can be as this induction electrode 32 protrusion 13 setting, that can affect the clipped wire that can melt section 15, the metal derby formed by the melting that can melt section 15, be formed by the melting that can melt section 15 etc., even the connecting point position of

terminal component

16A, 16B in from tellite 10 away from the top of protrusion 13 near, also can respond to the possibility that the current path that reduces fuse 31 is reconnected.

(the 3rd execution mode)

Below, the fuse of the 3rd execution mode of the present invention is described.

Fig. 4 (A) means the side sectional view when current path of the fuse of the 3rd execution mode is cut off.In addition, Fig. 4 (B) be the 3rd execution mode fuse observe from top surface side the section plan of using the face shown in B-B ' dotted line Fig. 4 (A).

The fuse 41 of present embodiment, except the parts identical with aforementioned fuse 1, also has heating electrode 42, wiring section 43 and dielectric film 44.Heating electrode 42 is formed on protrusion 13, and with the 12A of wiring section, 12B non-electric-connecting be set up, by energising, generated heat, and then not shown to melting the 15(of section) heating and make its melting.Wiring section 43 is formed with heating electrode 42 conductings and with the control circuit of external substrate and is connected, and makes heating electrode 42 energisings constantly arbitrarily.Dielectric film 44 is formed and covers heating electrode 42, thereby it is not shown to make to melt the 15(of section) with heating electrode 42 between insulate.Preferably, the insulating properties material that this dielectric film 44 is higher by thermal conductivity forms.

By these heating electrodes 42, wiring section 43, dielectric film 44 are such, can the function part that can melt section 15, the metal derby formed by the melting that can melt section 15, clipped wire etc. and affect be arranged on protrusion 13, even near the top of the connecting point position of

terminal component

16A, 16B in the protrusion 13 away from tellite 10, also can realize the multifunction of fuse 41.

In addition, can also on the fuse 41 of present embodiment, further combine the formation of fuse 31 of the execution mode of front, heating electrode 42 grades and induction electrode 32 are set respectively.Like this, can suitably change the design of the concrete formation of fuse of the present invention, the described effect of above-mentioned execution mode has only exemplified the effect of the best that can be produced by the present invention, and the effect produced by the present invention is not limited to the described effect of above-mentioned execution mode.

Claims

1. a fuse is characterized in that possessing:

The baseplate part of insulating properties;

The protrusion of insulating properties, it swells from described baseplate part;

The 1st conductive part and the 2nd conductive part, they are arranged to erect the mode of coming from described baseplate part respectively; And

Can melt section, it,, according to making described the 1st conductive part and described the 2nd conductive part become the mode of the state of mutual conduction, is adhered to described protrusion by described the 1st conductive part and described the 2nd conductive part.

2. fuse according to claim 1, is characterized in that,

The described section of melting, making described the 1st conductive part and described the 2nd conductive part respectively along under the state of described protrusion strain, is adhered to described protrusion by described the 1st conductive part and described the 2nd conductive part.

3. fuse according to claim 1 and 2, is characterized in that,

Possess the substrate of lid, this lid substrate engages with described baseplate part and forms built-in described inner space of melting section.

4. according to the described fuse of any one in claim 1～3, it is characterized in that,

The described section of melting consists of electric conductor.

5. according to the described fuse of any one in claim 1～4, it is characterized in that,

The described induction electrode that melts section's invasion after the surface of described protrusion possesses melting.

6. according to the described fuse of any one in claim 1～5, it is characterized in that,

Possesses the heat-generating units that can control febrile state at described protrusion.