CN106158240A

CN106158240A - Coil block and manufacture method thereof

Info

Publication number: CN106158240A
Application number: CN201510165877.0A
Authority: CN
Inventors: 李英旼; 安德振
Original assignee: Samsung Electro Mechanics Co Ltd
Current assignee: Samsung Electro Mechanics Co Ltd
Priority date: 2014-10-10
Filing date: 2015-04-09
Publication date: 2016-11-23
Also published as: KR20160042560A

Abstract

A kind of coil block and manufacture method thereof are provided.Described coil block includes: at least one plate coil；Bobbin, including being wound around space and portion of terminal, plate coil is arranged in described winding space, and external connection terminals is fastened to described portion of terminal, and the leading part of plate coil is attached to external connection terminals；Core, is attached to bobbin.Plate coil and external connection terminals are bonded to each other by conductive adhesive.

Description

Coil block and manufacture method thereof

This application claims on October 10th, 2014 submit in Korean Intellectual Property Office The priority of 10-2014-0136631 korean patent application and rights and interests, the disclosure of this application is by drawing With being incorporated herein.

Technical field

It relates to a kind of have the size significantly reduced the coil block that can be easily manufactured and Its manufacture method.

Background technology

Electric supply installation is usually provided with for exchange (AC) electricity is converted into the coil that direct current (DC) is electric Assembly, i.e. transformator.Transformator according to prior art be generally of coil be wrapped on bobbin and Core is attached to the structure of bobbin.

In order to improve the efficiency of coil block, it is important that reduce the loss produced in the coil of coil block. To this end, reduce coil resistance, improve coil thermal radiation property and insulation characterisitic etc. that design improves is the most complete Portion is considered.

Specifically, in the case of the high electric currents of several amperes to tens amperes are applied to coil block, The waste produced in the conductor of coil can be high, thus only by common wire type covered wire Circle, can be difficult to reduce loss.

Summary of the invention

The one side of the disclosure can provide one can be applied with high electric current or powerful have undersized line Coil assembly.

The one side of the disclosure may also provide a kind of method manufacturing coil block, and described method is easy to manufacture Coil block.

According to the one side of the disclosure, a kind of coil block comprises the steps that at least one plate coil；Coil Frame, including being wound around space and portion of terminal, plate coil is arranged in described winding space, external connection terminal Son is fastened to described portion of terminal, and the leading part of plate coil is attached to external connection terminals；Core, is attached to Bobbin.Plate coil and external connection terminals can be bonded to each other by conductive adhesive.

According to another aspect of the present disclosure, a kind of coil block comprises the steps that at least one plate coil；Line Coil, including multiple external connection terminals, plate coil is attached to the plurality of external connection terminals, its In, plate coil is electrically connected to outside by external connection terminals.

According to another aspect of the present disclosure, a kind of method manufacturing coil block comprises the steps that coil of wire It is wrapped on bobbin；Plate coil is attached to bobbin；The outside of plate coil and bobbin is connected Connecting terminal is bonded to each other；Iron core is attached to bobbin.

Accompanying drawing explanation

By the detailed description carried out below in conjunction with the accompanying drawings, the above and other aspect of the disclosure, feature and Other advantages will be more clearly understood, in the accompanying drawings:

Fig. 1 is the perspective view of the coil block schematically showing the exemplary embodiment according to the disclosure；

Fig. 2 is the decomposition diagram of the coil block shown in Fig. 1；

Fig. 3 is the top view of the coil block schematically showing Fig. 1；

Fig. 4 is the sectional view of the line A-A ' intercepting along Fig. 3；

Fig. 5 is the view of the welding procedure for describing the coil block shown in Fig. 1；

Fig. 6 is the regarding of coil block schematically showing the another exemplary embodiment according to the disclosure Figure；And

Fig. 7 is the decomposition diagram of the coil block shown in Fig. 6.

Detailed description of the invention

The exemplary embodiment of the disclosure is described in detail with reference to the accompanying drawings.

But, the disclosure can embody with the most different forms, should not be construed as being limited to Embodiment set forth herein.Exactly, it is provided that these embodiments so that the disclosure will be thoroughly and Complete, and the disclosure will be fully conveyed to those skilled in the art the scope of the present disclosure.

In the accompanying drawings, for clarity, the shape and size of element can be exaggerated, and phase will be used all the time Same label represents same or analogous element.

Fig. 1 is the perspective view of the coil block schematically showing the exemplary embodiment according to the disclosure；Figure 2 is the decomposition diagram when eliminating coil of wire of the coil block shown in Fig. 1.It addition, Fig. 3 is the coil block the schematically showing Fig. 1 top view when eliminating core；Fig. 4 is along figure The sectional view that the line A-A ' of 3 intercepts.

First, with reference to Fig. 4, can be to install according to the coil block 100 of the exemplary embodiment of the disclosure High-power and high current transformer in electric supply installation, and coil block 100 can include bobbin 10, core 40 and coil 50.

Bobbin 10 can form the whole main body of coil block 100.Bobbin 10 can be held by injection moulding Change places manufacture, but be not limited to this.It addition, the bobbin 10 according to this exemplary embodiment can be by insulating Resin formation and can being formed by the material with high-fire resistance and high proof voltage.

The example of the material of bobbin 10 can include polyphenylene sulfide (PPS), liquid crystal polyester (LCP), Polybutylene terephthalate (PBT) (PBT), polyethylene terephthalate (PET) and phenolic aldehyde tree Fat etc..

With reference to Fig. 2 and Fig. 4, bobbin 10 can include that coil 50 is wrapped in wound portion 12 thereon and is formed Portion of terminal 20 at the end of wound portion 12.

Wound portion 12 can include in tubular main part 13 with from one end of main part 13 along external diameter direction The pedestal 17 extended.

Main part 13 can include through hole 11 formed therein and form on its outer circumferential surface Individual or more partition walls 15 and 16, wherein, core 40 is partially inserted in through hole 11, partition wall 15 With the 16 winding spaces separating coil 50.Here, coil 50 can be wrapped in by partition wall 15 and 16 In each space separated.

Winding space according to this exemplary embodiment can be by partition wall 15 and 16 and pedestal 17 points Separate.It addition, partition wall 15 and 16 can include the first partition wall 16 and the second partition wall 15.

First partition wall 16 may be provided at the top of the pedestal 17 being described below, and first is wound around space May be formed between the first partition wall 16 and pedestal 17.

Second partition wall 15 may be provided at the top of the first partition wall 16.Therefore, the second winding space can It is formed between the first partition wall 16 and the second partition wall 15.

It addition, the second partition wall 15 is not formed in the end of main part 13, but may be formed at and main body The end in portion 13 separates the position of preset distance.Therefore, a part for main part 13 can separate second Highlighting on the top of wall 15, the 3rd is wound around space can be formed at second by the ledge of main part 13 The top of partition wall 15.

The plate coil 55 being described below may be provided in the 3rd winding space.Therefore, except master Outside body 13, multiple fixed projections 18 also can highlight on the upper surface of the second partition wall 15 so that Plate coil 55 is laid securely.

Fixed projection 18 may be configured as suppressing plate coil 55 in the surface direction of the second partition wall 15 Motion.Therefore, fixed projection 18 can highlight between plate coil 55, and if it is necessary to Fixed projection 18 can highlight according to the height of the thickness equal to or more than plate coil 55.

Fixed projection 18 can be formed according to linear or arc according to the shape of flat type coil 55.So And, the disclosure is not limited to this.That is, fixed projection can be according to variously-shaped formation, as long as it can be effective The motion of suppression plate coil 55.

Meanwhile, primary winding can be wrapped in as above first and be wound around in space, and secondary coil can twine It is wound on as above second to be wound around in space.Therefore, insulate in order to ensure between above-mentioned coil, the One partition wall 16 can be formed according to the area corresponding with the area of pedestal, and the second partition wall 15 can be according to little Area in the area of the first partition wall 16 is formed.

Partition wall 15 and 16 can be formed according to various thickness and can be formed by various materials, if partition wall 15 and 16 forms that can keep them.Although it addition, the most in the present example embodiment to show The mode of example describes the situation that partition wall 15 and 16 forms with bobbin 10, but the disclosure It is not limited to this, but can differently be applied.Such as, partition wall 15 and 16 may be alternatively formed to and coil Frame 10 is separately then attached to the component of bobbin 10.

Pedestal 17 can highlight according to the form extended along external diameter direction from the bottom of main part 13, and can Support and be wrapped in the coil 51 in the first winding space.Therefore, pedestal 17 can according to the first partition wall The area that the area of 16 is corresponding is formed.

Portion of terminal 20 may be formed at the two ends of pedestal 17.

Portion of terminal 20 according to this exemplary embodiment can be block-shaped according to highlight down from pedestal 17 Formed.But, the disclosure is not limited to this.That is, portion of terminal 20 also can highlight from the side surface of pedestal 17.

Meanwhile, with reference to Fig. 4, owing to the portion of terminal 20 according to this exemplary embodiment has from pedestal 17 The form partly extended, therefore can be difficult to clearly distinguished from each other to pedestal 17 and portion of terminal 20. Therefore, it also is understood as pedestal 17 itself according to the portion of terminal 20 of this exemplary embodiment.

External connection terminals 30 can be fastened to portion of terminal 20 according to the form highlighted outwardly from portion of terminal 20. External connection terminals 30 can have pin-shaped shape, and wherein, one end of external connection terminals 30 is fastened to terminal The side surface in portion 20, the other end of external connection terminals 30 bends and highlights the most in long way.But, External connection terminals 30 is not limited to have above-mentioned shape, but can be according to the shape of coil block or structure Or the structure of the plate that coil block is mounted thereto and have variously-shaped.

Portion of terminal 20 according to this exemplary embodiment can include the first terminal portion 20a and the second portion of terminal 20b。

The first terminal portion 20a can be the coil of wire 51 in the multiple coils being described below and line Circle 53 is wrapped in portion of terminal 20 thereon, and the second portion of terminal 20b can be that plate coil 55 is connected to it Portion of terminal 20.

The lead-in wire with lead format of coil 51 and 53 may be connected to be fastened to the first terminal portion 20a's External connection terminals 30.It addition, in this exemplary case of the embodiment, primary winding can only include Coil of wire 51, secondary coil can include both coil of wire 53 and plate coil 55.

Therefore, according to this exemplary embodiment, the coil of wire 53 2 of primary winding 51 and secondary coil Person may be connected to the first terminal portion 20a.

To this end, as shown in Figure 3, the external connection terminals 30 of the first terminal portion 20a may be logically divided into outside Connecting terminal 30c and external connection terminals 30a, wherein, primary winding is connected to external connection terminals 30c, The coil of wire 53 of secondary coil is connected to external connection terminals 30a.It addition, be connected to primary winding External connection terminals 30c and be connected to the external connection terminals 30a of secondary coil and can be set to separately Insulation distance or farther distance, so that insulating therebetween.

Second portion of terminal 20b may be provided at the opposition side of the first terminal portion 20a, and can include multiple outside Connect terminal 30b and guide part 34.

The external connection terminals 30b of the second portion of terminal 20b can be according to the side surface from the second portion of terminal 20b The form prominent along the surface direction of pedestal 17 is fastened to the second portion of terminal 20b.Therefore, below will The leading part L of plate coil 55 to be described can easily contact and be attached to external connection terminals 30.

At least one guide part 34 may be formed at the second portion of terminal being fastened with external connection terminals 30b On the side surface of 20b, and can have the form highlighted from the second portion of terminal 20b.

Guide part 34 can be arranged to suppress the motion (will be detailed below being described) of plate coil 55. To this end, guide part 34 can include from the prominent separate part 35 of portion of terminal 20 and from the end of separate part 35 The extension 36 extended according to the form of the area extending separate part 35.

Therefore, with reference to Fig. 3, on top view, guide part 34 can be formed according to T-shaped.

It addition, guide part 34 may be provided at two external connection terminals 30b being disposed adjacent to each other it Between.Therefore, at least one external connection terminals 30b may be provided between two guide parts 34.

The leading part L of the plate coil 55 being described below may be provided at two be disposed adjacent to each other Between individual guide part 34 and can be coupled to external connection terminals 30b.Therefore, lead for two described above The interval between the separate part 35 in the portion 34 width width than the leading part L of plate coil 55, guides The interval D (see Fig. 3) between the extension 36 in portion 34 width than the leading part L of plate coil 55 Narrow.

Therefore, can the lead-in wire of restraint measure plate coil 55 between guide part 34 by extension 36 Portion L excessively moves along the direction of arrow shown in Fig. 4.

Simultaneously as be set to suppress plate coil 55 according to the guide part 34 of this exemplary embodiment The motion of leading part L, therefore guide part 34 can be made only in the leading part L of plate coil 55 and be arranged on it On the second portion of terminal 20b on.

But, if it is necessary to be arranged on the first terminal portion 20a at the leading part L of plate coil 55 In the case of on, guide part 34 may also be arranged on the first terminal portion 20a.

Coil 50 can be wound around or be arranged in the winding space of bobbin 10, and can include first coil portion 51 and second coil portion 53 and 55.

Here, first coil portion 51 can be primary winding, and the second coil portion 53 and 55 can be secondary Coil.

Each in first coil portion 51 and the second coil portion 53 and 55 includes being electrically insulated from each other Multiple single coils.In the present example embodiment, the second coil portion 53 and 55 can include multiple single Coil 53 and 55.

It addition, first coil portion 51 can only include that coil of wire, the second coil portion 53 and 55 can include cloth Line coil 53 and plate coil 55.But, the structure of the disclosure is not limited to this.

Coil of wire 51 and 53 can be formed according to the form of wire wound, and can be wrapped in as above First is wound around space and second is wound around in space.

Plate coil 55 can be formed by the conductive material with rigidity and be had flat surfaces, plate coil 55 can be formed according to fixed form and may be provided in the 3rd winding space.

Here, plate coil 55 can carry out shape by the stalloy with electric conductivity performs pressure processing Become.

It addition, with reference to Fig. 4, plate coil 55 may be logically divided into and is arranged in the 3rd winding space and has The coil pattern portion P of coil shape and coil pattern portion is connected to the leading part of external connection terminals 30 L.Here, coil pattern portion P and leading part L can be separated from each other based on the sweep of plate coil 55.

Coil pattern portion P may be provided in the 3rd winding space and may be provided at and is formed at the second partition wall Between fixed projection 18 on 15.Can suppress plate coil 55 in surface direction by fixed projection 18 Motion.

Leading part L can be from the circuit diagram arranged along horizontal direction (surface direction of the second partition wall) Case portion P extends along vertical direction, and can have the end being attached to external connection terminals 30.

It addition, as depicted in figs. 1 and 2, leading part L can have the engagement groove 56 being formed at its end. Engagement groove 56 is formed as making the end of leading part L and external connection terminals 30 the most easily combine, And prevent the end of leading part L after the end of leading part L and external connection terminals 30 are bonded to each other It is easily separated each other with external connection terminals 30.To this end, engagement groove 56 can be enough to make outside by having The groove connecting the size and dimension that terminal 30 is plugged into is formed.

It addition, leading part L is not at the state contacted the most simply with external connection terminals 30, and It is can be bonded to each other by the conductive adhesive (not shown) of such as solder.

Meanwhile, in the present example embodiment, plate coil 55 can include two single coil 55a And 55b.But, the structure of the disclosure is not limited to this, but can another shows as will be described Example embodiment carries out different amendments like that.Equally, although describe two the most by way of example In secondary coil, only one coil of wire 53 includes the situation of single coil, but the disclosure is not limited to this. That is, if it is necessary to the coil of wire 53 of secondary coil can include multiple single coil.

It addition, common insulated coil (such as, polyurethane line) etc. can be used or by several strands of afterturn The twisted pair coil that line (such as, litz wire etc.) is formed is as the cloth according to this exemplary embodiment Line coil 51 and 53.Alternatively, can use there are multiple insulated coils (such as, three of high-insulativity Layer covered wire (TIW)).That is, if it is necessary to may select certain coil.

Core 40 can be partially inserted in the through hole 11 being formed in bobbin 10 and can electromagnetic combination arrive Coil 50 is to form magnetic circuit.

Core 40 according to this exemplary embodiment can construct in couples.A pair core 40 can be partially inserted into In the through hole 11 of bobbin 10, thus it is bonded to each other to contact with each other.According to its shape, core 40 is permissible It is ' EE ' core, ' EI ' core, ' UU ' core or ' UI ' core etc..

Core 40 can by have compared with other material high magnetic permeability, low-loss, high saturation magnetic flux density, The Mn-Zn based ferrite of high stability and low production cost is formed.But, exemplary in the disclosure In embodiment, shape or the material of core 40 are not limited to this.

It follows that reference Fig. 4 and Fig. 5 to be described the manufacture coil block according to this exemplary embodiment Method.

First, as shown in Figure 4, coil of wire 51 and 53 can be wrapped in bobbin 10.Here, Coil of wire 51 and 53 can include coil of wire 51 and the wiring line of the second coil portion of first coil portion Both circles 53.Therefore, coil of wire 51 and 53 can be wrapped in the first winding space and second and be wound around space In.

In the process, coil of wire 51 can be automatically wound around by automatic winding apparatus (not shown) With 53.

It follows that plate coil 55 can be attached to the 3rd winding space of bobbin 10.Here, may be used The leading part L of plate coil 55 is placed between guide part 34 adjacent one another are, can be by external connection terminal Son 30 is inserted in the engagement groove 56 (see Fig. 1) of leading part L.

Then, as it is shown in figure 5, welding procedure can be performed.Welding procedure can be will be combined with flat It is same that the external connection terminals 30 of board coil 55 is immersed in the lead bath groove 90 accommodating melting solder 92 Time apply the technique of solder 92 of fusing.Can be by this technology utilization conductive adhesive by external connection terminal Son 30 and coil 50 are bonded to each other strongly.

This technique can be applied to be combined with the external connection terminals 30 of plate coil 55 and connection has cloth Both external connection terminals 30 of line coil 51 and 53.

Then, core 40 can be attached to bobbin 10, with complete shown in Fig. 1 according to this is the most exemplary The coil block of embodiment.

Owing to the coil block 100 according to this exemplary embodiment described above includes plate coil 55, therefore, coil block 100 can be applied in high-power and high electric current, and can have the hot spoke of improvement Penetrate characteristic and insulation characterisitic.

Even if it addition, coil block 100 includes plate coil 55, it also can be by having pin-shaped shape External connection terminals 30 is arranged on mainboard.Therefore, the leading part L of plate coil 55 need not directly It is attached to mainboard, thus coil block can be easily installed.

Further, since plate coil 55 and external connection terminals 30 are tied the most jointly by conductive adhesive Close, therefore can be easily manufactured coil block.

Meanwhile, it is not limited to above-mentioned exemplary embodiment according to the coil block of the disclosure, if necessary Words, described coil block can differently be applied.

Fig. 6 is the regarding of coil block schematically showing the another exemplary embodiment according to the disclosure Figure, for convenience of description, eliminates core.It addition, Fig. 7 is the decomposition of the coil block shown in Fig. 6 Perspective view.

With reference to Fig. 6 and Fig. 7, according to the coil block 200 of this exemplary embodiment and according to above-mentioned example The difference of the coil block of property embodiment is the structure of plate coil 55.Therefore, by omission to upper State the detailed description constructing identical structure of exemplary embodiment, will mainly describe exemplary with above-mentioned The different structure of structure of embodiment.

The plate coil of the coil block 200 according to this exemplary embodiment can include multiple single line Circle 55a, 55b, 55c and 55d, in them, the single coil of at least two can be according to the form knot of stacking Close bobbin 10.

It addition, the second partition wall 15 can be provided with single coil 55a, 55b, 55c of support stack Multiple supporting projections 19 with 55d.

Supporting projections 19 can be set to allow the plate coil 55 of stacking to be separated from each other.Therefore, support is prominent Play 19 and can pass through the position of the plate coil 55 that supporting projections 19 supports generally according to stacking according to not Same length highlights.

Such as, the supporting projections 19 supporting the plate coil 55 being arranged on highest portion office can be according to the longest Length highlight.

It addition, use fixed projection 18 (see Fig. 4) at the plate coil according to above-mentioned exemplary embodiment In the case of support, fixed projection can be used as supporting projections 19.

The coil block being as noted previously, as the exemplary embodiment according to the disclosure includes flat board line Circle, therefore coil block can be applied in high-power and high electric current, and can have the thermal radiation property of improvement And insulation characterisitic.

Even if it addition, coil block includes plate coil, it also can connect by having the outside of pin-shaped formula Connecting terminal is arranged on mainboard.Therefore, the leading part of plate coil need not be bonded directly to mainboard, Thus coil block can be easily installed.

Further, since plate coil and external connection terminals are combined the most jointly by conductive adhesive, Therefore coil block can be easily manufactured.

Additionally, due to can be by the engagement groove being formed in plate coil and leading of being formed on bobbin To the motion in the fabrication process of the leading part of portion's suppression plate coil, therefore it is significantly reduced owing to drawing The generation of the defect that the motion in line portion, shake etc. cause.

Although have been shown above and describe exemplary embodiment, but for those skilled in the art It will be apparent that in the case of without departing from the scope of the present invention being defined by the claims, can make Amendment and modification.

Claims

1. a coil block, described coil block includes:

At least one plate coil；

Bobbin, including being wound around space and portion of terminal, described plate coil is arranged in described winding space, External connection terminals is fastened to described portion of terminal, and the leading part of described plate coil is attached to described outside and connects Connecting terminal；

Core, is attached to described bobbin.

Coil block the most according to claim 1, wherein, the leading part of described plate coil has Being formed at the engagement groove of the end of leading part, described external connection terminals is in being inserted into described engagement groove It is simultaneously joined to described plate coil.

Coil block the most according to claim 1, wherein, described plate coil and described outside connect Connecting terminal is bonded to each other by conductive adhesive.

Coil block the most according to claim 1, wherein, described portion of terminal includes being formed at described Multiple guide parts in portion of terminal, to suppress the motion of the leading part of described plate coil.

Coil block the most according to claim 4, wherein, each respectively shape in described guide part Become between external connection terminals.

Coil block the most according to claim 4, wherein, each in described guide part include from The separate part that described portion of terminal is prominent and the extension that the end from described separate part extends, wherein, described Extension extends according to the form of the area of described separate part.

Coil block the most according to claim 6, wherein, two guide parts in described guide part Interval between separate part is wider than the width of the leading part of plate coil, two guide parts in described guide part Extension between interval than the narrow width of leading part of plate coil.

Coil block the most according to claim 1, wherein, bobbin includes:

Pedestal, described portion of terminal is formed at the two ends of described pedestal；

Partition wall, is set to separate with described pedestal,

Described plate coil is arranged on the outside of described partition wall.

Coil block the most according to claim 8, wherein, described bobbin includes from described separation The outer surface of wall highlights and suppresses at least one fixed projection of motion of described plate coil.

Coil block the most according to claim 8, wherein, described plate coil is set to each other Stack and be attached to multiple plate coils of bobbin,

Described bobbin includes highlighting and allow the plate coil of stacking from the outer surface of described partition wall each other Separate at least one separate projection.

11. coil blocks according to claim 8, wherein, described pedestal and described partition wall bag Include at least one coil of wire being arranged between described pedestal and described partition wall.

12. coil blocks according to claim 8, wherein, described partition wall includes:

Second partition wall, described plate coil is arranged on the outside of described second partition wall；

First partition wall, is arranged between the second partition wall and described pedestal.

13. coil blocks according to claim 12, described coil block also includes being separately positioned on Cloth between described pedestal and described first partition wall and between described first partition wall and the second partition wall Line coil.

14. coil blocks according to claim 13, wherein, are wrapped in the first partition wall and second Coil of wire and plate coil between partition wall are secondary coils.

15. coil blocks according to claim 11, wherein, described portion of terminal includes arranging wiring The first terminal portion of the lead-in wire of coil and second portion of terminal of leading part of plate coil is set, the first end Sub-portion and the second portion of terminal are separately positioned on the two ends of pedestal.

16. 1 kinds of coil blocks, described coil block includes:

At least one plate coil；

Bobbin, including multiple external connection terminals, plate coil is attached to the plurality of external connection terminal Son,

Wherein, plate coil is electrically connected to outside by external connection terminals.

17. coil blocks according to claim 16, wherein, plate coil and external connection terminals It is bonded to each other by conductive solder.

18. 1 kinds of methods manufacturing coil block, described method includes:

Coil of wire is wrapped on bobbin；

Plate coil is attached to bobbin；

The external connection terminals of plate coil and bobbin is bonded to each other；

Iron core is attached to bobbin.

The method of 19. manufacture coil blocks according to claim 18, wherein, is combining plate coil In the step of bobbin, plate coil is attached to bobbin so that the end of leading part of plate coil Contact external connection terminals.

The method of 20. manufacture coil blocks according to claim 19, wherein, the step bag of described combination Include: at the solder being partially submerged to store fusing that plate coil and external connection terminals are contacted with each other Lead bath groove in while apply fusing solder, then make the solder solidification of fusing.