CN101807500B - Surface mounting fuse protector and manufacturing method thereof - Google Patents
Surface mounting fuse protector and manufacturing method thereof Download PDFInfo
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- CN101807500B CN101807500B CN2009100071576A CN200910007157A CN101807500B CN 101807500 B CN101807500 B CN 101807500B CN 2009100071576 A CN2009100071576 A CN 2009100071576A CN 200910007157 A CN200910007157 A CN 200910007157A CN 101807500 B CN101807500 B CN 101807500B
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- surface mounting
- termination electrode
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Abstract
The invention provides a surface mounting fuse protector and a manufacturing method thereof. The surface mounting fuse protector comprises an insulator and a fuse wire, wherein the insulator is provided with two cover plates which are arranged in contraposition and bonded, the two cover plates are both provided with grooves on the sides of the mutual contraposition, the grooves jointly form a cavity, two ends of the insulator are respectively provided with an end electrode, each end electrode is provided with an outer side end electrode, a middle-level end electrode and a cover electrode which form an electric connection, each cover electrode is formed on the side of the end face of the insulator, the outer side end electrodes are formed on both ends at the outer side of at least one cover plate and the middle-level end electrodes are formed at both ends at the side of at least one cover plate, which is formed with the grooves; and the fuse wire is clamped between the two cover plates, the central section of the fuse wire is suspended in the cavity, and two ends of the fuse wire are electrically connected with the middle-level end electrodes. The fuse protector can ensure that flashover does not escape from two ends when the fuse wire is fused and maintain the temperature at the two ends to be below a fusing point when the central section of the fuse wire is fused.
Description
Technical field
The present invention relates to a kind of surface mounting fuse protector and manufacturing approach thereof, relate in particular to small-sized surface mounting fuse protector of a kind of unsettled fuse-type and manufacturing approach thereof.
Background technology
Current, how printed circuit board (PCB) is is applied in the various electric and electronic equipments.The circuit that on these printed circuit board (PCB)s, forms generally all needs overcurrent protection.One of mode that this overcurrent protection is provided is to use the small-sized surface mounting fuse protector that is fixed on the printed circuit board (PCB).
Above-mentioned fuse wherein one type be unsettled fuse-type, it is suspended on fuse (lead) in the shell of hollow.The two ends of fuse are fixing in a different manner with the termination electrode.Because the thermal transmission coefficient of air is much littler than most solid, therefore the less energy of the fuse of unsettled fuse-type needs just can be with fuse failure, and its resistance can also be less.The fuse of this type has detailed explanation: US 5,617,069,5,648,750,5,214,406,5,926,084,6,147,585,6,903,649,4,920,327,4,467,308,3,460,086,6,798,330 in following United States Patent (USP).These patents of invention have described how fuse is fixed on the distinct methods in the cavity, and its purpose is to avoid contacting of fuse stage casing and chamber wall more, to the stress that fuse applied, increase reliability that fuse is connected with the termination etc. when reducing to install.The fuse of this type adopts earthenware and metal cap parts to assemble one by one at present, and production efficiency is lower.
U.S. Pat 5,214,406 have disclosed a kind of structure of typical unsettled fuse-type surface mounting fuse protector.This fuse comprises the shell of circle foreign side in, two termination metal caps, and two ends are welded on the fuse on the two ends metal cap.This fuse has the characteristics of unsettled fuse-type fuse, because the peritropous rate of heat transfer of unsettled fuse (lead) is lower, required fusing heat is less, so its resistance also can be done lessly.
But said as above-mentioned document US 5,214,406, the fuse of many unsettled fuses (lead) type fuse is tiny easily broken, and certain difficulty is arranged when mounted.For guarantee fuse except that two ends not with the influence of housing contacts to avoid conducting heat to operating chacteristics, have to again the bending two ends of fuse is fixed on the end face at two diagonal angles.When being pressed into two ends copper cap, the frictional force between copper cap and fuse can produce tension force to fuse.These bendings and tension force all possibly make tiny easily broken fuse produce distortion or fracture.There are the shell of constant slope, the tension force that when being pressed into to reduce the copper cap fuse is produced in the improvement design employing two ends of this prior art.But copper cap and housing contacts will have enough frictional force can not come off when installing and use to guarantee the copper cap.This just must make the inside dimension of copper cap be less than the external dimensions with the housing contacts place.The design of this fuse can reduce but can not eliminate the tension force that when being pressed into two ends copper cap, fuse is produced.And the minimizing of this tension force that fuse is produced is to be cost with the minimizing of copper cap and the frictional force of housing contacts and the reliability that is connected.Improvement design in the above-mentioned document is with scolding tin the fuse two ends to be welded on two terminations.But this improvement design also can not be eliminated because of the fuse bending two ends and cause the injury possible to fuse.And scolding tin when fusion can with fuse materials commonly used, like copper, form low-melting alloy.The formation of this low-melting alloy can reduce the consistency of fuse blows characteristic.In addition, this fuse need adopt the method for assembling one by one to be assembled, and production efficiency is lower.
Japanese Publication Laid-Open JP2006-244948 has disclosed the method with the unsettled fuse of the superimposed making of two-tier circuit plate (lead) type surface mounting fuse protector.The fuse that this method is made has fuse and extends to the characteristic beyond the shell, when the fuse failure starting the arc, might electric arc be caused beyond the shell.When the fuse stage casing fused, the temperature at fuse two ends may rise to more than the fusing point.And the two ends of fuse only form point through end face and coated electrode and contact, and can not guarantee bonding strength and enough reliabilities.In addition, the through hole of two-tier circuit plate all bores before superimposed, when cementation laminated, has glue unavoidably and gets on the fuse in through hole and the through hole, causes and electroplates the defective that connects.The another one shortcoming of the processing method that through hole has bored before the two-tier circuit plate is superimposed is that the size and the position of through hole inevitably has certain deviation; Make the surface of two superimposed through holes be difficult to form smooth cylindrical hole, thereby influence adhere to the machinery and the reliability that is electrically connected of the connection metal level on the cylindrical hole.
Summary of the invention
The present invention is the new development on above-mentioned prior art and No. 200810092353.3 application of Chinese patent basis, makes the fuse that produces more reliable.
The small-sized surface mounting fuse protector and the manufacturing approach thereof that the purpose of this invention is to provide a kind of unsettled fuse (lead) type; Effectively to avoid electric arc being caused the phenomenon beyond the shell when the fuse failure starting the arc; And make that the temperature at fuse two ends remained on below the fusing point when fuse stage casing fused.In addition, can make adding the smooth through hole of accurate formation in man-hour, guarantee electroplating quality through this manufacturing approach.
First aspect of the present invention provides a kind of surface mounting fuse protector; This surface mounting fuse protector comprises: insulator; The two cover plates that this insulator has opposite disposed and combines, said two cover plates is equipped with groove in a mutual opposed side, and said groove combines to form cavity jointly; The two ends of said insulator are respectively equipped with termination electrode; Each termination electrode has the coated electrode that forms outboard end electrode, the middle level termination electrode that is electrically connected and be formed on said insulator end face side, and said outboard end electrode is formed on the two ends, the outside of at least one said cover plate, and said middle level termination electrode is formed on the two ends of the reeded side of formation of at least one said cover plate; And fuse, this fuse clip is located between the two cover plates, and the stage casing of this fuse is suspended in the said cavity, and these fuse two ends form with said middle level termination electrode and are electrically connected.
Preferably, this fuse side faces at both ends is close to the middle level termination electrode, and the end face at these fuse two ends covers connection by coated electrode.
According to above-mentioned surface mounting fuse protector of the present invention, because being capped electrode, fuse covers, therefore guarantee that arcing can not leak from two ends when fuse failure.And increased the rate of heat dispation at fuse two ends with the middle level termination electrode that the fuse side faces at both ends is close to; Thereby the temperature that can keep its two ends when fusing in the fuse stage casing is below fusing point; And make the fuse and the joint face of coated electrode increase to middle level termination electrode and the whole periphery that contacts of coated electrode, improved the intensity and the reliability that connect.
Second aspect of the present invention relates to a kind of method of making above-mentioned surface mounting fuse protector, and this method comprises the steps:
(a) two substrates of preparation; One side of every said substrate is formed with groove array; A side that does not form groove array of one of them piece substrate forms the outboard end electrode pattern, and a side of the formation groove array of one of them piece substrate forms the middle level termination electrode pattern corresponding with said outboard end electrode pattern;
(b) side that is formed with groove array of two substrates is opposed bonding, and folder is established fuse between two substrates, makes fuse pass through each cavity and middle level termination electrode pattern that the groove array by two substrates forms postpone;
(c) process the through hole that passes two substrates and outboard end electrode pattern, middle level termination electrode pattern and fuse respectively in each cavity both sides, and form coated electrode in through-hole surfaces;
(d) process single surface mounting fuse protector according to the position cutting of said through hole.
When utilizing above-mentioned manufacturing approach to produce surface mounting fuse protector of the present invention, because intercommunicating pore is last, drill through after infrabasal plate is bonding, do not have the adhesive of extruding in the hole, the smooth cleaning of hole wall through electroplating, can form fine and close metal cylinder on hole wall.In order to reduce connection resistance, the material of metal cylinder is generally softer fine copper.On this metal cylinder, the lower surface links to each other with termination electrode, and the centre links to each other with fuse with the middle level termination electrode, and the design of electrode has higher intensity in the middle level than not having.
Description of drawings
Fig. 1 is the stereogram of surface mounting fuse protector of the present invention;
Fig. 2 is the sectional block diagram of surface mounting fuse protector of the present invention;
Fig. 3 is in making the process of surface mounting fuse protector of the present invention, the cutaway view with cover plate up and down after bonding;
Fig. 4 is in the process of making surface mounting fuse protector of the present invention, the cutaway view after boring is electroplated;
Fig. 5 is the key diagram for the cutting action in the process of making surface mounting fuse protector of the present invention;
Fig. 6 is the operating chacteristics curve chart of the fuse instance of three rated current.
Embodiment
Below, be elaborated with reference to the concrete structure of 1,2 pairs of surface mounting fuse protectors of the present invention of accompanying drawing.
Fig. 1 shows the stereogram of surface mounting fuse protector 1400 of the present invention.The insulation crust of fuse 1400 is made up of upper cover plate 100 and lower cover 200, and the two ends of upper and lower cover plate are respectively equipped with outboard end electrode 300,400,500 and 600.
Referring to Fig. 2, the downside of the upper cover plate 100 of surface mounting fuse protector of the present invention is provided with middle level termination electrode 310,510.Following and the fuse 1000 of middle level termination electrode combines.The stage casing of fuse is suspended in the cavity 900 that the groove 910,920 by upper and lower cover plate constituted.One end of outboard end electrode 300,400, middle level termination electrode 310 and the fuse 1000 of fuse one end is connected through coated electrode 700.The other end of outboard end electrode 500,600, middle level termination electrode 510 and the fuse 1000 of the fuse other end is connected through coated electrode 800.Middle level termination electrode 310,510 is reinforced the middle part of coated electrode 700 and 800, and the fuse and the joint face of coated electrode are increased to middle level termination electrode and the whole periphery that contacts of coated electrode, has improved the intensity and the reliability that connect.In addition, middle level termination electrode 310,510 has also increased the rate of heat dispation at fuse two ends, and when fusing in the fuse stage casing, the temperature that keeps two ends is below fusing point.
Two coated electrodes 700 of surface mounting fuse protector of the present invention and 800 with the sealed at both ends of fuse in fuse.Fuse uses copper (1085 ℃ of fusing points) to make usually, and the nickel dam (1455 ℃ of fusing points) of higher melt is arranged in two coated electrodes 700,800, and when making fuse failure, arcing can not leak from two ends.Fuse in use, two outboard end electrodes 400,600 of lower cover 200 are fixed on the circuit board through welding respectively, reach predetermined value like electric current, fuse 1000 disconnection that will fuse, thereby to circuit overcurrent protection is provided.
In the foregoing description; Upper and lower both sides at fuse 1400 all are formed with the outboard end electrode; But the outboard end electrode also can only be located at fuse with the printed circuit board (PCB) fixing side of fitting; For example only at the arranged outside termination electrode 400,600 of lower cover 200, and termination electrode is not set in the outside of upper cover plate 100.
In addition, upper and lower cover plate 100,200 can pass through adhesive 1100 adhesive bond, also can combine through form fit modes such as concavo-convex cooperation or other suitable mode.
Below, with reference to accompanying drawing 3-5 the manufacturing approach of surface mounting fuse protector of the present invention is elaborated.
Fig. 3 shows the profile of the intermediate member of the pilot process of making above-mentioned fuse 1400.
Prepare two insulation boards (macromolecular material plates such as thermoplasticity or thermoset plastics, but or the glass ceramic board of machining) that will form upper and lower cover plate 100,200, two substrates all are not provided with through hole.Two substrates all therein a side through as mill, mechanical means such as punching press processes groove array.Wherein a substrate forms the middle level termination electrode pattern corresponding with groove array in a side that forms groove array, and two substrates all form the outboard end electrode pattern in a side that does not form groove array.Can form outboard end electrode pattern and middle level termination electrode pattern through adhering to Copper Foil; Also can be with the surface with the circuit board of Copper Foil as substrate, and the method for chemical corrosion of electricity consumption burn into or machining is removed the part Copper Foil and is processed the outside and middle level termination electrode pattern.Certainly, the outside and middle level termination electrode pattern also can be formed by other electric conducting material.
Fig. 4 shows the profile of the intermediate member of manufacture process subsequently, has shown coated electrode 700,800.The manufacture method of coated electrode is:
(1) with adhesive solidification, and the layout according to groove array gets out through hole on the substrate after the adhering and solidifying; Through hole passes outboard end electrode pattern and middle level termination electrode pattern; In the lump the part of being close to middle level termination electrode pattern of fuse 1000 is cut off during boring; Through hole is smooth vertical, and exposes the becket of outboard end electrode pattern, middle level termination electrode pattern and the metal covering of fuse termination.
(2) with the surface active of through hole, and with electroplating or chemical plating forms the coated electrode 700,800 of metal; Coated electrode is closed in fuse 1000 in the fuse, and outboard end electrode pattern, middle level termination electrode pattern and fuse 1000 are formed machinery and electrical connection.
Can form coated electrode through chemical plating or electric plating method plated with copper and/or nickel in the through hole behind surface active.Other metal depositions can also adopt, and metal lining has the fusing point higher than scolding tin, thereby form the connection that better heat resistance is arranged than scolding tin.In addition, adopt metal deposition to connect and also avoided forming the possible of low-melting alloy, thereby make the operating chacteristics of fuse more consistent through being welded to connect the scolding tin and the fuse that cause.
In addition, also can be surperficial with plating soldering-tin layer, to guarantee the solderability of electrode at termination electrode and coated electrode.Under the situation that termination electrode and coated electrode are formed by copper, also can between soldering-tin layer and copper, plate the nickel that one deck shields.
Fig. 5 has described the sketch map that subsequently fuse part of full wafer is cut into single fuse, and wherein 1200 is transverse cut, and 1300 is vertical line of cut.
In above-mentioned manufacturing approach, on two substrates, all be formed with the outboard end electrode pattern, but also can only form the outboard end electrode pattern on a substrate therein, to reduce cost.In addition, also can all form the middle level termination electrode pattern corresponding,, thereby further improve reliability with engaging of further enhancing fuse and middle level termination electrode in a side that is formed with groove array of two substrates with groove array.
Instance data
Table 1: according to the data of three instances of surface mounting fuse protector of the present invention.
Wherein: I
2T is the product of fusing time current squaring and fusing time when being 0.001 second.
Three used upper cover plates of instance are the PC plate of 0.7mm, and all there is the Copper Foil of 0.035mm on the two sides; Lower cover is the PC plate of 1mm, and the Copper Foil of 0.035mm is arranged below.Fuse is of a size of: long 6.1mm, wide 2.5mm, thick 2mm.
Fig. 6 shows the operating chacteristics curve of 1.25,7 and 20 amperes of fuses with fuse structure of the present invention.
In order to check the reliability of fuse of the present invention, the spy has carried out 5 reflow weldings to it and has connect the crooked test with 2mm.The result of test lists in the table 2.Data in the table 2 show, the resistance value of fuse experienced 5 reflow weldings connect with the 2mm crooked test after, the basic no change of resistance value.Fuse and termination electrode, the inner middle layer termination electrode, and the connection of coated electrode is reliable.
Show 2:5 reflow welding and connect bend test results with 2mm
Claims (5)
1. a surface mounting fuse protector (1400), this surface mounting fuse protector comprises:
The two cover plates (100,200) that insulator, this insulator have opposite disposed and combine, said two cover plates (100,200) is equipped with groove (910,920) in a mutual opposed side, and the common combination of said groove (910,920) forms cavity (900); The two ends of said insulator are respectively equipped with termination electrode, and each termination electrode has outboard end electrode (300,500; 400; 600), the middle level termination electrode (310; 510) and be formed on the coated electrode (700,800) of said insulator end face side, said outboard end electrode is formed on the two ends, the outside of at least one said cover plate; Said middle level termination electrode is formed on the two ends of the reeded side of formation of at least one said cover plate, forms each other between said outboard end electrode, middle level termination electrode and the coated electrode to be electrically connected; And
Fuse (1000), this fuse clip are located between the two cover plates (100,200), and the stage casing of this fuse (1000) is suspended in the said cavity (900), and this fuse (1000) two ends and said middle level termination electrode (310,510) form and be electrically connected.
2. surface mounting fuse protector according to claim 1 (1400) is characterized in that, this fuse (1000) side faces at both ends is close to said middle level termination electrode (310,510), and the end face at this fuse (1000) two ends and said coated electrode (700,800) link to each other.
3. surface mounting fuse protector according to claim 1 (1400) is characterized in that, said two cover plates (100,200) is through binding agent (1100) adhesive bond.
4. surface mounting fuse protector according to claim 1 (1400); It is characterized in that; Said two cover plates (100,200) but process by the composite material of the macromolecular material with insulating properties, macromolecule and insulation inorganic matter or the glass ceramic material of machining; Said outer termination electrode (300,500; 400,600), middle level termination electrode (310,510), coated electrode (700,800) and fuse (1000) are processed by the metal or alloy material with conductivity.
5. a method of making surface mounting fuse protector as claimed in claim 1 (1400) is characterized in that, comprises the steps:
(a) two substrates of preparation; One side of every said substrate is formed with groove array; A side that does not form groove array of one of them piece substrate forms the outboard end electrode pattern, and a side of the formation groove array of one of them piece substrate forms the middle level termination electrode pattern corresponding with said outboard end electrode pattern;
(b) side that is formed with groove array of two substrates is opposed bonding, and folder is established fuse between two substrates, makes fuse pass through each cavity and middle level termination electrode pattern that the groove array by two substrates forms postpone;
(c) process the via-hole array that passes two substrates and outboard end electrode pattern, middle level termination electrode pattern and fuse respectively in each cavity both sides; And at each through-hole surfaces formation coated electrode, this coated electrode forms with outboard end electrode pattern, middle level termination electrode pattern and fuse and is electrically connected;
(d) based on said via-hole array said substrate is cut and process single surface mounting fuse protector.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100071576A CN101807500B (en) | 2009-02-13 | 2009-02-13 | Surface mounting fuse protector and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100071576A CN101807500B (en) | 2009-02-13 | 2009-02-13 | Surface mounting fuse protector and manufacturing method thereof |
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| CN101807500A CN101807500A (en) | 2010-08-18 |
| CN101807500B true CN101807500B (en) | 2012-01-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5740768B2 (en) * | 2011-04-28 | 2015-07-01 | コーア株式会社 | Manufacturing method of cylindrical current fuse |
| CN102184816B (en) * | 2011-05-13 | 2013-11-06 | Aem科技(苏州)股份有限公司 | Suspended-fuse-wire-type surface-mount fuse and manufacturing method thereof |
| CN102568968B (en) * | 2011-12-20 | 2015-02-25 | Aem科技(苏州)股份有限公司 | Manufacturing method for suspended fuse type surface mount fuse instrument |
| CN103903929B (en) * | 2014-04-01 | 2016-08-31 | 南京萨特科技发展有限公司 | A kind of chip-shaped protection element and batch fabrication method thereof |
| CN107887232B (en) * | 2017-10-30 | 2019-10-08 | Aem科技(苏州)股份有限公司 | A kind of manufacturing method and fuse of the hollow structure fuse of high-seal |
| CN107610988B (en) * | 2017-10-30 | 2021-01-01 | Aem科技(苏州)股份有限公司 | Miniature super surface-mounted fuse and manufacturing method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1996536A (en) * | 2006-12-22 | 2007-07-11 | 邓昱 | A surface paste fuse of nano carborundum-alumina porcelain base and its making method |
| JP4200450B2 (en) * | 2005-03-07 | 2008-12-24 | 松尾電機株式会社 | Manufacturing method of chip-type fuse |
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2009
- 2009-02-13 CN CN2009100071576A patent/CN101807500B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4200450B2 (en) * | 2005-03-07 | 2008-12-24 | 松尾電機株式会社 | Manufacturing method of chip-type fuse |
| CN1996536A (en) * | 2006-12-22 | 2007-07-11 | 邓昱 | A surface paste fuse of nano carborundum-alumina porcelain base and its making method |
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