CN1014763B - Making method of printed-wiring board - Google Patents
Making method of printed-wiring board Download PDFInfo
- Publication number
- CN1014763B CN1014763B CN 90103274 CN90103274A CN1014763B CN 1014763 B CN1014763 B CN 1014763B CN 90103274 CN90103274 CN 90103274 CN 90103274 A CN90103274 A CN 90103274A CN 1014763 B CN1014763 B CN 1014763B
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- metal
- hole
- pad
- copper
- hole wall
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- Printing Elements For Providing Electric Connections Between Printed Circuits (AREA)
Abstract
The present invention discloses a method for manufacturing a bonding pad from a double-face copper cladding plate by etching method. In the method, the surface of a plated through-hole wall is made of a terne alloy or other metals which are easily welded, and a circuit board of terne alloy is not arranged between a solder resist layer and a current conduction copper rod under the solder resist layer. The present invention is characterized in that the present invention comprises the steps that a nonconducting film is used for masking a metal part except the bonding pad and a through hole, and the terne alloy and other metals which are easily welded are only electroplated on the surfaces of the inner walls of the bonding pad and the through hole. After wave soldering is carried out to the circuit board produced by the method, the solder resist layer is unruffled and does not bubble and break away, the appearance is identical with the appearance of a single-sided board to which wave soldering is carried out.
Description
The present invention relates to a kind of manufacture method of printed substrate and the printed substrate of producing with this method.More particularly, the present invention relates to a kind of at the easy weldering metal and make the method for printed substrate of pad and plated-through hole inner wall surface electroplating lead tin alloy or other, and the wiring board of producing by this method.
The double-sided wiring board of plated-through hole is at computer, and telecommunications and electronic instrument field consumption are very big.Complete system plant wishes that the pad of wiring board and through-hole wall solderability are good, and it is long to weld the life-span, stores through the long period exactly still to have good solderability, wishes that the other parts of wiring board except that pad are not affected by filtering the peak postwelding.Therefore, the wiring board of producing is all used silk screen process solder resist coating at last at present, only exposes the pad portion that needs soldering part, is subjected to the influence of wave-soldering with other parts that prevent wiring board.Exposed bond pad surface generally is a terne metal, and solderability is good and can to weld the life-span long.
But, because the popular line thickness of can producing is so-called graphic plating method in the method for 0.15～0.25 millimeter two-sided hole plate at present.Be exactly earlier with behind double face copper punching and the plated-through hole, figure transfer to copper-clad plate, is covered the part that copper-clad plate will etch away, expose the part that will keep as line conductor, carry out graphic plating then, only at the part that will keep and electro-coppering of plated-through hole inwall and terne metal.Following step is to remove the cloak of figure transfer.Carry out etching again, this moment, terne metal was covered the part that will keep, and the result only erodes the above-mentioned part that will etch away.Because there is one deck terne metal on the conductive copper bar surface that remains, so even through behind the hot air leveling, the solder resist coating of biting again still has one deck terne metal between copper bar that solder resist covers and the solder mask layer.Like this, this layer terne metal fusing when wave-soldering, the solder mask layer on it is in the state that floats over liquid surface, is subjected to the effect of self stress to be easy to, to have bubbled, even disengaging, influences the complete machine quality.
The another kind of method of producing the double-sided metal orifice plate is so-called electric plating of whole board figure encapsulation method.Double face copper is carried out electric plating of whole board copper through punching behind the hole metallization, shift and go up figure, covers the part and the plated-through hole that will keep as line conductor, exposes the part that will etch away.Through after the etching, the solder mask layer of biting again exposes pad, only is coated with terne coating in bond pad surface with hot air flattening technology.The phenomenon that solder resist rises, bubbles can not take place in such wiring board behind wave-soldering.But these class methods have to carry out electric plating of whole board when electroplating thickened metalized hole.As a result, the energy and material have been wasted; And being electric plating of whole board, important consequence increased the thickness of Copper Foil.In general, for guaranteeing through hole resistance, the plated-through hole inwall should be electroplated the copper of 25 micron thickness; That is to say that when the plated metal hole, the Copper Foil of copper-clad plate has also been thickeied 25 microns at least, etching work procedure has to increase lateral erosion with longer etching time like this, is not suitable for producing the hachure wiring board.Universal experience is thought, when line thickness is 0.30 millimeter, adopts the graphic plating method should select 35 microns tube paper tinsels for use; And should select 18 micron copper foils for use through the masking method of electric plating of whole board, when line thickness was 0.13～0.20 millimeter, the graphic plating method was selected 18 micron copper foils for use, and masking method must be selected 9 microns or thinner Copper Foil.Because the masking method through electric plating of whole board is not suitable for producing the fine rule batten, above-mentioned shortcoming is arranged, so replaced by the graphic plating method gradually again.
Therefore, wish that in the printed wiring board field a kind of method can be arranged, in the method, there is not the electric plating of whole board operation, can reduce lateral erosion like this, save material and the energy and can produce the hachure wiring board as the graphic plating method, but do not have layer of lead-tin alloy again between the solder mask layer of product and the conductive line, and only easily weldering metal of terne metal or other is arranged at exposed pad and plated-through hole inner wall surface.The inventor is surprised to find that, producing with etch process in the process of plated-through hole double sided board, increases an exposed pads and shelters other parts, and only the operation of electroplating in pad and plated-through hole inner wall surface just can address the above problem.Therefore, the object of the present invention is to provide a kind of manufacture method of printed substrate, comprise the following steps: punching, at through-hole wall chemical deposition metal, electroplate thickened metalized hole, with figure transfer to copper-clad plate, remove unwanted Copper Foil with etching solution, the silk screen process solder resist, it is characterized in that this method also comprises the metal that the is used in through-hole wall deposition conductor as the conducting cathode power, cover metal part except that pad and through hole with nonconducting film, only in the easy step of weldering metal of pad and through-hole wall electroplating surface deposit lead ashbury metal or other.
No matter popular graphic plating method still in the so-called masking method, can increase provided by the invention the step at pad and through-hole wall electroplating deposition terne metal or other easy weldering metal at present.But for the graphic plating method, just can not the graphic plating terne metal as the shelter of etching work procedure, be higher than the shelter of the metal or alloy of the temperature that wave-soldering bathes and need to electroplate fusing point as etching work procedure.As long as method of the present invention is implemented in the technology of the two-sided hole of any manufacturing plate, can both address the above problem, and save the material and the energy, can not increase cost.The quality of product is improved, and the complete machine quality that assembling is come out also is improved.
When implementing method provided by the invention, can before etching work procedure, finish step at pad and through-hole wall electroplating surface deposit lead ashbury metal or other easy weldering metal.The concrete practice is earlier double face copper to be punched, and the metallized hole of all need all will be accomplished fluently.Chemical deposition metal on through-hole wall and full plate then, again land pattern is transferred in the copper-clad plate, shelter part except that pad and through hole with non-conductive film, Copper Foil on every of metal that deposit in the through hole this moment and double face copper is UNICOM all, be placed in the electroplating bath, cathode power can be connected on arbitrary the Copper Foil, can be at pad and any metal of through-hole wall electroplating deposition.The metal that should be noted that the last electroplating deposition in pad and through-hole wall surface is exactly the metal on finished product wiring board pad and through-hole wall surface, and therefore, deposition should be terne metal or other easy weldering metal at last; But preferably be not copper, but the metal of etching resistant liquid.This be because, after this electroplating deposition step, to remove masking film, and then shift and go up line pattern, shelter the Copper Foil and the through hole that will keep with the film of anti-etching liquid, it is generally acknowledged that only sheltering through hole with film is the comparison difficulty, in case the through hole upper film is damaged in operation, in etching process, will corrode the metal on the through-hole wall, therefore pad and through-hole wall surface preferably are not copper, but the metal of etching resistant liquid as terne metal, has so just been exempted necessary plug-hole or must have been used the thicker requirement of covering the hole dry film.
In above-mentioned implementation process, reasonable operation is earlier land pattern to be transferred in the copper-clad plate, then only at pad and through-hole wall surface chemistry plated metal copper or nickel, only electroplates thickening copper at through hole and pad again, and electroplating lead tin alloy or other be the weldering metal easily.Then, remove the plating masking film; Shift and go up the circuit masking film, carry out etching, the soldering-resistance layer of biting after the etching is finished product.
Now, silk screen process technology 0.2～0.3 millimeter the lines of can clearly biting, and the land pattern general precision is all not too high, therefore, covers the complete available silk screen process film of non-conductive film that removes pad and throughhole portions; But should select the printing ink of easily removing type for use.Like this than dry film or to be coated with the method cost of photoresists low.
Above-mentioned embodiment is similar to traditional electric plating of whole board masking method, but saved the electric plating of whole board operation, only electroplate the step of thickening and last electroplating surface slicker solder and replace, and need not use hot air flattening technology coating slicker solder, reduced cost at pad and through-hole wall.
In addition, method provided by the invention also can be implemented behind etching work procedure, promptly etches away unwanted Copper Foil, only keeps on the half-finished circuit board of conductive copper bar to implement.The copper bar of each face is not communicated with mutually on the wiring board in double-sided metal hole, but by plated-through hole, the arbitrary copper bar on each face necessarily is communicated with a copper bar of another side.One conducting surface and wiring board arbitrary is superimposed, the every copper bar conducting on this conducting surface and superimposed, and by plated-through hole also with every copper bar conducting of another side.Solder resist or other non-conductive film only expose pad and through hole if bitten on the another side; After putting into electroplating bath, conducting surface connects cathode power, just can be only at exposed pad and through-hole wall electroplating surface deposit lead ashbury metal or other easy weldering metal.
So, still, can select as required fully by the present invention's plated-through hole behind etching work procedure to the operation of before etching, finishing plated-through hole by existing masking method or graphic plating.If require the conductive copper bar of wiring board thicker as being thicker than 50 microns, line thickness is narrower as be narrower than 0.25 millimeter, that preferably adopts the processing step of similar pattern galvanoplastic, i.e. plated-through hole before etching, with the copper bar that the thickening of graphic plating method will keep,, need not thicken the copper bar that will keep if the copper thickness of commercially available copper-clad plate just can meet the demands, so fully can be after etching plated-through hole again, electroplate the metal of thickening chemical deposition by method of the present invention again at through-hole wall.Processing step directly shifts figure with regard to simple especially, double face copper like this, shelters the part that will keep Copper Foil, is etched into the double sided board that does not have plated-through hole with etching solution.As for punch out step, can before being etched with, carry out, also can after being etched with, carry out.Then, silk screen process solder resist film, an exposed pads and through hole so just can be electroplated thickening pad and through-hole wall with superimposed of conducting surface more only at pad and through-hole wall chemical deposition metal, and last electroplating lead tin alloy or other be the weldering metal easily.
Adopt similar pattern electroplating technique step, also can implement method of the present invention.A kind of embodiment is the Copper Foil that the graphic plating thickening will keep.Identical with the graphic plating method before pattern plating copper, but graphic plating terne metal more just after this, and need make the metal or alloy that graphic plating etching resistant liquid and fusing point are higher than the wave-soldering bath temperature into, as nickel, tin-nickel alloy etc.Etching then, the seal solder resist easily welds metal at welding plate hole inwall electroplating lead tin alloy or other at last.Another kind of scheme is not thicken the Copper Foil that will keep.Before figure transfer is to the copper-clad plate, do not needing plated-through hole; And after figure transfer, expose the Copper Foil and the through hole that will keep, once at Copper Foil and through-hole wall surface chemistry nickel deposited or other etching resistant liquid metal, just carry out etching then, the solder resist of biting again after the etching, at pad and through-hole wall electroplating deposition copper with thickened metalized hole, at last at the easy weldering metal of electroplating surface deposit lead ashbury metal or other.
In a word, in the process of existing various manufacturing double-sided metals hole wiring board, can implement provided by the invention step at pad and through-hole wall electroplating surface terne metal and other easy weldering metal.Self-evident, to conceive substantially according to the present invention, any variation in implementation process is also all within the scope of the present invention.Also should be mentioned that arbitrary superimposed method of the wiring board after conducting surface and the etching, superimposed purpose is to make the every copper bar on the one side all logical with the conducting surface Electricity Federation.For this reason, preferably use special frock clamp, generally all more than 1 millimeter, rigidity is better for the double-sided copper-clad plate thickness, available pinching anchor clamps.This clamp structure is a rectangular frame, similar family picture frame, and material can be selected stainless steel or other material of anti-the electroplate liquid for use.The wiring board that vacant edge arranged all around is as the cell mount of packing into of the glass in the picture frame, blocked by frame edge all around, expose the one side that wiring board will be electroplated, superimposed conducting surface on the another side, count wire netting as high order, conducting surface is elastomeric material behind, as soft rubber pad, and air bag etc., use rigid plane at last, after fastening between rigid plane and the framework, by elastomeric material, conducting surface just with superimposed with it wiring board face on every copper bar contact conducting.After conducting surface and cathode power are connected, every copper bar by plated-through hole all with the copper bar conducting of the one side that will electroplate.Like this, cover the part except that pad and through hole, just can put into electroplating bath at pad with led to any metal of hole inner wall surface electroplating deposition.
Following embodiment is intended to illustrate, without any can only be by the meaning of this enforcement.
Example 1
Double face copper is after punching, and SnCl is used in deburring and oil removing after the alligatoring
2The solution sensitization.Silk screen process land pattern then, an exposed pads and through hole place the activating solution that contains silver nitrate to activate again, place conventional chemical copper plating solution then, the result only pad and through-hole wall chemical deposition copper.
The Copper Foil of this plate is communicated with the negative electrode of electro-coppering groove, and in through hole and pad electro-coppering, the control time makes the thickness of electro-coppering be about 25 microns; Place the electroplating lead tin alloy groove again, the terne metal of about 10 micron thickness of electroplating deposition.Then, remove the land pattern of silk screen process with conventional method, the silk screen process line pattern is sheltered the Copper Foil that will keep again, and this moment, printing ink was not printed in the through hole, but this is not serious, because of there has been the terne metal protective layer on the through-hole wall surface.Then, place the etching solution etching, use the silk screen process solder mask film after the etching, obtain only terne metal being arranged, and do not have the double-sided metal hole wiring board of terne metal between solder mask layer and the copper bar at pad and through-hole wall surface.
Example 2
The processing step of beginning is fully identical with the graphic plating method.Behind the pattern plating copper, graphic plating terne metal no longer, and make graphic plating nickel into.Hot air leveling not after the etching, the solder resist of directly biting exposes pad and through hole.Then, be clipped in the frock clamp of aforementioned forms, only at the terne metal of about 10 microns of pad and through-hole wall electroplating surfaces, obtaining between solder mask layer and the copper bar is the wiring board of metallic nickel.Behind wave-soldering, solder resist has not had and has become to bubbling phenomenon.
Example 3
Double face copper directly shifts line pattern after punching and oil removal treatment, shelter the Copper Foil that will keep with dry film, carries out etching, obtains the two sides and all is the conductive copper bar that will keep and do not have the semi-finished product of plated-through hole.
After this semi-finished product are handled with the sensitizing solution of electroless copper,, only expose pad and through hole with the silk screen solder resist of on these semi-finished product, biting.Then, semi-finished product are placed the treatment fluid of electroless copper, at pad and through-hole wall chemical depositing copper layer.The semi-finished product of plated-through hole place frock clamp again, and conducting surface is 200 order copper mesh, and copper mesh is through temper, and elastomeric material is a thin-walled latex airbag, and rigid plane is 1 millimeters thick corrosion resistant plate, framework and corrosion resistant plate bolted.One inflates towards airbag, and whether the pad position that one side inspection will be electroplated is connected with cathode power, after the pressure of airbag is enough to make each position that will electroplate and cathode power UNICOM, stops to inflate.To have half-finished anchor clamps and place electroplating bath, first electro-coppering is with thickened metalized hole, electroplating lead tin alloy then.Obtain pad and through-hole wall surface and be terne metal, and do not have the double-sided metal hole wiring board of terne metal between solder mask layer and the conductive copper bar.
Claims (9)
1, a kind of manufacture method of printed substrate comprises the following steps; The punching, at through-hole wall chemical deposition metal, electroplate thickened metalized hole, with figure transfer to copper-clad plate, remove unwanted Copper Foil with etching solution, the silk screen process solder mask layer, it is characterized in that, this method also comprises the metal that the is used in through-hole wall deposition electric conductor as the conducting cathode power, shelter metal part except that pad and through hole with nonconducting film, only in the easy step of weldering metal of pad and through-hole wall electroplating surface deposit lead ashbury metal or other.
2, method according to claim 1, it is characterized in that, said the step at pad and through-hole wall electroplating surface deposit lead ashbury metal or other easy weldering metal is to carry out before etching work procedure, just, after the double face copper punching, transfer in the copper-clad plate at the through-hole wall plated metal and with land pattern, shelter part except that pad and through hole with non-conductive film.With the copper-clad plate is the negative electrode electric conductor, at pad and through-hole wall electroplating surface deposit lead ashbury metal and/or other solderable metal.
3, method according to claim 2, it is characterized in that, wherein said step at through-hole wall chemical deposition metal is carried out after transferring to land pattern in the copper-clad plate, just, and only at pad and through-hole wall surface chemistry deposition and electroplating deposition metal.
4, method according to claim 2 is characterized in that, the said non-conductive film of sheltering part except that pad and through hole is the silk screen process film.
5, method according to claim 1, it is characterized in that, said pad and through-hole wall electroplating surface deposit lead ashbury metal or other easily the step of weldering metal be after etching work procedure, the solder mask film of silk screen process carries out after as the metal non-conductive film of sheltering except that pad and through hole partly.
6, method according to claim 5 is characterized in that, easily comprises electroplating deposition copper among the step of weldering metal at said at pad and through-hole wall electroplating surface deposit lead ashbury metal or other, with the step of the pore wall thickness in thickened metalized hole.
7, method according to claim 6 is characterized in that, the chemical deposition plated-through hole, and the step in the thickened metalized hole of electroplating deposition all is to carry out after having finished etching work procedure.
8, method according to claim 6, it is characterized in that, before etching work procedure, shelter the Copper Foil that will erode with sheltering film, expose the Copper Foil and the through hole that will keep, only behind the metal of exposed Copper Foil and through-hole wall chemical deposited nickel or other etch resistant solution, do not carry out just directly etching of graphic plating.
9, utilize the wiring board of the described method manufacturing of claim 1, it is characterized in that, only terne metal or other easy weldering metal of electroplating deposition arranged and between solder mask layer and conductive copper bar, do not have terne metal at pad and plated-through hole wall surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103274 CN1014763B (en) | 1990-07-07 | 1990-07-07 | Making method of printed-wiring board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90103274 CN1014763B (en) | 1990-07-07 | 1990-07-07 | Making method of printed-wiring board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1047603A CN1047603A (en) | 1990-12-05 |
| CN1014763B true CN1014763B (en) | 1991-11-13 |
Family
ID=4878001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90103274 Expired CN1014763B (en) | 1990-07-07 | 1990-07-07 | Making method of printed-wiring board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1014763B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008092309A1 (en) * | 2007-01-23 | 2008-08-07 | Dongming Li | Process for electroplating a printed circuit board with through-holes uncoverd by mask |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001053448A (en) * | 1999-08-12 | 2001-02-23 | Ibiden Co Ltd | Printed wiring board, solder resist resin composition, and method for manufacturing printed wiring board |
| CN100450328C (en) * | 2002-03-04 | 2009-01-07 | 普林塔有限公司 | Digital application of protective soldermask to printed circuit boards |
| CN101252815B (en) * | 2008-03-31 | 2010-06-09 | 广州金升阳科技有限公司 | Solder tray local tin plating method on circuit board |
| CN101267713B (en) * | 2008-04-30 | 2011-04-06 | 陈国富 | Making method of electric nickel and golden circuit board for saving nickel and gold dosage |
| CN101616549B (en) * | 2009-07-21 | 2011-01-05 | 东莞康源电子有限公司 | Method for manufacturing single-side thick copper stepped plate by electroplating addition method |
| CN102340930B (en) * | 2010-07-20 | 2013-08-21 | 王定锋 | Single-sided circuit board made by gluing flat wires arranged side by side with thermosetting adhesive film |
| CN102677102A (en) * | 2011-03-10 | 2012-09-19 | 北京航天动力研究所 | Reserved small hole electroforming method |
-
1990
- 1990-07-07 CN CN 90103274 patent/CN1014763B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008092309A1 (en) * | 2007-01-23 | 2008-08-07 | Dongming Li | Process for electroplating a printed circuit board with through-holes uncoverd by mask |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1047603A (en) | 1990-12-05 |
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