CN1909764A

CN1909764A - Multi-layer printed circuit board

Info

Publication number: CN1909764A
Application number: CNA2006101001717A
Authority: CN
Inventors: 川崎洋吾; 佐竹博明; 岩田丰; 田边哲哉
Original assignee: Ibiden Co Ltd
Current assignee: Ibiden Co Ltd
Priority date: 1999-10-26
Filing date: 2000-10-10
Publication date: 2007-02-07
Anticipated expiration: 2020-10-10
Also published as: CN1909764B; JP4832621B2; JP2001127434A; CN1909763A; CN1909762A; CN1909763B; CN1909762B

Abstract

Provided is a multi-layer printed wiring board of the folding layer formed on both sides of the core substrate. Each of the folding layer is alternately equipped with an interlayer resin insulation and a conducting layer. The conducting layer connects each other through the switch ports, wherein the anti-soldering layer are formed on the multi-layer printed wiring board and the opening connecting the external connecting terminal is formed on the anti-soldering layer.

Description

Multi-layer printed circuit board

The application is that application number to be CN200510052624.9 (applying date is on October 10th, 2000), denomination of invention be the dividing an application of China's application of " manufacture method of multi-layer printed circuit board and multi-layer printed circuit board ", the application of described China is application number the dividing an application for the PCT application in the country's stage that enters of " manufacture method of multi-layer printed circuit board and multi-layer printed circuit board " that be CN00802391.3 (international filing date is on October 10th, 2000), denomination of invention.

Technical field

The present invention relates to the mutual lamination of interlayer resin insulating layers and conductor layer, the overlapping layers that connects by the switching hole between each conductor layer is at the multi-layer printed circuit board that the two sides of core substrate forms, and particularly relates to can be used as the multi-layer printed circuit board that the base plate for packaging that is loaded with the IC chip uses and the manufacture method of multi-layer printed circuit board.

Background technology

In the past, superimposed multi-layer printed circuit board, for example, useful spy opens that flat 9-130050 disclosed method makes.

Surface at the conductor circuit of printing distributing board forms roughened layer by electroless plating or etching.Then, by roller coating machine and printing to interlaminar insulating resin apply, exposure, developing, form the switching hole peristome of interlayer conduction, solidify, formally solidify to form interlayer resin insulating layers through UV.And then at the catalyst that passes through to pay on the alligatoring face that acid or oxidant impose roughening treatment palladium etc. of this interlayer resin insulating layers.Form thin electroless plating film then, on this electroplating film, form figure, after the metallide thickening, peel off with alkali and to remove dry film, make conductor circuit after the erosion with dry film.By this operation repeatedly, obtain superimposed multi-layer printed circuit board.

Now, along with the high-frequencyization of IC chip, also require high-speedization of transfer rate for multi-layer printed circuit board.In order to adapt to such requirement, the applicant has proposed the flat 10-334499 of special hope number.In this constitutes, as shown in figure 22, directly over through hole 336, set the switching hole 346 of lower interlayer resin insulating layers 350 and the switching hole 366 of upper strata interlayer resin insulating layers 360, with the distribution linearization(-sation), shorten distribution length, improve the transfer rate of signal.

, in the above-described configuration, found the switching hole 346 of lower interlayer resin insulating layers 350 and the switching hole 366 of upper strata interlayer resin insulating layers 360, under thermal cycle conditions, caused and peel off.The present inventor studies the switching hole 366 that this reason is the upper strata, is subjected to the influence of surface configuration in the switching hole 346 of lower floor, the cause that connectivity reduces.And then, infer because interlayer resin insulating layers 350,360 strengthens without the core of glass cloth etc., in thermal cycle, peel off easily than core substrate with core.

The present invention carries out in order to solve above-mentioned problem, as its purpose, is to provide when can shorten inner distribution length the multi-layer printed circuit board that connection reliability is good and the manufacture method of multi-layer printed circuit board.

The object of the present invention is to provide the manufacture method that to make multi-layer printed circuit board inexpensively.

On the other hand, in superimposed multi-layer printed circuit board, in order to improve reliability, potting resin in through hole.When potting resin, impose melanism-reduction and handle etc. in order to improve closely connected property for the surface of through hole, roughened layer is set.In addition, the miniaturization of the through hole that causes along with the densification of multi-layer printed circuit board, the resin filling materials that is filled in the through hole can use low viscous.

As in through hole, forming roughened layer, the example in the past of potting resin packing material, the spy open disclose for flat 9-181415 number in through hole, form copper oxide after, form interlayer insulating film behind the potting resin packing material.In addition, the spy open disclose for flat 9-260849 number in through hole by corrode form roughened layer after, form interlayer insulating film behind the potting resin packing material.

,, pit occurs on the resin filling materials in through hole, produce broken string etc. when forming distribution on the upper strata if use low viscous resin fill material.The present inventor shows when studying this reason, be because in the inserts and resin that constitute resin filling materials, the cause that flows out of the roughened layer (small anchor point) that forms along contact-making surface of resinous principle at through hole.Its result produces pit on the packing material in through hole, can not make core substrate smoothly.For this reason, when forming interlayer resin insulating layers and distribution manufacturing multi-layer printed circuit board on core substrate, be easy to generate broken string, disqualification rate raises.

The present invention carries out in order to solve above-mentioned problem, and its purpose is to provide the manufacture method of the multi-layer printed circuit board of the reliability that has improved distribution.

On the other hand, core substrate is to use at the interlayer that constitutes the core resin substrate and pastes the resin film of paying resin insulating barrier.Potting resin filler in the through hole that makes its perforation that forms.And then, form interlayer resin insulating layers, make the switching hole., for above-mentioned resin filler, produce following shortcomings.

At first, the 1st, if when the printing distributing board that will fill packing material carries out reliability test such as thermal cycle, near the seam portion of resin substrate and resin film, often crack at conductor part.The 2nd, after filling packing material, in the grinding step that carries out for planarization, on as the resin film of interlayer resin insulating layers, produce be full of cracks, crackle.The 3rd, cover coating if directly over through hole, form, often the electroplating film reaction stops, though directly over form the hole of transferring and can not be communicated with electric.

Since above 3 shortcomings, and become reliability and the low printing distributing board of electrical communication.

The present application is to provide the printing distributing board and the manufacture method thereof that can solve these shortcomings.

Disclosure of an invention

In order to achieve the above object, 1 multi-layer printed circuit board of invention, this multi-layer printed circuit board is, the mutual lamination of interlayer resin insulating layers and conductor layer, connect in the multi-layer printed circuit board of the overlapping layers between each conductor layer with the switching hole in the formation of the two sides of core substrate, its technical characterictic is

Form through hole and reach the interlayer resin insulating layers that forms on the two sides of this core substrate so that run through above-mentioned core substrate,

Directly over above-mentioned through hole, form the switching hole that connects external connection terminals.

2 of invention, its technical characterictic be, invention 1 in, fill filler in the inside of above-mentioned through hole, form and cover the conductor layer that expose face of this filler from through hole,

Switching hole directly over the above-mentioned through hole of formation on the above-mentioned conductor layer of this through hole.

The manufacture method of 3 described multi-layer printed circuit boards of invention is characterized in that, has the operation of following (a)～(d) at least:

(a) on the two sides of core substrate, form lower interlayer resin insulating layers operation,

(b) form to connect the through hole of above-mentioned core substrate and above-mentioned lower interlayer resin insulating layers operation,

(c) on above-mentioned lower interlayer resin insulating layers, form the upper strata interlayer resin insulating layers operation,

(d) on the interlayer resin insulating layers of above-mentioned upper strata, form the operation in switching hole, directly over the part of above-mentioned through hole, form the operation in the switching hole that is connected with external connection terminals.

The manufacture method of 4 described multi-layer printed circuit boards of invention is characterized in that, has the operation of following (a)～(g) at least:

(c) in above-mentioned through hole, fill filler operation,

(d) grind the filler that overflows from above-mentioned through hole the planarization operation,

(e) form to cover above-mentioned filler from the operation of the conductor layer that exposes face of above-mentioned through hole,

(f) on above-mentioned lower interlayer resin insulating layers, form the upper strata interlayer resin insulating layers operation,

(g) on the interlayer resin insulating layers of above-mentioned upper strata, form the operation in switching hole, directly over the part of above-mentioned through hole, form the operation in the switching hole that is connected with external connection terminals.

Manufacture method for 3 multi-layer printed circuit board of 1 multi-layer printed circuit board of invention and invention, be form through hole so as to run through core substrate and the two sides of this core substrate on the interlayer resin insulating layers that forms, directly over through hole, form the switching hole that is connected with external connection terminals.For this reason, through hole and switching hole become linearity ground and shorten distribution length, can improve the transfer rate of signal.In addition, because through hole is direct connection with the switching hole that is connected with external connection terminals, so connection reliability is good.

For the manufacture method of 4 multi-layer printed circuit board of 2 multi-layer printed circuit board of invention and invention, be form through hole so as to run through core substrate and the two sides of this core substrate on the interlayer resin insulating layers that forms, directly over through hole, form the switching hole.For this reason, through hole becomes with the switching hole and is connected shortening distribution length point-blank, can improve the transfer rate of signal.In addition, because through hole directly connects with the switching hole that is connected with external connection terminals, and form the hole of transferring on the conductor layer of filler in covering through hole, this through hole is by grinding-flatening, so connection reliability is good.

5 of invention is to form interlayer insulating film on the two sides of core substrate, and imposes the through hole that connects this substrate, the potting resin packing material, and then in the multi-layer printed circuit board of lamination interlayer insulating film and conductor circuit, it is characterized in that,

In above-mentioned resin filling materials, cooperate 10～50% epoxy resin, curing agent, inorganic particulate.

6 of invention is to form interlayer insulating film on the two sides of core substrate, imposes the through hole that connects this substrate, and the potting resin packing material covers plating, and then in the multi-layer printed circuit board of lamination interlayer insulating film and conductor circuit, it is characterized in that,

7 of invention, it is characterized in that invention 5 or 6 in, above-mentioned inorganic particulate is cooperate aluminium compound, calcium compound, potassium compound, magnesium compound, silicon compound any more than a kind.

At first, the 1st, by making the use level of suitable inorganic particulate, make the coefficient of thermal expansion of resin filler and the coefficient of thermal expansion of the resin film of resin substrate that forms core substrate and interlayer resin insulating layers obtain coupling, even so under thermal cycle conditions, do not produce the stress that causes because of thermal contraction yet.For this reason, do not crack.In addition, in resin film, can impregnation form the particle of the solubility of asperities by roughening treatment.Therefore, if the use level of inorganic particulate then can not be mated greater than 50% o'clock.

The 2nd, also show after filling packing material, in the grinding step that carries out for planarization, grind easily.If the use level of inorganic particulate can only be carried out mechanical lapping by pouncing paper greater than 50%, carry out planarization.Its reason is the resin film for the top layer of core substrate, and the reinforcing material of not impregnation glass epoxy resin etc. is if compare the intensity variation with resin substrate.Therefore, carry out mechanical lapping (for example being meant by resinder grinding etc.) by pouncing paper, resin film is not wear-resisting.On resin film, produce be full of cracks, crackle for this reason.In addition, because the resin film damaged, so the solubility particle also comes off.Even therefore form alligatoring face, also can not get desirable performance.Therefore, when carrying out milled processed, can only describe the top layer of core substrate, remove the resin filler and planarization with the nonwoven fabrics of the grinding-material that adds polishing agent etc.

The 3rd, show also directly over through hole, to form when covering coating that greater than 50% o'clock, the administered dose of catalyst reduced or the electroplating film reaction stops as if inorganic particulate.Said inorganic particulate does not combine with the catalyst coordination.For this reason, reduce for the son amount.In addition, even form electroplating film,,, stop so causing the electroplating film reaction because the not tendency of contact plating liquid is arranged if inorganic particulate is in surplus.

For less than 10%, the matching effect of coefficient of thermal expansion disappears, during the potting resin filler, owing to do not remain in the through hole, so run off from opposing face.

Preferred range is that the mix proportion with inorganic particulate makes 20～40%.Even when particle coacervation, also can avoid above-mentioned shortcoming for this reason.

8 of invention, its technical characterictic be, invention 5 or 6 in, above-mentioned inorganic particulate be in circle, ellipse, broken shape, the polygonal any one.

Preferably do not form circle, ellipse of particle edged surface etc.Can not cause the cause of crackle etc. like this owing to particle.In addition, the particle diameter of inorganic particulate preferably uses in the scope of 0.01～5 μ m.For less than 0.01 μ m the time, particle filled composite is cancelled out each other.If during greater than 5 μ m, the mix proportion of often regulating in the resin is difficult.

9 of invention, its technical characterictic be, invention 5 or 6 in, impose roughened layer for the conductor layer of above-mentioned through hole.

Preferably on the conductor layer of through hole, impose roughened layer.Like this, can prevent that the expansion of resin filler from shrinking, can not push interlayer insulating film and lid coating that the through hole upper strata forms.As the layer that roughened layer forms, the formation institute stratification of the formation of the roughened layer of handling, electroplating by redox processing, melanism, the roughened layer by etch is arranged.

10 of invention is to pass through the manufacture method that following (a)～(e) step forms the multi-layer printed circuit board of interlayer insulating film at least.

(a) the through hole formation operation in perforation is shown-

(b) cooperate the filling work procedure of the resin filler of 10～50% epoxy resin, inorganic particulate-

(c) drying process, grinding step-

(d) curing process-

(e) lid coating operation-

11 of invention is according to 10 of invention, and its technical characterictic is, in grinding step, carries out at least 1 time or the several polishing process.

12 of invention is according to 10 or 11 of invention, and its technical characterictic is in above-mentioned (a) operation, to form the operation of roughened layer.

In order to achieve the above object, 13 of invention is the mutual laminations of interlayer resin insulating layers and conductor layer, and the overlapping layers that connects between each conductor layer with the switching hole is the multi-layer printed circuit board that forms on the two sides of core substrate, and its technical characterictic is,

Form through hole that the potting resin packing material constitutes so that connect the lower interlayer resin insulating layers that forms on the two sides of above-mentioned core substrate and this core substrate,

Be formed on and fill the switching hole that above-mentioned resin filling materials constitutes in the above-mentioned lower interlayer resin insulating layers.

13 multi-layer printed circuit board for invention, because through hole is filled identical resin filling materials with the switching hole, thus can constitute inexpensively, in addition, because can keep in the through hole equably and the switching hole in intensity, so can improve the reliability of multi-layer printed circuit board.

Resin can be heat reactive resin, thermoplastic resin or their compound of epoxy resin, phenol resin, fluororesin, cyanate resin, vistanex, polyphenylene oxide resin etc., also can be to contain inorganic fillers such as silica, aluminium oxide etc. to regulate coefficient of thermal expansion at resin.In addition, also can use paste based on the metallic stuffing of electroconductive resin, gold, silver etc.And then also can be above-mentioned various compounds.

14 of invention, be according to invention 13 in, its technical characterictic is, forms the conductor layer that resin filler in the switching hole that covering is filled in above-mentioned lower interlayer resin insulating layers exposes face,

Directly over the switching hole, form the switching hole by conductor layer.

For 14 of invention, form the conductor layer that exposes face that covers the filler in the switching hole that is filled in lower interlayer resin insulating layers, directly over the switching hole, form the switching hole by this conductor layer.For this reason, can be formed flatly the switching hole of this lower floor, can improve and the closely connected property in the switching hole that on this switching hole, forms and the reliability of multi-layer printed circuit board.

15 of invention is to provide the manufacture method of multi-layer printed circuit board, it is characterized in that, has the operation of following (a)～(g) at least:

(b) above-mentioned core substrate and above-mentioned lower interlayer resin insulating layers form the through hole that runs through operation,

(c) on above-mentioned lower interlayer resin insulating layers, form the opening in switching hole operation,

(d) on above-mentioned through hole and above-mentioned opening, form conducting film, make the operation in through hole and switching hole.

(e) above-mentioned through hole and the switching hole in the potting resin packing material operation,

(f) flatly grind operation from above-mentioned through hole and the resin filler that overflows of switching hole,

(g) form the operation of the above-mentioned resin filler of covering from the conductor layer that exposes face in above-mentioned through hole and switching hole.

16 of invention is to provide the manufacture method of multi-layer printed circuit board, it is characterized in that, has the operation of following (a)～(i) at least:

(b) on above-mentioned core substrate and above-mentioned lower interlayer resin insulating layers, form the through hole run through operation,

(c) on above-mentioned lower interlayer resin insulating layers, form to constitute the opening in switching hole operation,

(f) grind the resin filler that overflows from above-mentioned through hole and switching hole the planarization operation,

(g) form to cover above-mentioned resin filler from the operation of the conductor layer that exposes face in above-mentioned through hole and switching hole,

(h) on above-mentioned lower interlayer resin insulating layers, form the upper strata interlayer resin insulating layers operation,

(i) on the interlayer resin insulating layers of above-mentioned upper strata, form the operation in switching hole, directly over the part in above-mentioned switching hole, form the operation in switching hole.

Manufacture method for 16 multi-layer printed circuit board of 15 and invention of invention, because through hole is filled identical resin filling materials with the switching hole, grind simultaneously, so can constitute inexpensively, in addition, because can keep in the through hole equably and the switching hole in intensity, so can improve the reliability of multi-layer printed circuit board.In addition, owing to formed the switching hole on upper strata on the conductor layer of the filler in the switching hole that has covered by grinding-flatening, so connection reliability is good.

In order to achieve the above object, 17 of invention is to provide the manufacture method of multi-layer printed circuit board, it is characterized in that, has the operation of following (a)～(e) at least:

(d) when the purification of carrying out above-mentioned through hole with acid or oxidant (デスミャ) is handled, carry out the roughening treatment on lower interlayer resin insulating layers surface operation,

(e) on above-mentioned through hole and above-mentioned opening, form conducting film, make through hole and the switching hole operation,

Manufacture method for 17 multi-layer printed circuit board of invention, owing to carry out roughening treatment being carried out on the purified treatment and the lower interlayer resin insulating layers surface of through hole simultaneously by oxidant, so can reduce manufacturing process, make multi-layer printed circuit board at an easy rate.

18 of invention, its technical characterictic be, invention 17 in, above-mentioned core substrate is to be made of any in glass epoxy resin, FR4, FR5, the BT resin,

Above-mentioned lower interlayer resin insulating layers contains a kind of in the epoxy resin, phenol resin, polyimide resin, polyphenylene resin, vistanex, fluororesin at least,

Above-mentioned oxidant contains any in chromic acid or the permanganate.

For 18 of invention, core substrate is to be made of any in glass epoxy resin, FR4, FR5, the BT resin,

Lower interlayer resin insulating layers contains a kind of in the epoxy resin, phenol resin, polyimide resin, polyphenylene resin, vistanex, fluororesin at least,

Oxidant contains any in chromic acid or the permanganate.For this reason, can carry out on core substrate, having formed the purified treatment of through hole of lower interlayer resin insulating layers and the roughening treatment of this lower interlayer resin insulating layers simultaneously.

In order to achieve the above object, 21 of invention is to provide the manufacture method of multi-layer printed circuit board, its technical characterictic to be, has the operation of following (a)～(d) at least:

(a) on core substrate, form through hole operation,

(b) in above-mentioned through hole, form roughened layer operation,

(c) grind above-mentioned through hole contact surface, the operation of planarization,

(d) operation of potting resin packing material formation resin bed in above-mentioned through hole.

For 21 of invention, in through hole, behind the formation roughened layer, grind above-mentioned through hole contact surface, planarization.Thus, when being filled into resin filling materials in the through hole, can prevent that resin filling materials from flowing out along the roughened layer that forms (anchor point) on the contact-making surface of through hole.Therefore, the packing material in the through hole can be formed smoothly, the reliability of the distribution that on the upper strata of through hole, forms can be improved.

For 22 invention of invention, be according to 21 of invention, its technical characterictic is that above-mentioned roughened layer is a copper oxide.

For 23 invention of invention, be according to 21 of invention, its technical characterictic is that above-mentioned roughened layer forms by etch.

For 24 invention of invention, be according to 21 of invention, its technical characterictic is that above-mentioned roughened layer is the acicular alloy layer that copper-nickel-phosphorus constitutes.

For invention 22, invention 23, invention 24, the roughened layer that in through hole, forms, preferably use handle by melanism-reduction form copper oxide, form the acicular alloy layer that constitutes by copper-nickel-phosphorus and etch handle in any method form.Thus, can improve the closely connected property of the conductor circuit and the resin filling materials of through hole inwall.

25 invention of invention, be according to 21 of invention, it is characterized in that above-mentioned resin filling materials is select in the mixture by the mixture of the mixture of epoxy resin and organic filler, epoxy resin and inorganic filler and epoxy resin and inorfil any.

For 25 of invention, resin filling materials, that preferably selects in the mixture by the mixture of mixture, epoxy resin and the inorganic filler of epoxy resin and organic filler and epoxy resin and inorfil is any.Regulate coefficient of thermal expansion thus with core substrate.

The simple declaration of figure

Fig. 1 is the manufacturing procedure picture of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 2 is the manufacturing procedure picture of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 3 is the manufacturing procedure picture of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 4 is the manufacturing procedure picture of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 5 is the manufacturing procedure picture of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 6 is the sectional drawing of the multi-layer printed circuit board that relates to of the 1st embodiment.

Fig. 7 is the chart of the evaluation result that relates to of expression the 1st embodiment and comparative example.

Fig. 8 is the manufacturing procedure picture of the printing distributing board that relates to of the 2nd embodiment of the present invention.

Fig. 9 is the manufacturing procedure picture of the printing distributing board that relates to of the 2nd embodiment.

Figure 10 is the manufacturing procedure picture of the printing distributing board that relates to of the 2nd embodiment.

Figure 11 is the manufacturing procedure picture of the printing distributing board that relates to of the 2nd embodiment.

Figure 12 is the manufacturing procedure picture of the printing distributing board that relates to of the 2nd embodiment.

Figure 13 is the sectional drawing of the printing distributing board that relates to of the 2nd embodiment.

Figure 14 is the manufacturing procedure picture of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 15 is the manufacturing procedure picture of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 16 is the manufacturing procedure picture of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 17 is the manufacturing procedure picture of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 18 is the manufacturing procedure picture of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 19 is the sectional drawing of the printing distributing board that relates to of the 1st variation of the 2nd embodiment.

Figure 20 is the sectional drawing of the printing distributing board that relates to of the 2nd variation of the 2nd embodiment.

Figure 21 is the evaluation result chart of expression embodiment of the present invention and comparative example.

Figure 22 is the sectional drawing of the multi-layer printed circuit board that relates to of known technology.

The preferred plan that carries out an invention

The 1st embodiment

Below, embodiment of the present invention are described with reference to the accompanying drawings.

At first, Fig. 6 of referential expression vertical section illustrates the pie graph of the multi-layer printed circuit board of the 1st embodiment of the present invention.

For this multi-layer printed circuit board 10, form superimposed wiring layer 80U, 80D at the surface and the inner face of core substrate 30.This superimposed wiring layer 80U, 80D are that the anti-flux layer 70 that forms on the upper strata interlayer resin insulating layers 60 that forms of the switching hole 66 by the lower interlayer resin insulating layers 50 that forms of switching hole 46, upper strata and the upper strata interlayer resin insulating layers 60 constitutes.Peristome 71 by this anti-flux layer 70, on the switching hole 66 of upside, form the soldering salient point (external connection terminals) 76 that is connected usefulness with IC chip (not shown go out), on the switching hole 66 of downside, connecting the conductivity connecting pin (external connection terminals) 78 that is connected usefulness with subboard (not shown go out).

In the 1st embodiment, connect the through hole 36 of this superimposed wiring layer 80U, 80D, form with perforation core substrate 30 and lower interlayer resin insulating layers 50.Potting resin filler 54 in this through hole 36 covers coating 58 peristome setting.Equally, potting resin filler 54 in the switching hole 46 that forms in lower interlayer resin insulating layers 50 covers coating 58 peristome setting.

For the 1st embodiment,, directly over through hole 36, form switching hole 66 to connect core substrate 30 and lower interlayer resin insulating layers 50 formation through holes 36.Therefore, through hole 36 and switching hole 66 make linearity and shorten distribution length, can improve the transfer rate of signal.In addition, owing to directly connect through hole 36 and the switching hole 66 that is connected external connection terminals (soldering salient point 76, conductivity connecting pin 78), so connection reliability is good.Particularly for the 1st embodiment, as hereinafter described, because after grinding filler 54 planarizations that will be filled in the through hole 36, set the lid coating (conductor layer) 58 that covers this filler 54, form switching hole 66 thereon, so the flatness height on through hole 36 surfaces, the connection reliability in this through hole 36 and switching hole 66 is good.

In addition, in the multi-layer printed circuit board of the 1st embodiment, because identical resin 54 is filled in the switching hole 46 in through hole 36 and lower floor, grind simultaneously, level and smooth this potting resin 54, so can constitute inexpensively, in addition because can keep in the through hole equably and the switching hole in intensity, so can improve the reliability of multi-layer printed circuit board.In addition, as hereinafter described, because by after grinding the filler 54 to be filled in switching hole 46 and carrying out planarization, set the lid coating (conductor layer) 58 that covers this filler 54, form switching hole 66, upper strata thereon, so the flatness height on lower floor switching 46 surfaces, hole, the connection reliability in this lower floor switching hole 46 and switching hole 66, upper strata is good.

And then, as hereinafter described, multi-layer printed circuit board for the 1st embodiment, in manufacturing process, owing to the purified treatment of the through hole 35 that constitutes through hole 36 by oxidant simultaneously and the roughening treatment on lower interlayer resin insulating layers surface 40, so can reduce operation, make at an easy rate.

The manufacture method of this multi-layer printed circuit board 10 then, is described with reference to figure 1～5.

(1) the deposited copper laminated plate 30A of the Copper Foil 32 of the two sides superimposed layer 18 μ m of the substrate 30 that will constitute at glass epoxy resin, FR4, FR5 or BT (Bismaleimide Triazine) resin by thickness 0.8mm is as original material (Fig. 1 (A)).At first, by this deposited copper laminated plate etch is become diagram shape, form internal layer copper figure 34 (Fig. 1 (B)) on the two sides of substrate.

(2) wash by the substrate 30 that will form internal layer copper figure 34 after, under the oxygen concurrent conditions of injection or bubbling etc., make copper complex and the effect of organic acid etching solution of containing, form the processing in hole by the copper conductor of dissolving conductor circuit, roughened layer 38 (Fig. 1 (c)) is set on the surface of internal layer copper figure 34.

In addition, also can roughened layer be set by the alloy of OR processing or electroless plating.The roughened layer that forms, the preferably scope of 0.1～5 μ m.As long as in its scope, just be difficult to cause peeling off of conductor circuit and interlayer resin insulating layers.

Copper complex can be the copper complex of azole.The copper complex of this azole is that the oxidant as oxidized metal copper etc. works.As azole, can be diazole, triazole, tetrazolium.Wherein, can be imidazoles, glyoxal ethyline, 2-ethyl imidazol(e), 2-ethyl-4-methylimidazole, 2-phenylimidazole, 2-(11) alkyl imidazole etc.The copper complex formazan addition of azole, preferably 1～15 weight %.So dissolubility and excellent in stability.

In addition, for dissolved oxygen copper, organic acid is engaged in the copper complex of azole.Among the group that concrete example can be made up of formic acid, acetate, propionic acid, butyric acid, valeric acid, caproic acid, acrylic acid, crotonic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, maleic acid, benzoic acid, glycolic, lactic acid, malic acid, sulfamic acid select at least a kind.Organic acid content can be 0.1～30 weight %.This is the dissolubility for the copper of keeping oxidized, and guarantees steady dissolution.

The cuprous complex compound that produces dissolves under the effect of acid, is combined into copper complex with oxygen, is used further to the oxidation of copper.

In addition, for the dissolving of auxiliary copper and the oxidation of azole, also can be with the halogen ion, for example fluorine ion, chloride ion, bromide ion etc. join in the etchant.For the present invention, can add hydrochloric acid, sodium chloride etc., supply with the halogen ion.The halogen ionic weight can be 0.01～20 weight %.Be for the closely connected property of the alligatoring face that forms and interlayer resin insulating layers good.

The copper complex of azole and organic acid (being the halogen ion as required) be dissolved in regulate etching solution in the water.In addition, use commercially available etching solution, for example Merck (メ Star Network) society's system, trade name " its paper tinsel of Merck dust (メ Star Network エ Star チボ Application ト) " can form alligatoring face of the present invention.

(3) resin film 50 α that will constitute lower interlayer resin insulating layers are warmed up to 50～150 ℃ of temperature on one side, on one side with 5kgf/cm ²Pressure vacuum crimping lamination after, paste to pay on the surface of this substrate 30 (Fig. 1 (D)).

As this resin film, contain slightly solubility resin, soluble resin particle, curing agent, other composition.Below be illustrated respectively.

The resin film that uses in manufacture method of the present invention is the film that will be dispersed in for the particle of acid or oxidant solubility (below, claim the solubility particle) in the resin for acid or oxidant slightly solubility (below, claim the slightly solubility resin).

In addition, " slightly solubility ", " solubility " term that said the present invention uses is meant when flooding identical time in the solution of being made up of identical acid or oxidant, relatively dissolution velocity is fast, is called " solubility ", dissolution velocity is slow relatively, is called " slightly solubility ".

As above-mentioned solubility particle, for example can enumerate resin particle for acid or oxidant solubility (below, claim the soluble resin particle), for the inorganic particulate of acid or oxidant solubility (below, claim the solubility inorganic particulate), for the metallic of acid or oxidant solubility (below, claim the soluble metal particle) etc.The particle of these solubilities can use separately, also can use more than 2 kinds.

Shape for the particle of above-mentioned solubility is not particularly limited, and can enumerate spherical, broken shape etc.In addition, the shape of the particle of above-mentioned solubility, preferably identical shape.Be because can form the cause of concavo-convex alligatoring face with even rugosity.

As the average grain diameter of the particle of above-mentioned solubility, preferably 0.1～10 μ m.As long as in this particle size range, also can contain different-grain diameter more than 2 kinds.That is be to contain solubility particle that solubility particle that average grain diameter is 0.1～0.5 μ m and average grain diameter be 1～3 μ m etc..Thus, can form more complicated alligatoring face, also good with the closely connected property of conductor circuit.In addition, in the present invention, the particle diameter of said solubility particle is meant the length of long part of solubility particle.

As above-mentioned soluble resin particle, can enumerate by the hard curable resin of heat, thermoplastic resin etc. and form, in the time of in being immersed in the solution that acid or oxidant form,, have no particular limits as long as more fireballing than above-mentioned slightly solubility dissolving resin.

Object lesson as above-mentioned soluble resin particle, for example can enumerate and form by epoxy resin, phenol resin, polyimide resin, polyphenylene resin, vistanex, fluororesin etc., can form by a kind of in these resins, also can form by the mixture of the resin more than 2 kinds.

In addition, as above-mentioned soluble resin particle, can use the resin particle of forming by rubber.As above-mentioned rubber, for example can enumerate polybutadiene rubber, epoxide modified, ammonia is ester modified, the various modified polybutadiene rubbers of (methyl) acrylonitrile modification etc., contain (methyl) ABS resin diene rubber of carboxyl etc.

By using these rubber, can easily the soluble resin particle be dissolved in acid or the oxidant.Just the time with acid dissolving soluble resin particle, even also solubilized of the acid beyond the strong acid, when using oxidant dissolving soluble resin particle, even also solubilized of the more weak permanganate of oxidizing force.In addition, when using chromic acid, also can the low concentration dissolving.For this reason, acid or oxidant do not remain on the resin surface, as described later, after alligatoring face forms, when paying catalyst such as palladium bichloride, catalyst or the oxidized situation of catalyst can not take place not pay.

As above-mentioned solubility inorganic particulate, for example can enumerate at least a kind of particle of forming selecting among the group who forms by aluminium compound, calcium compound, potassium compound, magnesium compound and silicon compound.

As above-mentioned aluminium compound, for example can enumerate aluminium oxide, aluminium hydroxide etc., as above-mentioned calcium compound, for example calcium carbonate, calcium hydroxide etc. can be enumerated,, potash etc. can be enumerated as above-mentioned potassium compound, as above-mentioned magnesium compound, magnesium oxide, dolomite, basic magnesium carbonate etc. can be enumerated,, for example silicon dioxide, zeolite etc. can be enumerated as above-mentioned silicon compound.These can use separately, also can 2 kinds and usefulness.

As above-mentioned soluble metal particle, for example can enumerate at least a kind of particle of forming selecting among the group who forms by copper, nickel, iron, zinc, lead, gold, silver, aluminium, magnesium, calcium and silicon.In addition, these soluble metal particles, in order to ensure insulating properties, also can be by lining top layers such as resins.

When the above-mentioned solubility particle that is mixed with two or more, as the combination of 2 kinds of solubility particles that mix, the preferably combination of resin particle and inorganic particulate.Because both conductivity is all low, so when can guarantee the insulating properties of resin film, regulating thermal expansion easily with the slightly solubility interlaminar resin, crackle is not taking place on the interlayer resin insulating layers that constitutes by resin film, between interlayer resin insulating layers and conductor circuit, do not peeling off.

As above-mentioned slightly solubility resin, when using acid or oxidant on interlayer resin insulating layers, to form alligatoring face,, just be not particularly limited so long as can keep the shape of alligatoring face, for example can enumerate heat-curing resin, thermoplastic resin, their compound etc.In addition, also can be on these resins, to pay photosensitive photoresist.By using photoresist, can use exposure, developing to handle and on interlayer resin insulating layers, form switching hole opening.

In these, preferably contain heat-curing resin.This is because also can keep the cause of the shape of alligatoring face by electroplate liquid or various heat treated.

As the object lesson of above-mentioned slightly solubility resin, for example can enumerate epoxy resin, phenol resin, phenoxy resin, polyether sulfone (PES), polyimide resin, polyphenylene resin, vistanex, fluororesin etc.These resins can use separately, also can more than 2 kinds and use.

And then, more preferably in a molecule, the epoxy resin with the epoxy radicals more than 2.Owing to not only can form above-mentioned alligatoring face, thermal endurance etc. are also good, so even under thermal cycle conditions, stress does not take place in metal level yet concentrate, do not cause peeling off of metal level etc.

As above-mentioned epoxy resin, for example can enumerate cresols novolac type epoxy resin, bisphenol A type epoxy resin, bisphenol f type epoxy resin, phenolic resin varnish type epoxy resin, alkyl phenol phenolic resin varnish type epoxy resin, bisphenol f type epoxy resin, naphthalene type epoxy resin, dicyclopentadiene-type epoxy resin, phenols and have the epoxides, three-glycidyl based isocyanate, alicyclic epoxy resin etc. of condensation product of the aromatic aldehyde of phenol hydroxyl.These can use separately, also can more than 2 kinds and use.Thus, can become good materials such as thermal endurance.

In the resin film that the present invention uses, above-mentioned solubility particle preferably roughly is evenly dispersed in the above-mentioned slightly solubility resin.This is owing to can form and have the concavo-convex alligatoring face of even rugosity, even form switching hole and through hole in resin film, also can guarantee the closely connected property of the metal level of the conductor circuit that forms thereon.In addition, also can only use the resin film that contains the solubility particle in the top layer part that forms alligatoring face.Thus, because can be beyond the part of the top layer of resin film, so can guarantee insulating properties between between the conductor circuit of interlayer resin insulating layers by acid or oxidant effect.

In above-mentioned resin film, be dispersed in the use level of the solubility particle in the slightly solubility resin, with respect to resin film, 3～40 weight % preferably.The use level of solubility particle is during less than 3 weight %, sometimes can not form and have desirable concavo-convex alligatoring face, if during greater than 40 weight %, when using acid or oxidant dissolving solubility particle, be dissolved into the deep of resin film, can not keep often becoming the reason of short circuit by the insulating properties between the conductor circuit of the interlayer resin insulating layers that constitutes by resin film.

Above-mentioned resin film preferably beyond above-mentioned solubility particle, above-mentioned slightly solubility resin, contains curing agent, other one-tenth grades.

As above-mentioned curing agent, for example can to enumerate imidazoles and be curing agent, amine and be curing agent, guanidine be curing agent, with the epoxy adduct of these curing agent or the organic phosphine based compound of these curing agent microencapsulations person, triphenylphosphine tetraphenyl  tetraphenyl borate salts etc. etc.

The content of above-mentioned curing agent, with respect to resin film, 0.05～10 weight % preferably.During less than 0.05 weight %, because the curing of resin film is insufficient, often the degree in acid or the oxidant immersion resin film is big, damages the insulating properties of resin film.On the other hand, if during greater than 10 weight %, often Guo Sheng curing agent component is formed modification with resin, causes the reliability reduction.

As above-mentioned other composition, for example can enumerate the filler of inorganic compound that the alligatoring face that do not influence forms or resin etc.As above-mentioned inorganic compound, for example can enumerate silicon dioxide, aluminium oxide, dolomite etc., as above-mentioned resin, for example can enumerate polyimide resin, polyacrylic resin, polyamide-imide resin, polyphenylene resin, melamine resin, olefin-based resin etc.By containing these fillers, scalable thermal coefficient of expansion or raising thermal endurance, drug resistance etc., the performance of raising printing distributing board.

In addition, above-mentioned resin film also can contain solvent.As above-mentioned solvent, for example can enumerate the aromatic hydrocarbon etc. of ketone, ethyl acetate, butyl acetate, Cellosolve ethyl ester or toluene, the dimethylbenzene etc. of acetone, methylethylketone, cyclohexanone etc.These can use separately, also can 2 kinds and usefulness.

(4) then, pasting on the core substrate 30 of paying resin film 50 α, wearing the perforation through hole 35 (Fig. 1 (E)) of diameter 300 μ m by drilling machine.

(5) then, on resin film 50 α, wear the switching hole opening 52 (Fig. 2 (A)) of diameter 80 μ m with carbonic acid, excimers, YAG or UV laser.Make the resin film hot curing form lower interlayer resin insulating layers 50 then.The switching hole also can be by laser zone processing or add mask after be processed to form with the zone of laser.Or it also can be hybrid laser (referring to take the combination of carbonic acid laser and excimer laser).Also available laser forms through hole and switching hole together.

(6) then, oxidant with chromic acid or permanganate (potassium permanganate, sodium permanganate) composition, when the perforation that forms carried out purified treatment with through hole 35, carry out the surface coarsening processing (Fig. 2 (B)) of lower interlayer resin insulating layers 50 on core substrate 30 and lower interlayer resin insulating layers 50.At this, under 65 ℃ of temperature, handle.This processing can be carried out 40～70 ℃ scope.

Form the alligatoring face of this interlayer resin insulating layers in the scope of 0.5～5 μ m.As long as in this scope, just can guarantee adherence, operation can be removed conductor layer in the back.

The multi-layer printed circuit board of the 1st embodiment, core substrate 30 is formed by any a kind in FR4, FR5, the BT resin, and lower interlayer resin insulating layers 50 contains at least a kind in epoxy resin, phenol resin, polyimide resin, polyphenylene resin, vistanex, the fluororesin.For this reason, the available oxidant that is made of chromic acid or permanganate carries out the roughening treatment of purified treatment He this lower interlayer resin insulating layers 50 of through hole 35 simultaneously, owing to reduce operation, can make multi-layer printed circuit board at an easy rate.

The electroless plating film is to form under the scope of 0.1～5 μ m.So long as this scope can all form film, etch is removed easily.

(7) in alligatoring the surface of interlayer resin insulating layers 50 on surface on, pay palladium catalyst, in the electroless plating aqueous solution, form electroless plating copper film 42 (Fig. 2 (C)).At this, form the electroless plating copper film, but use sputter, also can form copper or nickel flashing.In addition, as carry out dried on the top layer, also can carry out plasma, UV, corona treatment.Thus with surfaction

(8) after the substrate that will form electroless plating copper film 42 is washed, form the anti-plate layer 43 (Fig. 2 (D)) of defined figure.

(9) then, substrate is immersed in the metallide liquid,, forms electrolytic copper plating film 44 (Fig. 2 (E)) by electroless plating copper film 42 streaming currents.

(10) peel off with KOH and remove anti-plate layer 43, peel off electroless plating copper film 42 under the anti-plate layer, form the switching hole 46 and the through hole 36 (Fig. 3 (A)) that constitute by electroless plating copper film 42 and electrolytic copper plating film 44 by photoetch.

(11) in switching hole 46 and through hole 36, form roughened layer (alloy that constitutes by Cu-Ni-P) 47 (Fig. 3 (B)) by electroless plating.Also can also can form roughened layer without this electroless plating copper by etch (for example fluid,matching injection or the dipping by copper complex and acylate carries out etching) or by the OR processing.

(12) (12) are in through hole 36 and in the switching hole 46, mounting has the opening mask that cooperates with each diameter, be filled in the resin filler 54 that viscosity adjustment under 23 ℃ becomes 50Pa.S by printing, 100 ℃ of down dry 20 minutes (Fig. 3 (C)) of the temperature in drying oven.For the 1st scheme, owing to simultaneously identical filler is filled in through hole 36 and the switching hole 46, so can cut down manufacturing process.

At this,, can use following feedstock composition as the resin filler.

Resin combination

By with Bisphenol F type epoxy monomer (oiling shell system, molecular weight 310, YL983U) 100 weight portions, at the SiO of the average grain diameter 1.6 μ m of surface applied silane coupling agent ₂Spheroidal particle (A Demake society system, CRS1101-CE, at this, it is following that the size of maximum particle makes the thickness (15 μ m) of internal layer copper figure described later) 72 weight portions, imidazole curing agent (changing into system of four countries, 2E4MZ-CN) 6.5 weight portions, levelling agent (Sa Nuobeike society system, handkerchief are reined in that S4) 1.5 weight portions mix, and under 23 ± 1 ℃, the viscosity adjustment of its mixture is become 36000～49000cp and obtain.

(13) will the be through with single face of substrate 30 of processing of above-mentioned (12) grinds, so that the surface smoothingization of the resin filler 54 that comes out from the opening of switching hole 46, through hole 36, then, in order to remove owing to grinding that the scar cause carries out 1 time or repeatedly polishing is ground.Other local faces for substrate carry out a series of like this grinding (Fig. 3 (D)) too.

In addition, only remove the resin filler and extrude composition, also can carry out planarization with the polishing grinding.

As the reason that can grind with polishing, be because on interlayer resin insulating layers, cooperate various particles, the cause that when grinding, does not come off etc.

Then, 100 ℃ of following heat treated 1 hour, at 150 ℃ of following heat treated 1 hour, cured resin filler 54.

In through hole, form the resin filling materials layer of the resin filler that contains epoxy resin, curing agent and inorganic particulate.

Be not particularly limited for above-mentioned epoxy resin, but preferably from the group who forms by bisphenol-type epoxy resin and phenol aldehyde type epoxy resin select at least a kind.This is because bisphenol-type epoxy resin passes through to select the resin of A type or F type, even do not use yet its viscosity of scalable of retarder thinner, phenolic resin varnish type epoxy resin thermal endurance and drug-resistant type under high strength is good, even in the strong alkali solution of electroless plating etc., also do not decompose, in addition, the cause that also is difficult to thermal decomposition.

As bisphenol-type epoxy resin, preferably bisphenol A type epoxy resin or bisphenol f type epoxy resin, from can be under low viscosity and solvent-freely use down, bisphenol f type epoxy resin preferably.

In addition, as above-mentioned phenolic resin varnish type epoxy resin, preferably from the group who forms by phenol novolak type epoxy resin and cresols phenolic resin varnish type epoxy resin select at least a kind.

In addition, also bisphenol-type epoxy resin and phenolic resin varnish type epoxy resin can be mixed use.

At this moment, the mixing ratio of bisphenol-type epoxy resin and cresols phenolic resin varnish type epoxy resin for example, preferably 1/1～1/100.In this scope, can suppress the viscosity rising by mixing.

Curing agent for being contained in the resin filler is not particularly limited, and can use known in the past curing agent, but preferably imidazoles is that curing agent or amine are curing agent.

When using these curing agent, be because the shrinkage degree when solidifying is little, constitute the conductor layer of through hole and the good especially cause of closely connected property of resin filler layer.

In addition, as the inorganic particulate that is contained in above-mentioned resin filler, for example can enumerate and to constitute by aluminium compound, calcium compound, potassium compound, magnesium compound, silicon compound etc.These can use separately, also can more than 2 kinds and use.

As aluminium compound, for example can enumerate aluminium oxide, aluminium hydroxide etc., as calcium compound, for example can enumerate calcium carbonate, calcium hydroxide etc., as potassium compound, for example can enumerate potash etc., as magnesium compound, for example can enumerate magnesium oxide, dolomite, basic magnesium carbonate, talcum etc., as silicon compound, for example can enumerate silicon dioxide, zeolite etc.

The containing ratio of the inorganic particulate in the resin filling materials is 10～50 weight %.Be because as long as in this scope, and interlayer resin insulating layers between scalable thermal coefficient of expansion etc., preferred containing ratio is 20～40 weight %.

The shape of inorganic particulate can be enumerated sphere, garden shape, ellipse, broken shape, polygonal etc.Therein, preferably spherical, garden shape or ellipse.Be owing to can suppress to produce the cause in crack owing to shape with particle.In addition, above-mentioned particle also can be by coatings such as silicon dioxide coupling agents.This is owing to improved the cause of the closely connected property of inorganic particulate and epoxy resin.

In addition, be preferably at least a portion formation alligatoring face on the surface of the conductor layer that constitutes through hole.This is that the expansion when suppressing to be subjected to thermal process is shunk owing to can more improve the closely connected property of this conductor layer and resin filler layer, the cause that more is difficult to peel off between the two etc.The average boldness of alligatoring face, preferably 0.05～5 μ m.Average boldness almost can not obtain the effect of alligatoring face that conductor circuit is made during less than 0.05 μ m, on the other hand, if during greater than 5 μ m, because the kelvin effect of signal when transmitting, the cause of signal delay or signal error might take place.

In the resin filler, except epoxy resin, also can contain other heat-curing resin, thermoplastic resin, photoresist, other compound etc.

As heat-curing resin, can enumerate polyimide resin, phenol resin etc.In addition, as thermoplastic resin, can enumerate the fluororesin, PETG (PET), polysulfones (PSF), polyphenylene sulfide (PPS), thermoplastic poly phenylene ether (PPE), polyether sulfone (PES), Polyetherimide (PEI), PPSU (PPES) of polytetrafluoroethylene (PTFE), tetrafluoroethylene hexafluoro propylene copolymer (FEP), tetrafluoroethylene perfluoroalkyl alkoxy copolymer (PFA) etc., poly-naphthoic acid glycol ester (PEN), polyether-ether-ketone (PEEK), polyolefin, phenoxy resin etc.As photoresist, a part of addition that can enumerate at heat-curing resin has (methyl) acrylic acid of sensitization base etc., also can enumerate acrylic resin etc. as photoresist.These resins can use separately, also can more than 2 kinds and use.In addition, also can use these resin or its compound (being meant the compound of heat-curing resin and thermoplastic resin or photoresist and thermoplastic resin) without epoxy resin.

In addition, except inorganic particulate, but also hybrid resin particle, metallic etc.As resin particle, can enumerate with the resin of heat-curing resin, thermoplastic resin etc. do globulate etc., as metallic, can enumerate the particle of the conductivity of gold, silver, copper etc.These can use separately, also can more than 2 kinds and use.In addition, also can be used for replacing inorganic particulate.

In the resin filler, also can contain the solvent (impregnation solvent-borne type) of NMP (positive methyl pyrrolidone), DMDG (diethylene glycol dimethyl ether), glycerine, cyclohexanol, cyclohexanone, methyl Cellosolve, methyl Cellosolve acetic acid esters, methyl alcohol, ethanol, propyl alcohol, butanols etc., but preferably not contain solvent (no-solvent type) fully.Hope is that the reason of no-solvent type is because after curing, is difficult to the cause of residual bubble in through hole etc.Because residual bubble reduces reliability and connectivity.

(14) on interlayer resin insulating layers 50 surfaces, give palladium catalyst, in the electroless plating aqueous solution, form electroless plating copper film 56 (Fig. 4 (A)).At this, form the electroless plating copper film, but or use sputter, also can form copper or nickel flashing.According to circumstances also can directly carry out metallide.

(15) behind the plated resist that forms the defined figure (not shown go out), after forming electrolytic copper plating film 57, peel off and remove plated resist, peel off electrolytic copper free plated film 56 under the plated resist with photoetch, will be formed on by the lid coating 58 that electroless plating copper film 56 and electrolytic copper plating film 57 constitute on the peristome of switching hole 46 and through hole 36 (Fig. 4 (B)).

(16) on the lid coating 58 of the opening of switching hole 46 and through hole 36, form roughened layer (Cu-Ni-P) 59 (Fig. 4 (C)) by electroless plating.Handle by etch or OR without the plating of this electrolytic copper free and also to form roughened layer.

(17) carry out the operation of above-mentioned operation (3)～(11) repeatedly, can form upper strata interlayer resin insulating layers 60, on this upper strata interlayer resin insulating layers 60, form the switching hole 66 (Fig. 4 (D)) that constitutes by electrolytic copper free plated film 62 and electrolytic copper plated film 64.

(18) then, form anti-weld layer and soldering salient point.The feedstock composition of anti-weld layer is made of following.

Be dissolved in 60 weight % among the DMDG cresols phenolic resin varnish type epoxy resin (Japanese chemical drug system) epoxy radicals 50% acrylic change have photosensitive oligomer (molecular weight a 4000) 46.67g, be dissolved in bisphenol A type epoxy resin (the oiling shell system of 80 weight % of methylethylketone, dust micromicro spy 1001) 15.0g, (four countries change into system to imidazole curing agent, 2E4MZ-CN) 1.6g, polynary acrylic monomer (Japanese chemical drug system as photo-sensitive monomer, R604) 3g, identical polynary acrylic monomer (common prosperity society chemistry system, DPE6A) 1.5g and disperse system defoamer (Sa Nuo Bake society system, S-65) 0.71g, mix, and then for benzophenone (the Northeast chemistry system) 2g of this mixture adding as light trigger, as michler's ketone (the Northeast chemistry system) 0.2g of photosensitizing agent, obtain under 25 ℃, viscosity adjustment being become the anti-paste-shaped welding combination of 2.0Pa.s.

As anti-weld layer, can use various resins, for example can use the acrylate of the acrylate of bisphenol A type epoxy resin, bisphenol A type epoxy resin, phenolic resin varnish type epoxy resin, phenolic resin varnish type epoxy resin is the resin that curing agent or imidazole curing agent etc. have solidified with ammonia.

Particularly opening is set, when forming the soldering salient point, preferably contains " imidazole curing agent " that constitute by " acrylate of phenolic resin varnish type epoxy resin or phenolic resin varnish type epoxy resin " as curing agent at anti-weld layer.

Thickness with 40 μ m on the two sides of the multi-layer printed circuit board that is obtained by above-mentioned (17) applies above-mentioned anti-weld layer composition 70 α (Fig. 5 (A)).

(19) then, 70 ℃ of following dried 20 minutes, 80 ℃ of following dried after 30 minutes, closely connected mounting is depicted the photomask of the thickness 5mm of circle graph sample (mask graph) as, at 1000mJ/cm ²Down exposure of ultraviolet ray, carry out the DMTG developing and handle.And then, under 80 ℃ 1 hour, 100 ℃ 1 hour, 120 ℃ 1 hour, 150 ℃ conditions of 3 hours, carry out heat treated, form anti-weld layer 70 (thickness 20 μ m) (Fig. 5 (B)) with peristome 71 (opening diameter 200 μ m).

(20) then, with multi-layer printed circuit board by nickel chloride 2.3 * 10 ^-1Mol/l, inferior sodium phosphate 2.8 * 10 ^-1Mol/l, natrium citricum 1.6 * 10 ^-1Dipping is 20 minutes in the electroless nickel plating solution of the pH=4.5 that mol/l constitutes, forms the nickel coating 72 of thickness 5 μ m at peristome 71 places.And then by potassium auricyanide 7.6 * 10 ^-3Mol/l, ammonium chloride 1.9 * 10 ^-1Mol/l, natrium citricum 1.2 * 10 ^-1Mol/l, inferior sodium phosphate 1.7 * 10 ^-1Under 80 ℃ condition, flooded 7.5 minutes in the electroless gold plating solution that mol/l constitutes, on nickel coating 72, form the Gold plated Layer 74 (Fig. 5 (C)) of thickness 0.03 μ m.

Above-mentioned example forms nickel, layer of precious metal as the intermediate layer with gold, but except nickel, uses palladium, tin, titanium etc. to form sometimes, except gold, silver, platinum etc. is arranged.In addition, also can form layer of precious metal more than 2 layers.As the surface-treated dried, can carry out plasma, UV, corona treatment.Thus, can improve the fillibility of IC chip with heelpiece.

(23) then, on the peristome 71 of anti-weld layer 70, print soldering paste, under 200 ℃, carry out soft heat, form scolding tin salient point (scolding tin body) 76 on the superincumbent switching hole 66, in addition, by scolding tin 77 conductivity connecting pin 78 (with reference to Fig. 6) are installed on the switching hole 66 of side below.In addition, also can form BGA and replace the conductivity connecting pin.

As scolding tin, can use Sn/Pb, Sn/Sb, Sn/Ag, Sn/Sb/Pb, Sn/Ag/Cu etc.

The fusing point of scolding tin, preferably 180～280 ℃.As long as in this scope, the pin intensity that just can guarantee the conductivity connecting pin is 2, more than the 0Kg/Pin.For less than this scope, pin intensity reduces, if greater than this scope, have with anti-weld layer fuse fall may.Particularly preferably be 200～260 ℃.

More preferably, the scolding tin fusing point of conductivity connecting pin side is than the scolding tin fusing point height of scolding tin salient point side.This is because when flint glass is installed the IC chip, when soft heat, the inclination of conductivity connecting pin or the cause that comes off do not take place.As the example of this combination, be to use Sn/Pb, conductivity connecting pin side to use Sn/Sb in scolding tin salient point side.

Comparative example 1

As a comparative example 1, be and the identical formation of multi-layer printed circuit board of the 1st embodiment shown in Figure 6 to fill copper facing in the switching hole of lower floor side simultaneously and obtain multi-layer printed circuit board.Estimate the multi-layer printed circuit board of the 1st embodiment and comparative example 1 multi-layer printed circuit board the result as shown in Figure 7.

Electrical wiring is to check conducting by detector.To have short circuit or broken string as NG, when will not have as OK.In addition, peel off and expansion is (will-65 ℃/3 minutes+130 ℃/3 minutes repeatedly carry out 1000 circulations as a circulation) after carrying out thermal cycling test, downcut section with microscope (* 100～400) peeling off, expanding by the visual examination interlayer resin insulating layers and the hole of transferring.

For comparative example 1, do not have the surface of complete filling by plating, and form pit in the switching hole of lower floor, reduced connectivity with the switching hole on upper strata.For this reason, the electric part that does not connect often takes place between the switching hole.

In addition, behind thermal cycling test, confirmed on the basis of peeling off between the switching hole place of on interlayer resin insulating layers, also peeling off, expanding.For the multi-layer printed circuit board of the 1st embodiment, above-mentioned connectivity is also no problem, does not also find to peel off or expand.

Comparative example 2

As a comparative example 2, it is the identical formation of multi-layer printed circuit board with the 1st embodiment shown in Figure 6, simultaneously for the filling of through hole, be to fill the resin filling materials that uses in the embodiment and the metal cream of filling based on silver paste in switching hole side obtains multi-layer printed circuit board.Multi-layer printed circuit board for this comparative example 2, because having filled the switching hole 66 of metal cream differs widely with the coefficient of thermal expansion of having filled the through hole 26 of resin filling materials, so the power difference of transmitting from transverse direction on the interlayer resin insulating layers 50 of lower floor, this interlayer resin insulating layers 50 expands or peels off from core substrate 30.In contrast, for above-mentioned embodiment, on the interlayer resin insulating layers 50 of lower floor, do not peel off.

(incite somebody to action-65 ℃/3 minutes+130 ℃/3 minutes if carry out thermal cycling test as 1 circulation, carry out 1000 circulations), for embodiment, connectivity and closely connected property are no problem, but for comparative example 2, owing to the resin filling materials difference becomes fundamental cause the part that reduces closely connected property is arranged, so on interlayer resin insulating layers, confirmed the place of peeling off, peeling off.

Comparative example 3

Roughly the same with embodiment 1, but the use level of silicon dioxide is set at 271 weight portions.The mix proportion of the inorganic particulate in the resin filling materials is set at 71.5 weight %.

Comparative example 4

Roughly the same with embodiment 1, but the use level of silicon dioxide is set at 5.7 weight portions.The mix proportion of the inorganic particulate in the resin filling materials is set at 5.0 weight %.

In comparative example 3, in thermal cycle conditions, in resin filling materials, confirm to have the crack.In addition, in comparative example 4, do not reach flatly in the skin section of resin packed layer and to grind, seen and ground the recess that inadequate part and inorganic particulate come off and cause.In addition, the coating film thickness on the resin filling materials is inhomogeneous, sees and does not separate out phenomenon etc.

The 2nd embodiment

The formation of the printing distributing board that relates to for the 2nd embodiment of the present invention describes with reference to Figure 13 of the section of expression printing distributing board 110.

Printing distributing board 110 is made of core substrate 130 and superimposed wiring layer 180A, 180B.Superimposed wiring layer 180A, 180B are made of interlayer resin insulating layers 150,160.On interlayer resin insulating layers 150, form switching hole 146 and conductor circuit 145, on interlayer resin insulating layers 160, form switching hole 166 and conductor circuit 165.The anti-weld layer 170 of configuration on interlayer resin insulating layers 160.

Below, the manufacture method of the printing distributing board that relates to for the 2nd embodiment of the present invention describes.This for the A. interlayer resin insulating layers of the manufacture method of the printing distributing board that is used for the 2nd embodiment with resin film describe, B. is for resin filling materials, since with the raw material of the used resin filler of the 1st embodiment form identical, so omit explanation.

A. the interlayer resin insulating layers making of resin film

With bisphenol A type epoxy resin (epoxide equivalent 469, the system dust micromicro spy of oiling girdle oxygen society 1001) 30 weight portions, cresols phenolic resin varnish type epoxy resin (epoxide equivalent 215, the big system Ai Pikulong N-673 of Japanese ink chemical industry society) 40 weight portions, phenol novolac resin (the phenol hydroxyl equivalent 120 that contains triazine structure, big Japanese ink chemical industry society comes special KA-7052 in the system Fino) 30 weight portions and ethylene glycol ethyl ethers acid esters 20 weight portions, solvent naphtha 20 weight portions mix, the while heating for dissolving, to wherein adding terminal epoxidized polybutadiene rubber (Na Kaisai changes into industrial society and makes Na Lekusi R-45EPT) 15 weight portions and 2-phenyl-4, two (methylol) imidazoles of 5-are pulverized product 1.5 weight portions, broken silicon dioxide 2 weight portions of micro mist, silicon is defoamer 0.5 weight portion, the modulating epoxy resin composition.Use composition epoxy resin that the roll coater coating obtains so that after dried thickness becomes 50 μ m on the PET film of thickness 38 μ m, by 80～120 ℃ dry 10 minutes down, make the interlayer resin insulating layers resin film.

Then, describe with reference to Fig. 8～13 for the manufacture method of above-mentioned printing distributing board with reference to Figure 13.

(1) the deposited copper laminated plate 130A of the Copper Foil 132 of the two sides superimposed layer 18 μ m of the substrate 130 that will constitute at glass epoxy resin or BT (Bismaleimide Triazine) resin of thickness 0.8mm is as original material (with reference to Fig. 8 (A)).At first this copper-surfaced laminated plate 130A is holed, impose electroless plating and handle, become diagram shape, on the two sides of substrate 130, form lower floor's conductor circuit 134 and through hole 136 (with reference to Fig. 8 (B)) by etch.

(2) substrate 130 that will form through hole 136 and lower floor's conductor circuit 134 is washed, after the drying, will be contained NaOH (10g/l), NaClO ₂(40g/l), Na ₃PO ₄The aqueous solution (6g/l) makes melanism and bathes the melanism processing of (oxidation bath) and contain NaOH (10g/l), NaBH ₄The aqueous solution (6g/l) is as reducing bath, reduce processing, form roughened layer 134 α, 136 α (with reference to Fig. 8 (C)) on the full surface of the lower floor's conductor circuit 134 that contains through hole 136.In addition, as roughening treatment, the acicular alloy that also available soft etch or copper-nickel-phosphorus constitute is electroplated (weak former organic special trade name Integrata Bert that comes) and is formed or carry out roughening treatment with the method for the surface coarsening of the etching solution of the trade name " Mo Keaiqibangde " of Mo Ke society system etc.

(3) then, grind the surface of the contact-making surface 136a of the through hole 136 that will form roughened layer 136 α by polishing and grind, peel off roughened layer 136 α of contact-making surface 136a, flattening surface (with reference to Fig. 8 (D)).

(4) be modulated at the resin filling materials that above-mentioned B puts down in writing, be positioned on the substrate 130 with the interior mask 139 that opening is equivalent to its opening of part 139a of through hole 36 back 24 hours of modulation, after using scraper in through hole 136, to clamp-on resin filling materials 154, at 100 ℃ of down dry 20 minutes (with reference to Fig. 9 (A)).In the operation of above-mentioned (3), in through hole 136, form roughened layer 136 α after, grind, the surface of the contact-making surface 136a of smooth through hole 136.Thus, when resin filling materials being filled in the through hole 136, can prevent that resin filling materials 154 from flowing out along the roughened layer (anchor point) that forms on the contact-making surface 136a of through hole 136.Thus, can form the packing material 154 in the through hole smoothly, improve the reliability of the upper strata distribution of the through hole that in operation described later, forms.

And then, use scraper to form 154 layers of resin filling materials, at 100 ℃ of down dry 20 minutes (with reference to Fig. 9 (B)) in the non-formation of lower floor's conductor circuit 134 portion.As resin filling materials 154, preferably use any a kind that selects in the mixture of the mixture of mixture, epoxy resin and inorganic filler of epoxy resin and organic filler and epoxy resin and inorfil.Also can use the resin filling materials of the 1st embodiment.

(5) amary tape grinding machine of the belt grinding paper by using #600 (three physics and chemistry length of schooling) altogether, grind the single face of substrate 130 of the processing of above-mentioned (4), so that on the contact-making surface 136a surface of the surface of lower floor's conductor circuit 134 or through hole 136 not cull packing material 154 grind like that, then, polish grinding in order to remove the scar that causes owing to above-mentioned belt-sanding.Other faces for substrate 130 also carry out identical a series of like this grindings (with reference to Fig. 9 (C)).Then, carry out under 100 ℃ 1 hour, under 150 ℃, carry out 1 hour heat treatment, cured resin packing material 154.

Like this, remove the skin section that is filled in the resin filling materials 154 in lower floor's conductor circuit 134 or the through hole 136 and top alligatoring face 134 α of lower floor's conductor circuit 134, make the smoothing of substrate two sides.Thus, resin filling materials 154 and lower floor's conductor circuit 134 and through hole 136 can obtain firmly closely connected wiring substrate by roughened layer 134 α, 136 α.

(6) substrate 130 is washed, after the acid degreasing, carry out soft etch, then etching solution is blown on the two sides of substrate 130 with spraying, etch is carried out on the surface of lower floor's conductor circuit 134 and the contact-making surface surface 136a of through hole 136, on all surfaces of the surperficial 136a of the contact-making surface of through hole 136 and lower floor's conductor circuit 134, formed alligatoring face 134 β (with reference to Fig. 9 (D)).As etching solution, use the etching solution (Mo Keshe system, Mo Keaiqibangde) that constitutes by copper imidazolate (II) complex compound 10 weight portions, glycolic 7 weight portions, potassium chloride 5 weight portions.The roughened layer that forms is preferably in the scope of 0.1～5 μ m.As long as in this scope, conductor circuit and interlayer resin insulating layers just are difficult to peel off.

(7) will be positioned on the substrate 130 with resin film than the interlayer resin insulating layers of the big a little line of making of A of substrate 130, at pressure 4kgf/cm ², 80 ℃ of temperature, compress under the condition of 10 seconds time, compress severing temporarily after, and then use the vacuum lamination device to paste with following method and pay on the two sides of substrate 130, form interlayer resin insulating layers 150 (with reference to Figure 10 (A)).Promptly at vacuum degree 0.5Torr, pressure 4kgf/cm ², 80 ℃ of temperature, compress under the condition of 60 seconds time interlayer resin insulating layers formally compressed with resin film, then 170 ℃ of following hot curings 30 minutes.

(8) then, the mask 151 of the through hole 151a by having formed thickness 1.2mm on interlayer resin insulating layers 150 is with the CO of wavelength 10.4 μ m ₂Gas laser forms diameter 80 μ m on interlayer resin insulating layers 150 under the condition of the diameter 1.0mm of the through hole 151a of beam diameter 4.0mm, top-hat, pulse wide 8.0 μ seconds, mask 151,1 emission switching hole is with opening 152 (with reference to Figure 10 (B)).

(9) 10 minutes will have been formed in the switching hole is immersed in the permanganic acid that contains 60g/l with the substrate 130 of opening 152 80 ℃ the solution, the particle on the surface that is present in interlayer resin insulating layers 150 is removed in dissolving, forms alligatoring face 150 α (with reference to Figure 10 (C)) on the surface of the interlayer resin insulating layers 150 of the inwall of opening 152 containing the switching hole.Form the alligatoring face of this interlayer resin insulating layers in the scope of 0.5～5 μ m.As long as in this scope, just can guarantee closely connected property, can remove the conductor layer of back operation.

(10) then, wash after the substrate 130 of above-mentioned processing being immersed in the neutralization solution (west general come society's system).And then in asperities processing (the alligatoring degree of depth 3 μ m) the surface of this substrate 130 on pay palladium catalyst, on the surface of interlayer resin insulating layers 150 and the switching hole with attached catalyst nuclear on the internal face of opening 152.

(11) then, dipping substrate 130 in the electroless plating copper liquor of following composition, the electroless plating copper film 156 (with reference to Figure 10 (D)) of formation thickness 0.5～5.0 μ m on alligatoring face 150 α are all.

The electroless plating layer aqueous solution

NiSO ₄ 0.003mol/l

Tartaric acid 0.200mol/l

Copper sulphate 0.030mol/l

HCHO 0.050mol/l

NaOH 0.100mol/l

α, α '-bipyridine 40mg/l

Polyethylene glycol (PEG) 0.10g/l

Electroless plating layer condition

Under 35 ℃ liquid temp 40 minutes

(12) commercially available photosensitive dry film subsides are paid on electroless plating copper film 156, the mounting mask is with 100mJ/cm ²Exposure is handled with 0.8% aqueous sodium carbonate developing, and the resist plating 155 of thickness 30 μ m is set.Then, after 25 ℃ water washing, and then, under following condition, impose electrolytic copper plating, form the electrolytic copper plating film 157 (with reference to Figure 11 (A)) of thickness 20 μ m with after the sulfuric acid scrubbing with 50 ℃ water washing substrate 130, degreasing.

The metallide aqueous solution

Sulfuric acid 2.24mol/l

Copper sulphate 0.26mol/l

Additive 19.5ml/l

(Aunar gets section Japan society system, kappa draws the western HL of getting)

The metallide condition

Current density 1A/dm ²

65 minutes time

22 ± 2 ℃ of temperature

(13) with 5%NaOH peel off remove resist plating 155 after, handle electroless plating copper film 156 under its resist plating 155 with the mixed liquor etch of sulfuric acid and hydrogen peroxide, etch is removed after handling, and forms conductor circuit (comprising switching hole 146) 145 (with reference to Figure 11 (B)) of the thickness 18 μ m that are made of electroless plating copper film 156 and electrolytic copper plating film 157.

(14) carry out the processing identical,, on conductor circuit 145, form alligatoring face 145 α (with reference to Figure 11 (C)) by containing copper complex and organic acid etching solution with (6).

(15) repeat the operation of above-mentioned (7)～(14), and then form interlayer resin insulating layers 160 and conductor circuit 165 on the upper strata (comprising switching hole 166) (with reference to Figure 11 (D)).

(16) then, obtain anti-weld layer composition with the 1st embodiment same adjustment.

(17) then, after applying above-mentioned anti-weld layer composition with the thickness of 20 μ m on the two sides of substrate 130, carry out dried after, on anti-weld layer 170, use ultraviolet exposure with photomask is closely connected, carry out developing with DMTG and handle, form opening 171U, the 171D of 200 μ m diameters.Carry out heat treated then anti-weld layer 170 is solidified, formation has opening 171U, 171D, and its thickness is the anti-weld layer 170 (with reference to Figure 12 (A)) of 20 μ m.As above-mentioned anti-weld layer composition, can use commercially available anti-weld layer composition.

(18) then, after being immersed in the substrate 130 that forms anti-weld layer 170 in the electroless nickel plating solution identical with the 1st embodiment, be immersed in the electroless plating gold liquid, on

peristome

171U, 171D, form nickel coating 172 and Gold plated Layer 174 (with reference to Figure 12 (B)).

(19) then, printing contains the tinol of tin-lead on the opening 171U of the anti-weld layer 170 of substrate 130.And then in the peristome 171D of the opposing party's face printing as conductive adhesive 197 tinols.Then, 178 installations of conductivity connecting pin are supported in suitable pin supportive device, with the fixed part 198 and 197 bondings of the conductive adhesive in the peristome 171D of conductivity connecting pin 178.Carry out soft heat then, conductivity connecting pin 178 is fixed on the conductive adhesive 197.In addition as the installation method of conductivity connecting pin 178, conductive adhesive 197 can be joined in the peristome 171D that forms spherical grade or also can behind bonding conductive adhesive 197 on the fixed part 198, conductivity connecting pin 178 be installed, carry out soft heat then.Thus, can obtain having the printing distributing board 110 (with reference to Figure 13) of scolding tin salient point 176 and conductivity connecting pin 178.

The 1st variation of the 2nd embodiment

Below, the printing distributing board 120 of the 1st variation that relates to for the 2nd embodiment of the present invention describes with reference to Figure 19.For the 2nd above-mentioned embodiment, as shown in figure 13, use the PGA mode that connects by conductivity connecting pin 178 to be illustrated.For the 1st variation of the 2nd embodiment, roughly the same with the 2nd embodiment, but the salient point 176 usefulness BGA modes of daughter board side constitute.

Then, the manufacture method for the printing distributing board of the 1st variation of the 2nd embodiment describes with reference to Figure 14～Figure 19.

(1) the deposited copper laminated plate 130A of the Copper Foil 132 of the two sides lamination 18 μ m of the substrate 130 that will constitute at glass epoxy resin or BT (Bismaleimide Triazine) resin by thickness 1mm is as original material (with reference to Figure 14 (A)).At first this deposited copper laminated plate 130A is holed, after then forming the anti-plate layer, on this substrate 130, impose electroless plating copper and handle formation through hole 136, and then Copper Foil 132 etches are become figure according to well-established law, on the two sides of substrate 130, form conductor circuit 134 (with reference to Figure 14 (B)) of lower floor.

(2) substrate 130 that will form lower floor's conductor circuit 134 wash, after the drying, with injector etching solution is blown on the two sides of substrate 130, the surface of etch lower floor conductor circuit 134 and the inwall of through hole 136 and contact-making surface 136a surface form roughened layer 134 α, 136 α (with reference to Figure 14 (C)) on all surfaces of the lower floor's conductor circuit 134 that contains through hole 136.As etching solution, can use the mixture that has mixed copper imidazolate (II) complex compound 10 weight portions, glycolic 7 weight portions, potassium chloride 5 weight portions and ion exchange water 78 weight portions.In addition, as roughening treatment, the method that forms that also available formation is electroplated (weak former organic special trade name Integrata Bert that comes) by the acicular alloy that soft etch or melanism (oxidation)-reduction is handled or copper-nickel-phosphorus constitutes is carried out roughening treatment.

(3) then, grind the surface of the contact-making surface 136a of the through hole 136 that will form alligatoring face 136 α by polishing and grind, planarization (with reference to Figure 14 (D)) is carried out on the surface of contact-making surface 136a.

(4) then, will be equivalent to through hole 136 part 139a opening mask 139 be positioned on the substrate 130, uses printing machine to apply with the resin filling materials 154 (with reference to Figure 15 (A)) of epoxy resin resin as principal component.In the operation of above-mentioned (3), in through hole 136, form roughened layer 136 α after, grind, the surface of the contact-making surface 136a of smooth through hole 136.Thus, when resin filling materials being filled in the through hole 136, can prevent that resin filling materials 154 from flowing out along the roughened layer (anchor point) that forms on the contact-making surface 136a of through hole 136.Thus, can form the packing material 154 in the through hole smoothly, improve the reliability of the upper strata distribution of the through hole that in operation described later, forms.

Then, use printing machine on the two sides of substrate 130, to apply, carry out heat drying with the resin filling materials 154 of identical epoxy resin resin as principal component.That is, by this operation, at 134 potting resin packing materials 154 of lower floor's conductor circuit (with reference to Figure 15 (B)).As resin filling materials 154, preferably use any a kind that selects in the mixture of the mixture of mixture, epoxy resin and inorganic filler of epoxy resin and organic filler and epoxy resin and inorfil.Also can use the resin filling materials of the 1st embodiment.

(5) by using the amary tape grinding machine of belt grinding paper (three are total to the physics and chemistry length of schooling), grind the monolithic of substrate 130 of the processing of above-mentioned (4), so that on the contact-making surface 136a surface of the surface of lower floor's conductor circuit 134 or through hole 136 cull packing material 154 not, then, polish grinding in order to remove the scar that causes owing to above-mentioned belt-sanding.Other faces for substrate 130 also carry out identical a series of like this grindings.The resin filling materials 154 (with reference to Figure 15 (C)) that is heating and curing then and has filled.

(6) then, on the two sides of the substrate of finishing dealing with 130 of above-mentioned (5), spray the etching solution identical etching solution used with injector with above-mentioned (2), the etch planarization the surface of lower floor's conductor circuit 134 and the contact-making surface 136a surface of through hole 136, on all surfaces of lower floor's conductor circuit 134, form alligatoring face 134 α (with reference to Figure 15 (D)).

(7) then, on the two sides of the substrate 130 that passes through above-mentioned operation, being warmed up to 50～150 ℃ of temperature, at pressure 5kgf/cm ²With the thermohardening type cyclic olefine resin sheet vacuum compact laminate of thickness 50 μ m, the interlayer resin insulating layers 150 (with reference to Figure 16 (A)) that is made of the cyclic olefine resin is set down.Vacuum degree when vacuum compresses is 10mmHg.Also can use the resin film of embodiment.

(8) then, the mask 151 of the through hole 151a by having formed thickness 1.2mm on interlayer resin insulating layers 150 is with the CO of wavelength 10.4 μ m ₂Gas laser is provided with diameter 80 μ m on interlayer resin insulating layers 150 under the condition of beam diameter 5mm, top-hat, pulse wide 50 μ seconds, the aperture 0.5mm of mask, 3 emissions switching hole is with opening 152 (with reference to Figure 16 (B)).Then, use oxygen plasma to carry out purified treatment.

(9) then, use the SV-4540 of ULVAC Corp's system to carry out plasma treatment, the surface of alligatoring interlayer resin insulating layers 150 forms alligatoring face 150 α (with reference to Figure 16 (C)).At this moment, use argon gas, under the condition of 70 ℃ of electric power 200W, air pressure 0.6Pa, temperature, implement 2 minutes plasma treatment as inert gas.Also can form asperitiesization by acid or oxidant etc.

(10) then, use same apparatus, after the argon gas of inside is exchanged, under air pressure 0.6Pa, 80 ℃ of temperature, electric power 200W, the condition of 5 minutes time, carry out with Ni and Cu Ni/Cu metal level 148 being formed on the surface of interlayer resin insulating layers 150 as the sputter of target.At this moment, the thickness of the Ni/Cu metal level 148 of formation is 0.2 μ m (with reference to Figure 16 (D)).And then also can form the electrolytic copper free plated film and replace sputtering method.

(11) on the two sides of the substrate 130 that finishes above-mentioned processing, paste and pay commercially available photosensitive dry film, mounting photomask film is with 100mJ/cm ²After the exposure, handle, form the figure of the plated resist 155 of thickness 15 μ m with 0.8% sodium carbonate developing.Then, under following condition, carry out metallide, form the metallide film 157 (with reference to Figure 17 (A)) of thickness 15 μ m.In addition, the additive in the metallide aqueous solution is that the kappa of storehouse, Ah getting ground society system draws western HL.

The metallide aqueous solution

Sulfuric acid 2.24mol/l

Copper sulphate 0.26mol/l

Additive 19.5ml/l

The metallide condition

Current density 1A/dm ²

65 minutes time

22 ± 2 ℃ of temperature

(12) then, with 5%NaOH peel off remove plated resist 155 after, the Ni/Cu metal level 148 that its plated resist 155 exists is below removed in mixed liquor etch dissolving with nitric acid and sulfuric acid and hydrogen peroxide, forms the conductor circuit 145 (comprising switching hole 146) (with reference to Figure 17 (B)) of the thickness 16 μ m that are made of electrolytic copper plating film 157 grades.

(13) then, carry out the etch identical and handle, on conductor circuit 145, form alligatoring face 145 α (with reference to Figure 17 (C)) with (6).

(14) then, repeat the operation of above-mentioned (7)～(13), and then form interlayer resin insulating layers 160 and conductor circuit 165 on the upper strata (comprising switching hole 166) (with reference to Figure 17 (D)).

(15) then, obtain anti-weld layer composition (insulating organic resin material) with the 1st embodiment same adjustment.

(16) then, thickness with 20 μ m on the two sides of substrate 130 applies above-mentioned anti-weld layer composition, carry out dried after, on anti-weld layer 170, use ultraviolet exposure with photomask is closely connected, carry out developing with DMTG solution and handle, form the opening 171 of 200 μ m diameters.Carry out heat treated then anti-weld layer 170 is solidified, formation has opening 171, and its thickness is the anti-weld layer 170 (with reference to Figure 18 (A)) of 20 μ m.

(17) then, be immersed in the substrate 130 that forms anti-weld layer 170 in the electroless nickel plating solution after, on peristome 171, form the nickel coating 172 of thickness 5 μ m.And then its substrate 130 is immersed in the electroless plating liquid, on nickel coating 172, form the Gold plated Layer 174 of thickness 0.03 μ m.(with reference to Figure 18 (B)).

(18) then, printed solder paste on the opening 171 of anti-weld layer 170.Under 200 ℃, carry out soft heat, form scolding tin salient point 176, make printing distributing board 120 (with reference to Figure 19) with scolding tin salient point 176.

The 2nd variation of the 2nd embodiment

The printing distributing board that the 2nd variation relates to, with reference to Fig. 1～6, roughly the same with the 1st above-mentioned embodiment.But, for this 2nd variation, shown in Figure 20 (A), in switching hole 46 and through hole 36, after forming roughened layer (alloy that is made of Cu-Ni-P) 47 by electroless plating, the contact-making surface 36a of the through hole 36 that roughened layer 47 is formed polishes and grinds and carry out smoothing (Figure 20 (B)).Then, by mask potting resin filler 54, carry out drying (Figure 20 (C)) in through hole 36 and in the switching hole 46.Thus, can prevent that resin filler 54 from flowing out along roughened layer 47.

Comparative example 5

The printing distributing board of comparative example 5 is identical with the printing distributing board of the 2nd embodiment basically, but grind to form roughened layer through hole the contact-making surface surface and carry out planarization, potting resin packing material in through hole.Other conditions are identical.

Comparative example 6

The printing distributing board of comparative example 6 is identical with the printing distributing board of the 1st variation of the 2nd embodiment basically, but grinds the seam portion surface of the through hole that forms roughened layer and carry out planarization, potting resin packing material in through hole.Other conditions are identical.

Comparative example 7

The printing distributing board of comparative example 7 is identical with the printing distributing board of the 2nd variation of the 2nd embodiment basically, but grinds the contact-making surface surface of the through hole that forms roughened layer and carry out planarization, potting resin packing material in through hole.Other conditions are identical.

For the printing distributing board of the 2nd embodiment, the 1st variation, the 2nd variation and the printing distributing board of comparative example, flow out outside through hole for surface grinding, the resin filling materials of the contact-making surface of method of roughening, through hole 3, the result who compares as shown in figure 21.Show from result shown in Figure 20, printing distributing board for comparative example 5,6,7, owing to do not grind the contact-making surface surface of the through hole that forms roughened layer, when the potting resin packing material, resin filling materials flows out along the roughened layer of the contact-making surface that forms through hole.

Claims

1. multi-layer printed circuit board with the overlapping layers that forms on the both sides of core substrate, overlapping layers respectively have interlayer resin insulating layers and the conductor layer that alternately is equipped with, and this conductor layer is connected to each other by the switching hole, wherein:

Anti-flux layer is formed on the described multi-layer printed circuit board; With

The opening that connects external connection terminals is formed on the anti-flux layer.

2. the multi-layer printed circuit board of claim 1 wherein makes the layer of precious metal on intermediate layer and the intermediate layer be formed in the described opening.

3. the multi-layer printed circuit board of claim 2, wherein said intermediate layer is by the metal preparation that is selected from nickel, palladium, tin or titanium.

4. the multi-layer printed circuit board of claim 2, wherein said layer of precious metal is by constituting more than two layers.

5. so the multi-layer printed circuit board of claim 1 is wherein said outside link conductivity connecting pin or scolding tin salient point.

6. the multi-layer printed circuit board of claim 5, wherein said scolding tin salient point is by the metal preparation that is selected from Sn/Pb, Sn/Sb/Pb, Sn/Sb, Sn/Ag or Sn/Ag/Cu.

7. the multi-layer printed circuit board of claim 1 or claim 5, wherein said external connection terminals connects by the scolding tin that is selected from Sn/Pb, Sn/Sb/Pb, Sn/Sb, Sn/Ag or Sn/Ag/Cu.