NgeNkqubo kwiMultilayer PCB Fabrication

IVias yenye yezinto ezibalulekileyoUkwenziwa kwePCB ezininzi, kunye neendleko zokomba ngokuqhelekileyo zibalelwa kwi-30% ukuya kwi-40% yeendleko zeIprototype yePCB.Umngxuma odlulayo ngumngxuma owembiweyo kwilaminate yobhedu.Ithwala ukuqhutyelwa phakathi kweengqimba kwaye isetyenziselwa ukudibanisa kombane kunye nokulungiswa kwezixhobo.umsesane.

Ukusuka kwinkqubo yokwenziwa kwe-PCB eninzi, i-vias yahlulwe yangamacandelo amathathu, angala, imingxuma, imingxuma engcwatyiweyo nangemingxuma.Kwi-multilayer PCB eyenziwe kunye nemveliso, eziqhelekileyo ngeenkqubo ziquka nge-oyile ye-cover, nge-oyile yeplagi, ngokuvula ifestile, i-resin plug hole, i-electroplating hole filling, njl. Inkqubo nganye ineempawu zayo.

1. Ngeoli yokugubungela

“Ioyile” ye-oyile yokugquma ibhekisa kwi-oyile ye-solder yemaski, kwaye i-oyile yokugquma ngomngxuma kukugquma umngxuma we-oyile nge-inki ye-solder.Injongo ye-oyile yokugubungela i-insulate, ngoko ke kuyimfuneko ukuqinisekisa ukuba isigqubuthelo se-inki somngxunya sigcwele kwaye sityebile ngokwaneleyo, ukwenzela ukuba i-tin ayiyi kubambelela kwi-patch kunye ne-DIP kamva.Kufuneka kuqatshelwe apha ukuba ifayile yi-PADS okanye iProtel, xa ithunyelwa kumzi-mveliso wokwenziwa kwe-PCB eninzi nge-oyile yokugquma, kufuneka ukhangele ngononophelo ukuba iplagi-in emngxunyeni (PAD) isebenzisa, kwaye ukuba, iplagi-in umngxuma iya kugqunywa ngeoli eluhlaza kwaye ayikwazi i-welded.

2. Ngefestile

Kukho enye indlela yokujongana “neoyile yokugquma” xa kuvulwe umngxuma.Umngxuma odlulayo kunye negrommet akufuneki igqunywe ngeoyile yemaski yesolder.Ukuvulwa komngxuma odlulayo kuya kwandisa indawo yokulahla ubushushu, nto leyo enceda ukutshabalalisa ubushushu.Ngoko ke, ukuba iimfuno zokutshatyalaliswa kobushushu zebhodi ziphezulu, ukuvulwa komngxuma kunokukhethwa.Ukongeza, ukuba ufuna ukusebenzisa i-multimeter ukwenza umsebenzi othile wokulinganisa kwi-vias ngexesha lokwenziwa kwe-PCB eninzi, yenza i-vias ivuleke.Nangona kunjalo, kukho umngcipheko wokuvula umngxuma - kulula ukubangela ukuba i-pad ibe mfutshane kwi-tin.

3. Nge-oyile yeplagi

Nge-oyile yokuplaga, oko kukuthi, xa i-PCB ye-multilayer isenziwa kwaye iveliswa, i-inki yemaski ye-solder iplagwa kuqala kumngxunya ngephepha le-aluminium, emva koko i-oyile yemaski ye-solder iprintwa kwibhodi yonke, kwaye yonke imingxunya. ayiyi kuhambisa ukukhanya.Injongo kukuthintela vias ukuthintela amaso inkonkxa ekuzifihleni emingxunyeni, kuba amaso inkonkxa uya kumpompoza ukuya pads xa zinyibilika kwiqondo lobushushu eliphezulu, ebangela iisekethe ezimfutshane, ingakumbi BGA.Ukuba i-vias ayinayo i-inki efanelekileyo, imiphetho yemingxuma iya kujika ibe bomvu, kubangele ukuba "i-false copper exposure" imbi.Ukongeza, ukuba ioyile yokuplaga nge hole ayenziwanga kakuhle, iyakuchaphazela nenkangeleko.

4. Umngxuma weplagi yeresin

Umngxuma weplagi we-resin uthetha nje ukuba emva kokuba udonga lomngxuma lufakwe ngobhedu, umngxuma odlulayo ugcwaliswe nge-epoxy resin, emva koko ubhedu lubekwe phezu komhlaba.Isiseko somngxuma weplagi ye-resin kukuba kufuneka kubekho i-copper plating emngxunyeni.Oku kungenxa yokuba ukusetyenziswa resin iplagi imingxunya kwi PCBs isoloko isetyenziselwa iindawo BGA.I-BGA yesiNtu inokusebenzisa nge-PAD kunye ne-PAD ukuhambisa iingcingo ngasemva.Nangona kunjalo, ukuba i-BGA ixinene kakhulu kwaye i-Via ayikwazi ukuphuma, inokugrunjwa ngokuthe ngqo kwi-PAD.Yenza Via komnye umgangatho ukuya kwiintambo zendlela.Umphezulu wokwenziwa kwe-PCB ye-multilayer yinkqubo yeplagi ye-resin ayinazibonda, kwaye imingxuma ingavulwa ngaphandle kokuchaphazela i-soldering.Ke ngoko, ithandwa kwezinye iimveliso ezinomaleko aphezulu kunyeiibhodi ezityebileyo.

5. I-Electroplating kunye nokuzaliswa komngxuma

Ukuzaliswa kwe-Electroplating kunye nokuzaliswa kuthetha ukuba i-vias izaliswe ngobhedu oluxutywe nge-electroplated ngexesha lokwenziwa kwe-PCB ye-multilayer, kwaye umzantsi womngxuma usicaba, ongenzi nje kuphela ukuyila imingxuma egciniweyo kwayenge pads, kodwa inceda ekuphuculeni ukusebenza kombane, ukutshatyalaliswa kobushushu, kunye nokuthembeka.