Kukho iindawo ezininzi kwiUyilo lwePCBapho kufuneka kuthathelwe ingqalelo izithuba ezikhuselekileyo.Apha, ihlelwa okwethutyana yaziindidi ezimbini: enye yeyombane enxulumene nezithuba zokhuseleko, enye ingeyombane enxulumene nezithuba zokhuseleko.
Izithuba zokhuseleko ezinxulumene nombane
1.Isithuba phakathi kweengcingo
Ngokubhekiselele kumthamo wokusetyenzwa kwesiqheloAbavelisi bePCBisithuba phakathi kweengcingo aziyi kuba ngaphantsi kwe-4mil.Umgama omncinci wocingo ukwangumgama ukusuka kwingcingo ukuya kwingcingo kunye nocingo ukuya kwipad.Ukusuka kwimbono yemveliso, inkulu ngcono ukuba kunokwenzeka, kwaye i-10mil yinto eqhelekileyo.
2.Ipad yokuvula kunye nobubanzi bepad
Ngokumalunga nomthamo wokusetyenzwa kwabavelisi be-PCB abaqhelekileyo, ukuvuleka kwepadi akufuneki kube ngaphantsi kwe-0.2mm ukuba yombiwa ngoomatshini, kunye ne-4mil ukuba yombiwa ngelaser.Ukunyamezela kwe-aperture kuhluke kancinci ngokweplate, ngokubanzi kunokulawulwa ngaphakathi kwe-0.05mm, ububanzi obuncinane bepadi akufanele bube ngaphantsi kwe-0.2mm.
3.Isithuba phakathi kwephedi
Ngokubhekiselele kumthamo wokusetyenzwa kwabavelisi be-PCB abaqhelekileyo, isithuba phakathi kweepads asiyi kuba ngaphantsi kwe-0.2mm.
4. Umgama phakathi kobhedu kunye nomphetho wepleyiti
Isithuba phakathi kwesikhumba sobhedu esihlawuliweyo kunye nomphetho weibhodi PCBkufuneka ingabi ngaphantsi kwe-0.3mm.Kwibhodi yoyilo-yeMithetho-yephepha lolwandlalo, seta umgaqo wesithuba sale nto.
Ukuba indawo enkulu yobhedu ibekwe, ngokuqhelekileyo kukho umgama wokucutha phakathi kwepleyiti kunye nomphetho, obekwe ngokubanzi kwi-20mil.Kuyilo lwePCB kunye neshishini lokuvelisa, phantsi kweemeko eziqhelekileyo, ngenxa yoqwalaselo lomatshini lwebhodi yesekethe egqityiweyo, okanye ukunqanda ulusu lobhedu oluveziweyo kumda webhodi lunokubangela ukuqengqeleka komphetho okanye umbane omfutshane, iinjineli ziya kuhlala zisasaza a indawo enkulu yobhedu block ngokubhekiselele emphethweni webhodi shrinkage 20mil, kunokuba ulusu ubhedu iye yasasazwa emphethweni webhodi.
Oku kufakwa kobhedu kunokusingathwa ngeendlela ezahlukeneyo, njengokuzoba umaleko wokugcina ecaleni komda weplate, uze ubeke umgama phakathi kobhedu kunye nokugcina.Indlela elula yaziswa apha, oko kukuthi, imigama eyahlukeneyo yokhuseleko imiselwe izinto zokubeka ubhedu.Ngokomzekelo, umgama wokhuseleko webhodi yonke ibekwe kwi-10mil, kwaye ukubeka ubhedu kubekwe kwi-20mil, enokuthi iphumelele umphumo wokunciphisa i-20mil ngaphakathi komda webhodi kwaye isuse ubhedu olunokuthi lufile kwisixhobo.
Izithuba zokhuseleko ezingezizo ezombane
1. Ububanzi bomlinganiswa, ubude kunye nesithuba
Akukho lutshintsho lunokwenziwa ekuqhutyweni kwefilimu yombhalo, kodwa ububanzi bemigca yabalinganiswa abangaphantsi kwe-0.22mm (8.66mil) kwi-D-CODE kufuneka ibhalwe ngqindilili ukuya kwi-0.22mm, oko kukuthi, ububanzi bemigca ye iimpawu L = 0.22mm (8.66mil).
Ububanzi bomlingiswa wonke ngu-W = 1.0mm, ukuphakama komlingiswa wonke ngu-H = 1.2mm, kwaye isithuba phakathi kweempawu ngu-D = 0.2mm.Xa okubhaliweyo kungaphantsi komgangatho ongentla, ukusetyenzwa koshicilelo kuya kuba mfiliba.
2.Isithuba phakathi kwe-Vias
Umngxuma wokuphumela (VIA) ukuya kumngxuma wokuphumela ngaphandle (umphetho ukuya kumphetho) kufuneka ube mkhulu kune-8mil.
3.Umgama ukusuka kushicilelo lwesikrini ukuya kwiphedi
Ukuprintwa kwesikrini akuvumelekanga ukugubungela iphedi.Kuba ukuba ushicilelo lwesikrini lugqunyelelwe ngephedi ye-solder, ushicilelo lwesikrini aluyi kuba setotini xa itoti ivuliwe, nto leyo eya kuchaphazela ukunyuswa kwecandelo.Umzi-mveliso webhodi ngokubanzi ufuna ukuba isithuba esisi-8mil sibekelwe ngokunjalo.Ukuba ibhodi ye-PCB ilinganiselwe kwindawo, izithuba ezi-4mil zamkelekile.Ukuba ushicilelo lwesikrini lugqunywe ngempazamo kwiphedi ngexesha loyilo, umzi-mveliso wepleyiti uya kuphelisa ngokuzenzekelayo ukuprintwa kwesikrini kwipadi ngexesha lokuvelisa ukuqinisekisa i-tin kwi-pad.
Ewe kunjalo, yimeko-nge-case indlela ngexesha loyilo.Ngamanye amaxesha ukuprintwa kwesikrini kugcinwe ngamabomu kufutshane nephedi, kuba xa iipads ezimbini zisondelelene, ukuprintwa kwesikrini phakathi kunokuthintela ngokufanelekileyo uxhulumaniso lwe-solder isiphaluka esifutshane ngexesha le-welding, enye imeko.
4.Mechanical ubude be-3D kunye nezithuba ezithe tye
Xa ufaka amacandelo kwiPCB, kuyimfuneko ukuqwalasela ukuba ngaba ulwalathiso oluthe tye kunye nokuphakama kwendawo kuya kungqubuzana nezinye izakhiwo zomatshini.Ngoko ke, kuyilo, kufuneka siqwalasele ngokupheleleyo ukuhambelana phakathi kwamacandelo, phakathi kweemveliso ezigqityiweyo zePCB kunye neqokobhe lemveliso, kunye nesakhiwo sesithuba, kwaye sigcine isithuba esikhuselekileyo sento nganye ekujoliswe kuyo ukuqinisekisa ukuba akukho ngquzulwano esithubeni.
