Siza kudibana nemiba eyahlukeneyo yezithuba zokhuseleko kuyilo lwePCB oluqhelekileyo, olufana nesithuba phakathi kwe-vias kunye neepads, kunye nesithuba phakathi kwemizila kunye nemizila, zizinto zonke ekufuneka siziqwalasele.
Sahlulahlula ezi zikhewu zibe ziindidi ezimbini:
Ukukhutshwa kokhuseleko lombane
Ucoceko lokhuseleko olungelulo umbane
1. Umgama wokhuseleko lombane
1. Izithuba phakathi kweengcingo
Esi sithuba sidinga ukuqwalasela umthamo wemveliso yomvelisi wePCB.Kucetyiswa ukuba isithuba phakathi kwemikhondo singabi ngaphantsi kwe-4mil.Esona sithuba sincinci somgca sikwangumgca ukuya kumgca kunye nesithuba somgca ukuya kwiphedi.Ngoko ke, ngokombono wemveliso yethu, ngokuqinisekileyo, inkulu ngcono ukuba kunokwenzeka.Ngokubanzi, i-10mil eqhelekileyo ixhaphake kakhulu.
2. Indawo yokuvula iphedi kunye nobubanzi beepadi
Ngokomenzi we-PCB, ukuba i-pad aperture yenziwe ngoomatshini, ubuncinci akufanele bube ngaphantsi kwe-0.2mm.Ukuba i-laser drilling isetyenzisiwe, kucetyiswa ukuba ubuncinci bungekho ngaphantsi kwe-4mil.Ukunyamezela kwe-aperture kuhluke kancinane ngokuxhomekeke kwipleyiti, ngokubanzi kunokulawulwa ngaphakathi kwe-0.05mm, kwaye ububanzi bepadi obuncinane abufanele bube ngaphantsi kwe-0.2mm.
3. Isithuba phakathi kwephedi kunye nephedi
Ngokwekhono lokucubungula lomenzi we-PCB, kucetyiswa ukuba umgama phakathi kwe-pad kunye ne-pad ungekho ngaphantsi kwe-0.2mm.
4. Umgama phakathi kwesikhumba sobhedu kunye nomda webhodi
Umgama phakathi kwesikhumba sobhedu esihlawuliweyo kunye nomphetho webhodi ye-PCB kukhethwa ukuba ungabi ngaphantsi kwe-0.3mm.Ukuba yindawo enkulu yobhedu, ihlala ifuna ukurhoxiswa ukusuka kumda webhodi, ngokuqhelekileyo isetelwe kwi-20mil.
Kwiimeko eziqhelekileyo, ngenxa yokuqwalaselwa komatshini webhodi yesekethe egqityiweyo, okanye ukuphepha ukugoba okanye iibhulukhwe zombane ezibangelwa lubhedu oluveziweyo elunxwemeni lwebhodi, iinjineli zihlala zicutha iibhloko zobhedu kwindawo enkulu nge-20 mils ngokubhekiselele kumda webhodi. .Ulusu lobhedu alusoloko lusasazeka kumda webhodi.Kukho iindlela ezininzi zokujongana nolu hlobo lokuncipha kobhedu.Umzekelo, zoba umaleko wokugcina kumda webhodi, uze usete umgama phakathi kwepaving yethusi kunye nokugcina.
2. Umgama wokhuseleko ongekho ngombane
1. Ububanzi bomlinganiswa kunye nobude kunye nesithuba
Ngokuphathelele abalinganiswa besikrini sesilika, sisebenzisa amaxabiso aqhelekileyo anje nge5/30 6/36 mil njalo njalo.Kuba xa okubhaliweyo kukuncinci kakhulu, ushicilelo olusetyenziweyo luya kuba lufiphalo.
2. Umgama ukusuka kwisikrini sesilika ukuya kwiphedi
Isikrini sesilika asivumelekanga ukuba sibeke kwi-pad, kuba ukuba isikrini se-silk sihlanganiswe ne-pad, isikrini se-silika asiyi kufakwa kwi-tinning ngexesha le-tinning, eya kuchaphazela ukufakwa kwecandelo.
Ngokubanzi, umzi-mveliso webhodi ufuna indawo ye-8mil ukuba igcinwe.Ukuba kungenxa yokuba ezinye iibhodi zePCB ziqinile ngokwenene, asinakuyamkela i-4mil pitch.Emva koko, ukuba isikrini sesilika sigqume ngempazamo ipad ngexesha loyilo, umzi-mveliso webhodi uya kuyisusa ngokuzenzekelayo indawo yesikrini sesilika eshiywe kwipadi ngexesha lokwenziwa kokwenziwa ukuze kuqinisekiswe ukuba iphedi ifakwe etotini.Ngoko kufuneka sinikele ingqalelo.
3. Ubude be-3D kunye nezithuba ezithe tye kwisakhiwo somatshini
Xa unyusela amacandelo kwi-PCB, qwalasela ukuba kuya kubakho iingxabano kunye nezinye izakhiwo zoomatshini kwicala elithe tye kunye nokuphakama kwendawo.Ngoko ke, kuyilo, kuyimfuneko ukuqwalasela ngokupheleleyo ukulungelelaniswa kwesakhiwo sendawo phakathi kwamacandelo, naphakathi kwe-PCB egqityiweyo kunye neqokobhe lemveliso, kwaye ugcine umgama okhuselekileyo wento nganye ekujoliswe kuyo.