Pali mbali imodzi, yapawiri komanso matabwa ozungulira osiyanasiyana .Chiwerengero cha matabwa amitundu yambiri sichimachepa.Pakali pano pali ma PCB opitilira 100 osanjikiza.The wamba Mipikisano wosanjikiza PCBs anayi wosanjikiza ndi matabwa asanu ndi limodzi .Ndiye n'chifukwa chiyani anthu ali ndi funso "N'chifukwa chiyani PCB multilayer matabwa onse zigawo ngakhale-nambala? Kunena zoona, ngakhale-nambala PCBs ali ndi PCBs kuposa owerengeka manambala, ndipo iwo ubwino zambiri.
1. Mtengo wotsika
Chifukwa cha kusowa kwa dielectric ndi zojambulazo, mtengo wa zipangizo zama PCB osawerengeka ndi wotsika pang'ono kuposa ma PCB owerengeka.Komabe, mtengo wopangira ma PCB osanjikizana ndiokwera kwambiri kuposa ma PCB osanjikiza.Mtengo wopangira gawo lamkati ndi wofanana, koma mawonekedwe a zojambulazo / pachimake mwachiwonekere amawonjezera mtengo wopangira gawo lakunja. PCB yosawerengeka ikufunika kuwonjezera njira yomangirira yosawerengeka ya laminated core pamaziko a dongosolo lachimake.Poyerekeza ndi kapangidwe ka zida za nyukiliya, kupanga bwino kwa mafakitale omwe amawonjezera zojambulazo kumachepa.Pamaso lamination ndi kugwirizana, pachimake akunja amafuna processing zina, amene kumawonjezera chiopsezo cha zokopa ndi etching zolakwika pa wosanjikiza akunja.
2. Kapangidwe kake kuti musapindike Chifukwa chabwino kwambiri chosapanga PCB yokhala ndi zigawo zosawerengeka ndikuti kuchuluka kwa ma board ozungulira kumakhala kosavuta kupindika.Pamene PCB itakhazikika pambuyo pa multilayer circuit bonding process, kusiyana kosiyana kwa lamination kwapakatikati ndi mapangidwe a zojambulazo kumapangitsa PCB kupindika ikazizira.Pamene makulidwe a bolodi lozungulira akuwonjezeka, chiopsezo chopindika cha PCB chokhala ndi zigawo ziwiri zosiyana chimawonjezeka.Chinsinsi chochotsa kupindika kwa board board ndikutengera stack yokhazikika.Ngakhale PCB yokhala ndi mulingo wina wopindika imakwaniritsa zofunikira, kuwongolera kotsatira kudzachepetsedwa, zomwe zimabweretsa kuwonjezeka kwa mtengo.Chifukwa zida zapadera ndi zaluso zimafunikira panthawi yosonkhanitsa, kulondola kwa kuyika kwa chigawo kumachepetsedwa, zomwe zidzawononga khalidwe.
Kunena mwanjira ina, ndizosavuta kumvetsetsa: Mu njira ya PCB, bolodi la magawo anayi limayendetsedwa bwino kuposa bolodi la magawo atatu, makamaka potengera ma symmetry.The warpage ya gulu la zigawo zinayi akhoza kulamulidwa pansipa 0,7% (IPC600 muyezo), koma Pamene kukula kwa gulu atatu wosanjikiza ndi lalikulu, warpage adzapitirira muyezo uwu, zomwe zidzakhudza kudalirika kwa chigamba SMT ndi mankhwala onse.Chifukwa chake, wopanga wamba sapanga gulu losanjikiza losawerengeka, ngakhale wosanjikiza wosawerengeka azindikira ntchitoyo, amapangidwa ngati wosanjikiza wabodza, ndiye kuti, zigawo 5 zidapangidwa ngati zigawo 6, ndi zigawo 7 adapangidwa ngati matabwa 8-wosanjikiza. Kutengera pazifukwa zomwe zili pamwambazi, ma board ambiri a PCB amapangidwa ndi zigawo zowerengeka komanso zigawo zochepa zosawerengeka.
Momwe mungakhazikitsire ma stacking ndikuchepetsa mtengo wa PCB yosawerengeka?
Nanga bwanji ngati PCB yosadziwika bwino ikuwoneka pamapangidwe?
Njira zotsatirazi zingathe kukwaniritsa stacking moyenera, kuchepetsa Kupanga kwa PCB mtengo, ndikupewa kupindika kwa PCB.
1) Chingwe cha chizindikiro ndikuchigwiritsa ntchito.Njirayi ingagwiritsidwe ntchito ngati gawo lamphamvu la mapangidwe a PCB ndilofanana ndipo chizindikiro cha chizindikiro ndi chosamvetseka.Wowonjezera wosanjikiza samawonjezera mtengo, koma amatha kufupikitsa nthawi yobereka ndikuwongolera mtundu wa PCB. 2) Onjezani mphamvu yowonjezera yowonjezera.Njirayi ingagwiritsidwe ntchito ngati gawo la mphamvu la mapangidwe a PCB ndi losamvetseka ndipo chizindikiro cha chizindikiro chimakhala chofanana.Njira yosavuta ndiyo kuwonjezera wosanjikiza pakati pa stack popanda kusintha zina.Choyamba, tsatirani masanjidwe osamvetseka a PCB, ndiyeno koperani wosanjikiza pansi pakati kuti mulembe zigawo zotsalazo.Izi ndizofanana ndi mawonekedwe amagetsi amtundu wokhuthala wa zojambulazo. 3) Onjezani wosanjikiza wopanda kanthu pafupi ndi pakati pa PCB stack.Njirayi imachepetsa kusalinganika kwa ma stacking ndikuwongolera mtundu wa PCB.Choyamba, tsatirani zigawo zosawerengeka kuti muyende, kenaka yikani chizindikiro chopanda kanthu, ndikulemba zigawo zotsalazo.Amagwiritsidwa ntchito m'mabwalo a microwave ndi makina osakanikirana (ma dielectric constants osiyanasiyana). 
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