Kodi muyenera kusankha motani PCB zakuthupi

Zipangizo zomwe zimagwiritsidwa ntchito popanga ma board board (PCBS) zimaphatikizira gulu lazotetezera / ma dielectric ndi zida zopangira zomwe zimagwiritsidwa ntchito popanga ma bolodi oyang’anira dera. Zipangizo zosiyanasiyana zimapezeka kuti zikwaniritse magwiridwe antchito ndi bajeti. Mtundu wazinthu zomwe zimagwiritsidwa ntchito popanga PCBS ndichinthu chofunikira pakulimba komanso magwiridwe antchito azigawo za PCB. Kusankha zinthu zoyenera za PCB kumafuna kumvetsetsa zinthu zomwe zilipo ndi mawonekedwe ake, komanso momwe zimayendera limodzi ndi zomwe gulu likufuna.

Mtundu wa bolodi losindikizidwa

Pali mitundu 4 yayikulu ya PCBS:

L Okhwima – olimba, osapunduka osakwatira – kapena PCB iwiri

Flexible (Flex) – imagwiritsidwa ntchito nthawi zambiri pamene PCB siyingokhala mundege imodzi kapena m’malo osakhala pandege

L Okhwima-osinthika – ndi kuphatikiza kwa PCB yolimba komanso yosinthasintha, komwe bolodi losunthika limalumikizidwa ndi bolodi yolimba

L Kuthamanga kwapamwamba – Ma PCBS awa amagwiritsidwa ntchito muntchito zomwe zimafunikira mayendedwe apadera pakati pa chandamale ndi wolandila.

Zinthu zakuthupi za PCB zimafunika kuti zikwaniritse magwiridwe antchito omaliza osindikizidwa a board board. Chifukwa chake, ndikofunikira kulingalira momwe magwiridwe antchito ndi chilengedwe zimafunira.

Katundu wofunika kuganiziridwa posankha zida za PCB

Makhalidwe anayi Akuluakulu (ochokera ku IPC 4101 – Okhwima ndi Multilayer PCB Base Zida Zazinthu) Mtundu wazinthu za PCB ndizofunikira kwambiri kuti zithandizire kufotokoza magwiridwe antchito.

1. Izi ndizofunikira kwambiri pa Z-axis. Mwambiri, kukulira ndikokulirapo kuposa kutentha kwa kuwonongeka (Tg). Ngati CTE yazinthuzo siyokwanira kapena yokwera kwambiri, kulephera kumatha kuchitika pamsonkhanowu chifukwa zinthuzo zidzakula mofulumira pa Tg.

2. Tg – Kutentha kwa kusintha kwa vitrification kwakuthupi ndikutentha komwe zinthuzo zimasintha kuchoka pachinthu chokhala ndi magalasi osasunthika kupita pachinthu chokhala ngati mphira. Kutentha kwambiri kuposa zida za Tg, kuchuluka kwakukula kumawonjezeka. Kumbukirani kuti zida zitha kukhala ndi Tg zomwezo koma zimakhala ndi CTE zosiyanasiyana. (CTE yapansi ndiyofunika).

3.Td – kutentha kwa kuwonongeka kwa ma laminates. Kutentha kumene kumawonongeka. Kudalirika kumakhala kovuta ndipo delamination itha kuchitika pomwe zinthuzo zimatulutsa mpaka 5% ya kulemera kwake koyambirira. PCB yodalirika kwambiri kapena PCB yogwira ntchito pamavuto adzafunika TD yoposa kapena yofanana ndi 340 ° C.

4. Nthawi ya Delamination pa T260 / T288 – 260 ° C ndi 280 ° C – Kuphatikizana kwa ma laminates chifukwa cha kuwonongeka kwa matenthedwe (Td) a epoxy resin matrix pomwe makulidwe a PCB asinthidwa mosasinthika.

Kuti musankhe zinthu zabwino kwambiri zopangira laminate pa PCB yanu, ndikofunikira kudziwa momwe mumayembekezera kuti zinthuzo zizikhala bwino. Chimodzi mwazinthu zosankhira zakuthupi ndikulumikiza matenthedwe azinthu zopaka laminated kwambiri ndi zinthu zomwe zimayenera kuwotcheredwa ndi mbale.