8 Layer ENIG FR4 Multilayer PCB

1. Wahala na tsaka-tsakin tsaka-tsaki

Saboda da yawa yadudduka na multilayer PCB kwamitin, da calibration da ake bukata na PCB Layer ne mafi girma da kuma mafi girma.Yawanci, haƙurin jeri tsakanin yadudduka ana sarrafa shi a 75um.Yana da wuya a sarrafa jeri na multilayer PCB kwamitin saboda girman girman naúrar, yawan zafin jiki da zafi a cikin tarurrukan jujjuya hoto, rarrabuwar kawuna wanda ya haifar da rashin daidaituwa na allunan mahimmanci daban-daban, da yanayin sanyawa tsakanin yadudduka. .

2. Wahalar samar da kewayen ciki

Kwamitin PCB multilayer yana ɗaukar abubuwa na musamman irin su TG mai girma, babban sauri, babban mita, jan ƙarfe mai nauyi, ƙaramin dielectric na bakin ciki da sauransu, wanda ke gabatar da manyan buƙatu don samarwa na ciki da sarrafa girman hoto.Misali, amincin watsa siginar impedance yana ƙara wahalar ƙirƙira kewayen ciki.Faɗin nisa da tazarar layi ƙanana ne, buɗaɗɗen kewayawa da gajeriyar kewayawa yana ƙaruwa, ƙimar wucewa ta ƙasa;tare da mafi siraran siginar siginar layi, yuwuwar gano zubewar AOI na ciki yana ƙaruwa.Farantin ciki na ciki yana da bakin ciki, mai sauƙin murƙushewa, rashin ɗaukar hoto, mai sauƙi don curl etching;Multilayer PCB shine mafi yawan tsarin allo, wanda ke da girman naúrar girma da tsadar tarkace.

3. Matsaloli a cikin lamination da kuma dacewa masana'antu

Yawancin allunan ainihin ciki da allunan da aka warkar da su an ɗora su, waɗanda ke da lahani ga lahani kamar farantin faifai, lamination, resin void da ragowar kumfa a cikin samarwa.A cikin zane na laminated tsarin, da zafi juriya, matsa lamba juriya, manne abun ciki da dielectric kauri daga cikin kayan ya kamata a cikakken la'akari, da kuma m kayan latsa makirci na multilayer farantin ya kamata a yi.Saboda babban adadin yadudduka, haɓakawa da sarrafawar haɓakawa da ƙimar ƙima ba daidai ba ne, kuma ƙaramin insulating Layer na bakin ciki yana da sauƙi don haifar da gazawar gwajin aminci tsakanin Layer Layer.

4. Matsalolin samar da hakowa

Yin amfani da babban TG, babban gudu, babban mita, kauri na musamman farantin karfe yana ƙara ƙaƙƙarfan hakowa, busa hakowa da wahalar cire tabo.Yawancin yadudduka, kayan aikin hakowa suna da sauƙin karya;CAF gazawar lalacewa ta hanyar m BGA da kunkuntar bango tazara ne mai sauki kai ga m hakowa matsala saboda PCB kauri.