F4(Cov Khoom Siv Fiberglass Board) raws li cov ntaub ntawv tso cai tswj hwm muaj cov khoom lag luam hauv qab no:
Kev ua haujlwm siab siab yog qhov nruab nrab: nws yuav ua tau tsis zoo rau lub teeb meem hluav taws xob siab, uas tuaj yeem cuam tshuam rau cov cim ruaj khov ntawm cov kev ntsuas kub siab.
Tus nqi siab: Kev ua nyuaj yog qhov siab, tus nqi yog qhov siab, thiab nws tsis haum rau cov neeg siv nrog nyiaj txiag tsawg.
High brittleness: cov khoom yog nkig thiab yooj yim puas, xav tau ceev faj saib.
Cov teeb meem no yuav tsum tau ntsuas tiv thaiv cov xwm txheej kev siv tshwj xeeb tshaj plaws.
Dab tsi yog qhov zoo thiab tsis zoo ntawm fr4 substrate?
FR4 Substrate yog ib hom luam tawm hluav taws xob cov khoom siv (PCB), tsuas yog tsim ntawm epoxy cob qhia thiab cov khoom siv hluav taws xob zoo, nrog cov khoom siv hluav taws xob zoo. Cov hauv qab no yog qhov zoo thiab tsis zoo ntawm Fr4 substrate:
Hom tau zoo:
1. Kev ua tau hluav taws xob zoo: FR4 substrate muaj cov rwb rwb rwb rwb thaiv tsev thiab cov khoom siv qis, haum rau cov kev thov loj thiab hluav taws xob siab.
2. Cov khoom siv zoo muaj zog: Vim tias lub zog ntawm cov iav fiber ntau, fr4 substrate muaj siab ua kom muaj zog, thiab tuaj yeem tiv thaiv cov kev ntxhov siab ntau dua.
3. Noo noo thiab tshuaj lom neeg tiv taus: FR4 cov khoom muaj txiaj ntsig zoo rau noo noo thiab tej yam tshuaj tsis muaj zog, tso cai kom muaj kev ruaj khov ua tau zoo txawm tias muaj kev nyab xeeb ib puag ncig.
4. Cov txheej txheem zoo: FR4 substrates tuaj yeem ua tiav tiav los ntawm ntau txoj kev sib txuam xws li drilling, txiav, thiab ua rau nws haum rau kev tsim khoom loj.
5. Tus nqi nruab nrab: piv rau lwm qhov kev ua tau zoo substrates, FR4 substrates muaj tus nqi qis thiab haum rau tsim cov khoom lag luam hluav taws xob.
Qhov tsis zoo:
1. Cov neeg txom nyem thermal conductivity: FR4 muaj kev txom nyem thermal condal, uas yuav ua rau muaj kev ntseeg siab hauv zos thiab cuam tshuam kev ntseeg tau ntev ntawm Circuit Court.
2. Dielectric tas li sib txawv nrog zaus: Hauv kev siv cov ntawv thov siab, tus ditrate constant ntawm fr4 substrate yuav sib txawv nrog zaus, ua rau teeb liab distortion.
3. Ya dej noo kev nqus: txawm hais tias FR4 muaj qee qhov kev ua haujlwm noo noo, nws tseem tuaj yeem nqus dej noo thiab cuam tshuam cov hluav taws xob noo noo.
4. Qhov kev txwv ib puag ncig: Qhov ntsuas kub rau kev siv FR4 yog tsawg, thiab tshaj qhov qee qhov kub thiab txias yuav ua rau muaj kev ua haujlwm tsawg dua.