PCB yog ib qho cuab yeej uas luam tawm cov khoom siv hluav taws xob, cov khoom siv, thiab cov khoom siv hluav taws xob mus rau hauv cov txheej txheem insulating. Copper foil yog ib qho tseem ceeb hauv PCB, ua si lub luag haujlwm tseem ceeb ntawm cov txheej txheem conductive. Tshwj xeeb, cov txheej txheem tooj liab feem ntau hauv PCBs suav nrog:
1. Ib sab tooj liab ntawv nyiaj PCB: Raws li lub npe qhia, nws tsuas muaj ib sab coated nrog ib txheej ntawm tooj liab ntawv nyiaj thiab lwm sab yog ib tug liab qab substrate. Hom PCB no tsis yog tsuas yog tus nqi tsim khoom xwb, tab sis kuj yooj yim rau txheej txheem thiab kho, ua rau nws siv dav hauv ntau yam khoom siv hluav taws xob yooj yim.
2. Ob chav sided tooj liab ntawv nyiaj PCB: Piv nrog ib leeg-sided copper foil PCB, ob-sided copper foil PCB yog coated nrog ob txheej ntawm tooj liab ntawv ci, nyob rau sab saum toj thiab hauv qab feem. Qhov no ua rau cov qauv tsim hluav taws xob ntau dua, tab sis kuj ua rau muaj kev nyuaj rau kev ua thiab kev saib xyuas.
3. Multilayer copper foil PCB: Nrog rau qhov nyuaj ntawm cov khoom siv hluav taws xob, qhov nyuaj ntawm PCB tsim kuj tseem nce ntxiv, yog li xav tau ntau txheej ntawm cov ntawv ci tooj liab kom ua tiav ntau lub voj voog. Multilayer PCBs tuaj yeem ncav cuagplaub, rau, los yogkaumlos yog ntau txheej.
Yog li dab tsi yog cov haujlwm tshwj xeeb ntawm cov ntawv ci tooj liab hauv PCB? Feem ntau muaj cov nram qab no yam:
1. Conductivity: Copper foil, raws li cov khoom siv hlau, muaj cov khoom siv hluav taws xob siab thiab yog li siv los ua cov txheej txheem conductive hauv PCB circuits. Los ntawm kev siv tooj liab foils ntawm ntau qib sib txawv, cov qauv tsim hauv Circuit Court complex tuaj yeem ua tiav kom tau raws li qhov xav tau ntawm ntau yam khoom siv hluav taws xob.
2. Corrosion resistance: Copper foil plays lwm lub luag haujlwm tseem ceeb hauv PCB, uas yog los tiv thaiv PCB los ntawm eroded thiab corroded los ntawm ib puag ncig sab nraud. Tshwj xeeb tshaj yog nyob rau hauv high kub thiab high humidity ib puag ncig, tooj liab ntawv nyiaj tau tag nrho exert nws corrosion kuj, yog li xyuas kom meej stability thiab kev cia siab ntawm PCB.
3. Thaum tshav kub kub dissipation: Hauv qee cov khoom siv hluav taws xob uas yuav tsum tau ua haujlwm ntev, PCB circuits yuav ua kom muaj cua sov ntau dhau. Copper foil, raws li cov txheej txheem conductive hauv circuits, kuj tseem tuaj yeem ua cov txheej txheem cua sov los pab kom cov cua sov thiab ua kom ruaj khov ntawm cov khoom siv.