Tus tsim qauv ntawm ib multilayer pcb (luam tawm cov boardracuit Court) tuaj yeem nyuaj heev. Qhov tseeb tias tus qauv siv txawm tias yuav tsum tau siv ntau tshaj ob txheej txhais tau tias qhov yuav tsum tau muaj pes tsawg tus neeg yuav tsum tau nruab ntawm sab saum toj thiab hauv qab. Txawm tias thaum lub voj voog sib haum nyob rau hauv ob txheej txheej sab nraud, tus tsim qauv PCB tuaj yeem txiav txim siab ntxiv lub zog hluav taws xob thiab hauv av sab hauv kom kho cov tsis taus kev ua haujlwm.
Los ntawm cov teeb meem thermal los ua cov khoom siv ua kom zoo nkauj Txawm li cas los xij, txawm hais tias koj thawj ua haujlwm ua tus tsim qauv yog txhawm rau txhawm rau cov teeb meem hluav taws xob, nws yog ib qho tseem ceeb tsis quav ntsej txog kev teeb tsa lub cev ntawm cov Circuit Court Board. Cov tshuab hluav taws xob tsis zoo yuav tseem khoov lossis ntswj, ua kom sib dhos los yog txawm tsis yooj yim sua. Hmoov zoo, ua tib zoo mloog rau PCB lub cev kev teeb tsa thaum lub voj voog tsim kev yuav txo cov teeb meem yav tom ntej. Txheej-rau-txheej tshuav yog ib qho ntawm cov tseem ceeb ntawm cov tshuab ruaj khov barracuit Court board.
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Balanced pcb stacking
Sib tw stacking yog ib pawg nyob rau hauv uas txheej txheej saum npoo thiab hla-seem kev tsim qauv ntawm cov ntawv luam tawm hluav taws xob yog ob qho laj thawj. Lub hom phiaj yog txhawm rau tshem tawm thaj chaw uas yuav deform thaum raug rau kev ntxhov siab thaum lub sijhawm cov txheej txheem ntau lawm, tshwj xeeb yog thaum lub sijhawm lamination theem. Thaum cov Circuit Court board yog deformed, nws yog qhov nyuaj rau nteg nws ncaj rau kev sib dhos. Qhov no yog qhov tseeb tshwj xeeb rau cov laug cam uas yuav sib sau ua ke ntawm cov kab npoo av thiab cov kab. Hauv cov xwm txheej hnyav, deformation tseem tuaj yeem cuam tshuam cov kev sib txoos ntawm cov sib sau ua ke PCBA (luam tawm Circuit Court sib dhos) mus rau hauv cov khoom kawg.
IPC cov qauv tshuaj ntsuam xyuas yuav tsum tiv thaiv cov laug cam loj tshaj plaws los ntawm kev ncav cuag koj cov cuab yeej. Txawm li cas los xij, yog tus PCB cov txheej txheem tsis tiav ntawm kev tswj hwm, tom qab ntawd lub hauv paus ua rau muaj feem cuam tshuam nrog tus qauv. Yog li, nws raug nquahu kom koj ua tib zoo khij pcb txheej txheem thiab ua kom cov kev hloov kho tsim nyog ua ntej tso koj thawj qhov kev txiav txim siab ua ntej. Qhov no tuaj yeem tiv thaiv cov qoob loo tsis zoo.
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Circuit Court Board
Ib qho kev tsim qauv tsim tshwj xeeb yog tias cov ntawv luam tawm cov board yuav tsis muaj peev xwm ua tiav cov tiaj tus qauv vim tias nws txoj kev sib tshuam hla nws lub chaw. Piv txwv li, yog tias muaj 8 txheej txheej qauv siv 4 txheej txheem teeb tsa hauv qab no, thaum cov khoom siv hluav taws xob hauv nroog thiab nias, tag nrho cov laminate yuav deformed.
Yog li ntawd, nws yog kev xyaum zoo los tsim cov pawg kom cov hom tooj liab txheej (dav hlau lossis teeb liab) yog daim iav nrog rau kev hwm rau lub chaw. Hauv daim duab hauv qab no, cov cim saum toj thiab hauv qab thiab L2-L7, L3-L6 thiab L4-L5. Tej zaum cov ntawv them nyiaj tooj liab rau tag nrho cov teeb liab txheej yog sib piv, thaum lub planar txheej feem ntau yog tsim ntawm cov khoom ncaj qha copper. Yog tias qhov xwm txheej no, tom qab ntawd Circuit Court Board muaj lub sijhawm zoo los ua kom tiav daim tiaj tiaj, tiaj tiaj, uas yog qhov zoo tagnrho rau kev sib dhos ua ke.
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PCB Dielectric Txheej Thickness
Nws kuj yog tus cwj pwm zoo kom sib npaug ntawm cov tuab ntawm daim dielectric txheej ntawm tag nrho cov pawg. Qhov tsim nyog, cov tuab ntawm txhua daim dielectric yuav tsum tau mirrored nyob rau hauv ib qho zoo li txheej txheej yog mirrored.
Thaum cov tuab tuab sib txawv, nws yuav nyuaj rau tau txais cov pab pawg uas yooj yim rau kev tsim khoom. Qee lub sij hawm vim muaj cov yam ntxwv xws li kav hlau txais xov, asymmetric stacking tej zaum yuav muaj kev ncua deb ntawm cov kav hlau txais xov thiab thov kom paub tseeb tias yuav tsum ua kom tiav txhua yam ua ntej ua tiav. Lwm txoj kev xaiv. Thaum cov chaw ua haujlwm tsis sib luag yog qhov yuav tsum tau ua, feem ntau cov tuam ntxhab yuav thov kom so lossis tshem tawm kev zam kev, thiab yog tias lawv tso tsis tau, lawv kuj yuav tso tawm haujlwm. Lawv tsis xav rov tsim kho ob peb lub hnab ntim khoom kim nrog cov khoom lag luam qis, thiab tom qab ntawd thaum kawg tau txais cov kev tsim nyog muaj cai txaus kom tau raws li kev txiav txim kom muaj nuj nqis.
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PCB cov teeb meem tuab
Cov hneev thiab twists yog cov teeb meem zoo tshaj plaws. Thaum koj pawg tsis sib thooj, muaj lwm qhov xwm txheej uas ua rau muaj kev sib cav hauv kev kuaj tuab ntawm cov haujlwm sib txawv ntawm cov Circuit Court Board. Cov xwm txheej no tau tshwm sim los ntawm kev tsim me me tsim etersights thiab yog qhov tsis tshua muaj zog, tab sis nws tuaj yeem tshwm sim yog tias koj cov txheej txheem ib txwm muaj cov khaubncaws sab nraud povtseg ntawm tib qho chaw. Nws feem ntau pom ntawm cov laug cam uas siv tsawg kawg 2 ooj tooj liab thiab tus lej ntawm cov khaubncaws sab nraud. Dab tsi tshwm sim yog ib thaj tsam ntawm pawg thawj coj tau muaj ntau tus nqi loj loj-choled thaj chaw, thaum lwm qhov yog tus tooj liab dawb xwb. Thaum cov khaubncaws sab nraud povtseg yog laminated ua ke, tus tooj liab-muaj sab yog nias rau ib qho tuab, thaum lub tooj liab dawb yog nias.
Feem ntau Circuit Court pawg siv ib nrab ooj lossis 1 ooj tooj liab yuav tsis cuam tshuam ntau, tab sis cov loj dua tus tooj liab, ntau dua qhov tuab tuab dua. Piv txwv li, yog tias koj muaj 8 txheej ntawm 3 ooj tooj liab, thaj chaw nrog cov nyiaj tooj liab sib zog tuaj yeem yooj yim poob qis dua tag nrho cov tuab tuab. Txhawm rau tiv thaiv qhov no los ntawm kev tshwm sim, nco ntsoov hliv lub tooj liab liab rau hauv tag nrho cov txheej txheej. Yog tias qhov no yog qhov tsis sib xws rau cov hluav taws xob lossis kev txiav txim siab hnyav, tsawg kawg ib co plated los ntawm lub teeb tooj liab txheej thiab paub tseeb tias suav cov ntaub qhwv rau qhov ntawm txhua txheej. Cov qhov qauv / ncoo qauv yuav muab kev txhawb nqa tshuab ntawm y axis, yog li txo cov thickness poob.
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Kev pab txi
Txawm tias thaum tsim qauv thiab tso tawm ntau txheej txheej pcbs, koj yuav tsum xyuam xim rau ob qho hluav taws xob thiab kev ua kom muaj zog, txawm tias koj yuav tsum tau ua kom tiav ntawm cov qauv siv tau thiab ua tiav. Thaum hnyav cov kev xaiv, nco ntsoov tias yog tias nws tsis yooj yim los yog sib tw ntawm rab phom thiab twisted, tus qauv tsim nrog cov yam ntxwv zoo meej yog ntawm kev siv me me. Sib npaug ntawm pawg thiab them sai sai rau cov tooj liab faib ntawm txhua txheej. Cov kauj ruam no nce cov tau thaum kawg tau txais cov Circuit Courruit Board uas yooj yim sib sau ua ke thiab nruab.