Cov ntawv luam tawm hluav taws xob yog cov khoom siv hluav taws xob feem ntau. Niaj hnub no cov PCBs muaj ob peb txheej rau lawv: lub substrate, kab, cov npog ntsej muag, thiab silkscreen. Ib qho ntawm cov ntaub ntawv tseem ceeb tshaj plaws ntawm tus PCB yog tooj liab, thiab muaj ntau cov laj thawj vim li cas tooj liab siv lwm yam xws li txhuas los yog tin.
Dab tsi yog cov PCBs ua los ntawm?
Tau hais los ntawm lub tuam txhab PCB, PCBs tau ua los ntawm ib qho khoom hu ua AubSrate, uas yog ua los ntawm cov fiberglass uas tau txhawb nrog epoxy cob qhia. Saum toj no lub substrate yog ib txheej ntawm tooj liab ntawv ntawv uas tuaj yeem sib raug zoo ntawm ob sab lossis tsuas yog ib qho. Thaum lub substrate yog tsim, cov tuam ntxhab tso cov khoom sib xyaw rau nws. Lawv siv daim npog ntsej muag thiab cov tawv ncauj nrog cov resistors, capacitors, trantors, diodes, circuital chips, thiab lwm yam tshwj xeeb cheebtsam.
Vim li cas tooj liab ntawv ci siv rau PCBs?
PCB cov tuam ntxhab siv tooj liab vim tias nws muaj hluav taws xob zoo dua thiab thermal ua haujlwm. Raws li cov hluav taws xob hloov pauv nrog rau PCB, tus tooj liab ua kom sov los ntawm kev puas tsuaj thiab ntxhov siab tas ntawm tus PCB. Nrog lwm cov alloys - zoo li txhuas los yog tin - tus PCB yuav kub tsis sib xws thiab tsis ua haujlwm zoo.
Tooj liab yog tus nyiam alloy vim tias nws tuaj yeem xa cov cim hluav taws xob thoob plaws hauv lub rooj tsavxwm tsis muaj teeb meem tsis muaj hluav taws xob. Kev ua tau zoo ntawm cov cua sov hloov tso cai rau cov tuam ntxhab mus rau nruab qhov sov sov sov so rau saum npoo. Tooj liab nws tus kheej yog qhov ua tau zoo, raws li ooj tooj liab tuaj yeem npog ib qho xwm txheej ntawm PCB substrate ntawm 1.4 txhiab ntawm ib nti lossis 35 micrometers tuab.
Tooj liab tau zoo heev vim tias nws muaj lub tshuab hluav taws xob dawb uas tuaj yeem taug kev los ntawm ib qho atom mus rau lwm tus yam tsis tau qeeb. Vim tias nws tseem muaj txiaj ntsig ntawm cov qib yooj yim uas nws tau ua ntawm cov qib tuab, me me tooj liab mus ntev.
Tooj liab thiab lwm yam cov hlau uas muaj nqis uas siv hauv PCBs
Cov neeg feem coob pom tias muaj cov pejb ua tau ntsuab. Tab sis, lawv ib txwm muaj peb xim ntawm txheej sab nraud: kub, nyiaj, thiab liab. Lawv kuj tseem muaj tooj liab dawb sab hauv thiab sab nraud ntawm tus PCB. Lwm cov hlau ntawm cov Circuit Court Board qhia nyob rau hauv ntau yam xim. Txheej kub yog qhov kim tshaj plaws, txheej nyiaj nyiaj muaj tus nqi thib ob-siab tshaj plaws, thiab liab yog cov txheej tshaj plaws.
Siv kub hauv PCBs
Tooj liab nyob rau luam cov board
Cov kub-plated txheej yog siv rau txuas shrapnel thiab cov ntaub qhwv ntau. Lub ntsiab lus kub txheej los tiv thaiv kev tshem tawm ntawm cov atoms nto. Cov txheej tsis yog tsuas kub hauv cov xim, tab sis nws yog ua los ntawm cov kub tiag. Cov kub yog cov khoom kub heev tab sis yog qhov txaus los txuas ntxiv rau lub neej ntawm cov khoom siv uas yuav tsum tau tsim tawm. Cov kub tiv thaiv cov solder qhov chaw los ntawm corrooring dhau sijhawm.
Siv nyiaj thov cov nyiaj hauv PCBs
Nyiaj yog lwm cov hlau siv hauv PCB tsim. Nws yog qhov tsis tshua muaj nqi ntau dua li kub immersion. Nyiaj immersion tau siv tau rau hauv kub Immersion vim tias nws kuj tseem pab nrog kev sib txuas, thiab nws txo cov nqi ntawm cov nqi tag nrho. Nyiaj immersion feem ntau yog siv nyob rau hauv PCBs uas siv nyob rau hauv tsheb thiab computer peripherals.
Tooj liab clad laminate hauv PCBs
Hloov chaw siv kev siv cov IAVER, tooj liab yog siv rau hauv daim ntawv clad. Qhov no yog txheej liab ntawm PCB, thiab nws yog feem ntau siv hlau. Tus PCB yog tsim los ntawm tooj liab ua lub hauv paus hlau, thiab nws yog ib qho tsim nyog kom tau txais cov voj voog los txuas thiab tham nrog txhua lwm yam.
Yuav ua li cas yog tooj liab ntawv siv nyob rau hauv PCBs?
Tooj liab muaj ob peb siv nyob rau hauv PCBs, los ntawm tooj liab-clad laminate rau txoj kab. Tooj liab yog qhov tseem ceeb heev rau PCBs ua haujlwm kom tsim nyog.
Dab tsi yog PCB taug?
Ib qho pcb kab yog dab tsi nws suab zoo li, txoj hauv kev rau Circuit Court ua raws. Cov kab cim suav nrog kev network ntawm tooj liab, ntaub, thiab rwb thaiv tsev, nrog rau cov fuses thiab cov khoom siv uas tau siv rau ntawm lub rooj tsavxwm.
Txoj kev yooj yim tshaj plaws kom nkag siab txog ib txoj kab yog xav txog nws raws li txoj kev lossis choj. Kom haum rau cov tsheb, cov kab yuav tsum tau ua dav kom dav txaus los tuav tsawg kawg ob ntawm lawv. Nws yuav tsum tau ua tuab tuab tsis txhob vau plab. Lawv kuj yuav tsum tau ua cov ntaub ntawv uas yuav tiv thaiv qhov hnyav ntawm cov tsheb uas taug kev ntawm nws. Tab sis, kab ua txhua yam no rau ib qib me me kom txav hluav taws xob ntau dua li tsheb.
Cheebtsam ntawm PCB
Muaj ob peb lub zog uas ua rau PCB taug. Lawv muaj ntau txoj haujlwm uas yuav tsum tau ua rau pawg tswj hwm kom nws txoj haujlwm tsim nyog. Tooj liab yuav tsum tau siv los pab cov kab ua lawv txoj haujlwm, thiab tsis muaj PCB, peb yuav tsis muaj cov khoom siv hluav taws xob. Xav txog lub ntiaj teb tsis muaj smartphones, khoos phis tawm, kas fes kas fes, thiab tsheb. Ntawd yog dab tsi peb yuav muaj yog PCBs tsis siv tooj liab.
PCB Trace Thickness
Tus qauv PCB yog nyob ntawm lub thickness ntawm pawg thawj coj saib. Cov tuab yuav cuam tshuam qhov sib npaug thiab yuav ua kom cov khoom sib txuas.
PCB Trace Dav
Qhov dav ntawm lub lw kuj tseem ceeb heev. Qhov no tsis cuam tshuam rau qhov sib npaug lossis cov txuas ntawm cov khoom siv, tab sis nws ua kom cov kev hloov chaw tam sim no yam tsis muaj overhuming lossis ua rau lub rooj tsavxwm.
PCB LACE tam sim no
Lub PCB kab tawm tam sim no yog qhov tsim nyog vim tias qhov no yog lub rooj tsavxwm siv kom txav hluav taws xob los ntawm cov khoom siv thiab xov hlau. Tooj kho kom muaj qhov no tshwm sim, thiab cov hluav taws xob dawb ntawm txhua tus atom tau txais txoj kev txav mus los tau yooj yim dhau ntawm lub rooj tsavxwm.
Vim li cas tooj liab ntawv ci ntawm PCBs
Cov txheej txheem ntawm ua rau PCBs
Cov txheej txheem ntawm kev ua pcb yog tib yam. Qee cov tuam txhab ua nws nrawm dua li lwm tus, tab sis lawv txhua tus siv tib cov txheej txheem thiab cov ntaub ntawv. Cov no yog cov kauj ruam:
Ua ib lub hauv paus tawm ntawm fiberglass thiab resins
Tso lub tooj liab tso rau ntawm lub hauv paus
Txheeb xyuas thiab teeb tsa tus qauv tooj liab
Ntxuav lub rooj tsavxwm hauv da dej
Ntxiv rau daim npog qhov ncauj nrog tiv thaiv tus PCB
Affix lub silkscreen ntawm tus PCB
Qhov chaw thiab solder lub resistors, ciracuected ciracuits, capacitors, thiab lwm yam
Ntsuas PCB
PCBs yuav tsum muaj cov feem tshwj xeeb tshwj xeeb kom ua haujlwm zoo. Ib qho ntawm cov tseem ceeb tshaj plaws ntawm tus PCB yog tooj liab. Qhov no yog xav tau kev coj hluav taws xob ntawm cov cuab yeej uas cov PCBs yuav muab tso. Yog tsis muaj tooj liab, cov cuab yeej yuav tsis ua haujlwm vim tias hluav taws xob yuav tsis muaj ib lub alloy txav mus los.
Lub Sijhawm Post: Apr-25-2022