Cov laug cam luam tawm yog cov khoom tseem ceeb ntawm feem ntau cov khoom siv hluav taws xob. Cov PCBs niaj hnub no muaj ntau txheej rau lawv: lub substrate, cov kab, lub ntsej muag solder, thiab silkscreen. Ib qho ntawm cov ntaub ntawv tseem ceeb tshaj plaws ntawm PCB yog tooj liab, thiab muaj ntau yam laj thawj vim li cas tooj liab thiaj siv es tsis txhob siv lwm yam alloys xws li txhuas lossis tin.
Cov PCBs Ua Los Ntawm Dab Tsi?
Ib lub tuam txhab sib dhos PCB tau hais tias, PCBs yog ua los ntawm ib yam khoom hu ua substrate, uas yog ua los ntawm fiberglass uas tau txhawb nrog epoxy resin. Saum toj ntawm lub substrate yog ib txheej ntawm cov ntawv ci tooj liab uas tuaj yeem sib txuas rau ob sab lossis tsuas yog ib sab xwb. Thaum lub substrate ua tiav lawm, cov chaw tsim khoom muab cov khoom tso rau ntawm nws. Lawv siv lub ntsej muag solder thiab silkscreen nrog rau resistors, capacitors, transistors, diodes, circuit chips, thiab lwm yam khoom tshwj xeeb heev.
Vim li cas cov ntawv ci tooj liab thiaj siv rau hauv PCBs?
Cov chaw tsim khoom PCB siv tooj liab vim nws muaj kev ua hluav taws xob thiab cua sov zoo dua. Thaum cov hluav taws xob txav mus nrog PCB, tooj liab tiv thaiv qhov kub kom tsis txhob ua puas thiab ua rau lub PCB seem ntxhov siab. Nrog rau lwm cov hlau sib xyaw - xws li txhuas lossis tin - PCB tuaj yeem ua kom sov tsis sib npaug thiab tsis ua haujlwm zoo.
Tooj liab yog cov hlau uas nyiam siv vim nws tuaj yeem xa cov teeb liab hluav taws xob hla lub rooj tsavxwm yam tsis muaj teeb meem poob lossis qeeb hluav taws xob. Qhov ua tau zoo ntawm kev hloov pauv cua sov tso cai rau cov chaw tsim khoom los teeb tsa cov dab dej cua sov ib txwm muaj rau ntawm qhov chaw. Tooj liab nws tus kheej ua tau zoo, vim tias ib ooj ntawm tooj liab tuaj yeem npog ib square foot ntawm PCB substrate ntawm 1.4 thousandths ntawm ib nti lossis 35 micrometers tuab.
Tooj liab muaj zog heev vim nws muaj ib lub electron dawb uas tuaj yeem mus los ntawm ib lub atom mus rau lwm lub yam tsis qeeb. Vim tias nws tseem ua haujlwm tau zoo ntawm qib nyias heev li nws ua ntawm qib tuab, me ntsis tooj liab mus tau ntev heev.
Tooj Liab thiab Lwm Cov Hlau Muaj Nqis Siv Hauv PCBs
Feem ntau cov neeg paub tias PCBs yog xim ntsuab. Tiam sis, feem ntau lawv muaj peb xim rau ntawm txheej sab nraud: kub, nyiaj, thiab liab. Lawv kuj muaj tooj liab dawb huv sab hauv thiab sab nraud ntawm PCB. Lwm cov hlau ntawm lub rooj tsav xwm Circuit Court tshwm sim hauv ntau xim. Txheej kub yog qhov kim tshaj plaws, txheej nyiaj muaj tus nqi thib ob siab tshaj plaws, thiab xim liab yog txheej pheej yig tshaj plaws.
Siv Immersion Gold hauv PCBs
tooj liab ntawm lub rooj tsavxwm luam tawm
Cov txheej kub plated no siv rau cov khoom siv sib txuas thiab cov ntaub qhwv khoom. Cov txheej kub immersion muaj nyob rau hauv kom tiv thaiv kev hloov pauv ntawm cov atoms saum npoo. Cov txheej tsis yog tsuas yog xim kub xwb, tab sis nws yog ua los ntawm kub tiag tiag. Cov kub yog nyias heev tab sis txaus los txuas lub neej ntawm cov khoom uas yuav tsum tau soldered. Cov kub tiv thaiv cov khoom soldering los ntawm corroding dhau sijhawm.
Siv Immersion Silver hauv PCBs
Nyiaj yog lwm yam hlau siv rau hauv kev tsim PCB. Nws pheej yig dua li kub immersion. Silver immersion siv tau hloov chaw kub immersion vim nws kuj pab nrog kev sib txuas, thiab nws txo cov nqi tag nrho ntawm lub rooj tsavxwm. Silver immersion feem ntau siv rau hauv PCBs uas siv rau hauv tsheb thiab cov khoom siv computer.
Tooj Liab Clad Laminate hauv PCBs
Es tsis txhob siv cov khoom siv immersion, tooj liab siv rau hauv daim ntawv clad. Qhov no yog txheej liab ntawm PCB, thiab nws yog cov hlau siv ntau tshaj plaws. PCB yog ua los ntawm tooj liab ua lub hauv paus hlau, thiab nws yog qhov tsim nyog kom tau txais cov circuits txuas thiab sib txuas lus zoo.
Cov Ntawv Nyiaj Tooj Liab Siv Li Cas Hauv PCBs?
Tooj liab muaj ntau yam siv rau hauv PCBs, txij li cov laminate uas muaj tooj liab npog mus rau cov kab me me. Tooj liab yog qhov tseem ceeb rau PCBs kom ua haujlwm tau zoo.
PCB Trace yog dab tsi?
Ib txoj kab cim PCB yog qhov nws suab zoo li, ib txoj kev rau lub voj voog ua raws. Txoj kab cim suav nrog lub network ntawm tooj liab, cov xov hlau, thiab cov rwb thaiv tsev, nrog rau cov fuses thiab cov khoom siv uas siv rau ntawm lub rooj tsavxwm.
Txoj kev yooj yim tshaj plaws los nkag siab txog ib txoj kab yog xav txog nws zoo li txoj kev lossis choj. Yuav kom haum rau cov tsheb, txoj kab yuav tsum dav txaus kom tuav tau tsawg kawg yog ob lub. Nws yuav tsum tuab txaus kom tsis txhob tawg thaum muaj kev nyuaj siab. Lawv kuj yuav tsum tau ua los ntawm cov ntaub ntawv uas yuav tiv taus qhov hnyav ntawm cov tsheb uas taug kev ntawm nws. Tab sis, cov kab ua txhua yam no me dua kom txav hluav taws xob dua li cov tsheb.
Cheebtsam ntawm PCB Trace
Muaj ntau yam khoom uas ua rau PCB trace. Lawv muaj ntau yam haujlwm uas yuav tsum tau ua kom lub rooj tsavxwm ua haujlwm tau zoo. Yuav tsum siv tooj liab los pab cov trace ua haujlwm, thiab yog tsis muaj PCB, peb yuav tsis muaj cov khoom siv hluav taws xob. Xav txog lub ntiaj teb uas tsis muaj xov tooj ntse, laptops, lub tshuab ua kas fes, thiab tsheb. Yog li ntawd peb yuav muaj yog tias PCBs tsis siv tooj liab.
PCB qhov tuab
Tus qauv PCB nyob ntawm seb lub rooj tsavxwm tuab npaum li cas. Qhov tuab ntawd yuav cuam tshuam rau qhov sib npaug thiab yuav ua rau cov khoom sib txuas ua ke.
PCB Qhov Dav Dav
Qhov dav ntawm qhov kab kuj tseem ceeb. Qhov no tsis cuam tshuam rau qhov sib npaug lossis kev txuas ntawm cov khoom, tab sis nws ua rau tam sim no hloov pauv yam tsis muaj overheating lossis ua rau lub rooj tsavxwm puas tsuaj.
PCB Trace Tam Sim No
Qhov hluav taws xob ntawm PCB yog qhov tsim nyog vim qhov no yog qhov uas lub rooj tsavxwm siv los txav hluav taws xob hla cov khoom thiab cov xov hlau. Tooj liab pab qhov no tshwm sim, thiab cov electron dawb ntawm txhua lub atom ua rau cov hluav taws xob txav mus zoo thoob plaws lub rooj tsavxwm.
Vim li cas cov ntawv ci tooj liab thiaj li nyob rau ntawm pcbs
Cov Txheej Txheem Ua PCBs
Cov txheej txheem ntawm kev ua PCB yog tib yam. Qee lub tuam txhab ua nws sai dua li lwm tus, tab sis lawv txhua tus siv cov txheej txheem thiab cov ntaub ntawv zoo ib yam. Cov no yog cov kauj ruam:
Ua lub hauv paus tawm ntawm fiberglass thiab resins
Muab cov txheej tooj liab tso rau ntawm lub hauv paus
Txheeb xyuas thiab teeb tsa cov qauv tooj liab
Ntxuav lub rooj tsavxwm hauv chav dej
Ntxiv lub npog ntsej muag los tiv thaiv PCB
Muab daim ntawv silkscreen lo rau ntawm PCB
Muab thiab solder cov resistors, integrated circuits, capacitors, thiab lwm yam khoom
Sim cov PCB
Cov PCBs yuav tsum muaj cov khoom tshwj xeeb heev kom ua haujlwm tau zoo. Ib qho ntawm cov khoom tseem ceeb tshaj plaws ntawm PCB yog tooj liab. Cov hlau no yog qhov xav tau los coj hluav taws xob ntawm cov khoom siv uas cov PCBs yuav raug muab tso rau hauv. Yog tsis muaj tooj liab, cov khoom siv yuav tsis ua haujlwm vim tias hluav taws xob yuav tsis muaj cov hlau txav mus los.
Lub sijhawm tshaj tawm: Plaub Hlis-25-2022