Xaiv PCB cov tuab tuab dhau los ua qhov teeb meem thaum a luam tawm hauv Circuit Court board (PCB) cov chaw tsim khoom tau txais cov lus hais thov kom tsim ntau tus neeg tsim khoom thiab cov ntaub ntawv xav tau tsis tiav lossis tsis tau hais qhia txhua. Qee zaum qhov no tshwm sim vim kev sib xyaw ntawm PCB cov khoom siv tseem ceeb tsis tseem ceeb rau kev ua haujlwm; Yog tias txhua qhov kev xav tau tuab tau ua tiav, cov neeg siv kawg yuav tsis quav ntsej txog cov tuab lossis hom ntawm txhua txheej.

Tab sis nyob rau lwm lub sijhawm, kev ua tau zoo yog qhov tseem ceeb dua thiab tuab yuav tsum tau nruj nreem tswj kom ua tau zoo. Yog tias PCB tus tsim qauv sib tham meej meej txhua qhov kev xav tau hauv cov ntaub ntawv, tom qab ntawd cov chaw tsim khoom yuav paub qhov xav tau yog dab tsi thiab yuav teeb tsa cov khoom raws li.

Teeb meem PCB tus tsim qauv yuav tsum xav txog

Nws pab cov tsim qauv nkag siab cov ntaub ntawv muaj thiab siv feem ntau, yog li lawv tuaj yeem siv cov cai tsim tsim los tsim PCBS sai thiab raug. Dab tsi hauv qab no yog cov lus piav qhia luv luv ntawm cov khoom siv hom twg uas cov neeg tsim khoom nyiam siv, thiab yam lawv yuav xav tau los ua haujlwm sai sai yam tsis ncua koj txoj haujlwm.

Nkag siab PCB laminate tus nqi thiab cov khoom muag

Nws yog ib qho tseem ceeb kom nkag siab tias PCB laminate cov ntaub ntawv tau muag thiab ua haujlwm hauv “txheej txheem” ​​thiab tias cov khoom siv tseem ceeb thiab npaj ua ntej khaws cia los ntawm cov chaw tsim khoom siv tam sim ntawd feem ntau yog los ntawm tib lub system. Hauv lwm lo lus, cov khoom sib xyaw yog txhua feem ntawm cov khoom lag luam tshwj xeeb, tab sis nrog qee qhov kev hloov pauv, xws li tuab, tooj liab hnyav thiab cov qauv prepreg. Ntxiv nrog rau kev paub dua thiab rov ua tau zoo, muaj lwm yam laj thawj los txwv cov hom laminate.

Prepreg thiab cov txheej txheem sab hauv tau tsim los ua haujlwm ua ke, tab sis yuav tsis ua haujlwm raug thaum siv ua ke nrog lwm cov khoom. Piv txwv li, Isola 370HR cov khoom siv tseem ceeb yuav tsis siv hauv pawg tib yam li Nelco 4000-13 prepreg. Nws muaj peev xwm lawv yuav ua haujlwm ua ke hauv qee qhov xwm txheej, tab sis feem ntau lawv yuav tsis ua. Cov txheej txheem sib txuas coj koj mus rau thaj chaw uas tsis tau txheeb xyuas, qhov twg tus cwj pwm ntawm cov ntaub ntawv (paub zoo thaum siv los ua cov homogeneous systems) tsis tuaj yeem raug tso cai ntxiv lawm. Kev tsis saib xyuas lossis tsis sib xyaw thiab sib xyaw ntawm cov khoom siv hom tuaj yeem ua rau muaj kev ua tsis tiav, yog li tsis muaj cov chaw tsim khoom yuav sib xyaw thiab sib dhos tshwj tsis yog hom pom tseeb tias tsim nyog rau “sib xyaw” pawg.

Lwm qhov laj thawj kom khaws cov khoom lag luam nqaim yog tus nqi siab ntawm UL ntawv pov thawj, yog li nws ib txwm muaj hauv PCB kev lag luam txhawm rau txwv tus naj npawb ntawm cov ntawv pov thawj rau kev xaiv cov khoom me me. Cov neeg tsim khoom feem ntau yuav pom zoo ua cov khoom ntawm laminate yam tsis muaj cov qauv txheem, tab sis paub tias lawv tsis tuaj yeem muab UL ntawv pov thawj los ntawm QC cov ntaub ntawv. Qhov no yog qhov kev xaiv zoo rau cov qauv uas tsis yog UL yog tias nws tau nthuav tawm thiab pom zoo ua ntej thiab cov chaw tsim khoom tau paub txog kev ua tiav ntawm cov txheej txheem laminating hauv nqe lus nug. Rau UL ua haujlwm, nws yog qhov zoo tshaj kom paub cov chaw tsim khoom lag luam uas koj xaiv thiab tsim cov laug cam kom phim nws.

Ipc-4101d thiab siv cov ntawv ci

Tam sim no cov lus tseeb no tau qhib rau qhib, muaj ob yam ntxiv uas yuav tsum paub ua ntej dhia mus rau hauv kev tsim qauv. Ua ntej tshaj, nws yog qhov zoo tshaj plaws los qhia cov laminates raws li kev lag luam tshwj xeeb IPC-4101D thiab tsis qhia npe cov khoom tshwj xeeb uas tsis yog txhua tus tuaj yeem khaws tau.

Qhov thib ob, nws yog qhov yooj yim tshaj plaws los tsim ntau txheej siv txheej txheem “ntawv ci”. Kev tsim cov ntawv txhais tau hais tias txheej txheej saum toj thiab hauv qab (sab nrauv) yog tsim los ntawm ib daim ntawm cov ntawv ci tooj liab thiab laminated mus rau cov txheej ntxiv nrog prepreg. Thaum nws yuav zoo li qhov xav tau los tsim 8-txheej PCB nrog plaub lub ntsej muag cores, nws yog qhov zoo dua los siv cov ntawv ci sab nrauv ua ntej, thiab tom qab ntawd peb lub cores rau L2-L3, L4-L5, thiab L6-L7. Hauv lwm lo lus, npaj los tsim cov txheej ntau txheej kom cov cores muaj raws li hauv qab no: (tag nrho cov txheej txheej rho tawm 2) faib ua 2. Ntxiv mus, nws muaj txiaj ntsig kom paub qee yam txog cov yam ntxwv tseem ceeb. Lawv tus kheej.

Cov tub ntxhais tau muab kho kom zoo PIECE ntawm FR4 nrog tooj liab plated ntawm ob sab. Cov tub ntxhais muaj ntau qhov tuab, thiab feem ntau siv qhov ntau thiab tsawg feem ntau yog khaws cia hauv cov khoom lag luam loj. Cov no yog cov tuab tuab uas yuav tsum nco ntsoov, tshwj xeeb tshaj yog thaum koj xav tau xaj cov khoom hloov pauv sai kom koj tsis txhob nkim sijhawm ua ntej ntawm qhov kev xaj tos cov khoom uas tsis yog tus qauv tuaj txog ntawm tus xa khoom.

Cov hlau tseem ceeb thiab tooj liab tuab

Cov cores feem ntau siv los tsim 0.062 “tuab tuab tuab yog 0.005”, 0.008 “, 0.014”, 0.021 “, 0.028”, thiab 0.039 “. Cov khoom lag luam ntawm 0.047 “kuj tseem muaj, vim tias nws qee zaum siv los tsim 2 txheej txheej. Lwm cov tub ntxhais uas ib txwm yuav khaws cia yog 0.059 hauv., Vim tias nws tau siv los tsim 2-ply boards uas yog 0.062 in. Txog txoj haujlwm no, peb txwv qhov txwv rau tus qauv tsim nrog qhov kawg nominal tuab ntawm 0.062 nti.

Tooj tooj liab tuab los ntawm ib nrab ounce mus rau peb rau plaub ooj, nyob ntawm tus tsim khoom tshwj xeeb cov khoom sib xyaw, tab sis cov khoom lag luam feem ntau tuaj yeem ua ob ooj lossis tsawg dua. Khaws qhov no hauv siab thiab nco ntsoov tias yuav luag txhua cov khoom lag luam yuav siv tib qhov hnyav tooj liab ntawm ob sab ntawm cov tub ntxhais. Sim ua kom tsis txhob muaj PCB tsim qauv uas xav tau tooj liab sib txawv ntawm txhua sab, feem ntau qhov no xav tau kev yuav khoom tshwj xeeb thiab yuav xav tau them sai (maj xa khoom), qee zaum txawm tias tsis tau ntsib tus xa khoom yam tsawg kawg nkaus.

Piv txwv li, yog tias koj xav siv 1oz tooj liab ntawm lub dav hlau thiab npaj yuav siv H oz ntawm lub teeb liab, txiav txim siab ua lub dav hlau hauv H oz lossis nce lub teeb liab mus rau 1oz kom ua rau cov tub ntxhais siv ob sab zoo li tooj liab nrog qhov hnyav. Tau kawg, koj tsuas tuaj yeem ua qhov no yog tias koj tseem tuaj yeem ua tau raws li qhov xav tau hluav taws xob ntawm kev tsim qauv thiab muaj XY thaj chaw txaus kom haum raws txoj kab dav/qhov chaw tsim qauv kom tau raws li 1oz yam tsawg kawg ntawm txheej teeb liab. Yog tias koj tuaj yeem ua tau raws cov xwm txheej no, nws yog qhov zoo tshaj los siv nws zoo li tooj liab hnyav. Txwv tsis pub, koj yuav tsum tau txiav txim siab ob peb hnub ntxiv ntawm lub sijhawm ua cov hmoov txhuas.

Piv txwv tias koj tau xaiv qhov tuab tuab tsim nyog thiab muaj qhov hnyav tooj liab, ntau yam sib xyaw ua ke ntawm cov ntawv npaj ua ntej tau siv los tsim cov chaw dielectric seem kom txog rau thaum tag nrho cov tuab tuab xav tau. Txog kev tsim qauv uas tsis xav tau kev tiv thaiv kev tiv thaiv, koj tuaj yeem tawm qhov kev xaiv ua ntej rau tus tsim khoom. Lawv yuav siv lawv qhov kev xav tau “tus qauv”. Ntawm qhov tod tes, yog tias koj muaj qhov xav tau kev tiv thaiv, hais qhia cov kev xav no hauv cov ntaub ntawv kom cov chaw tsim khoom tuaj yeem kho tus nqi npaj ua ntej ntawm cov cores kom tau raws li qhov tshwj xeeb tau teev tseg.

Impedance tswj

Txawm hais tias yuav tsum muaj kev tiv thaiv impedance lossis tsis yog, nws tsis pom zoo tias koj sim sau cov hom thiab tuab ntawm prepreg rau txhua qhov chaw tshwj tsis yog tias koj paub zoo hauv qhov kev coj ua no.Feem ntau, cov pob khoom ntxaws ntxaws thaum kawg yuav tsum tau kho, yog li lawv tuaj yeem ua rau qeeb. Hloov chaw, koj daim duab kab ntawv tuaj yeem pom cov tuab tuab ntawm txheej txheej hauv qab thiab qhia “kev npaj ua ntej yuav tsum tau ua raws li qhov cuam tshuam thiab qhov xav tau tuab tag nrho”. Qhov no tso cai rau cov tuam txhab tsim cov txheej txheem zoo tshaj plaws kom phim koj tus qauv.

Qhov profile

Ib pawg zoo ntawm cov cores raws li cov khoom lag luam uas twb muaj lawm yog qhov tseem ceeb txhawm rau zam kev ncua sijhawm tsis tseem ceeb thaum xaj nrawm nrawm nrog lub sijhawm nruj. Feem ntau cov tuam txhab tsim khoom siv PCB siv cov txheej txheem sib txuam zoo sib xws raws li cov kernel zoo ib yam li lawv cov neeg sib tw. Tshwj tsis yog PCB tau hloov kho siab heev, tsis muaj kev tsim khawv koob lossis zais zais. Yog li ntawd, nws yog qhov tsim nyog paub koj tus kheej nrog cov khoom siv nyiam rau ib txheej tshwj xeeb thiab ua txhua lub dag zog los tsim PCB kom phim nws. Yuav muaj ib qho kev zam tshwj xeeb rau kev tsim tshwj xeeb, tab sis feem ntau, cov khoom siv txheem yog qhov kev xaiv zoo tshaj plaws.