Dab tsi yog kev sib raug zoo ntawm PCB thaiv, los ntawm lub qhov thiab lub peev xwm nqa tam sim no?

Kev sib txuas hluav taws xob ntawm cov khoom ntawm PCBA yog ua tiav los ntawm cov ntawv xov tooj tooj liab thiab cov qhov ntawm txhua txheej.

Kev sib txuas hluav taws xob ntawm cov khoom ntawm PCBA yog ua tiav los ntawm cov ntawv xov tooj tooj liab thiab cov qhov ntawm txhua txheej. Vim yog cov khoom sib txawv, cov qauv sib txawv ntawm qhov sib txawv tam sim no, txhawm rau ua tiav txhua txoj haujlwm, cov neeg tsim qauv yuav tsum paub seb qhov tsim cov hlua thiab los ntawm lub qhov tuaj yeem nqa cov khoom siv tam sim no, txhawm rau ua tiav cov haujlwm ntawm cov khoom, tiv thaiv cov khoom. los ntawm hlawv thaum overcurrent.

Ntawm no qhia txog kev tsim thiab kev sim ntawm qhov tam sim no nqa lub peev xwm ntawm kev xaim thiab dhau qhov ntawm FR4 tooj liab-coated phaj thiab cov txiaj ntsig kev xeem. Cov txiaj ntsig kev xeem tuaj yeem muab qee yam kev siv rau cov neeg tsim qauv hauv kev tsim yav tom ntej, ua rau PCB tsim tsim nyog thiab ntau dua raws li cov kev xav tau tam sim no.

Kev sib txuas hluav taws xob ntawm cov khoom ntawm PCBA yog ua tiav los ntawm cov ntawv xov tooj tooj liab thiab cov qhov ntawm txhua txheej.

Nyob rau theem tam sim no, cov khoom tseem ceeb ntawm cov ntawv luam tawm Circuit Board (PCB) yog tooj liab coated phaj ntawm FR4. Cov ntawv ci tooj liab nrog tooj liab purity tsis tsawg dua 99.8% paub txog kev sib txuas hluav taws xob ntawm txhua qhov ntawm lub dav hlau, thiab los ntawm qhov (VIA) paub txog cov hluav taws xob sib txuas ntawm cov ntawv ci tooj liab nrog tib lub teeb liab ntawm qhov chaw.

Tab sis yuav ua li cas los tsim qhov dav ntawm cov ntawv ci tooj liab, yuav ua li cas los txhais lub aperture ntawm VIA, peb ib txwm tsim los ntawm kev paub dhau los.

Txhawm rau ua kom tsim qauv tsim tsim nyog thiab ua tau raws li qhov yuav tsum tau ua, lub peev xwm nqa tam sim no ntawm cov ntawv ci tooj liab nrog cov kab sib txawv ntawm cov xaim sib txawv, thiab cov txiaj ntsig tau siv los ua qhov siv rau kev tsim.

Kev tshuaj xyuas ntawm yam cuam tshuam rau lub peev xwm nqa tam sim no

Qhov loj ntawm PCBA tam sim no sib txawv nrog cov qauv ua haujlwm ntawm cov khoom, yog li peb yuav tsum xav txog seb cov hlua hluav taws xob uas ua raws li tus choj tuaj yeem lav qhov tam sim no dhau los. Cov yam tseem ceeb uas txiav txim siab txog kev nqa nqa tam sim no yog:

Copper foil thickness, hlau dav, kub nce, plating los ntawm qhov aperture. Hauv kev tsim tiag tiag, peb kuj yuav tsum xav txog cov khoom lag luam ib puag ncig, PCB tsim tshuab, phaj zoo thiab lwm yam.

1. Copper foil thickness

Thaum pib ntawm kev tsim khoom, tooj liab ntawv tuab ntawm PCB yog txhais raws li cov khoom lag luam thiab cov xwm txheej tam sim no ntawm cov khoom.

Feem ntau, rau cov khoom uas tsis muaj siab tam sim no, koj tuaj yeem xaiv qhov saum npoo (hauv) txheej ntawm tooj liab ntawv ci txog 17.5μm thickness:

Yog tias cov khoom muaj ib feem ntawm lub siab tam sim no, lub phaj loj txaus, koj tuaj yeem xaiv cov txheej txheej saum npoo (sab hauv) ntawm li 35μm thickness ntawm tooj liab ntawv ci;

Yog hais tias feem ntau ntawm cov teeb liab nyob rau hauv cov khoom yog siab tam sim no, lub puab txheej ntawm tooj liab ntawv ci txog 70μm tuab yuav tsum tau xaiv.

Rau PCB nrog ntau tshaj ob txheej, yog tias lub npoo thiab sab hauv tooj liab ntawv ci siv tib lub thickness thiab tib txoj kab uas hla, lub peev xwm nqa tam sim no ntawm cov txheej txheej saum npoo yog ntau dua li ntawm txheej sab hauv.

Siv 35μm tooj liab ntawv ci rau ob sab hauv thiab txheej txheej ntawm PCB raws li piv txwv: lub voj voog sab hauv yog laminated tom qab etching, yog li lub thickness ntawm cov ntaub ntawv tooj liab sab hauv yog 35μm.

Tom qab etching ntawm sab nraud Circuit Court, nws yog tsim nyog los laum qhov. Vim hais tias lub qhov tom qab drilling tsis muaj hluav taws xob kev sib txuas kev ua tau zoo, nws yog ib qho tsim nyog yuav tsum tau electroless tooj liab plating, uas yog tag nrho cov phaj tooj liab plating txheej txheem, yog li cov nto tooj liab ntawv ci yuav coated nrog ib tug tej thickness ntawm tooj liab, feem ntau ntawm 25μm thiab 35μm, yog li qhov tseeb thickness ntawm cov ntawv nyiaj sab nrauv yog li 52.5μm rau 70μm.

Qhov sib xws ntawm cov ntawv ci tooj liab sib txawv nrog lub peev xwm ntawm cov khoom siv tooj liab, tab sis qhov sib txawv tsis tseem ceeb, yog li kev cuam tshuam ntawm kev thauj khoom tam sim no tuaj yeem tsis quav ntsej.

2.Hlau kab

Tom qab cov ntawv ci tooj liab thickness raug xaiv, txoj kab dav dhau los ua qhov txiav txim siab ntawm lub peev xwm nqa tam sim no.

Muaj qee qhov sib txawv ntawm tus nqi tsim ntawm kab dav thiab tus nqi tiag tiag tom qab etching. Feem ntau, qhov tso cai sib txawv yog +10μm / -60μm. Vim tias cov hlua txuas tau raug etched, yuav muaj kua seem nyob rau hauv lub kaum sab xis, yog li lub ces kaum txuas feem ntau yuav dhau los ua qhov tsis muaj zog tshaj plaws.

Ua li no, thaum xam tus nqi thauj khoom tam sim no ntawm ib txoj kab nrog lub ces kaum, tus nqi thauj khoom tam sim no ntsuas ntawm txoj kab ncaj nraim yuav tsum muab faib ua (W-0.06) / W (W yog kab dav, chav tsev yog mm).

3. Kub nce

Thaum qhov kub nce mus txog lossis siab dua TG qhov kub ntawm lub substrate, nws yuav ua rau deformation ntawm lub substrate, xws li warping thiab bubbling, thiaj li yuav cuam tshuam rau lub binding quab yuam ntawm cov ntawv ci tooj liab thiab substrate. Lub warping deformation ntawm lub substrate yuav ua rau puas.

Tom qab cov kab hluav taws xob PCB hla dhau qhov tam sim no loj tam sim no, qhov chaw tsis muaj zog ntawm cov ntawv ci tooj liab tsis tuaj yeem ua kom sov rau ib puag ncig rau lub sijhawm luv luv, kwv yees lub adiabatic system, qhov kub thiab txias nce siab, ncav cuag qhov melting point ntawm tooj liab, thiab tooj liab hlau raug hlawv. .

4.Plating los ntawm qhov aperture

Electroplating los ntawm qhov tuaj yeem paub qhov hluav taws xob sib txuas ntawm cov txheej txheem sib txawv los ntawm electroplating tooj liab ntawm lub qhov phab ntsa. Txij li nws yog tooj liab plating rau tag nrho cov phaj, tooj liab thickness ntawm lub qhov phab ntsa yog tib yam rau cov plated los ntawm qhov ntawm txhua qhov aperture. Lub peev xwm nqa tam sim no ntawm plated los ntawm qhov nrog qhov sib txawv pore qhov ntau thiab tsawg nyob ntawm thaj tsam ntawm phab ntsa tooj liab