Flatness thiab loj tswj teeb meem hauv 2-txheej PCB pawg-ups

Zoo siab txais tos rau Capel's blog, qhov twg peb tham txog txhua yam PCB kev tsim khoom. Hauv tsab xov xwm no, peb yuav hais txog cov teeb meem tshwm sim hauv 2-txheej PCB stackup kev tsim kho thiab muab cov kev daws teeb meem los daws cov teeb meem flatness thiab loj.Capel tau ua lub chaw tsim khoom ntawm Rigid-Flex PCB, Flexible PCB, thiab HDI PCB txij li xyoo 2009. Peb muaj ntau tshaj 100 tus kws tshaj lij engineers nrog ntau tshaj 15 xyoo ntawm kev paub hauv PCB kev lag luam thiab tau cog lus los muab cov neeg siv khoom zoo PCB. kev daws teeb meem.

Flatnessyog ib qho tseem ceeb uas yuav tau xav txog thaum ua hauj lwm nrog PCB stackups vim nws ncaj qha cuam tshuam rau tag nrho cov kev ua tau zoo thiab kev ntseeg siab ntawm cov khoom kawg. Lub tiaj tus PCB zoo kawg nkaus yog qhov tseem ceeb rau kev sib dhos kom zoo, muab cov khoom pov tseg kom raug, thiab ua kom muaj cua sov zoo. Ib qho kev sib txawv ntawm qhov flatness tuaj yeem ua rau tsis zoo rau kev sib koom ua ke, cov khoom siv misalignment, lossis txawm tias muaj kev ntxhov siab ntawm lub rooj tsav xwm Circuit Court uas tuaj yeem ua rau hluav taws xob luv lossis qhib.

Dimensional tswjyog lwm qhov tseem ceeb hauv kev tsim PCB, vim nws ua kom ntseeg tau tias lub rooj tsavxwm yuav haum rau qhov tseeb hauv nws qhov chaw kaw. Kev tswj xyuas qhov tseeb tso cai rau PCB sib txuas ua ke rau hauv cov khoom kawg, tsis txhob cuam tshuam nrog lwm cov khoom lossis cov khoom siv.

Wb delve rau hauv qee qhov kev daws teeb meem zoo los kov yeej cov teeb meem flatness thiab seem tswj cov teeb meem hauv 2-txheej PCB stackups.

1. Cov khoom siv xaiv:
Xaiv cov khoom tsim nyog yog lub hauv paus ntawm lub tiaj tus PCB. Xaiv cov laminates zoo nrog kev ruaj ntseg zoo. Xav txog kev siv qis CTE (coefficient ntawm thermal expansion) cov ntaub ntawv xws li FR-4, uas txo qhov kev pheej hmoo ntawm warping vim kub hloov thaum lub sij hawm tsim khoom los yog siv.

2. Kev txiav txim kom raug stacking:
Kev npaj ntawm cov khaubncaws sab nraud povtseg hauv ib pawg tuaj yeem cuam tshuam rau flatness. Xyuas kom cov khaubncaws sab nraud povtseg tau zoo thiab cov core thiab prepreg cov ntaub ntawv raug faib symmetrically. Kev ntsuas qhov sib faib ntawm cov txheej tooj liab nyob rau hauv pawg kuj txhawb nqa thermal expansion, yog li txo qhov peev xwm rau warping.

3. Tswj impedance routing:
Kev ua raws li kev tswj hwm cov cim impedance tsis yog tsuas yog qhov tseem ceeb rau kev ncaj ncees ntawm cov teeb liab tab sis kuj tseem pab tswj kom muaj kev ncaj ncees. Siv impedance-tswj routing cov tswv yim los tiv thaiv ntau qhov sib txawv ntawm tooj liab thickness thoob plaws lub rooj tsavxwm, uas tuaj yeem ua rau khoov lossis warping.

4. Vias thiab plated los ntawm qhov:
Lub xub ntiag ntawm vias thiab plated los ntawm qhov (PTH) tuaj yeem qhia cov ntsiab lus kev ntxhov siab thiab cuam tshuam rau flatness. Tsis txhob tso cov vias lossis PTHs hauv thaj chaw uas lawv tuaj yeem cuam tshuam txog kev ncaj ncees ntawm pawg thawj coj. Hloov chaw, xav txog kev siv qhov muag tsis pom lossis faus vias kom txo qis qhov muaj peev xwm warping los ntawm cov txheej txheem drilling lossis plating.

5. Thermal tswj:
Kev ua kom muaj cua sov kom zoo yog qhov tseem ceeb rau kev tswj kom tiaj tus. Thermal vias yog siv los tshem tawm cov cua sov tawm ntawm qhov kub ntawm lub rooj tsavxwm. Tsis tas li ntawd, xav txog kev siv lub dav hlau tooj liab lossis lub dab dej kub kom dissipate cua sov kom zoo dua. Kev tswj xyuas kom zoo thermal tsis tsuas yog tiv thaiv warping, tab sis kuj txhim khu kev ntseeg tag nrho ntawm PCB.

6. Precise manufacturing txheej txheem:
Ua haujlwm nrog cov chaw tsim khoom muaj npe zoo li Capel uas muaj kev paub dhau los hauv kev tsim cov PCBs zoo. Cov txheej txheem tsim khoom siab tshaj plaws, suav nrog precision etching, tswj lamination thiab ntau txheej xovxwm, yog qhov tseem ceeb rau kev ua tiav flatness thiab seem tswj.

7. Kev tswj xyuas kev ua tau zoo:
Kev tswj xyuas nruj nruj yog siv thoob plaws hauv cov txheej txheem tsim khoom. Qhov no suav nrog kev tshuaj xyuas tsis tu ncua, cov txheej txheem metrology siab heev thiab ua raws li cov qauv kev lag luam. Kev tswj xyuas zoo ua kom ntseeg tau tias kev ua kom zoo thiab kev tswj xyuas qhov ntev ib txwm ua tau.

Hauv cov ntsiab lus,flatness thiab seem tswj yog qhov tseem ceeb rau kev ua tiav ntawm 2-txheej PCB stackup. Los ntawm kev ua tib zoo xaiv cov ntaub ntawv, ua raws li cov txheej txheem sib dhos kom raug, ua raws li kev tswj hwm kev tswj hwm, tswj cov cua sov kom zoo, thiab ua haujlwm nrog cov chaw tsim khoom muaj kev paub zoo li Capel, koj tuaj yeem kov yeej cov kev cov nyom no thiab ua tiav cov kev ua tau zoo ntawm PCB. Tsis txhob cuam tshuam rau PCB qhov zoo - ntseeg Capel kom ua tau raws li txhua yam koj xav tau PCB.