1. Multilayer PCB yog dab tsi?
Yuav kom ua tau raws li qhov chaw thiab qhov hnyav ntawm cov khoom siv hluav taws xob niaj hnub no, nws yog ib qho tsim nyog yuav tsum tau siv ntau txheej PCBs, uas, raws li lub npe qhia, muaj ntau txheej txheej ntawm cov khoom siv laminated ua ke los tsim ib lub rooj tsav xwm hauv Circuit Court. Multilayer PCBs yog tsim los siv kev kub siab thiab kub kub kom tso cai rau cov khaubncaws sab nraud povtseg kom nruj rau ib leeg thiab kom tsis txhob muaj cua npuas hauv lub rooj tsavxwm.
Kev siv thiab cov txiaj ntsig ntawm multilayer PCBs
Raws li cov khoom siv hluav taws xob niaj hnub ua me me thiab ntau txoj hauv kev ua haujlwm, multilayer PCBs muab ntau qhov zoo sib xws ntawm ib txheej PCBs, tshwj xeeb hauv cov ntawv thov hauv qab no:
Cov ntaub ntawv khaws cia, satellite systems, mobile kev sib txuas lus, teeb liab kis tau tus mob, muaj kev tswj hwm, khoom siv hauv chaw, kev tshawb nrhiav nuclear
Qhov zoo ntawm kev siv multilayer PCBs hauv cov ntawv thov no suav nrog:
1. Multilayer PCBs tuav ntau lub voj voog ntau dua li ib leeg- lossis ob tog PCBs, muab qhov chaw ntawm pawg thawj coj saib zoo ib yam. Kev sib dhos siab ceev ntawm multilayer PCBs ua rau lawv tsim nyog rau kev muaj peev xwm thiab kev kub ceev hauv cov txheej txheem nyuaj. 2.
2. Qhov me me thiab lub teeb yuag ntawm ntau txheej PCBs ua rau lawv zoo tagnrho rau cov khoom siv nrog qhov chaw thiab qhov hnyav.
3. Multilayer PCBs muaj kev ntseeg siab heev. 4.
4. Multilayer PCBs yog hloov tau thiab tuaj yeem siv rau hauv cov qauv hauv Circuit Court uas yuav tsum tau khoov.
5. Multilayer PCBs tuaj yeem tiv taus qhov kub thiab txias thiab tuaj yeem siv rau hauv cov khoom siv uas cov yam ntxwv ua haujlwm ntev ntawm Circuit Court yog qhov tseem ceeb.
6. Tswj impedance routing yog ib qho yooj yim hauv multilayer PCBs.
7. Lub hwj chim thiab hauv av txheej hauv ntau txheej PCBs pab ua kom tiav EMI shielding. 2.
2. Thermal stress nyob rau hauv multilayer PCBs
Thaum ua ntau txheej PCBs, cov nplooj ntawv ib nrab kho thiab cov txheej txheem tseem ceeb tau muab tso ua ke. Cov conductors yog encapsulated nyob rau hauv ib tug resin khoom thiab cov khaubncaws sab nraud povtseg yog bonded ua ke nrog adhesives. Tag nrho cov ntaub ntawv koom nrog hauv ntau txheej PCB muaj cov nqi sib txawv ntawm thermal expansion thiab contraction, hu ua coefficient ntawm thermal expansion (CTE). Qhov sib txawv ntawm CTE thiab qhov nce ntawm qhov kub thiab txias ua rau muaj qhov kub thiab txias thiab thermal stress field hauv multilayer PCB. Kev kub ntxhov siab tuaj yeem ua rau PCB deformation thiab ua rau muaj teeb meem loj hauv kev ua haujlwm hauv Circuit Court, kev ntseeg siab thiab lub neej ntev.
3. Qhov tseem ceeb ntawm thermal stress tsom xam ntawm multilayer PCBs
Kev ntsuam xyuas thermal yog ib qho kev ntsuas kub thiab kev ntxhov siab nyob rau hauv ntau txheej PCB uas siv thermal stress analysis los soj ntsuam qhov cuam tshuam ntawm qhov kub thiab txias cycling ntawm Circuit Court Cheebtsam thiab kev ua haujlwm. Cov txheej txheem ntawm lub cev ntawm multilayer PCB yog tom qab ntawd hloov kho raws li cov txiaj ntsig ntawm kev txheeb xyuas kev ntxhov siab thermal, uas yuav pab txo qhov kub thiab txias thermal kev nyuaj siab ntawm multilayer PCB.
Kev txheeb xyuas qhov kub ntxhov yog pab tau ntau txoj hauv kev, suav nrog
1. Muab cov khoom siv raws li qhov kub thiab txias thiab shear ntawm cov pob qij txha ntawm cov khoom sib txuas PCB.
2. kwv yees qhov muaj feem ntawm delamination thiab micro-cracking nyob rau hauv multilayer PCBs. 3.
3. twv seb puas yuav deformation nyob rau hauv multilayer PCBs.
Thaum tsim cov txheej txheem ntau lawm PCBs, cov txiaj ntsig ntawm kev ntsuam xyuas thermal muaj txiaj ntsig zoo los txo qhov kub thiab kev ntxhov siab nyob rau hauv multilayer PCBs thiab kuj los txhim kho cov thermal kev ntseeg siab, lub cev lub cev muaj zog thiab lub neej ntawm multilayer PCBs.
