Rigid-flex circuit boards: cov ntsiab lus tseem ceeb hauv kev ua thiab lamination.

Hauv kev ua cov flex Circuit Court boards, ib qho nyuaj nyuaj yog yuav ua li cas kom ua tau zoo nias ntawm cov pob qij txha ntawm cov laug cam. Tam sim no, qhov no tseem yog ib qho tseem ceeb uas cov tuam txhab PCB yuav tsum tau them nyiaj tshwj xeeb rau. Hauv qab no, Capel yuav muab cov lus qhia ntxaws ntxaws rau ntau lub ntsiab lus uas xav tau kev saib xyuas.

Rigid Flexible PCB Substrate thiab Prepreg Lamination: Cov Ntsiab Lus Tseem Ceeb rau Warpage Reduction thiab Thermal Stress Relief

Txawm hais tias koj tab tom ua substrate lamination lossis yooj yim prepreg lamination, ua tib zoo mloog rau lub warp thiab weft ntawm iav ntaub yog qhov tseem ceeb. Tsis quav ntsej txog cov xwm txheej no tuaj yeem ua rau muaj kev ntxhov siab ntau ntxiv thiab kev ua tsov rog. Txhawm rau kom ntseeg tau qhov txiaj ntsig zoo tshaj plaws los ntawm txheej txheem lamination, yuav tsum tau them nyiaj rau cov yam ntxwv no. Cia peb delve rau hauv lub ntsiab lus ntawm warp thiab weft cov lus qhia, thiab tshawb nrhiav txoj hauv kev zoo los txo cov kev ntxhov siab thermal thiab txo warpage.

Substrate lamination thiab prepreg lamination yog cov txheej txheem hauv kev tsim khoom, tshwj xeeb tshaj yog hauv kev tsim cov ntawv luam tawm Circuit Board (PCBs), cov khoom siv hluav taws xob thiab cov khoom sib xyaw. Cov txheej txheem no koom nrog kev sib txuas cov txheej txheem ntawm cov khoom ua ke los tsim cov khoom muaj zog thiab ua haujlwm kawg. Ntawm ntau qhov kev txiav txim siab rau kev ua tiav lamination, kev taw qhia ntawm daim ntaub iav hauv warp thiab weft plays lub luag haujlwm tseem ceeb.

Warp thiab weft xa mus rau ob lub ntsiab lus qhia ntawm fibers hauv cov ntaub ntawv xws li iav ntaub. Kev taw qhia warp feem ntau khiav mus rau qhov ntev ntawm lub yob, thaum lub weft kev taw qhia khiav perpendicular mus rau warp. Cov kev taw qhia no yog qhov tseem ceeb vim tias lawv txiav txim siab cov khoom siv kho tshuab, xws li lub zog tensile thiab qhov ntev stability.

Thaum nws los txog rau substrate lamination los yog prepreg lamination, warp thiab weft kev sib raug zoo ntawm cov iav ntaub yog ib qho tseem ceeb rau kev tswj cov khoom uas xav tau ntawm cov khoom kawg. Tsis ua raws li cov kev taw qhia no yuav ua rau muaj kev cuam tshuam ntawm cov qauv kev ncaj ncees thiab muaj kev pheej hmoo ntawm kev ua tsov rog.

Thermal stress yog lwm yam tseem ceeb uas yuav tau xav txog thaum lamination. Thermal stress yog cov strain lossis deformation uas tshwm sim thaum cov khoom raug hloov ntawm qhov kub thiab txias. Nws tuaj yeem ua rau muaj ntau yam teeb meem xws li warping, delamination, thiab txawm tias txhua yam tsis ua haujlwm ntawm cov qauv laminated.

Txhawm rau kom txo qis kev ntxhov siab thermal thiab ua kom cov txheej txheem lamination ua tiav, nws yog ib qho tseem ceeb kom ua raws li qee cov lus qhia. Ua ntej thiab qhov tseem ceeb tshaj plaws, xyuas kom meej tias cov ntaub iav yog khaws cia thiab ua haujlwm hauv qhov chaw tswj qhov kub thiab txias kom txo qhov kub ntawm qhov sib txawv ntawm cov khoom thiab txheej txheem lamination. Cov kauj ruam no yuav pab txo qis kev pheej hmoo ntawm warping vim yog thermal expansion lossis contraction.

Tsis tas li ntawd, tswj cov cua sov thiab cua txias thaum lub sij hawm lamination tuaj yeem txo qhov kev ntxhov siab ntxiv. Cov thev naus laus zis ua rau cov khoom siv maj mam hloov pauv mus rau qhov kub thiab txias, txo qhov kev pheej hmoo ntawm warping lossis qhov hloov pauv.

Qee zaum, nws yuav muaj txiaj ntsig zoo rau kev siv cov txheej txheem thermal kev ntxhov siab xws li kev kho tom qab lamination. Cov txheej txheem cuam tshuam nrog cov txheej txheem laminated kom tswj tau thiab hloov pauv qhov kub thiab txias kom txo tau cov kev ntxhov siab thermal residual. Nws pab txo qis warpage, txhim kho qhov ruaj khov thiab ua kom lub neej ntev ntawm cov khoom laminated.

Ntxiv nrog rau cov kev txiav txim siab no, nws tseem ceeb heev rau kev siv cov khoom zoo thiab ua raws li cov txheej txheem tsim khoom tsim nyog thaum txheej txheem lamination. Kev xaiv cov ntaub iav zoo nkauj thiab cov ntaub ntawv sib xyaw ua ke ua kom zoo tshaj plaws kev ua tau zoo thiab txo qhov kev pheej hmoo ntawm kev sib tsoo thiab kev ntxhov siab thermal.

Tsis tas li ntawd, kev siv cov txheej txheem ntsuas qhov tseeb thiab txhim khu kev qha, xws li laser profilometry lossis strain gauges, tuaj yeem muab kev nkag siab zoo rau kev ua tsov rog thiab kev ntxhov siab ntawm cov qauv laminated. Kev saib xyuas tsis tu ncua ntawm cov kev txwv no tso cai rau kev hloov kho raws sijhawm thiab kho qhov tsim nyog los tswj cov qauv kev xav tau zoo.

Ib qho tseem ceeb uas yuav tau xav txog thaum xaiv cov khoom tsim nyog rau ntau daim ntawv thov yog lub thickness thiab hardness ntawm cov khoom.

Qhov no yog qhov tseeb tshwj xeeb tshaj yog rau cov laug cam uas yuav tsum muaj qee qhov tuab thiab nruj kom ntseeg tau tias muaj kev ua haujlwm zoo thiab ua haujlwm ntev.

Qhov hloov pauv ntawm lub rooj tsavxwm nruj yog feem ntau nyias nyias thiab tsis muaj cov ntaub iav. Qhov no ua rau nws raug rau ib puag ncig thiab thermal shocks. Ntawm qhov tod tes, qhov nruj ntawm lub rooj tsavxwm yuav tsum nyob ruaj khov los ntawm cov xwm txheej sab nraud.

Yog tias qhov nruj ntawm lub rooj tsavxwm tsis muaj qee qhov tuab lossis tawv, qhov sib txawv ntawm qhov nws hloov pauv piv rau qhov hloov pauv tau tuaj yeem pom. Qhov no tuaj yeem ua rau muaj kev kub ntxhov hnyav thaum siv, uas tuaj yeem cuam tshuam tsis zoo rau cov txheej txheem soldering thiab tag nrho kev ua haujlwm ntawm lub rooj tsavxwm.

Txawm li cas los xij, qhov sib txawv no yuav tshwm sim tsis tseem ceeb yog tias qhov nruj ntawm lub rooj tsavxwm muaj qee qhov tuab lossis tawv. Txawm hais tias qhov hloov pauv hloov pauv, tag nrho flatness ntawm lub rooj tsavxwm yuav tsis cuam tshuam. Qhov no ua kom lub rooj tsavxwm ruaj khov thiab txhim khu kev qha thaum siv thiab siv.

Nws yog tsim nyog sau cia tias thaum lub thickness thiab hardness yog ib qho tseem ceeb, muaj kev txwv rau qhov zoo tagnrho thickness. Yog hais tias cov khoom ua tuab dhau lawm, tsis tsuas yog lub rooj tsavxwm yuav hnyav, tab sis nws kuj yuav tsis muaj nyiaj txiag. Nrhiav qhov sib npaug ntawm qhov tuab, qhov tawv thiab qhov hnyav yog qhov tseem ceeb rau kev ua kom zoo tshaj plaws thiab kev ua haujlwm zoo.

Kev sim dav dav tau ua tiav los txiav txim siab qhov zoo tagnrho thickness rau cov laug cam. Cov kev sim no qhia tau hais tias lub thickness ntawm 0.8 hli mus rau 1.0 hli yog tsim nyog. Nyob rau hauv qhov ntau, lub rooj tsavxwm ncav cuag qhov xav tau ntawm cov thickness thiab nruj thaum tseem tuav tau qhov hnyav.

Los ntawm kev xaiv lub rooj tsavxwm nruj nrog qhov tsim nyog thickness thiab hardness, cov tuam ntxhab thiab cov neeg siv tuaj yeem ua kom ntseeg tau tias lub rooj tsavxwm yuav nyob twj ywm thiab ruaj khov txawm tias nyob rau hauv cov xwm txheej sib txawv. Qhov no zoo heev txhim kho lub zuag qhia tag nrho zoo thiab kev ntseeg siab ntawm cov txheej txheem soldering thiab muaj nyob ntawm lub rooj tsavxwm.

Cov teeb meem uas yuav tsum tau them sai sai rau thaum machining thiab haum:

Rigid flex Circuit Court boards yog ib qho kev sib xyaw ua ke ntawm cov txheej txheem yooj yim thiab cov laug cam. Qhov kev sib xyaw ua ke no ua ke qhov zoo ntawm ob qho, uas muaj ob qho tib si yooj yim ntawm cov ntaub ntawv nruj thiab solidity. Cov khoom xyaw tshwj xeeb no yuav tsum tau ua cov txheej txheem tshwj xeeb los xyuas kom meej qhov ua tau zoo tshaj plaws.

Thaum tham txog kev kho cov qhov rais hloov tau ntawm cov laug cam, milling yog ib txoj hauv kev. Feem ntau hais lus, muaj ob txoj hauv kev rau milling: ob qho tib si milling ua ntej, thiab tom qab ntawd flexibly milling, lossis tom qab ua tiav tag nrho cov txheej txheem dhau los thiab qhov kawg molding, siv laser txiav kom tshem tawm cov khib nyiab. Qhov kev xaiv ntawm ob txoj kev nyob ntawm tus qauv thiab thickness ntawm cov mos mos thiab tawv ua ke board nws tus kheej.

Yog hais tias lub qhov rais hloov tau yog thawj millted los xyuas kom meej qhov tseeb milling yog ib qho tseem ceeb heev. Milling yuav tsum raug, tab sis tsis dhau me me vim tias nws yuav tsum tsis txhob cuam tshuam cov txheej txheem vuam. Txog qhov kawg no, engineers tuaj yeem npaj cov ntaub ntawv milling thiab tuaj yeem ua ntej-milling ntawm lub qhov rais hloov tau raws li. Los ntawm qhov no, deformation tuaj yeem tswj tau, thiab cov txheej txheem vuam tsis cuam tshuam.

Ntawm qhov tod tes, yog tias koj xaiv tsis milling lub qhov rais hloov tau, laser txiav yuav ua lub luag haujlwm. Laser txiav yog ib txoj hauv kev zoo los tshem tawm cov khib nyiab qhov rai. Txawm li cas los xij, xyuam xim rau qhov tob ntawm laser txiav FR4. Yuav tsum tau ua kom zoo dua qhov kev txwv tsis pub kom tsim nyog los xyuas kom meej qhov ua tiav ntawm cov qhov rais hloov tau yooj yim.

Txhawm rau txhawm rau txhim kho cov kev txwv tsis pub muaj zog, cov kev txwv tsis siv los ntawm kev xa mus rau cov substrates hloov tau yooj yim thiab cov laug cam yog qhov zoo. Qhov kev ua kom zoo tshaj plaws no tuaj yeem ua kom ntseeg tau tias qhov tsim nyog tau siv thaum lub sij hawm txheej txheej, yog li tsim kom muaj kev sib koom ua ke zoo thiab nyuaj.

Cov saum toj no yog peb yam uas xav tau kev saib xyuas tshwj xeeb thaum ua thiab nias nruj flex Circuit Court boards. Yog tias koj muaj lus nug ntxiv txog Circuit Board, thov koj xav tiv tauj peb. Capel tau sau 15 xyoo ntawm kev nplua nuj nyob hauv kev lag luam hauv Circuit Court, thiab peb cov thev naus laus zis hauv kev ua haujlwm nruj-flex boards yog qhov paub tab.