Rigid-flex printed circuit boards (PCBs) yog qhov nrov rau lawv cov kev ua tau zoo thiab ua haujlwm ntev hauv ntau yam kev siv hluav taws xob. Cov laug cam no paub txog lawv lub peev xwm los tiv thaiv kev khoov thiab torsional kev ntxhov siab thaum tswj kev sib txuas hluav taws xob txhim khu kev qha.Tsab ntawv xov xwm no yuav ua tib zoo saib cov ntaub ntawv uas siv hauv rigid-flex PCBs kom nkag siab txog lawv cov khoom thiab cov khoom. Los ntawm kev nthuav tawm cov ntaub ntawv uas ua kom nruj-flex PCBs muaj zog thiab hloov tau yooj yim, peb tuaj yeem nkag siab tias lawv pab txhawb rau kev nce qib ntawm cov khoom siv hluav taws xob.
1. Nkag siab covrigid-flex PCB qauv:
Lub rigid-flex PCB yog lub rooj tsav xwm luam tawm uas sib txuas ua ke nruj thiab hloov tau yooj yim los tsim cov qauv tshwj xeeb. Qhov kev sib xyaw ua ke no ua rau cov rooj sib tham hauv Circuit Court muaj peb-dimensional circuitry, muab kev tsim qauv yooj yim thiab qhov chaw zoo rau cov khoom siv hluav taws xob. Cov qauv ntawm rigid-flex boards muaj peb lub ntsiab txheej. Thawj txheej yog txheej nruj, ua los ntawm cov khoom siv nruj xws li FR4 lossis cov tub ntxhais hlau. Cov txheej txheem no muab kev txhawb nqa thiab kev ruaj ntseg rau PCB, ua kom nws ruaj khov thiab ua haujlwm tsis zoo rau cov neeg kho tshuab kev ntxhov siab.
Cov txheej thib ob yog txheej txheej hloov tau los ntawm cov ntaub ntawv xws li polyimide (PI), kua siv lead ua polymer (LCP) lossis polyester (PET). Cov txheej no tso cai rau PCB khoov, twist thiab khoov yam tsis muaj kev cuam tshuam rau nws cov khoom siv hluav taws xob. Qhov yooj yim ntawm cov txheej no yog qhov tseem ceeb rau cov ntawv thov uas xav tau PCB kom haum rau qhov tsis sib xws lossis nruj. Qhov thib peb txheej yog cov nplaum nplaum, uas khi cov txheej nruj thiab hloov tau yooj yim ua ke. Cov txheej no feem ntau yog ua los ntawm epoxy lossis acrylic cov ntaub ntawv, xaiv rau lawv lub peev xwm los muab kev sib raug zoo ntawm cov txheej thaum tseem muab cov khoom hluav taws xob zoo. Cov nplaum nplaum ua lub luag haujlwm tseem ceeb hauv kev ua kom muaj kev ntseeg siab thiab kev pabcuam lub neej ntawm rigid-flex boards.
Txhua txheej hauv cov txheej txheem nruj-flex PCB tau ua tib zoo xaiv thiab tsim kom tau raws li cov kev xav tau ntawm cov khoom siv thiab hluav taws xob. Qhov no ua rau PCBs ua haujlwm tau zoo hauv ntau yam kev siv, los ntawm cov neeg siv khoom siv hluav taws xob mus rau cov khoom siv kho mob thiab aerospace systems.
2. Cov khoom siv hauv cov txheej txheem nruj:
Hauv kev tsim cov txheej txheem nruj-flex PCBs, ntau cov ntaub ntawv feem ntau siv los muab kev txhawb nqa tsim nyog thiab kev ncaj ncees. Cov ntaub ntawv no tau ua tib zoo xaiv raws li lawv cov yam ntxwv tshwj xeeb thiab kev ua tau zoo. Qee cov khoom siv feem ntau siv rau cov khaubncaws sab nraud povtseg hauv nruj-flex PCBs suav nrog:
A. FR4: FR4 yog cov txheej txheem nruj siv dav hauv PCBs. Nws yog iav-reinforced epoxy laminate nrog zoo heev thermal thiab mechanical zog. FR4 muaj qhov nruj nruj, tsis muaj dej nqus thiab ua haujlwm zoo. Cov khoom no ua rau nws zoo tagnrho raws li cov txheej txheem nruj raws li nws muab cov qauv kev ntseeg tau zoo thiab ruaj khov rau PCB.
B. Polyimide (PI): Polyimide yog cov khoom siv hluav taws xob hloov tau yooj yim uas feem ntau siv rau hauv cov rooj zaum tsis yooj yim vim nws qhov kub tsis kam. Polyimide paub txog nws cov khoom siv hluav taws xob zoo heev thiab kev ruaj ntseg, ua rau nws tsim nyog siv los ua cov txheej txheem nruj hauv PCBs. Nws tuav nws cov khoom siv tshuab thiab hluav taws xob txawm tias thaum raug kub hnyiab, ua rau nws haum rau ntau yam kev siv.
C. Hlau Core: Qee zaum, thaum yuav tsum muaj kev tswj xyuas thermal zoo, cov khoom siv hlau hlau xws li txhuas lossis tooj liab tuaj yeem siv los ua cov txheej txheem nruj hauv rigid-flex PCBs. Cov ntaub ntawv no muaj cov thermal conductivity zoo heev thiab tuaj yeem cuam tshuam cov cua sov uas tsim los ntawm circuits. Los ntawm kev siv cov tub ntxhais hlau, rigid-flex boards tuaj yeem tswj cov cua sov thiab tiv thaiv overheating, ua kom muaj kev ntseeg siab thiab kev ua haujlwm.
Txhua yam ntawm cov ntaub ntawv no muaj nws tus kheej zoo thiab raug xaiv raws li cov kev cai tshwj xeeb ntawm PCB tsim. Cov yam ntxwv xws li kev ua haujlwm kub, kev ntxhov siab thiab kev tswj xyuas thermal uas yuav tsum tau ua txhua lub luag haujlwm tseem ceeb hauv kev txiav txim siab cov ntaub ntawv tsim nyog rau kev sib txuas cov txheej txheem nruj thiab hloov tau yooj yim PCB.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias kev xaiv cov khoom siv rau cov txheej txheem nruj-flex PCBs yog ib qho tseem ceeb ntawm cov txheej txheem tsim. Kev xaiv cov khoom tsim nyog ua kom muaj kev ncaj ncees ntawm cov qauv, kev tswj xyuas thermal thiab tag nrho kev ntseeg siab ntawm PCB. Los ntawm kev xaiv cov ntaub ntawv zoo, cov neeg tsim qauv tuaj yeem tsim cov PCB nruj-flex uas ua tau raws li cov kev cai nruj ntawm ntau yam kev lag luam, suav nrog tsheb, aerospace, kev kho mob, thiab kev sib txuas lus.
3. Cov khoom siv hauv cov txheej txheem hloov tau:
Cov khaubncaws sab nraud povtseg hauv nruj-flex PCBs pab txhawb kev khoov thiab folding yam ntxwv ntawm cov laug cam. Cov khoom siv rau cov txheej txheem yooj yim yuav tsum muaj qhov yooj yim, elasticity thiab tsis kam rov ua dua. Cov khoom siv dav siv rau cov khaubncaws sab nraud povtseg muaj xws li:
A. Polyimide (PI): Raws li tau hais ua ntej lawm, polyimide yog cov khoom siv ntau yam uas ua haujlwm rau ob lub hom phiaj hauv kev nruj-flex PCBs. Nyob rau hauv cov txheej txheem flex, nws tso cai rau lub rooj tsavxwm khoov thiab khoov yam tsis tau poob nws cov khoom hluav taws xob.
B. Liquid Crystal Polymer (LCP): LCP yog cov khoom siv thermoplastic uas muaj kev ua haujlwm siab uas paub txog nws cov khoom siv zoo heev thiab ua haujlwm rau qhov kub thiab txias. Nws muab kev ua tau zoo heev, qhov ruaj khov thiab cov dej noo tsis kam rau cov qauv PCB nruj-flex.
C. Polyester (PET): Polyester yog cov khoom siv uas tsis tshua muaj nqi, lub teeb yuag nrog kev ua haujlwm zoo thiab cov khoom siv insulating. Nws yog feem ntau siv rau nruj-flex PCBs qhov twg tus nqi-zoo thiab muaj peev xwm khoov nruab nrab yog qhov tseem ceeb.
D. Polyimide (PI): Polyimide yog cov khoom siv feem ntau hauv cov txheej txheem PCB yooj yooj yim. Nws muaj qhov ua tau zoo heev, qhov kub thiab txias tsis kam thiab cov khoom siv hluav taws xob zoo. Polyimide zaj duab xis tuaj yeem yooj yim laminated, etched thiab bonded rau lwm txheej ntawm PCB. Lawv tuaj yeem tiv taus rov qab khoov yam tsis tau poob lawv cov khoom hluav taws xob, ua rau lawv zoo tagnrho rau cov khaubncaws sab nraud povtseg.
E. Cov kua siv lead ua kua polymer (LCP): LCP yog cov khoom siv thermoplastic uas muaj kev ua haujlwm siab uas tau siv ntau dua los ua cov txheej txheem yooj yim hauv cov PCBs nruj. Nws muaj cov khoom siv kho tshuab zoo heev, suav nrog kev ua haujlwm siab, qhov ruaj khov thiab ua haujlwm zoo rau qhov kub thiab txias. LCP cov yeeb yaj kiab muaj hygroscopicity tsawg thiab tsim nyog rau kev siv hauv qhov chaw ntub dej. Lawv kuj muaj cov tshuaj tiv thaiv zoo thiab tsis tshua muaj dielectric tsis tu ncua, kom ntseeg tau tias kev ua tau zoo hauv cov xwm txheej hnyav.
F. Polyester (PET): Polyester, tseem hu ua polyethylene terephthalate (PET), yog cov khoom siv hnyav thiab raug nqi siv nyob rau hauv cov khaubncaws sab nraud povtseg ntawm rigid-flex PCBs. PET zaj duab xis muaj qhov yooj yooj yim, siab tensile lub zog thiab zoo thermal stability. Cov yeeb yaj kiab no muaj qhov nqus dej tsawg thiab muaj cov khoom siv hluav taws xob zoo. PET feem ntau raug xaiv thaum muaj txiaj ntsig zoo thiab muaj peev xwm khoov nruab nrab yog qhov tseem ceeb hauv PCB tsim.
G. Polyetherimide (PEI): PEI yog cov khoom siv hluav taws xob zoo siv hluav taws xob siv rau cov txheej txheem hloov pauv ntawm cov khoom muag-nyuaj PCBs. Nws muaj cov khoom siv kho tshuab zoo heev, suav nrog kev ua haujlwm siab, qhov ruaj khov thiab ua haujlwm rau huab cua kub. PEI zaj duab xis muaj qhov nqus dej tsawg thiab muaj tshuaj lom neeg zoo. Lawv kuj muaj lub zog dielectric siab thiab cov khoom siv hluav taws xob, ua rau lawv tsim nyog rau kev thov.
H. Polyethylene naphthalate (PEN): PEN yog cov khoom siv kub-resistant thiab hloov tau yooj yim siv rau cov txheej txheem ntawm rigid-flex PCBs. Nws muaj qhov zoo thermal stability, tsis tshua muaj noo noo nqus thiab zoo heev mechanical zog. PEN zaj duab xis tiv taus UV hluav taws xob thiab tshuaj lom neeg. Lawv kuj muaj qhov tsis tshua muaj dielectric tsis tu ncua thiab zoo heev hluav taws xob rwb thaiv tsev. PEN zaj duab xis tuaj yeem tiv taus rov qab khoov thiab folding yam tsis cuam tshuam rau nws cov khoom hluav taws xob.
I. Polydimethylsiloxane (PDMS): PDMS yog cov khoom siv hloov pauv tau yooj yim siv rau cov txheej txheem ntawm cov mos mos thiab tawv ua ke PCBs. Nws muaj cov khoom siv kho tshuab zoo heev, suav nrog kev hloov pauv siab, elasticity thiab tsis kam rov kho dua. PDMS films kuj muaj qhov zoo thermal stability thiab hluav taws xob rwb thaiv tsev. PDMS feem ntau yog siv rau hauv cov ntawv thov uas xav tau cov ntaub ntawv mos, ncab thiab xis, xws li cov khoom siv hluav taws xob hnav thiab cov khoom siv kho mob.
Txhua yam ntawm cov ntaub ntawv no muaj nws tus kheej zoo, thiab kev xaiv ntawm flex txheej khoom nyob ntawm seb cov kev cai tshwj xeeb ntawm PCB tsim. Cov yam ntxwv xws li kev yooj yim, qhov kub thiab txias tsis kam, noo noo tsis kam, kev ua haujlwm zoo thiab khoov muaj peev xwm ua lub luag haujlwm tseem ceeb hauv kev txiav txim siab cov khoom tsim nyog rau cov txheej txheem hloov pauv hauv cov txheej txheem nruj-flex PCB. Ua tib zoo saib xyuas ntawm cov xwm txheej no ua kom muaj kev ntseeg siab ntawm PCB, ua haujlwm ntev thiab ua haujlwm tau zoo hauv ntau yam kev siv thiab kev lag luam.
4.Adhesive cov ntaub ntawv nyob rau hauv nruj-flex PCBs:
Txhawm rau txuas cov txheej txheem nruj thiab hloov tau yooj yim ua ke, cov ntaub ntawv nplaum yog siv hauv kev tsim kho PCB nruj. Cov ntaub ntawv sib txuas no ua kom muaj kev ruaj ntseg hluav taws xob sib txuas ntawm cov khaubncaws sab nraud povtseg thiab muab cov khoom tsim nyog rau kev txhawb nqa. Ob qho khoom siv sib txuas ua ke yog:
A. Epoxy Resin: Epoxy resin-raws li cov nplaum nplaum yog dav siv rau lawv cov kev sib raug zoo siab thiab cov khoom siv hluav taws xob zoo heev. Lawv muab cov thermal stability zoo thiab txhim khu lub zuag qhia tag nrho rigidity ntawm Circuit Court board.
b. Acrylic: Acrylic-raws li adhesives yog nyiam nyob rau hauv daim ntawv thov qhov yooj yim thiab noo noo kuj tseem ceeb heev. Cov nplaum no muaj lub zog sib txuas zoo thiab lub sijhawm kho luv dua li epoxy.
C. Silicone: Silicone-raws li adhesives feem ntau yog siv rau hauv rigid-flex boards vim lawv yooj, zoo thermal stability, thiab tsis kam mus ya raws thiab tshuaj. Silicone adhesives tuaj yeem tiv taus ntau qhov kub thiab txias, ua rau lawv haum rau cov ntawv thov uas xav tau ob qho tib si yooj thiab kub ua haujlwm. Lawv muab kev sib raug zoo ntawm cov khaubncaws sab nraud povtseg thiab hloov tau yooj yim thaum tuav cov khoom siv hluav taws xob uas yuav tsum tau muaj.
D. Polyurethane: Polyurethane adhesives muab qhov sib npaug ntawm kev yooj yim thiab kev sib txuas lub zog hauv cov PCB nruj-flex. Lawv muaj qhov zoo adhesion rau ntau yam substrates thiab muaj kev tiv thaiv zoo heev rau cov tshuaj lom neeg thiab kub hloov pauv. Polyurethane nplaum kuj nqus kev co thiab muab txhua yam kev ruaj ntseg rau PCB. Lawv feem ntau siv nyob rau hauv daim ntawv thov uas yuav tsum tau yooj thiab robustness.
E. UV Curable Resin: UV curable resin yog ib qho nplaum uas kho tau sai heev thaum raug ultraviolet (UV) lub teeb. Lawv muab kev sib txuas ceev ceev thiab kho lub sijhawm, ua rau lawv haum rau cov khoom ntim siab. UV-curable resins muab cov adhesion zoo rau ntau yam ntaub ntawv, suav nrog cov tawv tawv thiab hloov tau yooj yim. Lawv kuj muaj cov tshuaj tiv thaiv zoo heev thiab cov khoom hluav taws xob. UV-kho tau cov resins feem ntau yog siv rau rigid-flex PCBs, qhov chaw ua haujlwm ceev ceev thiab txhim khu kev qha kev sib txuas yog qhov tseem ceeb.
F. Pressure Sensitive Adhesive (PSA): PSA yog cov khoom siv nplaum uas tsim cov ntawv cog lus thaum siv siab. Lawv muab kev sib txuas yooj yim, yooj yim rau kev sib khi-flex PCBs. PSA muab adhesion zoo rau ntau qhov chaw, nrog rau cov tawv tawv thiab hloov tau yooj yim. Lawv tso cai rau repositioning thaum lub sij hawm sib dhos thiab tuaj yeem tshem tau yooj yim yog tias xav tau. PSA kuj muaj qhov ua tau zoo thiab sib xws, ua rau nws tsim nyog rau cov ntawv thov uas xav tau PCB dabtsi yog khoov thiab khoov.
Xaus:
Rigid-flex PCBs yog ib qho tseem ceeb ntawm cov khoom siv hluav taws xob niaj hnub no, tso cai rau cov qauv tsim hauv Circuit Court hauv cov pob khoom sib txuam thiab ntau yam. Rau cov kws tshaj lij thiab cov neeg tsim qauv txhawm rau txhim kho kev ua tau zoo thiab kev ntseeg siab ntawm cov khoom siv hluav taws xob, nws yog ib qho tseem ceeb kom nkag siab txog cov ntaub ntawv siv hauv lawv cov kev tsim kho. Kab lus no tsom mus rau cov khoom siv feem ntau siv hauv kev tsim kho-flex PCB, suav nrog cov txheej txheem nruj thiab hloov tau yooj yim thiab cov ntaub nplaum. Los ntawm kev txiav txim siab txog yam xws li rigidity, yooj, kub tsis kam thiab nqi, electronics manufacturers tuaj yeem xaiv cov ntaub ntawv zoo raws li lawv cov kev thov tshwj xeeb. Txawm hais tias nws yog FR4 rau cov khaubncaws sab nraud povtseg, polyimide rau cov khaubncaws sab nraud povtseg, lossis epoxy rau kev sib txuas, txhua yam khoom siv ua lub luag haujlwm hauv kev ua kom lub zog thiab kev ua haujlwm ntawm rigid-flex PCBs hauv kev lag luam hluav taws xob niaj hnub no ua lub luag haujlwm tseem ceeb.
Post lub sij hawm: Sep-16-2023
Rov qab
