In PCB tsim, muaj ntau qhov chaw uas yuav tsum tau xav txog kev nyab xeeb nyob deb. Ntawm no, nws tau muab faib ua ob pawg rau lub sijhawm tam sim no: ib qho yog hluav taws xob ntsig txog kev nyab xeeb kev nyab xeeb, thiab lwm yam yog tsis muaj hluav taws xob cuam tshuam txog kev nyab xeeb.

1. Hluav taws xob ntsig txog kev nyab xeeb deb
1. Qhov sib nrug ntawm cov xov hlau

Raws li qhov muaj peev xwm ua tiav ntawm cov tuam txhab PCB tseem muaj kev txhawj xeeb, qhov tsawg kawg nkaus ntawm cov xov hlau yuav tsum tsis pub tsawg dua 4mil. Qhov tsawg kawg kab nrug kuj yog qhov kev ncua deb ntawm kab mus rau kab thiab kab mus rau ncoo. Los ntawm kev pom ntau lawm, qhov loj dua qhov zoo dua yog tias ua tau, qhov ntau dua yog 10mil.

2. Pad aperture thiab ncoo dav

Raws li qhov ua tau zoo ntawm cov tuam txhab PCB tseem muaj kev txhawj xeeb, yog tias lub ncoo aperture yog mechanically drilled, qhov tsawg kawg nkaus yuav tsum tsis pub tsawg tshaj 0.2 hli, thiab yog siv laser drilling, qhov tsawg kawg nkaus yuav tsum tsis pub tsawg tshaj 4mil. Lub aperture kam rau ua yog txawv me ntsis nyob ntawm lub phaj, feem ntau nws tuaj yeem tswj tau nyob rau hauv 0.05mm, thiab qhov tsawg kawg nkaus ncoo dav yuav tsum tsis pub tsawg tshaj 0.2mm.

3. Qhov kev ncua deb ntawm lub ncoo thiab lub ncoo

Raws li qhov ua tau zoo ntawm cov tuam txhab PCB tseem muaj kev txhawj xeeb, qhov kev ncua deb ntawm cov ntaub qhwv thiab cov ntaub qhwv yuav tsum tsis pub tsawg dua 0.2 hli.

4. Qhov kev ncua deb ntawm daim tawv nqaij tooj liab thiab ntug ntawm lub rooj tsavxwm

Qhov kev ncua deb ntawm daim tawv nqaij tooj liab thiab ntug ntawm PCB pawg thawj coj saib zoo dua tsis pub tsawg dua 0.3 hli. Teem cov cai sib nrug ntawm nplooj ntawv Tsim-Cov Cai-Board daim duab qhia.

Yog tias nws yog thaj chaw loj ntawm tooj liab, nws feem ntau yuav tsum tau muab tshem tawm ntawm ntug ntawm lub rooj tsavxwm, feem ntau teem rau 20mil. Hauv PCB tsim thiab tsim kev lag luam, nyob rau hauv ib txwm muaj xwm txheej, vim yog kev txiav txim siab ntawm cov khoom siv hluav taws xob ua tiav, los yog kom tsis txhob curling lossis hluav taws xob luv luv vim yog cov tawv nqaij ntawm cov tawv nqaij ntawm ntug ntawm lub rooj tsavxwm, engineers feem ntau kis tooj liab rau. ib cheeb tsam loj Lub thaiv yog shrunk los ntawm 20 mils txheeb ze rau ntawm ntug ntawm lub rooj tsavxwm, es tsis txhob kis tus tooj liab mus rau ntug ntawm lub rooj tsavxwm. Muaj ntau txoj hauv kev los daws qhov zoo li no ntawm tooj liab shrinkage, xws li kos ib txheej khaws cia rau ntawm ntug ntawm lub rooj tsavxwm, thiab tom qab ntawd teeb tsa qhov kev ncua deb ntawm tooj liab paving thiab khaws cia. Ntawm no yog ib txoj hauv kev yooj yim los teeb tsa kev nyab xeeb sib txawv rau cov khoom siv tooj liab paving. Piv txwv li, kev nyab xeeb ntawm tag nrho pawg thawj coj saib yog teem rau 10mil, thiab tooj liab paving yog teem rau 20mil, thiab cov nyhuv ntawm 20mil shrinkage ntawm board ntug yuav ua tau tiav. Cov tooj liab tuag uas yuav tshwm sim hauv lub cuab yeej raug tshem tawm.

2. Tsis yog hluav taws xob kev nyab xeeb clearance
1. Tus cwj pwm dav, qhov siab thiab qhov sib nrug

Cov ntawv zaj duab xis tsis tuaj yeem hloov pauv thaum ua, tab sis tus cwj pwm kab dav ntawm D-CODE tsawg dua 0.22mm (8.66mil) yog thickened rau 0.22mm, uas yog, tus cwj pwm kab dav L = 0.22mm (8.66mil), thiab Tag nrho cov cim Dav = W1.0mm, qhov siab ntawm tag nrho cov cim H = 1.2mm, thiab qhov chaw nruab nrab ntawm cov cim D = 0.2mm. Thaum cov ntawv nyeem me dua li cov qauv saum toj no, kev ua haujlwm thiab luam ntawv yuav plam.

2. Qhov sib nrug ntawm lub qhov thiab ntawm lub qhov (qhov ntug mus rau lub qhov ntug)

Qhov kev ncua deb ntawm vias (VIA) thiab vias (qhov ntug mus rau lub qhov ntug) yog qhov zoo dua ntau dua 8mil.

3. Qhov deb ntawm silk screen mus rau hauv ncoo

Txhob lo lo ntxhuav npo tsis pub npog lub ncoo. Vim hais tias yog cov tshuaj ntsuam txhob lo lo ntxhuav yog npog nrog lub ncoo, lub ntsej muag txhob lo lo ntxhuav yuav tsis tinned thaum lub sij hawm tinning, uas yuav cuam tshuam rau cov khoom mounting. Feem ntau, lub Hoobkas board xav tau qhov chaw ntawm 8mil kom tau tshwj tseg. Yog tias thaj chaw PCB yog qhov txwv tiag tiag, qhov 4mil suab tsis tshua pom zoo. Yog tias lub vijtsam txhob lo lo ntxhuav npog lub ncoo thaum tsim, lub rooj tsavxwm lub Hoobkas yuav tshem tawm ib feem ntawm lub npov txhob lo lo ntxhuav sab laug rau ntawm lub ncoo thaum tsim khoom kom paub meej tias cov ntaub qhwv tinned.

Tau kawg, cov xwm txheej tshwj xeeb raug tshuaj xyuas kom meej thaum lub sijhawm tsim. Qee lub sij hawm lub ntsej muag txhob lo lo ntxhuav txhob txwm nyob ze ntawm lub ncoo, vim hais tias thaum ob lub ncoo nyob ze heev, lub ntsej muag silk hauv nruab nrab tuaj yeem tiv thaiv kev sib txuas ntawm kev sib txuas ntawm luv luv thaum lub sij hawm soldering. Qhov xwm txheej no yog lwm qhov teeb meem.

4. 3D qhov siab thiab kab rov tav qhov sib txawv ntawm cov qauv siv tshuab

Thaum txhim kho cov khoom siv ntawm PCB, xav txog seb puas yuav muaj kev tsis sib haum xeeb nrog lwm cov khoom siv tshuab hauv kab rov tav thiab qhov siab ntawm qhov chaw. Yog li ntawd, thaum tsim, nws yog ib qho tsim nyog yuav tsum tau xav txog tag nrho cov adaptability ntawm lub Cheebtsam, cov khoom PCB thiab cov khoom plhaub, thiab cov qauv ntawm qhov chaw, thiab tseg ib tug nyab xeeb nyob deb ntawm txhua lub hom phiaj los xyuas kom meej tias tsis muaj teeb meem nyob rau hauv qhov chaw.