Ib, kev taw qhia

Nrog rau qhov tshwm sim ntawm cov khoom lag luam loj sib xyaw ua ke, kev teeb tsa thiab ntsuas ntawm PCB tau dhau los ua qhov tseem ceeb dua. The general test of printed circuit board is the traditional test technology of PCB industry.

Lub tshuab ntsuas hluav taws xob thoob ntiaj teb ntxov tshaj plaws tuaj yeem taug qab mus rau xyoo 1970s thiab thaum ntxov 1980s. Txij li cov khoom siv nyob rau lub sijhawm ntawd txhua tus tau txais cov qauv txheej txheem (Suab 100mil) thiab PCB tsuas yog muaj THT (dhau los-qhov thev naus laus zis) qib ntom ntom ntom ntom, European thiab Asmeskas cov tshuab kuaj tshuab tsim cov tshuab ntsuas kab qauv. Tsuav ntev li cov khoom sib txuas thiab txuas rau ntawm PCB tau teeb tsa raws li tus qauv nyob deb, txhua qhov kev ntsuas yuav poob ntawm tus qauv kab sib chaws, vim tias txhua lub PCBS tuaj yeem siv tau nyob rau lub sijhawm ntawd, yog li nws hu ua lub tshuab ntsuas thoob ntiaj teb.

, ua tsaug rau kev txhim kho cov khoom ntim khoom ntim khoom siv hluav taws xob pib ua kom muaj pob me dua thiab SMT (SMT) kev ntim khoom, thoob ntiaj teb kev ntsuas tus qauv ntom pib tsis siv ntxiv lawm, tom qab ntawd nyob hauv nruab nrab – cuaj caum -s, peb thiab European cov tuam txhab kuj tau qhia ob zaug lub tshuab ntsuas ntom ntom ntom ntom, suav nrog kev siv qee yam nqes hlau tsim kab sib chaws tshuab thiab teeb tsa los hloov PCB cov ntsiab lus ntsuas, Nrog rau qhov ua tiav zuj zus ntawm HDI cov txheej txheem tsim khoom, ob npaug kev ntsuas thoob ntiaj teb tsis tuaj yeem ua tiav raws li qhov xav tau ntawm kev sim, yog li ib puag ncig 2000, Cov European kuaj tshuab tshuab tuam txhab tsim plaub-ntom ntom daim phiaj thoob ntiaj teb ntsuas tshuab.

Qhov thib ob, cov cuab yeej tseem ceeb ntawm kev sim dav dav

1. Hloov lub caij

To meet the test requirements of most HDI PCBS, the test area must be large enough, usually with the following standard sizes: 9.6 × 12.8 (nti), 16 × 12.8 (nti), 24 × 19.2 (nti), hauv qhov xwm txheej ntawm ob qhov ntom ntom Full Grid, cov ntsiab lus ntsuas ntawm peb qhov ntau thiab tsawg yog 49512, 81920, 184320, tus lej hluav taws xob Cheebtsam yog txog ntau pua txhiab, Kev hloov pauv lub hauv paus yog lub hauv paus tseem ceeb txhawm rau ua kom muaj kev ruaj ntseg ntawm qhov ntsuas, thiab nws yuav tsum muaj kev tiv thaiv siab (& GT; 300V), qis qis thiab lwm yam khoom, thiab cov khoom siv hluav taws xob xws li tus nqi tiv thaiv yuav tsum sib npaug thiab zoo ib yam, yog li cov khoom siv no yuav tsum dhau los tshuaj xyuas nruj thiab kuaj pom, feem ntau nrog cov transistors lossis cov raj muaj txiaj ntsig raws li hloov pauv

Advantages and disadvantages of crystal triode:

Qhov zoo: tus nqi qis, muaj peev xwm ua kom muaj zog tiv thaiv kev puas tsuaj, ruaj khov;

Disadvantages: current drive, complex circuit, need to isolate base current (Ib) influence, high power consumption

Qhov zoo thiab qhov tsis zoo ntawm FETS:

Qhov zoo: qhov hluav taws xob uas tau tsav, kev siv hluav taws xob yooj yim, tsis cuam tshuam los ntawm qhov pib tam sim no (Ib), kev siv hluav taws xob tsawg

Qhov tsis zoo: tus nqi siab, hluav taws xob hluav taws xob tawg yooj yim, xav tau ntxiv kev tiv thaiv kev tiv thaiv hluav taws xob, kev ruaj ntseg tsis siab, yog li nws yuav nce tus nqi saib xyuas.

2. Independence of grid points

Daim phiaj puv

Txhua daim phiaj muaj kev ywj pheej hloov lub voj, uas yog, txhua lub ntsiab lus nyob hauv pab pawg hloov pauv cov kab thiab kab, tag nrho thaj chaw ntsuas tuaj yeem yog plaub zaug qhov ntom ntawm rab koob.

Qhia daim phiaj

Vim tias muaj cov lej hloov pauv ntau nyob rau hauv Daim phiaj puv thiab qhov nyuaj ntawm lub Circuit Court, nws nyuaj rau paub, yog li qee qhov kev sim cov tuam txhab siv Grid sib qhia thev naus laus zis los ua ob peb lub ntsiab lus hauv ntau qhov chaw sib qhia ib pawg ntawm cov khoom sib hloov thiab cov khoom siv, yog li txhawm rau txo qhov nyuaj ntawm cov xov hlau thiab cov lej ntawm cov khoom sib hloov, uas yog hu ua Sib Koom. Ib qho ntawm qhov tsis xws luag ntawm kev sib koom ua ke yog tias yog cov ntsiab lus hauv ib cheeb tsam tau ua tiav, cov ntsiab lus hauv thaj chaw sib koom tsis tuaj yeem siv tau ntxiv, yog li txo qhov ntom ntawm cheeb tsam mus rau qhov sib npaug. Yog li ntawd, tseem muaj qhov txwv qhov txwv hauv qhov ntsuas HDI hauv thaj chaw loj.

3. Cov qauv sib xyaw

Modular kev tsim kho

Txhua qhov hloov pauv, qhov chaw tsav tsheb thiab cov khoom tswj hwm tau sib xyaw ua ke rau hauv cov txheej txheem hloov pauv daim npav, thaj chaw xeem tuaj yeem sib xyaw ua ke los ntawm tus qauv, thiab tuaj yeem hloov pauv tau, tus nqi tsis ua tiav, kev saib xyuas yooj yim thiab txhim kho, tab sis tus nqi siab.

Cov qauv mob

Cov ntxaij yog tsim los ntawm lub caij nplooj ntoo hlav caij nplooj ntoo hlav thiab daim npav sib cais, uas muaj ntim loj thiab tsis muaj chaw rau kho dua tshiab, thiab nyuaj rau kev tswj xyuas thaum ua tsis tiav.

4. Cov qauv ntawm cov khoom siv

Ntev rab koob teeb tsa

Feem ntau hais txog rab koob hlau yog 3.75 ″ (95.25mm) ntawm cov qauv teeb tsa, qhov kom zoo dua ntawm txoj kab nqes loj, thaj tsam hauv cheeb tsam tuaj yeem tawg cov ntsiab lus koob ntau dua li rab koob luv qauv ntau dua 20%~ 30%. Tab sis cov txheej txheem lub zog tsis zoo, kev tsim khoom tsim khoom yuav tsum tau ua tib zoo txhawm rau ntxiv dag zog.

Cov qauv siv rab koob luv

Feem ntau hais txog rab koob hlau yog 2.0 ″ (50.8mm) cov qauv teeb tsa, qhov kom zoo dua ntawm cov yam ntxwv muaj zog yog qhov zoo, tab sis txoj kab nqes ntawm rab koob me me.

5. Pab cuam software (CAM)

Kev txhawb nqa CAM kom raug yog qhov tseem ceeb hauv kev ntsuas dav dav thiab muaj ob lub hauv paus tseem ceeb:

Kev tshuaj xyuas lub network thiab ntsuas cov cim taw qhia;

Kev tsim khoom pab tsim khoom.

Raws li cov txheej txheem tsim khoom ntawm ntau yam tsis xws li (txheej txheej txheej txheej, lub qhov taub, qhov kev nyab xeeb nyob deb, tus ncej txheem, thiab lwm yam) tau cuam tshuam loj heev rau kev teeb tsa kev teeb tsa kev ua haujlwm, ntu no yuav tsum tau muab los ntawm cov kws tsim khoom tsim txuj ci kev cob qhia, thiab tas li suav cov kev paub dhau los, txhawm rau ua kom lub teeb pom kev zoo dua.

Peb, sib npaug sib npaug thiab plaub qhov sib piv sib piv

Ua ntej, peb tuaj yeem ua tiav plaub qhov ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntwm tsis tuaj yeem ntsuas, lub caij nplooj ntoo hlav ntawm lub txaj vim tias rab koob ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntawm qhov ntsuas ntawm PCB kev sib tw rau cov hlau sib txawv yuav tsum muaj qee qhov nqes hav, tig rau kab sib chaws koj tuaj yeem ua tau yuav tawm ntawm kab sib chaws, Lub kaum ntse ntse hlau yog, txawm li cas los xij, txwv los ntawm cov qauv, tsis tuaj yeem muaj ntau ntxiv, Feem ntau, ob npaug – ntom steel koob

Qhov nqes hav (kab rov tav offset deb ntawm cov hlau koob hauv lub teeb) yog mus txog 700mil, thiab plaub-ntom yog 400mil. Tom qab ntawd, nws muaj peev xwm tsim qhov tshwm sim tsis tuaj yeem cog cov koob, pes tsawg tus koob tuaj yeem suav tau.

Ib qho ntxiv, tuaj yeem pom tseeb txhim kho kev ntsuas hauv qhov ntsuas ntawm qhov tsis raug thiab tsim, plaub qhov sib npaug sib npaug ntawm ib square inch 400 cov ntsiab lus, ntom ntom ob npaug ntawm 200 cov ntsiab lus, cov ntsiab lus zoo ib yam nyob hauv qab thiab rab koob cheeb tsam tuaj yeem txo qis ib nrab, yog li, siv plaub qhov ntom ntom tuaj yeem txo qis Lub kaum ntse ntse hlau, cov khoom sib dhos hauv qhov xwm txheej ntawm qhov siab tib yam, Tib txoj kab nqes thiab rab koob plaub qhov ntsuas ntsuas yog ib nrab ntawm ob qhov ntom ntom ntom ntom ntom, Lub kaum ntse ntse hlau rab koob tuaj yeem ua rau muaj kev cuam tshuam loj ntawm kev ntsuas, txoj kab nqes yog ntsug nrug tau raug txo qis, lub caij nplooj ntoo hlav siab yuav txo qis, thiab teeb tsa hauv txhua txheej ntawm hlau nyob rau hauv txoj kev taw qhia ntawm kev tiv thaiv nce, ua rau cov hlau tsis zoo ua ntej kev sib cuag nrog PAD. Ib qho ntxiv, hauv cov txheej txheem ntawm kev nce thiab nqis moulding, qhov kawg ntawm cov hlau uas muaj ntxig nyob rau hauv kev sib cuag nrog THE PCB yuav muaj tus txheeb ze swb ntawm PAD nto. Yog tias lub zog ntawm lub teeb tsis zoo thiab tsis zoo, cov hlau yuav raug daig hauv cov khoom siv. Lub sijhawm no, lub zog ntawm rab koob hlau ntawm PAD yuav nyob deb ntau dua li lub zog siv zog ntawm lub txaj txaj lub caij nplooj ntoo hlav, uas yuav ua rau nkag mus rau qhov xwm txheej loj. Plaub-ntom hlau txoj kab nqes hav me dua ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntaws plaub me ntsis ntawm plaub lub taub, cov kab ua kom muaj zog tuaj yeem txhim kho kom ruaj khov. Lwm qhov zoo ntawm qhov nqes hav me dua yog tias nws txo qhov loj me, yog li txo qhov ua tau ntawm qhov tawg.

Txog BGA nrog PAD qhov sib nrug ntawm 20mil tusyees faib, qhov siab tshaj plaws ntawm rab koob tawg yog 600mil rau ntsuas qhov ntsuas ob zaug thiab 400mil rau plaub qhov ntsuas ntsuas. Tus naj npawb ntawm cov ntsiab lus uas tuaj yeem npaj los ntawm kev ntsuas ob zaug yog 441, txog 0.17inch2, thiab 896, txog 0.35inch2, feem. Nws yog qhov tseem ceeb ob npaug, los ntawm qhov chaw.