Inye, intshayelelo

With the emergence of large-scale integrated circuit products, the installation and testing of PCB ibaluleke ngakumbi nangakumbi. The general test of printed circuit board is the traditional test technology of PCB industry.

Itekhnoloji yokuqala yokuvavanywa kombane kwindalo iphela inokulandelwa emva phaya ngasekupheleni kweminyaka yee-1970 nasekuqaleni kweminyaka yee-1980. Ukusukela ukuba izinto ngelo xesha zonke iipakeji ezamkelweyo (i-Pitch 100mil) kunye ne-PCB kuphela zazine-THT (nge-hole-technology technology) kwinqanaba lokuxinana, abavelisi boomatshini baseYurophu nabaseMelika bayila umatshini wovavanyo lwegridi esemgangathweni. Logama nje izinto kunye nokufaka iintambo kwi-PCB zilungelelaniswe ngokomgama oqhelekileyo, indawo nganye yovavanyo iya kuwela kwinqanaba legridi esemgangathweni, kuba yonke iPCBS inokusetyenziswa ngelo xesha, ke ibizwa ngokuba ngumatshini wovavanyo kwindalo iphela.

, Enkosi kuphuhliso lwezinto zobuchwephesha zokupakisha ze-semiconductor ziqala ukuba nephakeji encinci kunye ne-SMT (SMT) encapsulation, uvavanyo oluqhelekileyo lokuxinana oluqhelekileyo alusasebenzi, emva koko phakathi kwiminyaka engamashumi alithoba, thina nabavelisi baseYurophu bazise kabini Ukuvavanywa koxinano lomatshini, kudityaniswa nokusetyenziswa kwethambeka lokudibanisa umatshini othile wokudibanisa umatshini kunye nomdlalo wokuguqula amanqaku ovavanyo lwePCB, Ngokuvuthwa okuthe chu kwenkqubo yokuvelisa ye-HDI, uvavanyo lokuxinana okuphindwe kabini alunako ukuhlangabezana ngokupheleleyo neemfuno zovavanyo, ke malunga no-2000, abavelisi boomatshini bokuvavanya baseYurophu basungule umatshini wokuvavanya ubuninzi begridi.

Okwesibini, itekhnoloji ephambili yovavanyo ngokubanzi

1. Ukutshintsha into

To meet the test requirements of most HDI PCBS, the test area must be large enough, usually with the following standard sizes: I-9.6 × 12.8 (intshi), 16 × 12.8 (intshi), 24 × 19.2 (intshi), kwimeko yokuxinana okuphindwe kabini kwiGridi epheleleyo, amanqaku ovavanyo obu bukhulu bungasentla angama-49512, 81920, 184320, inani le-elektroniki ukuya kuthi ga kumakhulu amawaka, Ukutshintsha into sisiseko sokuqinisekisa uzinzo lovavanyo, kwaye kuyafuneka ukuba uxinzelelo oluphezulu (& GT; 300V), ukuvuza okuphantsi kunye nezinye iipropathi, kunye neempawu zombane ezinje ngexabiso lokumelana kufuneka zilungelelaniswe kwaye zingaguquguquki, ke olu hlobo lwezinto kufuneka zihambe ngokujonga ngokungqongqo kunye nokufumanisa, zihlala zinee-transistors okanye iityhubhu zentsimi njengezinto ezitshintshayo

Advantages and disadvantages of crystal triode:

Izinto eziluncedo: ixabiso eliphantsi, amandla antistatic ukwaphuka, uzinzo oluphezulu;

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

Izinto eziluncedo nezingalunganga ze-FETS:

Izinto eziluncedo: Ukuqhutywa kwevolthi, isekethe elula, engachatshazelwa sisiseko sangoku (i-Ib), ukusetyenziswa kwamandla okuphantsi

Ukungancedi: iindleko eziphezulu, ukuqhekeka kombane ngokulula, kufuneka ukonge amanyathelo okhuseleko ngombane, uzinzo aluphezulu, ke oko kuyonyusa iindleko zokugcina.

2. Independence of grid points

IGridi epheleleyo

Igridi nganye ine-loop yokutshintsha ezimeleyo, oko kukuthi, inqaku ngalinye lihlala kwiqela lezinto ezitshintshayo kunye nemigca, indawo yovavanyo iphela ingaliphinda-phinda kane uxinano lwenaliti.

Yabelana ngeGridi

Ngenxa yenani elikhulu lokutshintsha kwezinto kwiGridi epheleleyo kunye nobunzima besekethe, kunzima ukukuqonda, ke abanye abavelisi bovavanyo basebenzisa itekhnoloji yokwabelana ngeGridi ukwenza amanqaku aliqela kwiindawo ezahlukeneyo Yabelana ngeqela lezinto ezitshintshayo kunye neesekethe, ukuze ukunciphisa ubunzima bezintambo kunye nenani lezinto ezitshintshayo, ezibizwa ngokuba Yabelana ngeGridi. Esinye seziphene ezinkulu zegridi ekwabelwana ngazo kukuba ukuba amanqaku kwindawo ahlaliswe ngokupheleleyo, amanqaku kwindawo ekwabelwana ngayo ayisenakusetyenziswa, ke oko kunciphisa uxinano lwendawo kubungakanani obunye. Ke ngoko, kusekho indawo yokuxinana kuvavanyo lwe-HDI kwindawo enkulu.

3. Ukwakhiwa kwesakhiwo

Ukwakhiwa kweemodyuli

Lonke uluhlu lokutshintsha, iindawo zokuqhuba kunye nezinto zolawulo zidityaniswe kakhulu kuseto lweemodyuli zekhadi lokutshintsha, indawo yovavanyo inokudityaniswa ngokukhululekileyo yimodyuli, kwaye inokutshintshana, inqanaba lokungaphumeleli, ulondolozo olulula kunye nokuphucula, kodwa iindleko eziphezulu.

Isakhiwo senxeba

Umnatha uqulunqwe ngenaliti yasentwasahlobo kunye nekhadi lokutshintsha, elinomthamo omkhulu kwaye akukho ndawo yokuphucula, kwaye kunzima ukuyigcina kwimeko yokusilela.

4. Ulwakhiwo lwemidlalo

Isakhiwo senaliti ende

Ngokubanzi ibhekisa kwinaliti yentsimbi ngu-3.75 ″ (95.25mm) yesakhiwo se-fixture, ithuba lokuthambeka kwenaliti enkulu, indawo yeyunithi inokuchithwa amanqaku eenaliti kunesakhiwo senaliti esifutshane ngaphezulu kwe-20% ~ 30%. Kodwa amandla olwakhiwo ahlelelekile, imveliso yemidlalo kufuneka ithathele ingqalelo ukomeleza.

Isakhiwo senaliti emfutshane

Ngokubanzi ibhekisa kwinaliti yentsimbi ngu-2.0 ″ (50.8mm) isakhiwo somdlalo, uncedo lwamandla olungileyo alungile, kodwa ithambeka lenaliti lincinci.

5. Isoftware encedisayo (CAM)

Inkxaso eyiyo ye-CAM ibalulekile kuvavanyo olunoxinano oluphezulu kwaye inezinto ezimbini eziphambili:

Uhlalutyo lwenethiwekhi kunye nokuveliswa kwenqaku lovavanyo;

Imveliso yomncedisi wemidlalo.

Ngenxa yesiphumo semveliso yenkqubo yeeparitha ezininzi (ezinje ngesakhiwo somaleko, umngxuma wokuvula, umgama womngxunya wokhuseleko, ubume bentsika, njl.njl. Rhoqo isishwankathelo samava, ukwenzela ukwenza umdlalo olungcono.

Three, double density and four density comparison

Okokuqala, sinokugqiba ubuninzi bebhodi yokuxinana ephindwe kabini ayinakuvavanya, intwasahlobo ebhedini kuba inaliti ye-lattice density kunye nokuxinana kwendawo yovavanyo kulungelelwaniso lovavanyo lwe-PCB yentsimbi eyahlukeneyo kufuneka ibenethambeka elithile, vula igridi onakho ngaphandle kwigridi, isinyithi seAngle, nangona kunjalo, sinqunyelwe kwisakhiwo, asinakuba ngaphezulu, Ngokubanzi, iinaliti zensimbi ezixineneyo

Ithambeka (umgama othe tye wenaliti yentsimbi kulungelelwaniso) ukuya kuthi ga kwi-700mil, kwaye uxinano olune-400mil. Emva koko, kunokwenzeka ukuvelisa into yokungakwazi ukutyala inaliti, zingaphi iinaliti ezinjalo ezinokubalwa.

Ukongeza, ngokucacileyo kunokuphucula uvavanyo kwiziphumo zovavanyo lwenqanaba lobuxoki kunye nokuqhekeka, ubungakanani be-lattice yobunzima nge-intshi nganye yesikwere amanqaku angama-400, uxinano oluphindwe kabini kumanqaku angama-200, amanqaku afanayo kulungelelwaniso olusezantsi kunye nendawo yenaliti inokunciphisa isiqingatha, ke, ukusebenzisa uxinano olunokunciphisa intsimbi ye-Angle, indawo ephantsi kobude obufanayo, Ithambeka elifanayo kunye nenaliti yokuvavanywa kwepleyiti yokulinganisa ubukhulu becala sisiqingatha soxinano oluphindwe kabini, inaliti yentsimbi ye-Angle inefuthe elikhulu kuvavanyo, ithambeka umgama othe nkqo uyancitshiswa, uxinzelelo lwentwasahlobo lwentwasahlobo luya kuncipha, kunye nolungelelwaniso ngalunye intsimbi kwicala elime nkqo lokunyuka kokunganyangeki, khokelela kwisinyithi esibi ngaphambi kokudibana nePAD. Ukongeza, kwinkqubo yokubumba nokuhla, ukuphela kwenaliti yentsimbi ethambekileyo ekunxibelelaneni ne-PCB kuya kuba nesilayidi esihambelana nomphezulu wePAD. Ukuba amandla womdlalo awulunganga kwaye ukhubazekile, inaliti yentsimbi iya kubambeka kulungelelwaniso. Ngeli xesha, uxinzelelo lwenaliti yentsimbi kwi-PAD iya kuba ngaphezulu kakhulu kunamandla e-elastic yenaliti yebhedi yenaliti yasentwasahlobo, eya kuthi ibangele ukuqaqanjelwa kwiimeko ezinzima. Ukuthambeka kwenaliti yensimbi yentsimbi encinci kuncinci kunoxinano oluphindwe kabini, kukho indawo ethe kratya yokufaka iikholamu zenkxaso kulungelelwaniso, ukuze ulwakhiwo luzinze. Olunye uncedo lwethambeka elincinci kukuba kunciphisa ubungakanani bemingxunya, oko ke kunciphisa ukubakho kokuqhekeka kwemingxunya.

Kwi-BGA enesithuba se-PAD se-20mil ngokulinganayo esasaziweyo, ithambeka eliphezulu lokusasazeka kwenaliti ngama-600mil kuvavanyo loxinano oluphindwe kabini kunye ne-400mil yovavanyo lokuxinana. Inani lamanqaku anokucwangciswa ngovavanyo lokuxinana kabini ngu-441, malunga ne-0.17inch2, kunye ne-896, malunga ne-0.35inch2, ngokwahlukeneyo. Ubungqongqo obuphindwe kabini, ukusuka kwindawo.