Far dahab ah
Ulaha xusuusta kumbuyuutarka iyo kaararka garaafyada, waxaan ku arki karnaa xiriiro xiriiriye oo dahab ah oo safan, kuwaas oo loo yaqaan "faraha dahabka ah". Farta Dahabka ah (ama Xidhiidhiyaha Edge) ee naqshadaynta PCB-ga iyo warshadaha wax-soo-saarka waxay u isticmaashaa isku-xidhaha isku-xidhaha sidii meel bannaan oo loogu talagalay guddiga inay ku xidhmaan shabakadda. Marka xigta, aan fahamno sida loola macaamilo faraha dahabka ee PCB iyo faahfaahinta qaarkood.
Habka daaweynta dusha sare ee farta dahabka PCB
1. Electroplating nikkel dahab: dhumucdiisuna ilaa 3-50u”, sababta oo ah ay conductivity ka sarreeya, oxidation iska caabin ah iyo xidhashada caabbinta, waxaa si weyn loo isticmaalaa in PCBs far dahab ah oo u baahan gelinta iyo ka saarida soo noqnoqda ama PCB loox oo u baahan khilaaf farsamo soo noqnoqda Korka, laakiin sababtoo ah qiimaha sare ee dahabka dahabiga ah, waxaa loo isticmaalaa oo kaliya qayb dahab ah oo dahab ah sida faraha dahabka ah.
2. Dahab Immersion: Dhumucdiisuna waa 1u caadiga ah ", ilaa 3u" sababta oo ah conductivity ka sarreeya, flatness iyo solderability, waxaa si ballaaran loo isticmaalo in loox PCB-sax-sare leh boosaska button, bonded IC, BGA, iwm. Shuruudaha iska caabbinta xirashada hooseeya waxay sidoo kale dooran kartaa habka dahabka immersion guddiga oo dhan. Qiimaha habka dahabka ee immersion ayaa aad uga hooseeya kan habka elektro-dahabka. Midabka Immersion Gold waa huruud dahabi ah.
Farsamaynta tafaasiisha faraha dahabiga ah ee PCB
1) Si loo kordhiyo caabbinta xirashada faraha dahabiga ah, faraha dahabiga ah sida caadiga ah waxay u baahan yihiin in lagu dhejiyo dahab adag.
2) Faraha dahabka ah waxay u baahan yihiin in la gooyo, badanaa 45 °, xaglaha kale sida 20 °, 30 °, iwm. Haddii aysan jirin chamfer naqshadeynta, waxaa jira dhibaato; 45° chamfer-ka PCB-ga ayaa lagu muujiyay sawirka hoose:
3) Farta dahabka ah waxay u baahan tahay in loola dhaqmo sidii gabal gabal oo maaskaro ah si loo furo daaqada, iyo PIN uma baahna inuu furo mesh birta;
4) Daasadda immersion iyo suufka immersion ee qalin waxay u baahan yihiin inay ahaadaan masaafo ugu yaraan 14mil ah xagga sare ee farta; waxaa lagu talinayaa in suufku uu ka fog yahay 1mm farta inta lagu jiro naqshadeynta, oo ay ku jiraan suufka;
5) Ha ku faafin naxaasta dusha farta dahabka ah;
6) Dhammaan lakabyada lakabka gudaha ee farta dahabka ah waxay u baahan yihiin in la gooyo naxaas, badiyaa ballaca naxaasta la gooyey waa 3mm ka weyn; waxa loo isticmaali karaa naxaasta farta badhkeed laga jaray iyo naxaasta farta oo dhan laga jaray.
"dahabka" faraha dahabiga ah ma dahabbaa?
Marka hore, aynu fahamno laba fikradood: dahab jilicsan iyo dahab adag. Dahab jilicsan, guud ahaan dahab jilicsan. Dahab adag guud ahaan waa isku dhafka dahabka adag.
Shaqada ugu weyn ee farta dahabiga ah waa in la isku xiro, markaa waa in ay leedahay koronto wanaagsan oo koronto ah, xirto caabbinta, caabbinta oksaydhka iyo iska caabinta daxalka.
Sababtoo ah qaabka dahabka saafiga ah (dahab) waa mid jilicsan, faraha dahabiga ah guud ahaan ma isticmaalaan dahab, laakiin kaliya lakabka "dahab adag (dahab dahab ah)" ayaa lagu dhejiyay, taas oo aan heli karin oo kaliya tayada wanaagsan ee dahabka, laakiin sidoo kale waxay ka dhigtaa mid u adkaysta waxqabadka abrasion iyo iska caabinta oksaydhka.
Markaa PCB miyay isticmaashay "dahab jilicsan"? Jawaabtu waa dabcan waxaa jira adeegsi, sida dusha xiriirka ee badhanka taleefannada gacanta, COB (Chip On Board) oo leh silig aluminium ah iyo wixii la mid ah. Isticmaalka dahabka jilicsan guud ahaan waa in lagu shubo dahabka nikkel ee guddiga wareegga iyadoo la isticmaalayo koronto, iyo xakamaynta dhumucdeedu waa mid dabacsan.