Ukubaluleka Kwemaski Yokusongelwa Kwe-PCB: Izinhlobo, Izinto Zokusebenza kanye Nokucatshangelwa Komklamo

Imaski yokubopha ye-PCB ingaphezu nje kokumbozwa okuvikelayo: ilawula ingozi yokubopha i-solder, ukushiswa kwethusi, isikhala sokufakwa kokushisa, umehluko wombala, ikhwalithi yokuhlanganiswa, kanye nokuthembeka kwebhodi lesikhathi eside. I-Highleap Electronics ibuyekeza uhlobo lwemaski yokubopha, ububanzi bedamu, ukubekezelelana kokuvula, ukuhambisana kokuphela kwendawo, izidingo zebhodi eziguquguqukayo noma eziqinile, kanye nezinqubo zokuhlola ngaphambi kokukhiqizwa; imininingwane ehlobene imbozwe ekwakhiweni kwedamu lemaski yokubopha kanye nokukhetha kokuphela kwendawo ye-PCB.

Iyini i-PCB Soldermask?

I-PCB soldermask, eyaziwa nangokuthi ukumelana ne-solder noma i-solder stop, iyingxenye ebalulekile yama-PCB. Iwungqimba oluncane, oluvikelayo lwe-polymer material olusetshenziswa ebusweni be-PCB, lusebenza njengesithiyo ngokumelene nezakhi ezihlukahlukene, njengomswakama, uthuli, kanye ne-oxidation. Umsebenzi oyinhloko we-soldermask ukuvimbela amabhuloho e-solder ekubunjweni ngesikhathi senqubo yokudayiswa, okungase kuholele emijikelezweni emifushane futhi kuthinte ukusebenza okuphelele kwedivayisi ye-elekthronikhi.

Imaski ye-solder isebenza njengesivikelo esiyinhloko ekugqwaleni nasekungcoleni kwama-PCB akho. Ngokunciphisa ukuwohloka kokusebenza kanye nokunciphisa isikhathi sokusebenza kwe-elekthronikhi, inomthelela ekhwalithini ye-PCB. Okubaluleke kakhulu, imaski ye-solder ivimbela ukukhiqizwa kwamabhuloho e-solder ngokwenza isithiyo ngesikhathi sokuhlangana phakathi kwamalunga ahlanganisiwe nezinye izingxenye eziqhubayo ze-PCB. Amamaski e-solder ayivelakancane kumasekethe enziwe ngezandla, kodwa ahlala ebonakala kuma-PCB akhiwe ngobuningi futhi ahlanganiswa kusetshenziswa imishini efana namabhati e-solder. Imaski ye-solder iyingqimba ye-PCB ehlukile ekukhiqizweni kwe-PCB, njengezingqimba zethusi nezesikrini se-silk.

Izinhlobo PCB Soldermask Materials

Izinto ezisetshenziswa kumamaski e-Solder zidlala indima ebalulekile ekusebenzeni okuphelele nasekuthembekeni kwe-PCB. Izinhlobo eziningana ze-soldermask materials ziyatholakala, ngayinye inezici zayo eziyingqayizivele.

I-Epoxy Liquid

I-Epoxy liquid soldermask ingenye yezinto ezivame kakhulu futhi ezisetshenziswa kakhulu ze-soldermask embonini ye-PCB. Iqukethe isistimu yezingxenye ezimbili, ngokuvamile ehlanganisa i-epoxy resin kanye ne-hardener. Uma zixutshwe ndawonye, ​​zakha uketshezi olungasetshenziswa ebusweni be-PCB.

Izinzuzo eziyinhloko ze-epoxy liquid soldermask ukunamathela kwayo okuhle kakhulu, ukumelana okuhle kwamakhemikhali, kanye nokusebenza kahle kwezindleko. Ngaphezu kwalokho, i-epoxy liquid inikeza indawo ebushelelezi, efanayo, efanelekela izingxenye ezincane kanye nemiklamo ye-PCB eyinkimbinkimbi.

Ifilimu Eyomile

I-soldermask yefilimu eyomile i-pre-laminated, i-photoimageable material etholakala kumashidi noma imiqulu. Iqukethe ungqimba oluncane lwe-polymer e-photoactive, ehlanganiswe phakathi kwefilimu ye-polyester evikelayo kanye nomugqa wokukhulula. Ifilimu eyomile isetshenziswa endaweni ye-PCB isebenzisa inqubo ye-lamination, enamathela ungqimba lwe-photoactive ebhodini.

Izinzuzo ze-soldermask yefilimu eyomile zihlanganisa ukubhaliswa okunembile nokuqondanisa, ukulungiswa okuhle kakhulu kwezingxenye ze-fine-pitch, kanye nokunciphisa ingozi yokungcola ngesikhathi sokufaka isicelo. Kodwa-ke, i-soldermask yefilimu eyomile ingaba ebiza kakhulu futhi ingaguquki kancane uma iqhathaniswa ne-epoxy liquid, iyenze ingafaneleki kakhulu izinhlelo zokusebenza ezithile kanye nemiklamo ye-PCB.

I-Liquid Photoimageable Soldermask (LPSM)

Ama-soldermasks aphezulu asebenzisa inqubo ye-photolithography, efana naleyo esetshenziselwa ukuchayeka kwe-photoresist ekwenziweni kwe-semiconductor, ngefilimu eyomile noma i-soldermask ewuketshezi. Indlela yokonga kakhulu ye-LPSM ukuyifafaza phezu kwebhodi noma ukuyifaka njenge-epoxy. Nokho, kukhona indlela esebenzisa i-lithography ukuchaza ukuvuleka kwe-soldermask yamaphedi, i-vias, kanye nezimbobo ezinembe kakhudlwana.

Ngendlela ye-LPSM, kufanele uguqule amafayela akho e-Gerber abe imaski yezithombe ngokuhambisana ne-soldermask oyikhethile. Ukuze ususe uthuli ku-soldermask oye waba lukhuni, kufanele futhi uhlanze kahle ibhodi le-panelization. Futhi, sebenzisa i-LPSM ewuketshezi ukuze ugqoke ngokuphelele amaphaneli akho.

Ama-PCB kufanele omiswe kuhhavini ngemva kokumbozwa ngamaphaneli ngaphambi kokufakwa kunjiniyela we-UV. Futhi, ngaphambi kokukhanyisa ukukhanya kwe-UV ku-PCB eyomile, qondanisa imaski yezithombe phezu kwayo. Ukukhanya kwe-UV kusetshenziselwa ukwelapha izinto eziveziwe ze-LPSM kuyilapho i-solvent isetshenziselwa ukususa izindawo ezimboziwe ukwenza isendlalelo esiqinile se-soldermask.

PCB Soldermask Isicelo Techniques

Amasu ahlukahlukene asetshenziswa embonini ye-PCB ukusebenzisa i-soldermask, ngayinye inezinzuzo zayo kanye nokubi. Ukukhethwa kwesu lesicelo se-soldermask kuncike ezintweni ezifana nomklamo we-PCB, umthamo wokukhiqiza, kanye nezidingo ezithile. Nazi ezinye izindlela ezivamile zokusebenzisa i-soldermask:

Ukuphrinta kwesikrini

Enqubweni yokuphrinta isikrini, i-inki kanye ne-solder paste kudluliselwa kusetshenziswa ithuluzi, njenge-mesh noma i-stencil, endaweni ye-PCB noma kuma- PCB vias nama-microvias. Kuyindlela engabizi futhi elula efanelekela ukwenziwa kokukhiqiza okuncane kuya kokuphakathi. Kodwa-ke, kungenzeka inganikezi izinga elifanayo lokunemba kanye nesisombululo sezingxenye ze-fine-pitch kanye nemiklamo ye-PCB enobuningi obukhulu.

I-Curtain Coating

Ukufakwa kwamakhethini sekudume kakhulu njengoba ama-PCB esekhule axaka kakhulu ngokuba nokuminyana kwethrekhi okuphezulu kanye nobubanzi bethrekhi obuncane. I-PCB imbozwe nge-liquid photoimageable (LPI) kusetshenziswa inqubo yejazi lekhethini njengoba idlula eshidini likayinki we-viscosity ephansi eliwela embotsheni encane. Le nqubo inciphisa ukulahleka kwempahla ye-soldermask futhi ingasebenzisa izinto ngesivinini esikhulu kakhulu. Kodwa-ke, kungaholela "ekuthunzeni," kubangele ukuhlukahluka kokuqina kokunamathela.

I-Spray Coating

Ukufakwa kwesifutho kuhilela ukusetshenziswa kwesibhamu sokufutha noma umlomo wombhobho ukusabalalisa impahla ye-soldermask ngokulinganayo endaweni yonke ye-PCB. Inikeza ukulawula okunembile kuhlelo lokusebenza lwe-soldermask, iyenze ifaneleke ama-PCB anomumo ongajwayelekile noma imiklamo eyinkimbinkimbi. Ibanga elifanele le-nozzle, iphethini yesifutho, kanye ne-viscosity yezinto ezibonakalayo kubalulekile ekusebenzeni okulinganayo.

I-Electrostatic Spray Coating

I-electrostatic spray coating iyindlela ekhethekile ekhokhisa impahla ye-soldermask ngensimu kagesi. Izinto ezikhokhiswayo zikhangwa ezindaweni eziphansi zebhodi, zenza umfaniswano kanye ne-coating enembile. Le nqubo ihlinzeka ngokunemba okuhle kakhulu kanye nokuhlanganisa, iyenze ifaneleke ama-PCB anabantu abaningi. Nokho, kungase kubize kakhulu futhi kudinga imishini ekhethekile.

Inqubo ngayinye yesicelo se-soldermask inezinzuzo zayo eziyingqayizivele kanye nemikhawulo, okwenza kube semqoka ukukhetha indlela efaneleke kakhulu yezidingo zakho zephrojekthi ye-PCB ethile. Ngokuqonda amakhono kanye nokuhwebelana kwesu ngalinye, ungenza izinqumo ezinolwazi eziqinisekisa ikhwalithi ephezulu nokusebenza kwemaski yakho ye-PCB solder.

PCB Soldermask Design Ukucatshangelwa

Ukuklama i-PCB kuhilela izici eziningi ezibucayi, futhi i-soldermask idlala indima ebalulekile ekuqinisekiseni ukusebenza kahle nokuthembeka komkhiqizo wokugcina. Lapho uhlanganisa i-soldermask ekwakhiweni kwakho kwe-PCB, kubalulekile ukucabangela izici ezimbalwa, njengokukhethwa kwempahla, ukujiya, ukubekezelelana, kanye nezidingo zokugunyazwa. Nazi ezinye izinto ezibalulekile zokucatshangelwa kwedizayini:

Ukukhetha Izinto

Khetha impahla ye-soldermask esekelwe ezintweni ezifana nokuzinza kwe-thermal, ukumelana namakhemikhali, ukuguquguquka, nokufakwa kukagesi. Linganisa imvelo yokusebenza ye-PCB yakho kanye nezidingo ukuze ukhethe izinto ezifanele kakhulu. Xhumana nomkhiqizi wakho we-PCB ukuze uqonde izinketho zempahla ye-soldermask etholakalayo kanye nokuhambisana kwazo nomklamo wakho othize.

Ubukhulu be-Soldermask

Ugqinsi lwesendlalelo se-soldermask lungathinta ukusebenza okuphelele kwe-PCB. Landela imihlahlandlela ye-IPC yezincomo zokujiya kwe-soldermask. Xhumana nomkhiqizi wakho we-PCB ukuze uthole ukujiya kwe-soldermask okufinyelelekayo komklamo wakho kanye nenqubo yokukhiqiza.

Ukubekezelelana kanye Nokubhaliswa

Ukubekezelelwa kwe-Soldermask nokubhaliswa kudlala indima ebalulekile ekuqondaneni okunembile kwesendlalelo se-soldermask neminonjana yethusi namaphedi. Sebenzisa imithetho efanelekile yokuklama i-soldermask nokubekezelela okusekelwe kumakhono omkhiqizi wakho we-PCB. Faka amamaki e-fiducial noma izici zokuqondanisa kumklamo wakho we-PCB ukuze kube lula ukubhaliswa kwe-soldermask okunembile ngesikhathi sokukhiqiza.

I-Soldermask Clearances kanye Nokuvula

Chaza ukucaciswa kwe-soldermask nokuvuleka okusekelwe kumasayizi wengxenye yephedi, izidingo ze-soldering, nokubekezelelana kokukhiqiza. Faka phakathi ukuvuleka okwengeziwe kwamaphoyinti okuhlola, amamaki e-fiducial, noma ezinye izidingo zokusebenza njengoba kudingeka.

Ngokucabangela ngokucophelela lezi zici zokuklama kwe-soldermask, ungakwazi ukuthuthukisa idizayini yakho ye-PCB ukuze usebenze, ukwethembeka, kanye nokwenziwa. Ukusebenzisana eduze nomkhiqizi wakho we-PCB nokuqonda amakhono abo nemikhawulo kuzokusiza wenze izinqumo ezinolwazi kuyo yonke inqubo yokuklama, ekugcineni kuphumele kumkhiqizo wokugcina wekhwalithi ephezulu.

Ukuhlolwa kwe-PCB Soldermask kanye nokulawulwa kwekhwalithi

Ukuqinisekisa ikhwalithi nokuvumelana kwesendlalelo se-soldermask ku-PCB kubalulekile ekusebenzeni nokuthembeka kwebhodi. Ukufeza lokhu, kubalulekile ukusebenzisa izinyathelo ezifanele zokuhlola kanye nokulawula izinga ngesikhathi sokukhiqiza. Nazi ezinye izici ezibalulekile zokuhlolwa kwe-soldermask nokulawulwa kwekhwalithi:

Ukuhlola Okubonakalayo

Ukuhlola okubonakalayo kuyisinyathelo esibalulekile ekuhloleni ikhwalithi yongqimba lwe-soldermask. Yenza ukuhlola okubonakalayo okuphelele kwesendlalelo se-soldermask ukuze ubone noma yikuphi ukukhubazeka okusobala noma izinkinga. Sebenzisa amathuluzi okukhulisa, njengama-microscopes noma amalensi okukhulisa, ukuze uhlole izingxenye zephimbo elihle nezindawo eziminyana kakhulu.

Ukuhlola Okuzenzakalelayo Okubonakalayo (AOI)

Ukuhlolwa Okuzenzakalelayo Kokukhanya (i-AOI) kuyindlela yokuhlola ethuthukisiwe esebenzisa amakhamera anesinqumo esiphezulu kanye nesofthiwe yokucubungula izithombe ukuze ibone ngokuzenzakalelayo amaphutha kungqimba ye-soldermask. Sebenzisa i-AOI ngesikhathi senqubo yokukhiqiza ukuze ubambe amaphutha e-soldermask kusenesikhathi, unciphise ingozi yokulungiswa kabusha okubizayo noma ukulahla. Lungisa izilungiselelo namapharamitha e-AOI ukuqinisekisa ukutholakala okunembile kwamaphutha ngenkathi unciphisa okuhle noma okubi okungamanga.

Ukuhlolwa kagesi

Ukuhlola ugesi kuyisici esibalulekile sokulawula ikhwalithi esiqinisekisa ukusebenza nokusebenza kwe-PCB, okuhlanganisa ukusebenza kahle kwesendlalelo se-soldermask. Yenza ukuhlolwa kukagesi ku-PCB ukuze uqinisekise ukusebenza kahle nokuhambisana nemininingwane yedizayini. Sebenzisa izivivinyo zikagesi ukuze uqinisekise ukusebenza kwesendlalelo se-soldermask, njengezakhiwo zayo zokuhlukanisa kanye nokumelana nokuwohloka kukagesi.

Izinkinga ezijwayelekile ze-PCB Soldermask kanye nokuxazulula izinkinga

Ukuhlonza nokuxazulula izinkinga ezivamile ze-soldermask kubalulekile ukuze uqinisekise ukusebenza nokuthembeka kwama-PCB akho. Nazi ezinye izindaba ezivamile ze-PCB soldermask kanye nesiqondiso sendlela yokubhekana nazo nokuzivimbela:

I-Soldermask Misalignment

Ukungaboni kahle kwe-Soldermask kwenzeka lapho isendlalelo se-soldermask singaqondani kahle nezici zethusi ezingaphansi, okungase kuholele ekuvaleni kwe-solder noma imikhondo eveziwe. Buyekeza idizayini yakho ye-PCB ukuze uthole ukubekezelelana okufanele kwe-soldermask nezici zokuqondanisa, ezifana nezimpawu zefiducial. Sebenza nomkhiqizi wakho we-PCB ukuze uhlonze futhi ulungise noma yiziphi izinkinga zokubhalisa phakathi nenqubo yesicelo se-soldermask.

Ukufakwa Okungenele

Ukumbozwa okunganele kubhekisela ezindaweni eziku-PCB lapho ungqimba lwe-soldermask lungambozi ngokwanele izindawo ezihlosiwe, lushiya iminonjana noma amaphedi echayeke ekungcoleni okungaba khona noma ukugqwala. Hlola isendlalelo se-soldermask ukuze uthole ukujiya okufanayo kanye nokuhlanganisa, ubhekane nanoma yikuphi ukungahambisani nenqubo yesicelo. Buyekeza idizayini yakho ye-PCB ukuze uthole imvume efanele ye-soldermask kanye nokuvuleka, uqinisekise ukuthi ihlangabezana nezimfuneko zomkhiqizi wakho.

I-Soldermask Delamination

I-Soldermask delamination ukuhlukaniswa kwesendlalelo se-soldermask kusuka endaweni ye-PCB, engaphazamisa ukufakwa kukagesi webhodi kanye nokuzinza kwemishini. Qinisekisa ukulungiswa kahle kwendawo kanye nokuhlanza ngaphambi kwesicelo se-soldermask ukukhuthaza ukunamathela okuhle. Gada amaphrofayli okushisa ngesikhathi sezinqubo zokudayiswa ukuze uvimbele ukuchayeka kokushisa okudlulele okungaholela ekuncipheni.

I-Soldermask Bubbles noma i-Voids

Amabhamuza e-Soldermask noma ama-voids amaphakethe omoya noma izikhala ngaphakathi kwesendlalelo se-soldermask, esingathinta izakhiwo zokufaka ugesi kanye nokubukeka okuphelele kwe-PCB. Lezi zinkinga zingavela emoyeni ovaleleke ngesikhathi sokufaka isicelo, ukwelashwa okungafanele, noma izinkinga zezinto ezibonakalayo.

Sebenzisa amasu afanele esicelo se-soldermask ukuze unciphise ukungena komoya, njengokulungisa i-viscosity noma ukusebenzisa izendlalelo ezincane eziningi. Gada amapharamitha wokuphulukisa, njengezinga lokushisa nesikhathi, ukuze uqinisekise ukuphulukiswa okuphelele nokungaguquguquki kwezinto ezibonakalayo ze-soldermask.

Ngokubhekana nalezi zinkinga ezivamile ze-soldermask nokusebenzisa izinyathelo zokuvimbela, ungathuthukisa ikhwalithi nokuthembeka kwama-PCB akho.

Isiphetho

I-PCB soldermask iyisici esibalulekile emhlabeni wokukhiqiza izinto zikagesi, ehlinzeka ngokuvikeleka ezicini zemvelo, ukuvimbela amabhuloho athengiswayo, nokuqinisekisa ukwethembeka okuphelele kwezinto zikagesi. Ukuqonda izinhlobo ezihlukahlukene zezinto zokwakha ze-soldermask, izicelo zabo, kanye nezinzuzo zabo kanye nebubi kubalulekile kubaklami be-PCB nabakhiqizi.

Ukucatshangelwa okufana nemibala ye-soldermask, amasu ohlelo lokusebenza, izici zokuklama, izindlela zokuhlola, nokuxazulula inkinga okuvamile kungaba nomthelela omkhulu ekusebenzeni kanye nekhwalithi yama-PCB. Ngokwenza izinqumo ezinolwazi futhi ulandele izinqubo ezihamba phambili, ungakwazi ukuthuthukisa i-soldermask kumiklamo yakho ye-PCB, okuholela kumishini kagesi esezingeni eliphezulu nethembekile.