Inkqubo esisiseko yeibhodi yesekethe PCBuyilo kwi-SMT chip processing lufuna ingqalelo ekhethekileyo. Enye yeenjongo eziphambili zoyilo lwenkqubo yesekethe kukubonelela ngetafile yenethiwekhi yoyilo lwebhodi yesekethe yePCB kunye nokulungiselela isiseko soyilo lwebhodi yePCB. Inkqubo yoyilo yebhodi yesekethe ye-PCB enemigangatho emininzi iyafana namanyathelo oyilo lwebhodi ye-PCB eqhelekileyo. Umahluko kukuba i-wiring yomgca wesignali ephakathi kunye nokwahlula kombane wangaphakathi kufuneka kuqhutywe. Kuthathwe kunye, uyilo lwebhodi yesekethe ye-PCB enemigangatho emininzi iyafana. Yahlulwe ngokwala manyathelo alandelayo:
1. Ukucwangciswa kwebhodi yesekethe kubandakanya ukucwangcisa ubukhulu bomzimba webhodi yePCB, ifom yokupakisha yamacandelo, indlela yokufakela icandelo, kunye nesakhiwo sebhodi, oko kukuthi, iibhodi ezinomgca omnye, iibhodi eziphindwe kabini, kunye ne-multi-layer. iibhodi.
2. Ukusetwa kweparamitha yokusebenza, ikakhulu kubhekiselele kwindawo yokusebenza ipharamitha yokuseta kunye nokusetwa kwepharamitha yomaleko wokusebenza. Ukusetwa okuchanekileyo kunye nokufanelekileyo kweeparamitha ze-PCB zokusingqongileyo kunokuzisa uncedo olukhulu kuyilo lwebhodi yesekethe kunye nokuphucula ukusebenza kakuhle.
3. Uyilo lwecandelo kunye nohlengahlengiso. Emva kokuba umsebenzi wokuqala ugqityiwe, itafile yenethiwekhi ingangeniswa kwi-pcb, okanye itafile yenethiwekhi ingangeniswa ngokuthe ngqo kumzobo weskimu ngokuhlaziya i-pcb. Uyilo lwecandelo kunye nohlengahlengiso yimisebenzi ebaluleke kakhulu kuyilo lwePCB, echaphazela ngokuthe ngqo imisebenzi elandelayo efana neengcingo kunye nokwahlulahlulwa kombane kwangaphakathi.
4. Iisetingi zomgaqo wocingo zisete ubukhulu becala iinkcukacha ezahlukeneyo zocingo lwesekethe, ezinjengobubanzi becingo, isithuba semigca enxuseneyo, umgama wokhuseleko phakathi kweengcingo neepads, nangobukhulu. Kungakhathaliseki ukuba yeyiphi indlela yocingo eyamkelweyo, imithetho yocingo iyimfuneko. Isinyathelo esiyimfuneko, imithetho yocingo elungileyo inokuqinisekisa ukhuseleko lokuhamba kwebhodi yesekethe, ukuthobela iimfuno zenkqubo yokuvelisa, kwaye ugcine iindleko.
5. Eminye imisebenzi encedisayo, efana nokugquma ubhedu kunye nokuzaliswa kwe-teardrop, kunye nokucubungula amaxwebhu afana nokukhutshwa kwengxelo kunye nokugcina ukuprintwa. Ezi fayile zingasetyenziselwa ukujonga nokuguqula iibhodi zeesekethe zePCB, kwaye zingasetyenziswa njengoluhlu lwamacandelo athengiweyo.
Imigaqo yecandelo lendlela
1. Akukho cingo luvunyelwe ngaphakathi kwendawo ≤1mm ukusuka kumda webhodi yePCB kwaye ngaphakathi kwe-1mm ejikeleze umngxuma wokunyuka;
2. Intambo yombane kufuneka ibe banzi kangangoko kwaye ingabi ngaphantsi kwe-18mil; ububanzi bomgca wesignali akufunekanga bube ngaphantsi kwe-12mil; igalelo le-CPU kunye nemigca yemveliso akufanele ibe ngaphantsi kwe-10mil (okanye i-8mil); isithuba somgca akufuneki sibe ngaphantsi kwe-10mil;
3. Ngemingxuma eqhelekileyo ayikho ngaphantsi kwe-30mil;
4. Iplagi ye-Dual in-line: pad 60mil, indawo yokuvula i-40mil; I-1/4W i-resistor: 51 * 55mil (i-0805 yokunyuka kwendawo); xa iplagwe, pad 62mil, imbobo 42mil; i-electrodeless capacitor: 51 * 55mil (0805 ukuphakama komhlaba); Xa ifakwe ngokuthe ngqo, i-pad yi-50mil kunye ne-diameter yomngxuma yi-28mil;
5. Qaphela ukuba iintambo zombane kunye neengcingo zomhlaba kufuneka zibe njenge-radial kangangoko kunokwenzeka, kwaye imigca yesignali ayifanele ihanjiswe kwiilophu.