Lokacin zayyana mashinan PCB a ciki PCB allon zane , Wajibi ne a tsara shi sosai daidai da buƙatu da ƙa'idodi masu dacewa.Domin a cikin sarrafa facin SMT, ƙirar PCB pad yana da mahimmanci.Zane na kushin zai shafi kai tsaye ga solderability, kwanciyar hankali da canja wurin zafi na abubuwan.Yana da alaƙa da ingancin sarrafa facin.To menene ma'aunin ƙirar PCB pad? 1. Ƙirar ƙira don siffa da girman pads na PCB: 1. Kira ɗakin karatu na fakiti na PCB. 2. Matsakaicin gefe ɗaya na kushin baya ƙasa da 0.25mm, kuma matsakaicin diamita na gabaɗayan kushin bai wuce sau 3 na buɗewar ɓangaren ba. 3. Yi ƙoƙarin tabbatar da cewa nisa tsakanin gefuna na pads biyu ya fi 0.4mm girma. 4. Pads tare da buɗaɗɗen da suka wuce 1.2mm ko diamita na kushin da ya wuce 3.0mm yakamata a tsara su azaman nau'in lu'u-lu'u ko nau'in quincunx. 5. A cikin yanayin daɗaɗɗen wayoyi, ana ba da shawarar yin amfani da faranti na haɗin kai na oval da oblong.Diamita ko mafi ƙarancin nisa na kushin guda ɗaya shine 1.6mm;kushin kewaye mai rauni na yanzu na katako mai gefe biyu kawai yana buƙatar ƙara 0.5mm zuwa diamita na rami.Babban kushin yana iya haifar da ci gaba da walƙiya mara amfani cikin sauƙi.
PCB pad ta hanyar daidaitattun girman:
Ramin ciki na kushin gabaɗaya baya ƙasa da 0.6mm, saboda ramin da ke ƙasa da 0.6mm ba shi da sauƙin aiwatarwa yayin buga mutun.Yawancin lokaci, diamita na fil ɗin ƙarfe da 0.2mm ana amfani dashi azaman diamita na rami na ciki na kushin, kamar diamita na fil ɗin ƙarfe na resistor Lokacin da yake 0.5mm, diamita na rami na ciki na kushin yayi daidai da 0.7mm , kuma diamita na kushin ya dogara da diamita na rami na ciki.
Uku, amintattun abubuwan ƙira na pads na PCB:
1. Symmetry, don tabbatar da ma'auni na yanayin tashin hankali na narkakkar solder, pads a duka iyakar dole ne su kasance masu daidaituwa.
2. Tazarar pad.Matsakaicin girma ko ƙananan tazarar kushin zai haifar da lahani.Don haka, tabbatar da cewa tazara tsakanin iyakar abubuwan da ake bukata ko fil da pads ya dace.
3. Ragowar girman kushin, ragowar girman ɓangaren ƙarshen ko fil da kushin bayan haɗin gwiwa dole ne su tabbatar da cewa haɗin gwiwa na solder zai iya samar da meniscus.
4. Nisa na kushin ya kamata ya zama daidai da nisa na tip ko fil.
Daidaitaccen ƙirar kushin PCB, idan akwai ƙaramin adadin skew yayin sarrafa facin, ana iya gyara shi saboda tashin hankali na narkakkar solder yayin reflow soldering.Idan ƙirar kushin PCB ba daidai ba ne, ko da matsayin jeri daidai ne, lahani na siyar da lahani irin su bangaren matsayi diyya da gadoji na dakatarwa zai iya faruwa cikin sauƙi bayan sake dawo da siyarwar.Saboda haka, lokacin zayyana PCB, ƙirar PCB na kushin yana buƙatar yin hankali sosai.
1.6mm kauri latest kore solder mask PCB yatsa na zinari Saukewa: FR4 CCL
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