Lokacin tsarawa PCB pads a cikin ƙirar allo na PCB, ya zama dole a ƙera shi sosai gwargwadon buƙatu da ƙa’idodi masu dacewa. Saboda ƙirar kushin PCB yana da matukar mahimmanci a cikin sarrafa SMT, ƙirar pad za ta shafi kai tsaye, kwanciyar hankali da canja wurin zafi na abubuwan, waɗanda ke da alaƙa da ingancin aikin SMT, don haka menene ƙimar ƙirar PCB pad?

Tsarin ƙira na ƙira da girman faifan PCB:

1. Kira daidaitaccen ɗakin karatu na PCB.

2, ƙaramin kushin gefe ɗaya bai gaza 0.25mm ba, matsakaicin diamita na duka kushin bai fi sau 3 buɗewar ɓangaren ba.

3. Yi ƙoƙarin tabbatar da cewa tazara tsakanin gefunan faifan biyu ya fi 0.4mm.

4. Pads tare da diamita da ya wuce 1.2mm ko 3.0mm za a tsara su azaman lu’u -lu’u ko filaye

5. Game da wayoyi masu kauri, ana ba da shawarar faranti masu haɗaɗɗen oval da oblong. The diamita ko m nisa daga guda panel kushin ne 1.6mm; Ƙungiya biyu mai rauni raunin layin layi na yau da kullun kawai yana buƙatar diamita rami tare da 0.5mm, babban kushin yana da sauƙin haifar da walƙiya mai mahimmanci.

Biyu, kushin PCB ta ma’aunin girman rami:

Ramin ciki na kushin ba kasa da 0.6mm ba, saboda ba abu bane mai sauƙin aiwatarwa lokacin da ramin bai wuce 0.6mm ba. Yawancin lokaci, diamita na fil ɗin ƙarfe da 0.2mm ana amfani dashi azaman ramin ciki na kushin. Idan diamita na karfe na juriya shine 0.5mm, ramin ramin ciki na kushin shine 0.7mm, kuma diamita na kushin ya dogara da diamita ramin ciki.

Mahimman mahimman ƙira na ƙimar PCB pad

1. Symmetry, don tabbatar da daidaiton tashin hankali na murɗaɗɗen murfi, duka ƙarshen kushin dole ne ya daidaita.

2. Tazarar kushin, tazarar kushin ya yi yawa ko kuma ƙanƙanta zai haifar da lahani na waldi, don haka a tabbatar an ƙare ɓangaren ko fil ɗin an daidaita su da kyau daga kushin.

3. Girman ragowar kushin. Girman ragowar ƙarshen ɓangaren ko fil bayan cinya tare da kushin dole ne tabbatar da cewa haɗin gwiwa mai siyarwa zai iya samar da saman meniscus.

4. Faɗin kushin ya kamata ya zama daidai da faɗin ƙarshen ƙarshen ko fil.

Daidaitaccen ƙirar ƙwallon PCB, idan akwai ƙaramin ƙwanƙwasa yayin aikin SMT, ana iya gyara shi yayin walƙiya mai jujjuyawa saboda tashin hankalin farfajiyar murɗaɗɗen mai siyarwa. Idan ƙirar kushin PCB ba daidai ba ne, koda yanayin hawa yana da inganci sosai, yana da sauƙi a bayyana karkacewar matsayin sashi, gadar dakatarwa da sauran lamuran walda bayan sake kunna walda. Don haka, ya kamata a mai da hankali kan ƙirar ƙwallon PCB lokacin zayyana PCB.