01
Sei puzzle
Mushure mekunge bhodhi redunhu ragadzirwa, iyo SMT chigamba mutsara wegungano inoda kusungirirwa kune izvo zvikamu.Imwe neimwe SMT inogadzirisa fekitori inotsanangura iyo yakanyanya kufanirwa saizi yedunhu bhodhi zvinoenderana nezvinodiwa zvekugadzirisa mutsara wegungano.Semuenzaniso, saizi idiki kana yakakura kwazvo, uye mutsara wegungano wakagadziriswa.Iyo tooling yebhodhi redunhu haigone kugadziriswa.Saka mubvunzo ndewokuti, chii chatinofanira kuita kana saizi yebhodhi redu redunhu pachayo idiki pane saizi yakataurwa nefekitari?Ndiko kuti, tinoda kuunganidza bhodhi redunhu uye kuisa akawanda edunhu mabhodhi muchikamu chimwe.Kuiswa kunogona kuvandudza zvakanyanya kushanda kune ese ari maviri akakwira-kumhanya yekuisa michina uye wave soldering.
02
Tsanangudzo yemashoko
Usati watsanangura maitiro ekushanda zvakadzama pazasi, tanga watsanangura mashoma akakosha mazwi
Maka poindi: sezvinoratidzwa mumufananidzo 2.1,
Inoshandiswa kubatsira iyo optical positioning yemuchina wekuisa.Kune angangoita maviri asymmetric mareferensi mapoinzi pane diagonal yePCB board ine chigamba chishandiso.Iwo mareferensi mapoinzi eiyo optical positioning yePCB yese anowanzo ari panzvimbo inoenderana pane diagonal yePCB yese;iyo optical positioning yePCB yakakamurwa Nzvimbo yereferensi inowanzova panzvimbo inowirirana pane diagonal ye sub-block PCB;yeQFP (quad flat package) ine lead pitch ≤0.5mm uye BGA (ball grid array package) ine ball pitch ≤0.8mm, kuitira kuti uvandudze kurongeka kwekuisa, inodiwa Isa nzvimbo yereferenzi pamakona maviri akatarisana. iye IC
Benchmark zvinodiwa:
a.Chimiro chakasarudzwa chechirevo chechirevo idenderedzwa rakasimba;
b.Saizi yereferensi point ndeye 1.0 +0.05mm mudhayamita
c.Nzvimbo yereferensi inoiswa mukati meiyo inoshanda PCB renji, uye nzvimbo yepakati yakakura kupfuura 6mm kubva kumucheto kwebhodhi;
d.Kuti uve nechokwadi chekucherechedzwa kwekuita kwekudhinda uye chigamba, hapafanirwe kunge paine mamwe masikirini e-silk-maki, mapedhi, V-grooves, maburi ematampu, PCB board gap uye wiring mukati me2mm pedyo nemucheto wefiducial mark;
e.Iyo referensi pad uye solder mask yakaiswa nemazvo.
Tichifunga nezvekusiyanisa pakati pemuvara wezvinhu uye zvakatipoteredza, siya nzvimbo isina kutengesa 1 mm yakakura kudarika chiratidzo chechiratidzo chekutarisa, uye hapana mavara anobvumirwa.Hazvidikanwi kugadzira simbi yekudzivirira mhete kunze kwenzvimbo isina soldering.