Kev Tshawb Fawb Txog Kev Siv Tshuab Drilling Back hauv Kev Tsim PCB Ceev

Ua ntej, cov khoom ntawm qhov txuas ceev ceev yog:

(1) Kev ntim khoom ntawm cov khoom siv hluav taws xob: Feem ntau, qhov dav ntawm cov xov hlau PCB sab hauv cov khoom ntim khoom ntawm cov khoom siv hluav taws xob yog nqaim dua li ntawm cov khoom siv hluav taws xob ib txwm muaj, ua rau kev tswj hwm impedance nyuaj;

(2) PCB ntawm: PCB ntawm feem ntau yog cov teebmeem capacitive nrog cov yam ntxwv qis impedance, thiab nws yuav tsum yog qhov tseem ceeb tshaj plaws thiab ua kom zoo tshaj plaws hauv PCB tsim;

(3) Connector: Tus qauv tsim ntawm cov tooj liab sib txuas hauv lub connector yog cuam tshuam los ntawm ob qho tib si kev ntseeg tau ntawm cov khoom siv thiab kev ua haujlwm hluav taws xob, yog li ntawd yuav tsum nrhiav kev sib npaug ntawm ob qho.

Lub PCB via feem ntau yog tsim los ua qhov hla (los ntawm qhov saum toj mus rau txheej hauv qab). Thaum cov kab PCB txuas lub via raug xa mus ze rau txheej saum toj, qhov "stub" bifurcation yuav tshwm sim ntawm qhov via ntawm PCB interconnect link, ua rau muaj kev cuam tshuam rau lub teeb liab thiab cuam tshuam rau qhov zoo ntawm lub teeb liab. Qhov kev cuam tshuam no muaj kev cuam tshuam ntau dua rau cov teeb liab ntawm qhov ceev dua.

Kev siv tshuab drilling rov qab yog hais txog kev siv cov txheej txheem tswj qhov tob, siv txoj kev drilling thib ob los tho qhov Stub qhov phab ntsa ntawm qhov txuas lossis teeb liab.

Raws li pom hauv daim duab hauv qab no, tom qab lub qhov through-hole raug tsim, qhov Stub ntau dhau ntawm PCB through-hole raug tshem tawm los ntawm kev tho qhov thib ob los ntawm "sab nraub qaum". Tau kawg, txoj kab uas hla ntawm lub backdrill bit yuav tsum loj dua qhov loj ntawm lub qhov through-hole, thiab qib kev kam rau siab ntawm cov txheej txheem tho qhov yuav tsum ua raws li lub hauv paus ntsiab lus ntawm "tsis ua rau kev sib txuas ntawm lub qhov PCB thiab cov xov hlau puas tsuaj", xyuas kom meej tias "qhov ntev stub seem yog me li sai tau", uas hu ua "kev tswj qhov tob drilling".

Daim duab qhia txog qhov BackDrill seem uas hla qhov

Qhov saum toj no yog daim duab qhia txog qhov BackDrill uas hla dhau qhov. Sab laug yog lub qhov teeb liab ib txwm muaj, sab xis yog daim duab qhia txog qhov hla dhau tom qab BackDrill, qhia tias yuav tsum tau khawb los ntawm txheej hauv qab mus txog txheej teeb liab uas qhov cim qhia nyob.

Cov thev naus laus zis khawb rov qab tuaj yeem tshem tawm qhov cuam tshuam ntawm lub peev xwm parasitic uas tshwm sim los ntawm cov qhov phab ntsa stubs, ua kom muaj kev sib xws ntawm cov xov hlau thiab impedance ntawm qhov hla hauv qhov txuas channel, txo cov teeb liab reflection, thiab yog li txhim kho qhov zoo ntawm lub teeb liab.

Backdrill tam sim no yog thev naus laus zis pheej yig tshaj plaws uas yog qhov zoo tshaj plaws rau kev txhim kho kev ua haujlwm ntawm kev xa xov channel. Kev siv thev naus laus zis backdrilling yuav ua rau tus nqi ntawm PCB tsim khoom nce ntxiv rau qee qhov.

Kev khawb rov qab muaj 2 hom: kev khawb ib sab thiab kev khawb ob sab.

Kev tho ib sab tuaj yeem muab faib ua kev tho rov qab los ntawm sab saum toj lossis sab hauv qab. Lub qhov PIN ntawm lub qhov ntsaws txuas tsuas yog tuaj yeem tho rov qab los ntawm sab uas nyob ib sab ntawm lub ntsej muag uas qhov txuas nyob. Thaum cov khoom sib txuas ceev ceev tau teeb tsa rau ntawm ob sab saum toj thiab hauv qab ntawm PCB, yuav tsum tau tho rov qab ob sab.

1) Txo cov suab nrov cuam tshuam;

2) Txhim kho qhov kev ncaj ncees ntawm lub teeb liab;

3) Lub thickness ntawm lub rooj tsavxwm hauv zos txo qis;

4) Txo kev siv cov faus/dig muag kom txo qhov nyuaj ntawm kev tsim PCB.

Lub luag haujlwm ntawm kev khawb rov qab yog dab tsi?

Lub luag haujlwm ntawm kev khawb rov qab yog khawb tawm cov ntu uas tsis muaj kev sib txuas lossis kev ua haujlwm kis tau kom tsis txhob muaj kev cuam tshuam, kev tawg, kev ncua sijhawm, thiab lwm yam hauv kev xa xov ceev ceev.

Cov txheej txheem drilling rov qab

a. Muaj cov qhov tso rau ntawm PCB, uas yog siv rau thawj qhov chaw drilling thiab thawj qhov drilling ntawm PCB;

b. Siv hluav taws xob los pleev xim rau PCB tom qab thawj qhov khawb, thiab zaj duab xis qhuav kaw lub qhov ua ntej siv hluav taws xob los pleev xim rau;

c. Tsim cov qauv sab nraud ntawm cov PCB electroplated;

d. Ua cov qauv electroplating rau ntawm PCB tom qab tsim cov qauv txheej sab nraud;

e. Siv lub qhov uas tau siv los ntawm thawj qhov kev khawb rau qhov chaw khawb rov qab, thiab siv rab riam laum rau kev khawb rov qab;

f. Ntxuav lub qhov tom qab nrog dej kom tshem tawm cov khib nyiab uas tseem tshuav sab hauv.