Nrog rau kev txhim kho ntawm PCB thev naus laus zis thiab kev xav tau ntawm cov neeg siv khoom kom nrawm dua thiab muaj zog dua, PCB tau hloov pauv los ntawm cov txheej txheem ob txheej txheej rau lub rooj tsavxwm nrog plaub, rau txheej thiab txog li kaum mus rau peb caug txheej ntawm dielectric thiab conductors. . Vim li cas thiaj nce cov txheej txheem? Muaj ntau cov khaubncaws sab nraud povtseg tuaj yeem ua kom lub zog faib tawm ntawm lub rooj tsavxwm Circuit Court, txo kev sib tham, tshem tawm cov kev cuam tshuam ntawm electromagnetic thiab txhawb cov teeb liab ceev. Tus naj npawb ntawm cov khaubncaws sab nraud povtseg siv rau PCB nyob ntawm daim ntawv thov, kev khiav hauj lwm zaus, tus pin ceev, thiab teeb liab txheej yuav tsum tau.

Los ntawm stacking ob txheej, txheej saum toj kawg nkaus (piv txwv li, txheej 1) yog siv los ua cov teeb liab txheej. Cov plaub-txheej txheej siv cov txheej sab saum toj thiab hauv qab (lossis 1st thiab 4th txheej) ua cov teeb liab txheej. Hauv qhov kev teeb tsa no, 2nd thiab 3rd txheej yog siv los ua dav hlau. Lub prepreg txheej bonds ob los yog ntau tshaj ob-sided panels ua ke thiab ua raws li ib tug dielectric ntawm txheej. Lub rau-txheej PCB ntxiv ob txheej tooj liab, thiab txheej thib ob thiab thib tsib yog cov dav hlau. Cov txheej 1, 3, 4, thiab 6 nqa cov teeb liab.

Ua mus rau cov txheej txheem rau-txheej, txheej txheej sab hauv ob, peb (thaum nws yog ob sab pawg thawj coj saib) thiab plaub tsib (thaum nws yog ob sab board) ua cov txheej txheem tseem ceeb, thiab prepreg (PP) yog sandwiched ntawm cov core boards. Txij li cov khoom siv prepreg tsis tau kho tag nrho, cov khoom yog softer dua li cov khoom tseem ceeb. Cov txheej txheem tsim PCB siv cov cua sov thiab siab rau tag nrho pawg thiab melts lub prepreg thiab core kom cov khaubncaws sab nraud povtseg tuaj yeem ua ke.

Multilayer boards ntxiv tooj liab thiab dielectric txheej ntxiv rau pawg. Nyob rau hauv yim-txheej PCB, xya sab hauv kab ntawm lub dielectric kua nplaum plaub txheej txheej thiab plaub lub teeb liab txheej ua ke. Kaum mus rau kaum ob-txheej boards nce tus naj npawb ntawm cov txheej txheem dielectric, khaws plaub txheej txheej txheej, thiab nce cov teeb liab txheej.