公开(公告)号：US09713261B2

公开(公告)日：2017-07-18

申请号：US14356209

申请日：2012-08-31

Applicant: Jianyuan Song ,  Weihong Peng ,  Pingping Xie ,  Dong Liu

Inventor： Jianyuan Song ,  Weihong Peng ,  Pingping Xie ,  Dong Liu

IPC: H05K3/00 ,  H05K3/12 ,  H05K3/18 ,  H05K3/42 ,  H05K3/34 ,  H05K3/46 ,  H05K1/02

CPC classification number: H05K3/00 ,  H05K1/0269 ,  H05K3/0017 ,  H05K3/0044 ,  H05K3/0047 ,  H05K3/0073 ,  H05K3/12 ,  H05K3/188 ,  H05K3/3452 ,  H05K3/42 ,  H05K3/425 ,  H05K3/428 ,  H05K3/4623 ,  H05K3/4629 ,  H05K2201/09036 ,  H05K2201/09845 ,  H05K2203/0315 ,  H05K2203/162 ,  Y10T29/49004 ,  Y10T29/49155 ,  Y10T29/49156 ,  Y10T29/49165 ,  Y10T29/49179

Abstract: A fabrication process of a stepped circuit board comprises A) cutting a circuit board substrate, printing patterns on an inner layer of the circuit board substrate, stepped groove milling of the inner layer, washer milling a washer between the inner layer and an outer layer, brownification and lamination processing on the inner layer, and then drilling holes on an outer layer of the circuit board substrate; B) electroplating the entire circuit board substrate by depositing copper on the outer layer of the circuit board substrate with drilled holes; C) performing pattern transfer by means of through-hole plating of the drilled holes on the circuit board substrate processed by the copper depositing and the electroplating; D) after pattern transferring, grinding a shape of a connecting piece (SET) on the circuit board substrate after the electroplating; E) plugging the drilled holes to form plug holes and printing a solder mask and texts in a silk-screen manner after forming the plug holes; F) depositing nickel immersion gold on the entire circuit board substrate, then printing characters in a silk-screen manner, thereby forming the stepped circuit board; and G) testing and inspecting an electric performance and appearance of the stepped circuit board to fabricate a finished product of the stepped circuit board.