MANUFACTURE OF PRINTED WIRING BOARD

摘要

In the prodn. of printed circuits on Cu-plated insulating laminated boards, a photoresist film is electro-deposited by immersing the board in a bath based on a water-soluble or dispersible photocurable plastics and applying a d.c. current. The process is claimed for use with a board having through-holes and as one stage of an automatic process. It avoids loss of material and allows an overall resist film to be applied without using costly equipment and additional personnel.