METHOD OF MANUFACTURING MULTILAYER PRINTED WIRING BOARD AND DOUBLE SIDE EXPOSING TOOL

摘要

PROBLEM TO BE SOLVED: To provide a method of manufacturing a multilayer printed wiring board whereby the centers of target marks formed on inner layers cores, corresponding to their positions, hardly deviate from each other, and a double side exposing tool effective for accurately and easily forming the target marks on the inner layers cores. SOLUTION: The exposing tool 1 uses a combination of a film 3 having an exposure pattern 5A with a glass dry plate 2 having an exposure pattern 5B and positioning hole marks and target marks are formed, using the exposure pattern 5B of the dry plate 2.