| 摘要 |
PROBLEM TO BE SOLVED: To omit sticking process and a peeling process of a lining material by forming a metallic foil, which is the same as the metallic film of a tape-like base film surface as a reinforcing material and forming a wiring pattern in a front side via a specified process in both surfaces thereof. SOLUTION: After a perforation 14 is punched out in both sides of a tape-like base film 13, front and rear photoresists 15, 16 are applied on copper foils 11, 12 of both sides thereof. After the photoresists 15, 16 are subjected to exposure and development, both the front and rear sides are etched for pattern formation. Then, after photoresist of both the front and rear sides is peeled, plating 17 is applied and solder resist 18 is printed to the front side. Thereafter, an outer hole 19 is punched out for each package part, and the circumference of the perforation 14 in both sides is left reinforced by a copper foil 12 on the rear side.
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