Patent ID: 8448571

Claim:
A method for screen printing a printed circuit board substrate, the method comprising: providing a printed circuit board substrate comprising an insulating layer and a copper foil layer formed on the insulating layer; forming multiple marks {M i }, i=1, 2, . . . , N, on the copper foil layer, N being an integer equal to or greater than two; providing multiple screens {S i }, i=1, 2, . . . , N, wherein the ith screen S i comprises an ith screen pattern and an ith opening spatially corresponding to the ith mark M i ; attaching the ith screen S i on the copper foil layer in a manner such that the ith Mark M i is exposed through the ith opening; applying printing material on the ith screen Si so as to form an ith printing pattern on the copper foil layer to cover the ith Mark M i at the ith opening, the ith printing pattern conforming to the ith screen pattern; checking whether the ith mark is covered by the printing material when i is less than N; and applying printing material on the (i+1)th screen S i+1 so as to form an (i+1)th printing pattern on the copper foil layer to cover the (i+1)th Mark M i+1 at the (i+1)th opening, if the ith mark is covered by the printing material.