With the development of electronic products to high density and high precision, the same requirements are put forward for circuit boards, which makes circuit boards gradually develop in the direction of HDI. The most effective way to increase PCB density is to reduce the number of through-holes, and accurately set blind holes and buried holes.
Note that whether the laser hole is sleeved with the inner buried hole, or whether the holes of the two drill belts are at the same position.
Ordinary PCB multi-layer circuit board: the inner layer is not drilled;
All tooling holes should be drilled.Pay attention to rivets gh,which needs to be out to avoid misalignment(Aoigh is also die-cut).The edge of the pnl board needs to be drilled to distinguish each board.
Note that the film is produced positive and negative:
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