The inner core of our multilayer is now complete. Next we punch the registration holes we will use to align the inner layers to the outer layers. The operator loads the core into the optical punch which lines up the registration targets in the copper pattern and punches the registration holes.
We won’t be able to correct any mistakes on the inner layers once we have assembled the multilayer so we now give the panel a complete machine inspection.
The automatic optical inspection system scans the board in broad strips and compares it with the digital image generated from the original design data. Any errors are displayed on screen.
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