11.1 What are Multi-layers? Multi-layers, or multi-layer PCBs are circuit boards made up of more than two electrical layers (copper layers) superimposed on each other. The copper layers are bonded ...

The OKI Group printed circuit board (PCB) business company OKI Circuit Technology (President: Masaya Suzuki; Headquarters: Tsuruoka City, Yamagata Prefecture; "OTC" hereinafter) has successfully ...