A metallic Main printed circuit board (MCPCB) disposed more than the heat sink, wherein the MCPCB involves: a base metal layer that contains a 2nd steel; The bonded substrates 510 and 520 are not just pressed by the atmospheric pressure, but in addition by a force on the N2 or https://jiutustore.com/collections/optical-bonding-machine/Optical-Bonding-Machine