What is
 
  Cavity PCB technique is able to minimize the PCB thickness and chip mounted PCB can be multi stack-up.

< Multi Cavity PCB>

  Effect
    Thinner PCB than normal PCB
    Easy to keep Circuit design secret
    The customer can stack-up chip mounted PCB.
 
  Application
    PAM,Chip LED
    DC/DC Converter
    Camera Module,Image Sensor