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Rigid flex Cross section PCB

jatins

Hi

I am looking into designing a 2 layer rigid and 1 layer flex PCB on PCB designer 17.2. The rigid area is decided but the flex area is not completely decided yet. Here is the cross section:

  

  • As you can see, FLEXMAIN has a polyimide dielectric. So is it required to have polyimide dielectric in the rigid(PRIMARY) area as well? or is it ok this way?
  • If i go for Semi-flex(flex to install) PCBs and drop this FLEXMAIN(Flex) option, what layers have to be assigned to that? Would it only be copper(conductor) layer and soldermask flexible then?
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