I would love to hear your reasoning for designing a board this way,
but anyway yes, it is possible, if you have the money for it.

What would probably happen if the board is thick and the flex is
short, is that when you try to fold it the inside layers would "bunch up"
against the outside layers, kind of crinkle. If that is a problem there
is a process we used back in the early 90's called "book binding" which
cuts each layer of flex slightly longer, so you have a gradually
increasing radius. When you fold a book-binding flex, you get more
concentric bends. I know Teledyne used to do this, maybe others.

good luck,

Jack

p.s. why are you designing the surface layers as flex, instead of using
layers 7-8-9-10? Or if they really are two 8-layers, 4-5&12-13?


> ----------------------------------------------------------------------
>
> Date:    Mon, 6 Sep 2004 08:31:20 +0300
> From:    Sefika Ozkal <[log in to unmask]>
> Subject: rigid-flex PCB manufacturing
>
> Dear Technetters,
>
> I have designed a rigid-flex PCB of 16 layers. First 8 layer can be
> considered as a rigid-flex PCB with 2 flex layers (1st and 8th layers)
and
> 6
> rigid layers (2nd to 7th layers).
> Second 8 layer can also be considered as another rigid-flex PCB with 2
> flex
> layers(9th and 16th layers) and 6 rigid layers(10th to 15th layers).
> When looked through the cross-section of the PCB, although left part is
> seen
> as 16 glued layers, right part is seen separeted in to two (2 pieces, 8
> layer rigid-flex PCBs).
>
> What I wonder is if it is possible to manufacture such a design or not?
> Thank you very much.
> Regards
>
> Sefika OZKAL
> Design Engineer
>
> ASELSAN INC.
> MGEO Division.

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