9 Replies Latest reply on Apr 19, 2012 6:20 AM by jmatthews

    Flex PCB


      I have my first flex pcb coming up.  I have been looking everywhere trying to figure out how to do it.  How does the layout of a flex differ from a rigid?  I see on a PCB manufacturers website I need to do a stiffener?  Also indicate base material, copper thickness, cover layer thickness, as well as stiffener material and thickness.  Any help anyone can give or point to that will help me figure out how to do flex layouts would be very apprciated.


        • 1. Re: Flex PCB

          I'm familiar with flex designs but haven't done one myself.  Here is some training that I found out about recently that you might find interesting:




          Divided into nine sessions, the Flexible Circuits Technology Training Video   Series  is a comprehensive view into the Structures, Applications,   Materials,  and Manufacturing Processes of flexible printed circuits.


          Each session covers a   specific aspect of flexible circuit technology. This video series is a companion   to the book, Flexible Circuits Technology. Watch for the fourth edition   coming soon in 2011.


          Session Overview


          1. Brief history of flexible printed circuits and basic flex structures.
          2. Flex technology drivers, markets and applications.
          3. Flex circuit material, polymers, adhesives and conductors.
          4. Implementing flexible circuit technology into products.
          5. Flexible circuit designs, principles and practices.
          6. Enhancing flex circuit robustness, stiffeners for flex circuits, special   design techniques.
          7. Design guidelines for bending, folding  and dynamic movement of flexible   circuits; test methods for evaluating  cyclical flex life.
          8. Flexible circuit manufacturing. Single  and double-sided, multilayer and   rigid flex. Roll-to-roll processing  and printed electronics.
          9. Flexible circuit singulation methods,  assembly aids, solderless rigid flex   constructions, connector options  and assembly standards.
          1 of 1 people found this helpful
          • 2. Re: Flex PCB

            Just Google it. The resources are numerous.

            • 3. Re: Flex PCB


              I will look it this weekend.


              I have tried Google, I have founds of info on the basics of what a flex PCB is, but I haven't had much luck finding what the gerbers are like for the board house or how to pick materials.

              • 4. Re: Flex PCB

                A good resource can be the board house.  If they build flex boards they are likely to have a document that will tell you what they need.  Different board houses do things differently - it is always a good idea to check with them.  The good ones have a technical person on staff that can be a great help.

                • 5. Re: Flex PCB

                  Hello Everyone,


                  We have an excellent resource on our website for flex circuit design & manufacturing, written by Robert Tarzwell.


                  Normally we offer the e-books in this section for free for a limited time as a promotion but charge $10 per download after this period expires.


                  However, I've removed the pay-only period and have extended the ability to download the e-book for free until 9/30/2011.


                  Here's the link and let us know if you have any questions about it: San Francisco Circuits PCB school


                  - Victor

                  San Francisco Circuits | PCB Fab

                  • 6. Re: Flex printed circuit layer set up

                    i am trying to evaluate using pasd to design flexible printed circuit. A flexible printed circuit is a single layer of copper with two layers of material on top and two layers of materials on thee back side, copper is is center. The two top layers (kapton and Adhesive) have cutouts to expose the copper traces and the components are mounted on teh top side (surface mount) I do not know how to go about setting up the layers. Has anyone done this and if so can you guide me or send me a file with the layers set up?





                    • 7. Re: Flex printed circuit layer set up

                      Hello Al,


                      It is possible but it will take a lot of typing. I do not like typing a lot so if you let me know where I can call you. You also contact Mentor Customer Support and they will help you also.


                      Regards, Yan

                      • 8. Re: Flex printed circuit layer set up


                        I design Flex/rigid flex all the time with PADS.


                        The secret is a good fabrication drawing with a well labeled stackup that

                        pertains to your situation. Artworks and drill files if any) are pretty much standard fare.


                        I use "Solder Mask" relief artworks as coverlay(s).- when necessary.  Copper is Copper. Any silkscreen is regular also.


                        I'm afraid I can't give you a fab drawing but you get the idea.


                        The fab drawing is the key, not PADS layering per se.


                        My 2 cents anyway......



                        • 9. Re: Flex PCB