1 Reply Latest reply on May 17, 2011 3:53 AM by TomG

    What kind of Flex Designs are you creating?  Survey says...

    Rob_Kelley

       

      Hi,

       

       

      Many of our customers are actively involved in designing Flex and or Rigid-Flex PCBs.  And some of you are contemplating a move into the Flex design space. 

       

       

      As we develop more Flex and Rigid-Flex functionality it would be very helpful for us to better understand what our current customers are doing so we can better meet your needs in the future.

       

       

      For those of you that are already designing Flex PCBs, would you please take minute to respond to this short survey?  And if you are not yet designing Flex boards but are currently looking at the prospect of doing so, please let us know what you anticipate your future needs are going to be.

       

       

      Any and all information will be very much appreciated!

       

       

      Thanks and best regards,

       

       

      Rob

       

       

      So here's the survey:

       

       

      1) How many layers does your typical flex design have?

       

       

      2) How many layers does your typical rigid flex design have?

       

       

       

       

       

      3) Does the flex region ever have solder mask on it or does it only have coverlay layers?

       

       

       

       

       

      4) Do your rigid flex designs ever have completely independent layer stickups in the rigid and flex areas? In other words, the flex part of the stackup does not go across the entire design as shown in the figure above.

       

       

       

       

       

      5) Do your rigid flex designs have any signals passing through the flex area that need to be simulated for Signal Integrity or EMI considerations?

       

       

       

       

       

      6) What output files do you usually send to your PCB fabrication vendor? Do you have to do any special preparation work to the data before sending it to them?

       

       

      7) How do you manage the library and utilize parts used in the Rigid and Flex areas?   

       

        • Do you want to manage one library for components placed in the Rigid and Flex areas, then change the pad and solder/coverlay mask accordingly?

        • Or do you want to manage two libraries: one for Rigid and one Flex area, even when the component is same?

       

      8) What Design Rule Check functions are required for on-line and/or batch mode?

       

       

       

       

       

       

       

       

        • 1. Re: What kind of Flex Designs are you creating?  Survey says...
          TomG

          Hi Rob,

           

          we are just desinigning a rigid-flex-rigid board in PADS9.3 Flow and we have quite a problem to generate an outline to be acceptible by PCB producers:

           

          And now back to your questions:

           

          1. 2, 3, and 4 layers are common

          2. a) 4, 5 and 6 layers are common

              b) yes, one rigid side has e.g. 6 layers and second side can have only 4 layers as is shown in picture

          3. Yes it has solder mask on flex because we try to put a component on flex. The same goes to 4 layer on right side of your picture. So far we put a component into layer 2 (right side rigid top) or 3 (flex) which means, in fact, into inner layers.

          4. Yes it may happen

          5. we do not use it. I cannot judge it

          6. we send gerger and excellon (drill) data. No we do not tweak this data

          7.The best approach to it would be to keep one library with standard footprints (pads in component and opposite sides) and if you need to make an inner pad, e.g. for flex, you just edit the component in question. Easy. Besides, every design has different demands so it would have different footprint and thus you can end up with dosens of different variants of the same footprint. Not good!

          8. See your picture. There is one check for board outline. Since you can only place traces on PCB inside the board ouline how can you set that for flex there is different area than for rigid part?

           

          One more thing. we have a special problem with outline generation for rigid-flex-rigid board. PCB producers usually need two separate outlines, one for rigid and second for flex. PADS Layout cannot make two separate outlines, so how can it be solved? Can you help? My email is tomas.gubek@fei.com

          BTW Old MS-DOS version of OrCAD can make External, Internal outline and also can create infinite number of user-defined outlines. Why not PADS Layout from 2011???

           

          Regards,

          Tomas Gubek