Development and transfer to production of a flexible printed circuit board
In this article I want to share my experience of self-development of a flexible printed circuit board (flex pcb) with the subsequent placement of an order for production.
It so happened that there was an urgent need to urgently start the process of developing a flexible printed circuit board. Such a board will act as a spare part for industrial equipment. As it will later become clear that it is much more profitable to spend some time on the design and preparation of the project. And this idea turned out to be more effective. Allowed the company to save money on purchasing from a supplier.
The main thing here is that you can complete all the stages of work on the project on your own. From idea, to production launch and final testing. And, of course, outsource production.
At the very beginning, by itself I made a diagram of the future board. Nothing complicated awaited me, the simplest part. All work was done in the DipTrace environment.
I needed a very small printed circuit board. The board will be made on a 0.1 mm polyimide base. It will also contain electronic components, resistors and capacitors. A flexible printed circuit board is still more like a cable. In fact, it probably is.
One end of it has a group of contacts that will later be inserted into the connector on the controller board. This part needs to be strengthened, stiffened. This is achieved by gluing a thicker layer of polyimide on the opposite side of the contacts.
And the contact group should remain pure copper, for this we will indicate in the production specification that in this part it is necessary to make contacts according to the "Gold Finger" parameter. Yes, golden fingers.
The other end of the cable-board will also have a group of contacts - Gold Finger. But this group will already be soldered to another board. The group of contacts will be placed mirrored from the top and bottom sides. Additionally, to facilitate installation, we will make semicircular cutouts on each contact. In fact, it plays the role of an interlayer transition.
As I already said, electronic components - resistors and capacitors - will be located on the cable cable. I think that this part also needs to be strengthened. To increase the resource of the loop in the place of deflections. Well, so that the components do not fall off. We will no longer strengthen it with polyimide, but with textolite.
All these parameters must be transferred to engineers for a more accurate calculation of the cost and adjustment of the production process. Everything can be documented. Even a picture with dimensions, sides and the parameters themselves will do. Where will the reinforcing polyimide, also textolite. The sizes of these sites. We also indicate the dimensions of the extreme contacts. This file is actually an integral part of the production order. Take a look at my example.
After placing an order online through your personal account, write to the engineers at support@3pcb.com, indicate the order number in the subject line, and indicate in the message that you are sending the parameter file. Don't forget to attach this same file.
We choose the thickness of the textolite 0.25 mm. The textolite will be located on the opposite side of the components. The area of the reinforcing textolite will slightly exceed the area on which the elements will be soldered.
The solder mask and silkscreen color are yellow and white, respectively. Left by default. To reduce the cost of production, you can set the E-test parameter - do not perform. Electric control will not be carried out, but the cost will also be significantly reduced.
The experience is really interesting. It is very useful when such tasks arrive, especially when the deadlines are also running out. But since I have been ordering production on PCBWay.ru for more than a year now, mistakes can be avoided. What is surprising, but engineers give advice on how to make it more correct, more beautiful and even cheaper.
Source - https://tehnopage.ru/flex-pcb
Development and transfer to production of a flexible printed circuit board
*PCBWay community is a shared platform and we are not responsible for any design issues.
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