Flexibility and Reliability Design of PCB

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There are two types of designs - static and dynamic. Static design refers to bending or folding that occurs only during assembly or rarely during use. Dynamic circuits, on the other hand, are designed for repeated bending throughout the product's life.

For the static design, the bend radius of the fold should be at least ten times the thickness of the entire circuit. For double-sided circuits, all copper traces should be placed on the same side of the substrate film in the folded region. For dynamic circuits, the relevant part should be designed as a single-sided circuit with copper on the central axis.

Multi-layer circuits that require high dynamic bending cycles and high densities can be achieved by connecting double-sided or multilayer circuits to single-sided circuits using anisotropic adhesives.

Flexibility and Reliability Design of PCB

To ensure the reliable operation of the finished circuit, several factors must be considered during the design process. These include selecting circuits with two or more layers for plating, keeping the minimum number of bends, staggering wires, avoiding pads or through holes in the bend area, and not placing ceramic devices near any bend areas to avoid discontinuities in the coating or plating.

In addition, the thickness and width of the conductor should remain constant in the bend area, and a long and narrow cut can be made to allow different wooden supports to bend in different directions. However, this incision can be prone to tearing, which can be prevented by making a drill hole at the end of the incision, using a rigid plate or a thick piece of flexible material or PTFE.

Overall, the design process should take into account the specific requirements of the flexible printed circuit and its intended use to ensure reliable operation.

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