PCB rigid flex improve design flexibility
PCB rigid flex is a combination of rigid and flexible sections that can help with design flexibility, reliability and signal integrity. It can also help reduce package size and weight, making it a suitable option for products that need to save space or withstand harsh conditions, such as medical imaging equipment, military missile guidance systems, automobiles, wearable electronics and more.
Rigid flex is typically made from materials such as FR-4, polyimide or specialized Rogers-based laminates, while the flexible section uses materials like a polyimide (Kapton) or polyester (PET). Conductive traces are made of copper foil and laminated to the substrates with adhesive and coverlay layers for bonding and protection. The resulting rigid-flex circuit board can be manufactured using various fabrication techniques, depending on the product.
In addition to the material selection, pcb rigid flex requires careful design considerations. Unlike traditional PCBs, which can be fabricated without compromising electrical performance, rigid-flex designs need to meet special requirements to ensure that the rigid and flex sections work together seamlessly. This includes the use of matched-length copper foils for critical signals and maintaining a consistent signal propagation speed throughout the PCB.
How can PCB rigid flex improve design flexibility?
Another important consideration for a rigid-flex circuit is the number of layers. Keeping the layer count low can help to minimize manufacturing costs and lead times. This is because a higher layer count will require more time, materials and expertise to laminate, drill, etch and finish. It can also impact panel utilization, limiting the amount of components that can fit on a production panel. Additionally, it can increase the chance of plating errors and the need for re-laminate.
Rigid-flex PCBs also need to consider the effect of temperature variations on both the flex and rigid sections. This is important because the varying thermal expansion coefficients can impact the stability of the circuit. The location of connectors between the flex and rigid sections is also important, as this can affect signal quality, electromagnetic interference (EMI) and mechanical stress.
Other important factors for a rigid-flex circuit board include its bend capabilities, power and ground planes and blind or buried vias. For example, the choice of whether to utilize solid or hatched copper pours can have significant impacts on the bending performance of a PCB. Hatched copper pours offer less biased copper stresses in 0°, 90° and 45° angle directions, improving flex performance.
Choosing a rigid-flex PCB design with the right features can make all the difference for your project. A PCB manufacturer with experience designing and fabricating rigid-flex boards can provide advice on the best construction to suit your design, application and environment.
If you are interested in working with a leading PCB manufacturer that offers both rigid-flex and traditional PCBs, contact Viasion Technology today for a free quote. We can provide expert fabrication services with short lead times, and can help you achieve your product’s technical and cost goals. We have a broad range of technologies, including rigid-flex and SMART PCBs, so we are confident that we can help you find the right solution for your project.
