rigid flex boards be used in robotics
Rigid-flex boards combine rigid sections with flexible circuits that bend and twist, allowing the board to adapt to unique product shapes and fits. They can be used in a variety of applications, including robotics.
These unique PCBs are designed in 3D, which offers greater spatial efficiency than standard rigid PCB designs. The rigid portions of the board use traditional FR-4 laminates or flexible circuit materials like polyimide (Kapton) with rolled annealed copper foil. Conductive traces are bonded to these substrates using adhesives. Then, coverlay and stiffener materials add insulating layers and protect the circuits.
For rigid-flex PCBs, etching processes produce the desired pad and via patterns on both sides of the lamination. A photosensitive etch resist is applied to the laminate and exposed with the correct pattern, before being chemically etched. Copper is then deposited through these holes to establish electrical connections between the rigid and flex sections.
Can rigid flex boards be used in robotics?
Rigid flex boards must be properly assembled to ensure long-term reliability. To achieve this, the manufacturer must perform rigorous quality assurance and testing. Incoming components must be checked for accuracy and quality, while the manufacturing process is monitored to ensure temperature and pressure profiles are within specifications. This prevents delamination and other problems.
Once the rigid-flex boards have been assembled, they must be tested for functionality. This testing can include a bending test, a stress test and an environmental test. These tests are performed to ensure that the boards can withstand the rigors of the application, and to identify any potential issues that need to be corrected.
To avoid damage to the flexible areas, rigid flex board require a minimum bend radius of 10 times the width of the conductor. The flex portions should also be supported by pads to avoid pulling stresses that may separate the copper from the polyimide substrate. Additionally, it is important to avoid bending copper traces on corners or edges as this can cause them to break off and smudge the surface.
To ensure that rigid-flex PCBs can meet the requirements of the application, manufacturers should select suppliers with extensive experience and proven design capabilities. They should be capable of integrating the required flex circuits with the rigid sections, and have robust manufacturing processes that minimize delamination and other defects. Incoming materials, laminations and adhesives should be inspected for conformance to specification, and a process monitoring system is recommended to monitor the conditions that affect the quality of the final assembly.
This can include variables such as lamination temperature and pressure, etchant concentrations, and plating thickness. Statistically-representative quality acceptance sampling should be conducted for the circuits, pads and vias to ensure they have the right physical dimensions and are free from shorts, opens and other hidden defects. In addition, the supplier should have a strong commitment to reducing the overall costs of the finished product. This can be accomplished through design and engineering optimization, streamlined manufacturing processes, and by purchasing the highest-quality materials available. These steps are essential to ensuring that rigid-flex PCBs meet the performance, size and weight needs of the robotics industry.