Issue link: https://iconnect007.uberflip.com/i/1507356
SEPTEMBER 2023 I DESIGN007 MAGAZINE 71 are craed to precisely fit the device they are intended for instead of requiring the device be altered to fit the circuitry. At the same time, they are designed with the same constraints as a regu- lar PCB for signal performance and EMI control. Rigid-flex boards provide precision fit, dura- bility, space and weight reduction, and bet- ter performance and reliability. It is tempting to use the phrase, "It really is a dream come true." However, the importance of rigid- flex circuitry in today's electronics is very real and has some very impor- tant shoes to fill. One of the most mission-critical uses of rigid-flex PCBs can be found in the medical field. Consider the importance of these medi- cal devices in use today that incorporate flex technology within their designs: • Scanners: Rigid-flex PCBs give ultrasound, MRI, and CT scanners the ability to be positioned correctly for diagnosing a patient. Not only is the PCB able to move as required, but the flexible portion of the design allows for placement of the device within tight areas, while the rigid sections contain the components necessary for processing. • Diagnostic equipment: Depending on the application, diagnostic equipment can connect multiple sensors to their data processors. For large pieces of equipment, flex circuitry saves space over traditional cabling, while the flexible nature of the circuits allows for compact design of smaller hand-held units. • Surgical instruments: Going beyond the traditional scalpel, modern surgical proce- dures utilize high-technology equipment such as cameras and robotics. Rigid-flex circuitry is essential for motor control and video communication and processing. • Defibrillators and pacemakers: Implant- able medical devices need to be able to conform to the shape and contours of a patient's body. Rigid-flex circuitry allows for this while delivering the performance and durability that is essential for the environment that these life-saving devices are operating in. No matter what, necessity will keep driving invention. But who knows what direc- tions this invention will take once it is coupled with human ingenuity? I'm still waiting for neural interfaces on my CAD applica- tions so I can route traces with my mind without ever touching the mouse. In the mean- time, there are so many new and wonderful inventions hap- pening within our industry. If you haven't designed a rigid-flex board yet, chances are you will soon. I'm looking forward to reading more from the experts in this issue about the pros, cons, challenges, and bene- fits of working with rigid-flex PCBs. If you've got questions, this is a great place to start, and I'm looking forward to seeing what they have to say. Until next time, keep on designing. DESIGN007 Tim Haag writes technical, thought-leadership content for First Page Sage on his longtime career as a PCB designer and EDA technologist. To read past columns, click here. Rigid-flex boards provide precision fit, durability, space and weight reduction, and better perfor- mance and reliability.