Flexible PCB Used in Flexible Strain Sensors

Flexible PCB Used in Flexible Strain

Modern electronics manufacturers face a number of contradictory requirements when integrating circuits into finished applications. They must produce devices that are light in weight, rugged enough to withstand heat, vibration, and moving parts, and affordable to manufacture. At the same time, production schedules demand rapid prototyping and implementation, while quality assurance demands repeatability and consistency in manufacturing.

Flexible PCBs can help to meet these challenges, allowing companies to develop lighter and more durable products that are easier and faster to assemble. Unlike rigid PCBs, flexible boards can be bent and flexed without damage. This allows for more space for components and can reduce the number of errors during assembly. Moreover, they are also able to fit in smaller spaces, which can help to cut costs by reducing the size of the final product.

One of the most common uses for flexible pcb is in medical devices, where they can help to prevent mechanical damage and provide a better chance of diagnosing conditions. They can also be used in aerospace and military applications, where the equipment must continue to function on demand and cannot be shut down for any length of time. These types of printed circuit boards typically require a high level of testing, inspection, and performance.

Using a flex circuit board can reduce assembly time, routing errors, rejects, and rework, as well as lower the cost of labor. Additionally, a flex PCB can reduce the amount of material needed to build a device, making it a more environmentally-friendly choice. Furthermore, it can be used in place of traditional conductive materials such as copper, thereby lowering production costs.

Flexible PCB Used in Flexible Strain Sensors

The underlying structure of a flex circuit board is similar to a standard rigid printed circuit board, but it is constructed with flexible polyimide layers. This helps to make it more flexible, while also providing thermal stability and electrical insulation. In addition, it is much thinner than a rigid PCB, which can enable it to be more easily manipulated into tight spaces.

In this study, the flexible pcb was subjected to various strain conditions, including small tensile and compressive strains. The results showed that the flex circuit board had excellent strain tolerance with a sensitivity of up to 95%. This was mainly due to the fact that it had parallel concave lines perpendicular to the strain, which resulted in a more rapid decrease in conductive paths.

However, it is important to note that flex circuit boards may not be suitable for all applications. For example, they may not be suited for high-density surface mount components or a large number of plated through holes. They are also prone to damage during transport and handling, which can lead to costly downtime and repair. In order to protect the flex circuit boards from damage, it is recommended that they be stored in an environment with low humidity and in a protective bag. In addition, the manufacturer can add a cover lay or solder mask to certain areas of the flex circuit board to prevent them from being exposed during use.

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