Flexible PCBs
As the world of electronics becomes more sophisticated, consumers demand smaller devices that can be held in one hand. This is where flexible circuit boards can provide a solution by making products more compact without sacrificing reliability and function. They also allow manufacturers to save costs by eliminating steps in assembly such as wire soldering and connector assembly.
The most popular application for flexible pcbs is in consumer electronics like computers, mobile phones and MP3 players. Their flexibility allows designers to build more intricate designs that are lighter and thinner than conventional rigid PCBs. They are also more resistant to vibration and shock, meaning they can be used in mobile devices that must withstand the movement of the body.
They are also ideal for use in medical and military equipment. Because they are durable, lightweight and resistant to heat, chemicals, and radiation, they can be used in devices that monitor and control vital signs such as blood pressure or heartbeat, or deliver medication to a patient’s body. In addition, they can be shaped to fit in areas where space is limited and are highly adaptable to the varying sizes of different medical equipment.
Flexible PCBs in Different Industries
Flex PCBs can be manufactured in a range of thicknesses and constructions, from single-layer to multiple-layered with or without stiffener. Depending on the industry and product design, they can be made with either copper or gold conductors with a dielectric material such as Polyimide or FR-4. The dielectric layer protects the copper from corrosion and serves as an insulator to prevent signals from escaping through holes in the circuit board. In order to bond the conductors to the dielectric, manufacturers utilize a special adhesive that is not affected by temperatures.
Since they are able to bend and fold, flex circuits can be used in a variety of shapes and have been seen in the designs of smartphones with flexible screens. They are also able to be incorporated into automotive dashboards, rear-view camera displays and air-bag systems, where they offer advantages in terms of thermal performance, space allotment and shape flexibility.
In industrial and commercial applications, flex PCBs are commonly used where the equipment must be able to endure extreme movements, rapid pressure, or high temperatures over extended periods of time. This is particularly true of machinery and products where equipment downtime is not an option, such as aircraft missile-launch detectors or life support equipment. In these situations, rigid PCBs are not able to withstand the stress of vibration, movement or temperature fluctuations and are prone to warping and delamination.
Flex PCBs, on the other hand, are able to endure this type of stress and are designed for maximum reliability. They are often referred to as military-grade flex boards and meet stringent inspection, testing and performance standards. They are also more expensive than standard rigid PCBs but are worth the investment for demanding applications.
