Flexible PCBs are thin and light-weight electrical circuits. These circuits can fit in contoured shapes and in small or limited space. It is made up of conductive strips of copper encapsulated within an insulating dielectric material. It is mainly used as an electronic interconnection device which is used to carry electronic signals and power. Flex PCBs came as a replacement for traditional circuits. This is the circuit that allow electronic goods to become smaller and lighter.
Choose the leaders
There are suppliers who develop different kinds of flex PCBs to cater to the requirements of various sectors. Capel Technology is one such PCB manufacturer who offer multiple flexible circuit , single layer flex, double sided flex circuits, rigid flex circuits and sub-assemblies. They also help you to find other associates who can address your additional requirements.
About multi-layer flex circuits
A multi-layer flex circuit is made by combining a number of single-sided or double-sided circuits. It involves complex interconnections, shielding and surface mounted technologies. The surface mount technology helps a multiple flexible circuit to obtain high-density interconnections. However, it may or may not be laminated throughout the production cycle. It is an effective solution for certain design challenges like
2.Specific impedance requirements
3.Elimination of cross talk
5.High component density
It is made up of namely four basic elements consisting of conductors, insulators, adhesives and finishes.
Why use multi-layer flex circuits
Saves cost and time
Designing and manufacturing of multi-layer flex PCBs needs less manual labor which in turn reduces any possibility of production errors. It does not require any expensive soldering wires, routing and wrapping. With multi-layer flex circuits the whole interconnection systems are replaced or installed instead of changing or installing discrete hard PCBs. As a result, the wiring errors minimize and the manufacturing cost gets reduced.
Increased heat dissipation
The surface-to-volume ratio of multi-layer flex PCB is quite high allowing a shorter thermal path. Besides, the slim design also helps to increase heat dissipation through the walls of the circuits.
Reduced package size and weight
As multi-layer flex circuits have the thinnest dielectric substrates, it provides more streamlined design. That is why such PCBs are light in weight and requires less space.
Designs which have moving parts, this type of circuits are most suitable as it is capable of flexing 500 million times. The most commonly used material in flex circuit board is Polyimide which has an outstanding thermal strength. Due to the outstanding thermal strength of polyimide, better quality board is obtained for surface mounting when compared to a hard board. This allows multi-layer flex circuits to withstand high temperatures.
Improves system reliability
Previously, most of the failures in circuits used to occur at the point of interconnection. The multi-layer boards eliminate the need for interconnections improving the reliability of the circuits.
Multiple flexible circuits can be used in both static and dynamic flexing appliances. Some of these include cameras, satellites, hearing aids, air bag systems, heart monitors, pacemakers, cell phones, GPS system, bar code equipment and avionics. Because of the advantages, such PCBs are widely used in various applications.