The flexible P-colored B-B, commonly known as Flex PCB, consists of an insulating polyimide film and printed circuit pattern. Polyimides are insulators, so the path can only be completed if the circuit pattern is conductive. Just like the “welding mask” of a rigid PCB, a flexible PCB is covered with a thin “overlay” that insulates the circuit from any electromagnetic interference. Flex PCB are now common in smartphone and medical applications, especially when circuits are subjected to severe temperature changes while remaining flexible.

Flexible PCBS are considered “flexible” for many different reasons. The most obvious is that their circuitry can be adjusted to match the product itself. This is particularly beneficial when it comes to parameters such as sustainability, durability, low weight and flexibility. Traditional circuit boards cannot meet the same standards of durability, fragility and efficiency.

Flexible boards are superior to traditional rigid boards when it comes to product limitations. For example, using a flexible PCB instead of a rigid one can significantly reduce the size of the product. They can be bent and flipped to adjust to the core product. The entire product can be made lighter using the same components as the rigid and heavy components. However, flexible plates are not completely flexible. These PCBS do have some rigid areas, but the circuitry is mainly mounted on flexible parts, so it can be adjusted according to the product. Keep the rigid parts used for material support so it is kept to the lowest possible level.

1. Construction:

A flexible PCB that may correspond to its rigidity may be constructed in a number of different ways. According to technology, level and material, we classify them as follows:

Single-sided flexible circuit (SSFC) consists of a single conductive layer consisting of a metal or metal-filled polymer on a flexible dielectric film; Normally polyimide it uses the THT (through-hole) mechanism to mount the component, which means you can use one side to adjust and change the component. Single-sided flexible PCB with or without shielding coating can be manufactured using insulating film; However, the use of a shielding coating on the circuit is the most common practice because it mechanically prevents the circuit and any EMI. The structure and insulation of a single-layer flexible PCB are explained as follows:

Sculpted flexible PCB is an attractive subset of flexible PCB, the present invention relates to a particular flexible manufacturing method that produces a flexible circuit with copper conductors of varying thickness along its length. The conductor is thinner in the flexible region and thicker in the rigid region. This method involves selective etching of copper foil to obtain depth in various areas of the circuit.

Engraving flexible PCB techniques are often chosen to generate bare metal contacts to make this possible. Extends from the edge to the plug-in connection. The increased area makes the solder joints more stable and durable than ordinary flexible circuits.

Multilayer flexible PCB consists of the same flexible circuit with multiple layers. These layers are connected by flat plates. The layers of a multi-layer flexible PCB are continuously laminated through holes. These multilayer PCBS are similar to rigid multilayer PCBS except for variations in material, quality, characteristics, and cost. Multi-layer flexible circuits are more expensive than their counterparts, but ensure better quality. Below is a visualization of a multi-layer PCB.

The only strict part is the part used for joining. The rest of the circuit board is flexible.

2. Application:

Flexible PCBS are used in the following areas:

Flexible printed circuit boards are often used when reliability, adaptability and lightweight products are needed, as in the case of medical devices. A swallowing camera Pill called the Pill Cam uses a very thin flexible circuit that must be properly insulated and durable. After swallowing the pill, doctors and professionals can accurately view the tissue from inside the body. The pills need to be very small and must move flexibly through the body, so flexible PCBS are a perfect choice, unlike rigid and brittle ones.

B) Smart phones:

The demand for “smart” phones requires mobile devices to be made up of small components and flexible circuits. Thus, flexible PCBS play a vital role in circuits used in some significant parts of the circuit, such as “power amplifiers”. So phones can be smart and lightweight.

C) Computer Electronics:

The electronic products in the motherboard are the core and soul of the modern computer. Circuit design should be implemented in a small, concise way. Therefore, flexible circuit boards are used to keep everything sustainable and small.