Advantages And Effects Of Flexible Circuit Boards

Flexible circuit boards

First, the flexibility and reliability of flexible boards

Four flexible circuit boards are currently commonly used: single-sided, double-sided, multi-layer and rigid-flexible combinations. “Single-sided flexible boards have the lowest cost. When electrical performance is not critical and can be routed on one side, single-sided flexible boards should be used.” This most common form has been commercialized, such as printer inkjet cartridges and computer memory. The single-sided flexible board has a chemically etched conductive pattern, and the conductive pattern layer on the surface of the flexible insulating substrate is a rolled copper foil. The insulating substrate used as the flexible component may be polyimide (Kapton), polyethylene terephthalate (PET), aramid fiber paper (Nomex), and polyvinyl chloride (PVC).

The double-sided flexible board has a conductive pattern formed by etching each of both sides of the base film. Metallized holes connect the sides of the insulating material to form a conductive path to meet the bending design and function of use. The cover film protects single-sided and double-sided wires and indicates where the components are placed.

The multilayer flexible board is formed by laminating three or more single-sided flexible circuit boards or double-sided flexible circuit boards and forming metallized holes by drilling and plating to form a conductive path between the different layers. This eliminates the need for complex welding processes. Although the number of conductive layers designed to be of this flexible type can be infinite, in order to ensure ease of assembly when designing the layout, the interaction of component size, number of layers and flexibility should be considered.

Second, the economics of flexible circuit boards

If the design of the circuit is relatively simple, the total volume is small, and the space is appropriate, the traditional internal connection method is the most cost-effective. Flexible circuit boards are a good design choice if wiring is complex, handling many signals or having special electrical or mechanical performance requirements. The potential cost savings of flexible materials compared to rigid materials is the elimination of connectors. Raw material costs are the main reason for the high price of flexible circuit boards. Despite its expensive materials and cumbersome manufacturing, the foldable, bendable and multi-layer panel features reduce overall component size, reduce material usage and reduce overall assembly costs.