What are the four common types of flexible circuit boards?
Flexible printed circuit (FPC) is a kind of high reliability and excellent flexible printed circuit board made of polyimide or polyester film. It has the characteristics of high wiring density, light weight, thin thickness, and good flexibility.
1. Single sided flexible board
Lowest cost. When the electrical performance requirements are not high and single sided wiring can be used, a single sided flexible board should be selected. This most common form has been commercialized, such as printer ink cartridges and computer memory. The single-sided flexible board has a layer of chemically etched conductive patterns, and the conductive pattern layer on the surface of the flexible insulation substrate is rolled copper foil. The insulating substrates for flexible PCB assembly can be polyimide (Kapton), polyethylene terephthalate (PET), aramid fiber paper (Nomex) and polyvinyl chloride (PVC).
2. Double sided flexible board
A double-sided flexible board is a conductive pattern formed by etching on both sides of the substrate film. The metallized holes connect the patterns on both sides of the insulation material, forming a conductive path that meets the flexibility of design and usage functions. Covering film can protect single and double sided wires and indicate the position of components.
3. Multi layer flexible board
Multilayer flexible boards are three or more layers of single-sided or double-sided flexible circuit boards that are laminated together, forming metallized holes through drilling and electroplating, and forming conductive paths between different layers. In this way, there is no need for complex welding processes. Although the number of conductive layers designed for this flexible type can be infinite, in order to ensure convenient assembly, the interaction between assembly size, number of layers, and flexibility should be considered in layout design.
4. Rigidity deflection combination type
Traditional rigid and flexible plates are composed of rigid and flexible substrates that are selectively pressed together. Tightly structured, with metallized holes forming conductive connections. Considering reliability and price factors, manufacturers should try to maintain as few layers as possible.
HDI rigid flexible combination board: High density interconnect (HDI) rigid flexible combination printed circuit board is a high-end printed circuit board product. Its goal is to meet the needs of electronic products towards miniaturization, high-frequency, high-speed, and multifunctional development. HDI rigid flexible composite boards combine the advantages of popular HDI boards and rigid flexible composite boards, promoting the high integration and intelligent development of electronic system design and production. They have been widely used in high-end electronic products such as aerospace, medical equipment, and consumer electronics.
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