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What are the four common flexible circuit boards?

Industry News|2022-03-12| admin

  Flexible Printed Circuit (FPC) is a 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 tortuousness. Today, I will introduce to you four common flexible circuit boards?.

  1. Single-sided flexible board

  lowest cost. When the electrical function requirements are not high and single-sided wiring can be used, a single-sided flexible board should be used. The most common form is already used commercially, such as printer inkjet cartridges and computer memory. The single-sided flexible board has a layer of chemically etched conductive pattern, and the conductive pattern layer on the outer surface of the flexible insulating substrate is a rolled copper foil. Insulation substrates for flexible installation can be polyimide (Kapton), polyethylene terephthalate (PET), aramid fiber paper (Nomex) and polyvinyl chloride (PVC).

  2. Double-sided flexible board

  The double-sided flexible board is a conductive pattern formed by etching on both sides of the base film. The metallized holes connect the patterns on both sides of the insulating material to form a conductive path, which satisfies the flexibility of design and application functions. Cover films maintain single- and double-sided conductors and indicate the location of components.

  3. Multilayer flexible board

  The multi-layer flexible board is to laminate three or more single-sided flexible circuit boards or double-sided flexible circuit boards together, form metallized holes through drilling and electroplating, and form conductive paths between different layers. In this way, complex welding processes are not required. While the number of conductive layers designed for this type of flexibility can be infinite, to ensure ease of assembly, the interplay between assembly size, number of layers, and flexibility should be considered in the layout design.

  4. Rigid-flexible combination type

  Traditional rigid-flex boards are composed of rigid and flexible substrates selectively laminated together. The structure is compact, and the conductive connection is formed by metallized holes. Factories should try to keep the number of layers as low as possible, considering reliability and price factors.

  HDI rigid-flex board: High-density interconnect (HDI) rigid-flex printed circuit board is a high-end printed circuit board product. Its goal is to meet the needs of electronic products in the direction of miniaturization, high frequency, high speed and multi-function. HDI rigid-flex composite board combines the advantages of the popular HDI board and rigid-flex composite board, which promotes the development of high integration and high intelligence in the design and production of electronic systems, and has been widely used in aerospace, medical equipment, consumer and other high-end electronics in the product.

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