FPC connectors are characterized by high cable density, light weight and thinness, so they are called flexible circuit boards, flexible printed circuit boards or flexible circuit boards. Most FPC connectors are made of polyimide (PI) or polyethylene terephthalate (PET), which improves the reliability of FPC connectors.
FPC connectors will vary depending on how the raw materials and copper cladding are connected. Therefore, FPC can be divided into two main types: 3-layer FCCL and 2-layer FCCL.
The 2-layer FCCL has greater flexibility, and the raw material 2-layer FCCL is too expensive to use on the market. In contrast, the 3-layer FCCL is much cheaper and is usually used on the market. However, the flexibility and flatness parameters of the mat are not as good as the 2-layer FCCL, so there may be welding defects such as cracks, which manufacturers should try to avoid.
Since 3-layer FCCL is more prevalent in the market, more and more connector manufacturers adopt it and it is better developed. Different types of FCCL can be classified according to the number of layers of copper foil, including multi-layer boards, double-layer boards, single-layer boards and double-layer boards.
The single layer board has the simplest structure. Connector manufacturers typically use structures that include raw materials, clear plastics, and copper foil. Some FPC connector manufacturers use a layer of protective plastic and transparent plastic. This structure can greatly improve the mechanical strength of the 3-layer FCCL.
The two-layer structure is used for complex circuits that cannot be wired or shielded. The multi-layer board is different from the single-layer board in the VIA structure, and can effectively connect different layers of copper foil. Double-sided two-sided soldering, mainly used to connect other boards. In addition, the FPC connector can be applied to MP3 and MP4 players, digital cameras, mobile phones and mobile phone batteries, and the future development of FPC connectors is very good.
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