Flexible Printed Circuit (FPC for short) is a highly reliable 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 bendability.

　　1, short: short assembly time

　　All lines are configured, eliminating the need to connect redundant cables;

　　2, small: the volume is smaller than the PCB circuit board

　　can effectively reduce the product volume and increase the convenience of carrying;

　　3, light: weight is lighter than PCB circuit board (hard board)

　　can reduce the weight of the final product;

　　4, thin: thickness is thinner than PCB circuit board

　　can improve the softness and strengthen the three-dimensional assembly in a limited space.

　　Six-layer FPC (FPC flexible circuit board)

　　FPC flexible circuit board is a printed circuit made of flexible insulating substrate, which has many advantages that rigid printed circuit boards do not have:

　　(1) It can be bent, wound, and folded freely, can be arranged arbitrarily according to the space layout requirements, and can be moved and stretched arbitrarily in three-dimensional space, so as to achieve the integration of electronic component assembly and wire connection;

　　(2) The use of FPC flexible circuit boards can greatly reduce the volume and weight of electronic products, and is suitable for the development of electronic products in the direction of high density, miniaturization and high reliability. Therefore, FPC has been widely used in aerospace, military, mobile communications, laptop computers, computer peripherals, PDAs, digital cameras and other fields or products;

　　(3) FPC also has the advantages of good heat dissipation and solderability, easy assembly and connection, and low overall cost. The design of the soft and hard combination of FPC also makes up for the slight deficiency of the flexible substrate in the component carrying capacity to a certain extent. .

　　(1) One-time high initial cost: Since FPC flexible circuit boards are designed and manufactured for special applications, the initial circuit design, wiring and photographic masters require higher costs. Unless there is a special need to apply flexible PCB circuit boards, it is usually best not to use it in a small number of applications;

　　(2) It is difficult to modify and repair flexible PCBs: once the FPC flexible circuit board is manufactured, the modification must start from the base map or the programmed light drawing program, so it is not easy to modify. The surface is covered with a protective film, which must be removed before repair and restored after repair, which is a relatively difficult task;

　　(3) Size is restricted: FPC flexible circuit boards are usually manufactured by batch process when they are not yet common, so they cannot be made very long and very wide due to the limitation of the size of the production equipment;

　　(4) Improper operation and easy damage: Improper operation by the installation and connection personnel can easily cause damage to the soft circuit, and the soldering and rework need to be operated by trained personnel.

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