Printed circuit boards can be divided into rigid printed boards and flexible printed boards according to the production materials. Rigid printed boards are phenolic paper laminates, epoxy paper laminates, polyester glass felt laminates, epoxy glass cloth laminates. Flexible printed circuit board, also known as flexible printed circuit board or FPC flexible circuit board, flexible circuit board is made of polyimide or polyester film as a base material with high reliability and high flexibility. Sexual printed circuit board. The circuit board has good heat dissipation, and can be bent, folded, and rolled, and can be moved and stretched freely in three-dimensional space. FPC can be used to reduce the volume, realize light weight, miniaturization and thinning, so as to realize the integration of component device and wire connection. FPC flexible circuit boards are widely used in electronic computers, communications, aerospace and home appliances and other industries.

　　Features of flexible circuit board:

　　(1) Low cost.

　　(2) Continuity of processing.

　　(3) FPC is conducive to thermal diffusion.

　　(4) FPC is small in size and light in weight.

　　(5) FPC can be moved, bent and twisted.

　　(6) FPC can be installed with three-position connection.

　　(7) FPC has high assembly reliability and assembly operability.

　　(8) FPC flexible circuit board has excellent electrical properties, dielectric properties and heat resistance.

　　Flexible circuit board product features:

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

　　The product is small in size and light in weight, which greatly reduces the size of the device, and is suitable for the development of electronic products in the direction of high density, miniaturization, light weight, thinning and high reliability. With high flexibility, it can be freely bent, rolled, twisted, folded, and can be wired in three-dimensionally. integration.

　　It has excellent electrical properties, high temperature resistance and flame resistance. The chemical change is stable, the stability is good, and the reliability is high. It has higher assembly reliability, provides convenience for circuit design, and can greatly reduce the assembly workload, and it is easy to ensure the performance of the circuit, so that the cost of the whole machine is reduced. Additional mechanical stability is achieved by increasing its strength by using reinforcing materials. The design of the combination of soft and hard also makes up for the slight deficiency of the flexible substrate in the component bearing capacity to a certain extent.

　　Rigid circuit board features:

　　High density is possible. For more than 100 years, the high density of printed boards has been able to develop with the improvement of integrated circuit integration and the advancement of mounting technology.

　　producibility. With modern management, standardization, scale (quantification), automation and other production can be carried out to ensure the consistency of product quality.

　　High reliability. Through a series of inspections, tests and aging tests, the PCB can be guaranteed to work reliably for a long time (usage period, generally 20 years).

　　Testability. A relatively complete test method, test standard, various test equipment and instruments have been established to detect and identify the qualification and service life of PCB products.

　　Designability. For the various performance requirements of the PCB (electrical, physical, chemical, mechanical, etc.), the printed board design can be realized through design standardization and standardization, with short time and high efficiency.

　　Rigid circuit board function:

　　After the electronic equipment adopts the printed board, due to the consistency of the same type of printed board, the error of manual wiring is avoided, and the automatic insertion or mounting of electronic components, automatic soldering, and automatic detection can be realized, which ensures the quality of the electronic equipment. , improve labor productivity, reduce costs, and facilitate maintenance.

　　The difference between flexible circuit board and rigid circuit board:

　　Rigid circuit boards and flexible circuit boards have both similarities and differences before. For flexible circuit boards, rigid circuit boards are more widely used. Because rigid circuit boards appeared earlier, most of the design elements of rigid circuit boards have been applied in the design of flexible circuit boards. What is the difference between flexible circuit boards?

　　1. Flexibility: The flexibility of rigid circuit boards is of course not comparable to that of flexible circuit boards. For a large number of bending cycles, flexible circuit boards have better performance.

　　2. Shape. In general, a rectangle is selected, which can save the substrate very well, and there should be enough free margins near the edge. A sharp inner corner may cause tearing of the board. Therefore, the smaller wire width and spacing should be minimized as much as possible, and the transition must be as smooth as possible. Sharp corners will naturally concentrate stress and cause wire failure.

　　3. Current-carrying capacity of wires: Compared with rigid circuit boards, the heat dissipation performance of flexible circuit boards is relatively poor, so sufficient wire width must be provided. Due to the heat dissipation of the flexible circuit board, it is necessary to give extra width or spacing to the wires.

Read recommendations:

High frequency PCB

Six-layer Immersion Gold Board (BGA)

Mobile phone board

DIP plugin

Circuit board burn-in test method and general tutorial