PCB has been able to get more and more widely used, because it has many unique advantages, as follows.
Can be high density. For decades, PCB density has evolved with the integration of integrated circuits and the development of technological advances.
High reliability. Through a series of inspection, testing and aging tests can ensure long-term PCB (use period, usually 20 years) and reliable work.
Designable. On the PCB a variety of performance (electrical, physical, chemical, mechanical, etc.) requirements, through the design of standardized, standardized, etc. to achieve PCB design, time is short, high efficiency.
Productivity. The use of modern management, can be standardized, size (volume), PCB automation and other production, to ensure product quality consistency.
Testability. The establishment of a relatively complete test methods, test standards, a variety of test equipment and instruments to detect and identify PCB product qualification and service life.
Can be assembled. PCB products are easy to standardize the assembly of various components, but also can be automated, large-scale production. At the same time, PCB and various component assembly parts can also be assembled to form larger parts, the system, until the machine.
Maintainability. As PCB products and various components of the assembly components are standardized design and large-scale production, so these components are standardized. Therefore, PCB once the system fails, you can quickly, easily and flexibly replace, quickly restore the system work. Of course, you can also put more examples. Such as the system miniaturization, lightweight, high-speed signal transmission and so on.
PCB in the circuit board, it refers to the manufacture of circuit board materials used, including the substrate, substrate parameters, technology and so on. Mainly refers to the substrate, PCB copper foil and adhesive composition of CCL (copper) quality.
PCB is the main material from the substrate, copper foil and adhesive composition of the CCL (copper). The substrate is composed of a polymer resin and a reinforcing material. The surface of the substrate is covered with a layer of pure copper foil with high conductivity and good weldability. The thickness is 35 ~ 50 / ma. The copper foil is covered with the substrate One side of the CCL is called single-sided copper clad laminate, both sides of the substrate are covered with copper clad copper clad, said double-sided CCL; PCB copper can be firmly covered on the substrate, by the adhesive to complete. Common CCL thickness of 1.0mm, 1.5mm and 2.0mm three.
CCL types are also more. According to the different insulation materials can be divided into paper substrate, glass cloth substrate and synthetic fiber board; PCB according to the binder resin is divided into different phenolic, epoxy, polyester and polytetrafluoroethylene; by use can be divided into general and special type The