PCB, as the "mother of electronic products", is a bridge that carries electronic components and connects circuits. It is widely used in communications, consumer electronics, computers, automotive electronics, industrial control, medical equipment, national defense, aerospace and other fields. It is a modern electronics indispensable electronic components in information products. It is a provider of electrical connections for electronic components. The downstream of the PCB industry covers almost all electrical circuit products, and the core applications with the largest output value include communication equipment, computers, consumer electronics and automotive electronics. With the development of electrification and automation in human society, the application range of PCB is becoming wider and wider, and there are no other substitutes for the time being. 1. Classification according to the strength of PCB substrate (1) Rigid printed boards Printed boards made of rigid substrates; (2) Flexible printed boards Printed boards made of flexible substrates, also known as flexible printed boards; (3) Rigid and flexible printed boards are printed boards made by using flexible substrates and combining them with rigid substrates in different areas. 2. Classification according to the method of making conductive patterns on PCB circuit boards (1) Subtractive PCB Printed circuit boards made by subtractive technology; (2)Additive PCB Printed circuit boards produced by the additive process. 3. According to the PCB circuit board substrate classification (1)Organic printed boards. Conventional printed boards are all organic printed boards, which are mainly composed of three materials: resin, reinforcing materials and copper foil. Resin materials include phenolic resin, epoxy resin, polyimide, /A resin, etc.; (2)Inorganic printed boards are commonly referred to as thick film circuits, which are composed of ceramics, metal aluminum and other materials. Inorganic printed boards are widely used in high-frequency electronic instruments. 4. Classification according to the conductive structure of the PCB circuit board (1)Single-sided printed circuit board refers to a printed circuit board with conductive patterns on only one side. Because the wires only appear on one side, this kind of printed circuit board is called a single-sided printed circuit board. (Referred to as single panel) (2)A printed board with conductive patterns on both sides of the double-sided printed board, because the area of the double-sided board is twice as large as that of the single-sided board, and the wiring can be staggered (it can be wound to the other side), which is more suitable for more complex On the circuit. (3)Multi-layer printed board A printed board made of 3 or more layers of conductive patterns and insulating materials alternately bonded together and laminated, referred to as a multilayer board, requires the conductive patterns between layers to be connected to each other as needed...

PCB refers to a printed board on a general base material that forms connection between points and printed components according to a predetermined design. Its main function is to make various electronic components form a predetermined circuit connection, which plays a role of relay transmission and is an important electronic component. It is the support of electronic components and the carrier of electrical connection of electronic components. With the iteration of 5G technology, the product structure of PCBs has also differentiated. Multilayer boards still occupy the mainstream position in the PCB market. With the rapid development of electronic circuit industry technology, the integrated functions of components are becoming more and more extensive, and electronic products have more high-density requirements for PCBs. In order to highlight, high-end PCB products such as high-multilayer boards, flexible boards, HDI boards and packaging substrates have gradually occupied a leading position in the market. With the development of electrification and automation in human society, the desire for mobile devices and progressive "smart" digitization will further increase, and the application range of PCBs will become more and more extensive, and at the same time, it will bring new momentum to the PCB industry. The downstream of the PCB industry covers almost all electrical circuit products, and the core application areas include communication equipment, computers, consumer electronics and automotive electronics. At present, the communications field is the largest downstream of PCB, and the communications market accounts for about one-fifth of the global output of electronic products, which includes mobile and fixed devices and their infrastructure. In particular, mobile devices have driven the demand for rigid, flexible and flexible substrates. PCBs are mainly used in the communication field in transmission networks, wireless networks, data communications, and fixed broadband equipment. The 5G base station is characterized by high frequency and high speed, which requires the use of millimeter waves with higher frequencies and wider bandwidths. Band (frequency from 30GHz to 300GHz). Because millimeter waves belong to the extremely high frequency range, the transmission characteristics of electromagnetic waves are that the higher the frequency, the shorter the wavelength, the weaker the diffraction ability, and the stronger the penetration ability. However, the signal penetration process will lose a lot of energy, which leads to the shorter the transmission distance. To solve the problem of serious signal attenuation, the only way to increase the number of 5G base stations is to increase the number of 5G base stations and 5G electronic equipment. The increase in 5G base stations and 5G electronic equipment has led to a sharp increase in PCB demand, which will bring broad market space to PCB and strongly promote the rapid development of the PCB industry. 5G h...

PCBA is the abbreviation of Printed Circuit Board Assembly, that is to say, PCB empty board, after SMT loading, or the entire manufacturing process of DIP plug-in, referred to as PCBA. SMT (Surface Mount Technology): The main use of the placement machine is to mount some micro-small parts on the PCB. The production process is: PCB board positioning, printing solder paste, placement machine placement, reflow oven and finished inspection. SMT is very sensitive to positioning and the size of parts during integration. In addition, the quality of solder paste and printing quality also play a key role. DIP stands for "plug-in": Inserting parts on the PCB board, due to the large size of the parts and not suitable for mounting SMT or the manufacturer's production process cannot use SMT technology to integrate parts in the form of plug-ins. At present, there are two implementation methods of manual plug-in and robot plug-in in the industry. The main production process is: sticking adhesive (to prevent solder paste from plating where it shouldn’t be), plug-in, inspection, wave soldering, brushing (removed in the past) Stains left in the process of the furnace) and made inspection.