The names of PCB circuit boards are: ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board; circuit board, PCB board, aluminum substrate, high frequency board, thick copper impedance board, PCB, ultra-thin circuit board, ultra-thin circuit board, printed (copper etching technology) circuit board, etc. The miniaturization and visualization of the circuit by the circuit board plays an important role in the mass production of fixed circuits and the optimization of the layout of electrical appliances.
The circuit board can be called a printed circuit board or a printed circuit board. A flexible printed circuit board made of high reliability and excellent material. It has the characteristics of high wiring density, light weight, thin thickness and good bendability (and soft and hard combination board (reechas, SoftandhardcombinaTlonplate)- The birth and development of FPC and PCB have given birth to the new product of soft and hard board. Therefore, the soft and hard board is a combination of flexible circuit board and rigid circuit board according to the relevant process requirements. A circuit board with FPC characteristics and PCB characteristics.
According to the number of layers, the circuit board is divided into three major categories: single-sided PCB board, double-sided PCB board and multi-layer circuit board. It is a single-sided circuit board at first, and on the most basic PCB, parts are concentrated on one side, and wires are concentrated on the other side. Because wires only appear on one side, this PCB is called a single-sided circuit board. Single-sided panels are usually simple to make and low in cost. But the disadvantage is that they cannot be applied to too complicated products.
The double-sided PCB board is an extension of the single-sided board. When the single-layer wiring cannot meet the needs of electronic products, double-sided boards must be used. There are copper clad and traces on both sides, and the lines between the two layers can be conducted through via holes to form the required network connection.
A multilayer circuit board refers to a printed board that has more than three layers of conductive pattern layers and insulating materials in between and are laminated at intervals, and the conductive patterns are interconnected as required. Multilayer circuit board is the product of the development of electronic information technology in the direction of high speed, multi-function, large capacity, small volume, thinner and lighter weight.
Circuit boards are divided into soft boards (FPC), hard boards (PCB), and soft-hard boards (FPCB) according to their characteristics.
Usually, a complete machine is composed of several printed circuit boards, and the printed circuit boards can be large or small. The circuits contained on each printed PCB board are often drawn on a circuit diagram. Therefore, a whole machine circuit diagram is often composed of several board circuit diagrams. After understanding each board circuit diagram, you can understand the whole machine circuit diagram. Each board circuit diagram includes one or several circuit systems. The complexity of large board circuit diagrams is almost It is similar to the circuit diagram of ordinary small and medium-sized screen TVs. Although the circuits are relatively complex, and various circuit boards perform different functions, they have rules to follow and can be read in steps according to certain methods.
In order to avoid detours when reading circuit diagrams, correct methods and steps for reading diagrams should be used. Usually adopt the method of outflanking the outside and from the outside to the inside. Adopting the methods of internal and external integration, front and rear connection, and step-by-step breakthrough can read all circuit diagrams more smoothly. The specific method and steps of looking at the picture can be summed up in three sentences and three steps: start from the periphery and choose the entrance; open the gap and connect the front and back; analyze the difficulty and put it at the end.
