With the rapid development of mobile phone, electronics and communication industry, PCB circuit board industry has been growing and growing rapidly. People are increasingly demanding for components, weight, precision, materials, color and reliability.
However, due to the fierce competition in the market price, the cost of PCB board materials is also increasing. More and more manufacturers are trying to enhance their core competitiveness and monopolize the market at low prices. However, behind thes
The first is to distinguish the quality of the circuit board from the appearance. (under the same circumstances, the appearance of the PCB circuit board can be analyzed and judged through three aspects.
1. Standard rules for size and thickness.
The thickness of PCB is different from that of standard PCB. Customers can measure and check the thickness and specifications of their PCs.
2, light and color.
The external circuit boards are covered by ink, and the PCB can play an insulating role. If the color of the boards is not bright and ink is little, the insulation board itself is not good.
3. Weld appearance.
Because there are many parts in circuit board, if the welding is not good and the parts are easy to fall off, the welding quality of circuit board will be seriously affected. It is very important to have a good appearance, carefully identify and a strong interface.
Due to the large number of PCB, if the welding is not good, the parts which are easy to fall off will seriously affect the welding quality of the PCB. It is very important to have a good appearance, careful identification and strong interface.
1. When the components are installed, the telephone will be better used, that is, the electrical connection should meet the requirements.
2, line width, line thickness and line distance meet the requirements, so as to avoid heating, opening and short circuit.
3. The copper skin is not easy to fall off under high temperature;
4. The copper surface is not easy to oxidize, which affects the installation speed. It will be damaged soon after oxidization;
5. No additional electromagnetic radiation;
6, the shape is not deformed, so as to avoid the deformation of the shell after installation, and the screw holes are misplaced. Now they are all mechanized installation, the hole position of circuit board and the deformation error between circuit and design should be within the allowable range;
7, high temperature, high humidity and special environment should also be considered.
8, the mechanical properties of the surface should meet the installation requirements.