Pcb printed circuit board to prevent scratches. Who has the number? Provide it, just two sentences.

Scratch is one of the most difficult defects on the circuit board, which involves the most processes.

The reason why PCB can be used more and more widely is that it has many unique advantages, as follows:

High density Over the years, with the improvement of integrated circuit integration and the progress of mounting technology, the high density of printed boards has developed.

High reliability Through a series of technical means such as inspection, testing and aging test, the PCB can work reliably for a long time (the service life is generally 20 years).

Designability requirements of various performances of PCB (electrical, physical, chemical, mechanical, etc.). ) can be achieved through design standardization and normalization. This design has short time and high efficiency.

Extended data:

PCB has the following functions in electronic equipment:

(1) Provide mechanical support for fixing and assembling various electronic components such as integrated circuits, realize wiring and electrical connection or electrical insulation between various electronic components such as integrated circuits, and provide required electrical characteristics.

(2) Provide solder resist graphics for automatic welding, and provide identification characters and graphics for component insertion, inspection and maintenance. ?

(3) After electronic equipment adopts printed boards, due to the consistency of similar printed boards, manual wiring errors are avoided, and electronic components can be automatically inserted or installed, welded and inspected, thus ensuring the quality of electronic products, improving labor productivity, reducing costs and facilitating maintenance. ?

Baidu encyclopedia -PCB (printed circuit board)