Printed circuit board structure is also very complicated, including single layer, double layer and even multiple layers.They can be divided into single-layer boards, double-layer boards, multilayer boards and double-sided boards.
PCB board can be divided into rigid pcb, flexible pcb (FPC) and rigid-flex pcb according to the hardness.
In terms of function, the holes can be divided into two categories, one is used for electrical connection between each layers; The other is used to fix or position the components.
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The circular PCB board can adopt the standardized design, which is conducive to mechanization and automation in the production process. At the same time, the entire printed circuit board after assembly and debugging can be used as an independent spare part, which is convenient for the interchange and maintenance of the whole product.
For many years, the high density of printed boards has been able to develop correspondingly with the increase in integrated circuit integration and advances in mounting technology.
Through a series of inspection, testing and aging tests, it can ensure that the PCB works reliably for a long time (usually 20 years).
The requirements for various performances (electrical, physical, chemical, mechanical, etc.) of the PCB can be achieved through design standardization and standardization. The design time is short and the efficiency is high.
PCB adopts modern management, which can realize standardization, scale (quantity), and automated production, thereby ensuring the consistency of product quality.
Established relatively complete test methods and test standards, which can be used to test and identify the qualification and service life of PCB products through various test equipment and instruments.
PCB products are not only convenient for standardized assembly of various components, but also for automated, large-scale mass production. In addition, the PCB and other various components are integrated to form larger components and systems, up to the entire machine.
Since various components of PCB product are assembled as a whole with standardized design and large-scale production, these components are also standardized. Therefore, once the system fails, it can be replaced quickly, easily and flexibly, and the system work can be quickly restored.
