At the beginning of electronic products, relatively few devices were used, the devices were relatively large, and the quantity produced was relatively small. In the electronic products produced during this period, the various devices were directly connected by wires.
Later, there were more and more devices in electronic products, the devices became smaller and smaller, and the number of products produced increased. Only by manually cutting the wires, the welding efficiency is particularly low, and it is easy to make mistakes, and it is not easy to repair after making mistakes. So in order to meet the needs of the process, printed circuit boards were born. The birth of circuit boards has greatly improved production efficiency, and production lines can be used for production.
At first, the circuit board was single-layer, that is, the entire circuit board had only one layer of copper skin. Nowadays, many electronic products with simple functions also use single-layer boards, such as power supply circuit boards, TV air conditioner remote control circuit boards, etc. Later, as the functions of electronic products became more and more complex and the devices became more and more complex, the single-layer circuit board became a double-layer circuit board. A double-layer circuit board means that the front and back sides of the circuit board have copper skins, and the middle is connected by vias or pads. Nowadays, many industrial control circuit boards and instrumentation circuit boards use double-layer circuit boards.
Later, the double-layer circuit board was not enough, so there was a 4-layer circuit board, and two layers of copper were sandwiched between the circuit boards. Now many Bluetooth headsets or smart devices mostly use four-layer boards. Later, there were 6-layer boards, 8-layer boards, and even dozens of layer boards. These circuit boards are generally used in computer motherboards, memory sticks, and mobile phone motherboards.
Function of PCB circuit board:
1. Provide mechanical support for the fixed assembly of various electronic devices such as integrated circuits, realize the wiring between electronic components, and provide the required electrical characteristics
2. Provide welding graphics for automatic welding, and provide identification characters and graphics for electronic component insertion and inspection
3. It can realize automatic insertion or placement of electronic components, automatic welding and other functions
4. Provide the required electrical characteristics, electromagnetic compatibility characteristics and characteristic impedance for high-speed and high-frequency circuits
5. Provide electrical functions for printed boards of passive components
6. Provide effective chip carriers for large-scale and ultra-large-scale electronic packaging devices
2. According to soft and hard classification: divided into rigid circuit board, flexible circuit board and soft and hard combination board
Later, there were more and more devices in electronic products, the devices became smaller and smaller, and the number of products produced increased. Only by manually cutting the wires, the welding efficiency is particularly low, and it is easy to make mistakes, and it is not easy to repair after making mistakes. So in order to meet the needs of the process, printed circuit boards were born. The birth of circuit boards has greatly improved production efficiency, and production lines can be used for production.
At first, the circuit board was single-layer, that is, the entire circuit board had only one layer of copper skin. Nowadays, many electronic products with simple functions also use single-layer boards, such as power supply circuit boards, TV air conditioner remote control circuit boards, etc. Later, as the functions of electronic products became more and more complex and the devices became more and more complex, the single-layer circuit board became a double-layer circuit board. A double-layer circuit board means that the front and back sides of the circuit board have copper skins, and the middle is connected by vias or pads. Nowadays, many industrial control circuit boards and instrumentation circuit boards use double-layer circuit boards.
Later, the double-layer circuit board was not enough, so there was a 4-layer circuit board, and two layers of copper were sandwiched between the circuit boards. Now many Bluetooth headsets or smart devices mostly use four-layer boards. Later, there were 6-layer boards, 8-layer boards, and even dozens of layer boards. These circuit boards are generally used in computer motherboards, memory sticks, and mobile phone motherboards.
Function of PCB circuit board:
1. Provide mechanical support for the fixed assembly of various electronic devices such as integrated circuits, realize the wiring between electronic components, and provide the required electrical characteristics
2. Provide welding graphics for automatic welding, and provide identification characters and graphics for electronic component insertion and inspection
3. It can realize automatic insertion or placement of electronic components, automatic welding and other functions
4. Provide the required electrical characteristics, electromagnetic compatibility characteristics and characteristic impedance for high-speed and high-frequency circuits
5. Provide electrical functions for printed boards of passive components
6. Provide effective chip carriers for large-scale and ultra-large-scale electronic packaging devices
Classification of PCB circuit boards:
1. Classified according to the number of layers: divided into single-panel, double-panel and multi-layer boards2. According to soft and hard classification: divided into rigid circuit board, flexible circuit board and soft and hard combination board
