PCB circuit board (Printed Circuit Board) is an important part of electronic products. It is the basis of electronic components and circuit connections, so as to realize the function of electronic equipment. It is the most important part of electronic product manufacturing. This article will introduce the materials, structure and manufacturing technology of PCB circuit boards.
1. The material of PCB circuit board
1. Substrate
The base material of the PCB circuit board is generally composed of epoxy resin and glass fiber. This structure provides good mechanical and electrical properties. Fiberglass provides good mechanical strength, epoxy resin provides good electrical insulation, and epoxy resin can connect the glass fibers and components together to form a complete circuit.
2. Copper clad
Copper cladding can provide the electrical conductivity of the circuit board, so that the circuit on the circuit board can work normally. The thickness of copper clad is generally divided into single-sided board, double-sided board and multi-layer board. The thickness of single-sided board is generally 18-35um, that of double-sided board is generally It is 18-105um.
3. Solder resist copper
Solder resist copper is an important element on the PCB circuit board. It can connect the components with the copper clad sheet on the PCB circuit board, so that the circuit on the circuit board can work normally. The thickness of the solder resist copper is generally 1-3um, if the thickness is too thick, it will affect the welding quality, and if the thickness is too thin, the PCB circuit board will be damaged.
Second, the structure of the PCB circuit board
1. Single panel
The single-sided board is a PCB circuit board composed of a layer of copper clad and a layer of solder mask copper. It has only one back, and the circuit can only be realized on one side. The layout of the circuit is relatively simple, and it is suitable for simple circuits.
2. Double panel
The double-sided board is a PCB circuit board composed of two layers of copper clad and two layers of solder resist copper. It has two sides, and the circuit can be realized on both sides. The layout of the circuit is relatively complicated, and the space utilization rate is high, which is suitable for complex circuits.
3. Multi-layer board
The multi-layer board is a PCB circuit board composed of multi-layer copper clad and multi-layer solder resist copper. It has multiple sides, and the circuit can be realized on multiple sides. The layout of the circuit is more complicated, and the space utilization rate is higher. It is suitable for more complex circuits.
Three, PCB circuit board production technology
1. Draw
The drawing of the PCB circuit board is a link with high technical requirements. It uses software to draw the graphics of the PCB circuit board, and then uses professional instruments to convert the graphics into components on the circuit board.
2. Engraved
Engraving is to engrave components such as graphics on the circuit board onto the circuit board. Through engraving, a good component connection can be formed on the circuit board, so that the circuit on the circuit board can work normally.
3. Welding
Soldering is to connect the components on the circuit board. It is an important part of the components on the circuit board. Only a circuit board with good welding quality can correctly realize the function of the circuit.
In short, the material, structure and manufacturing technology of PCB circuit boards are the most important components in the manufacture of electronic products. They can provide good mechanical and electrical properties for electronic products and ensure the normal operation of electronic products.
1. The material of PCB circuit board
1. Substrate
The base material of the PCB circuit board is generally composed of epoxy resin and glass fiber. This structure provides good mechanical and electrical properties. Fiberglass provides good mechanical strength, epoxy resin provides good electrical insulation, and epoxy resin can connect the glass fibers and components together to form a complete circuit.
2. Copper clad
Copper cladding can provide the electrical conductivity of the circuit board, so that the circuit on the circuit board can work normally. The thickness of copper clad is generally divided into single-sided board, double-sided board and multi-layer board. The thickness of single-sided board is generally 18-35um, that of double-sided board is generally It is 18-105um.
3. Solder resist copper
Solder resist copper is an important element on the PCB circuit board. It can connect the components with the copper clad sheet on the PCB circuit board, so that the circuit on the circuit board can work normally. The thickness of the solder resist copper is generally 1-3um, if the thickness is too thick, it will affect the welding quality, and if the thickness is too thin, the PCB circuit board will be damaged.
Second, the structure of the PCB circuit board
1. Single panel
The single-sided board is a PCB circuit board composed of a layer of copper clad and a layer of solder mask copper. It has only one back, and the circuit can only be realized on one side. The layout of the circuit is relatively simple, and it is suitable for simple circuits.
2. Double panel
The double-sided board is a PCB circuit board composed of two layers of copper clad and two layers of solder resist copper. It has two sides, and the circuit can be realized on both sides. The layout of the circuit is relatively complicated, and the space utilization rate is high, which is suitable for complex circuits.
3. Multi-layer board
The multi-layer board is a PCB circuit board composed of multi-layer copper clad and multi-layer solder resist copper. It has multiple sides, and the circuit can be realized on multiple sides. The layout of the circuit is more complicated, and the space utilization rate is higher. It is suitable for more complex circuits.
Three, PCB circuit board production technology
1. Draw
The drawing of the PCB circuit board is a link with high technical requirements. It uses software to draw the graphics of the PCB circuit board, and then uses professional instruments to convert the graphics into components on the circuit board.
2. Engraved
Engraving is to engrave components such as graphics on the circuit board onto the circuit board. Through engraving, a good component connection can be formed on the circuit board, so that the circuit on the circuit board can work normally.
3. Welding
Soldering is to connect the components on the circuit board. It is an important part of the components on the circuit board. Only a circuit board with good welding quality can correctly realize the function of the circuit.
In short, the material, structure and manufacturing technology of PCB circuit boards are the most important components in the manufacture of electronic products. They can provide good mechanical and electrical properties for electronic products and ensure the normal operation of electronic products.
