The Role of Rigid PCBs in Modern Electronics

Rigid PCB (printed circuit board) is a key component in modern electronic equipment, the main advantage is its structural stability. Compared to flexible printed circuit boards, rigid PCBS are more physically stable, less prone to bending or twisting, and can accommodate more components and connections. Due to their rigid structure, rigid PCBS can support larger components and more complex circuit designs. This makes them useful in high-performance applications where large amounts of data and signals need to be processed, such as computers and communication equipment.

In the manufacturing process of Rigid PCB, surface treatment is a key step. Organic Solderability Preservative (OSP) is a common surface treatment technique. OSP surface treatment involves coating the PCB surface with a thin layer of organotin protective film. This treatment method provides good welding performance, but also provides a certain amount of environmental protection. The advantages of OSP surface treatment include good weldability, lower cost and environmental protection. Due to the presence of organotin protective film, OSP-treated PCBS can provide stable welding performance, so that components can be reliably welded to the PCB. In addition, the cost of OSP treatment is relatively low, which can reduce the total cost of PCBS. The materials used in the OSP treatment are environmentally friendly and meet the green manufacturing requirements of modern electronic devices.

Some of the main steps of the rigid PCB manufacturing process:

Design: Use computer aided design (CAD) software to design circuit diagrams. The function, size, layout and other factors of the circuit to create an effective and workable design.

Plate making: After the design is complete, the design needs to be converted into the actual circuit board. Through lithography technology, ultraviolet light is irradiated on a copper plate covered with a photosensitive material, and then the part that is not irradiated by ultraviolet light is etched through an acidic solution to form a circuit pattern.

Drilling: Drilling holes in the circuit board to install electronic components. This is done using a CNC drilling machine, which allows drilling to be done precisely at the specified location.

Coating: After drilling, a thin layer of copper needs to be plated on the wall of the hole to ensure the conductivity in the hole, which is achieved by electrochemical deposition.

Patch: Mount electronic components to a circuit board. This is done with an automatic mounter, which can quickly and accurately attach components to the specified position.

Welding: The components are welded together with the circuit board to ensure electrical connections. Use wave soldering or reflow welding method to achieve.

Each step requires precise control and rigorous quality checks to ensure the performance and reliability of the final product.

Electroless Nickel/Immersion Gold (ENIG) is a common surface treatment technique used in the manufacture of Rigid PCB. ENIG surface treatment involves electroplating a layer of nickel on the PCB surface and then plating a thin layer of gold. The nickel layer is mainly used to protect the PCB surface and prevent oxidation, while the gold layer provides good conductivity and weldability. The advantages of ENIG surface treatment include good weldability, long-term storage stability, and environmental resistance. Due to the presence of the gold layer, the ENIG treated PCB can provide stable welding performance, so that the components can be reliably welded to the PCB. The gold layer can also prevent the oxidation of the PCB during storage and improve the storage stability of the PCB. Finally, since both gold and nickel have good corrosion resistance, ENIG treated PCBS can maintain their performance under various environmental conditions.