Blind holes and buried holes are two important technologies in circuit board manufacturing. They have some similarities in the manufacturing process, but there are also significant differences.
The following is a comparison of the manufacturing processes of these two technologies:
1. Overview of Manufacturing Process
Blind hole
Blind hole is a type of hole on a circuit board that does not have a through hole. It connects the outer and inner layers of the circuit board, but does not penetrate the entire circuit board. The manufacturing process of blind holes includes the following key steps:
Preprocessing: Imprint photosensitizer on PCB board and create the required graphic traces through exposure and development processes.
Cooling drilling: Cooling drilling is carried out at blind hole positions to ensure the accuracy and quality of the holes.
Scratching film: Remove burrs and impurities generated during the drilling process to improve the surface quality of the circuit board.
Coating: protects the circuit board from environmental factors such as moisture, dust, and chemicals.
Buried hole
Buried hole is a type of hole on the surface of a circuit board that has through holes but no through holes inside. It connects the inner layer of the circuit board but is not exposed to the outer layer. The manufacturing process of buried holes also includes similar steps:
Drilling: Create precise holes on the circuit board to facilitate smooth subsequent processes.
Scratching film: Remove burrs and impurities generated during the drilling process to improve the surface quality of the circuit board.
Coating: protects the circuit board from environmental factors such as moisture, dust, and chemicals.
2. Comparison of process characteristics

 

 

Blind holes and buried holes have their own advantages and application scenarios in circuit board manufacturing. Blind holes, due to their unique connection method, are suitable for applications that require high-density interconnection, but their manufacturing difficulty and cost are relatively high. And buried holes are widely used in various types of circuit boards due to their relatively simple manufacturing process and moderate cost. In practical applications, engineers need to choose the appropriate hole type based on specific circuit board design and functional requirements.