Why do blind holes and buried holes appear?-深圳市海博精密电路有限公司

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Blind and buried holes

Why do blind holes and buried holes appear?

Why do blind holes and buried holes occur in PCB manufacturing? This issue should start with traditional multi-layer printed circuit boards. The structure of a standard multilayer circuit board consists of an outer layer and an inner layer. In order to achieve internal connection between each circuit layer, it is necessary to use through holes and metalize them. But you know that the size of printed circuit boards is limited, so if you want to achieve more functionality in PCB assembly and place more high-performance components on the circuit board, you must add more circuit lines to the circuit board.

In addition to the reduction in line width, the size of DIP plug-in holes has also been reduced from 1mm to 0.6mm for SMD, and further reduced to below 0.4mm, but it still occupies the surface area of the PCB. Therefore, blind buried holes have emerged in some high-tech PCB manufacturers.

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