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What Are Blind Vias and How Are They Utilized in Flexible Circuit Board Manufacturers?

How Are They Utilized in Flexible Circuit Board Manufacturers

The use of Blind and Buried vias in PCBs is becoming increasingly popular due to their ability to allow for higher-density interconnections without increasing the overall layer count or the size of the board. They can also make it possible to place critical components in the center of the board, which is especially important for small electronic devices such as tablets, laptops and cellphones. However, it’s important to understand that using these vias can add significantly to the overall cost of a PCB. This is because they require extra work, testing and flexible circuit board manufacturers steps in order to be properly formed and placed on the board.

In the case of blind vias, a hole is drilled through the top or bottom surface of the board and then filled with a conductive material using either electroless or electroplating. This hole is a crucial part of the PCB stackup because it allows for connections between the inner layers and the outer layers of the board. However, it’s important to note that the drill depth must be carefully controlled. If it is too deep then it could cause signal distortion or degradation, while if it is too shallow then it may not provide a reliable connection.

There are two ways in which blind and buried vias can be added to the PCB, and both methods will increase the overall cost of the board. The first way is to drill them after multilayer lamination. This method is generally preferred as it does not require the use of special chemicals to etch the copper and can be more accurately controlled. However, there is the risk of air bubbles being introduced to the circuit board during the drilling process. This can lead to the formation of a solder ball, which is not desirable for high-quality electronics.

What Are Blind Vias and How Are They Utilized in Flexible Circuit Board Manufacturers?

Another way to create blind and buried vias is to do so before the multilayer lamination process. This involves drilling a hole through the inner layer and then adding a copper pad. This will create a conductive connection between the inner layers and the outer layer, but it is not as accurate as the other method of creating these vias. This is because the PCB will be able to move around during the forming process and could change the position of the hole.

It is also possible to form blind and buried vias through the sequential lamination method. This is the most expensive method because it requires a significant number of manufacturing steps in order to ensure that the holes are formed correctly. It also increases the likelihood of yield loss because of the difficulties involved in handling very thin laminates during the drilling, etching and plating processes.

The best way to avoid any issues with the blind and buried vias on a PCB is to carefully plan out the design of the board, including the placement and drilling of these vias. It’s also important to ensure that the proper controls are in place during manufacturing in order to guarantee the integrity of these vital components. This includes establishing strict quality control procedures, regular inspections and ensuring that the drill equipment is always properly calibrated.


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