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Buried Blind hole Board is not necessarily HDI PCB, HDI PCB has a blind hole, buried hole is not necessarily, depending on your product is a few stages of several pressure products. Explain the following: 6 layer PCB 1+N+1, 2+N+2 is for the demand of laser drilling wrench, that is the HDI PCB. Finger blind hole of 1+N+1 HDI  on 6 layers: 1-2, 2-5, 5-6, namely 1-2, 5-6 requires laser drilling. Finger blind hole of 6-layer second-order HDI : 1-2, 2-3, 3-4, 4-5, 5-6. Laser drilling is required for 2 times.First, the buried hole of 3-4 was drilled, and the laser hole of 2-3, 4-5 was pressed, and the second laser hole of 1-3, 4-5 was pressed, and the second laser hole of 1-2, 5-6 was drilled, and finally the hole was drilled through. Thus it can be seen that the 2+N+2 HDI was pressed twice, and the laser hole was drilled twice. HDI – HIGH DENSITY INTERCONNECT PCB HDI boards, one of the fastest growing technologies in PCBs, are now available at Reada. HDI Boards contain blin...

Custom blind and buried vias fabrication  from professional and experienced pcb board supplier at low cost. B lind and B uried V ia First of all, we start with traditional multi-layer boards. The structure of a standard multi-layer circuit board is a process including an inner layer line and an outer layer line, followed by drilling, and metallization in the hole to achieve the internal connection function of each layer line. However, due to the increase in line density, the way parts are packaged is constantly updated. In order to allow for a wider board area, more high-performance parts can be placed. In addition to the thinner line width, the aperture is also reduced from 1 mm in the DIP jack to 0.6 mm in SMD, and further reduced to 0.4 mm or less. However, the surface area is still occupied, so that there are buried holes and blind holes. The Buried Holes and Blind Holes are Defined as Follows Blind Vias: A blind via is a type of via that connects the inner trace of th...