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Difference betwen HDI PCB and Buried Blind Hole PCB
2019-07-17 17:15:02
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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.

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