source:Industry News release time:2021-09-13 Article author:sznbone Popular:pcb
The difference between hdi circuit board and buried blind hole PCB board
PCBs with buried blind holes are not necessarily HDI circuit boards. HDI boards generally have blind holes, but buried holes are not necessarily the case. It depends on the order and pressure of your product.
described as follows:
The first order and the second order of the 6-layer PCB board are for the board that needs laser drilling, that is, the HDI circuit board.
6-layer first-order HDI board refers to blind holes: 1-2, 2-5, 5-6, that is, 1-2, 5-6 need laser drilling.
6-layer second-order HDI board refers to blind holes: 1-2, 2-3, 3-4, 4-5, 5-6. It requires 2 laser drilling. First drill 3-4 buried holes, then press 2-5, then drill 2-3, 4-5 laser holes for the first time, then press 1-6 for the second time, then drill 1-2 for the second time , 5-6 laser holes, and finally drilled through holes. It can be seen that the second-order HDI board has been pressed twice and laser drilled twice.
12-layer blind buried via circuit board
In addition, second-order HDI boards are also divided into: second-order HDI boards with wrong holes and second-order HDI boards with stacked holes. The board refers to the blind holes 1-2 and 2-3 stacked together, for example: blind: 1-3, 3-4, 4-6.
and so on, third-order, fourth-order... are all the same.
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