source:Industry News release time:2022-04-08 Article author:sznbone Popular:pcb
The first-order HDI PCB circuit board is relatively simple, and the process and process are easy to control.
The second-order HDI PCB circuit board starts to be troublesome, one is the alignment problem, the other is the problem of punching and copper plating. There are many kinds of second-order designs. One is that the positions of each order are staggered. When the second adjacent layer needs to be connected, it is connected in the middle layer through wires, which is equivalent to two first-order HDIs. The second is that the two first-order holes overlap, and the second-order is realized by superimposing, and the processing is similar to the two first-order holes, but there are many process points that need to be specially controlled, which is mentioned above. The third is to punch holes directly from the outer layer to the third layer (or N-2 layer).
For the third-order, the second-order analogy is the same.
For example:
The first-order and second-order of the 6-layer circuit board are for the PCB board that needs laser drilling, that is, the HDI board.
The first-order HDI board of 6-layer circuit board refers to blind holes: 1-2, 2-5, 5-6. That is, 1-2, 5-6 need laser drilling.
The second-order HDI board of 6-layer circuit board refers to blind holes: 1-2, 2-3, 3-4, 4-5, 5-6. That is, 2 laser drilling is required. 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, and then drill 1-2, 5-6 laser holes for the second time. Finally Drill through holes. It can be seen that the second-order HDI board has been pressed twice and laser drilled twice.
In addition, the second-order HDI board is also divided into: second-order HDI board with staggered holes and second-order HDI board with stacked holes. Board refers to blind holes 1-2 and 2-3 stacked together, for example: blind: 1-3, 3-4, 4-6.
Black oil HDI circuit board
And so on, the third-order, the fourth-order... are all the same.
The number of steps refers to the number of times of pressing.
The first-order PCB board is formed by pressing once, which can be imagined as the most common PCB circuit board.
The second-order PCB board is pressed twice. Taking the eight-layer circuit board with blind and buried holes as an example, first make the circuit board of 2-7 layers and press it well. At this time, the through-hole and buried holes of 2-7 have been completed. Add 1 layer and 8 layers, and punch 1-8 through holes to make the whole board.
The third-order PCB board is more complicated than the above, first press 3-6 layers, then add 2 and 7 layers, and finally add 1 to 8 layers, a total of three times to be pressed, which is generally impossible for circuit board manufacturers.
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