How does HDI PCB first-order and second-order and third-order distinguish?
The difference between the first order, the second order and the third order is to look at the number of laser holes. PCB core board is pressed several times and laser holes are punched several times, which is a few steps. That's the only difference.
1. After pressing once, drilling = = = ", pressing copper foil again outside = = = ", laser drilling again, this is the first order, as shown in the following figure
2. After pressing once, drilling = = ", pressing copper foil again outside = = ", laser drilling again, drilling = = ", outer layer pressing again = copper foil =", laser drilling again. This is second order. The main thing is to see how many times you radiate, that is, how many orders.
The second order is divided into two types: stacked holes and bifurcation holes.
As shown in the following figure, there are eight layers of second-order stacked holes. The layers 3-6 are pressed together first, and the outer layers 2 and 7 are pressed together to make a laser hole. Laminate 1,8 again and make another laser hole. Is to make two laser holes. Because this kind of hole is superimposed, the process difficulty will be higher and the cost will be higher.
The following figure shows eight layers of second-order cross blind holes. This processing method is the same as the above eight layers of second-order stacked holes, and it also requires two laser holes. However, the laser holes are not stacked together, so the processing difficulty is much less.
The third order, the fourth order, and so on.
Expansion Data
HDI is an abbreviation of High Density Interconnection (High Density Interconnector ), which is a kind of (technology) for producing printed circuit boards and a circuit board with relatively high circuit distribution density using micro blind buried via technology. HDI is a compact product designed for small capacity users.
HDI Board
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