The difference between HDI board and blind hole buried circuit board

HDI is a kind of circuit board products, called the highDensityInterconnection, high-density interconnect board at present, the advanced electronic products are generally HDI board products. Blind hole ( Blindvias） : inner blind hole is the PCB line connected to the PCB surface go line of hole type, this hole is not through the whole board. Embedded hole ( Buriedvias） : buried hole only connection between the inner line hole type, so from the PCB surface is look not to come out. With the design of portable products toward the direction of miniaturization and high density, PCB design difficulty is becoming more and more big, the production process of PCB put forward higher requirements. At present most of the portable products zero. BGA encapsulation, under 65 mm spacing should be used in the design of buried blind hole process, so what is a blind hole buried? Blind hole (HDI PCB circuit boards Blindvias） : inner blind hole is the PCB line connected to the circuit board surface of the hole type, this hole is not through the whole board. Embedded hole ( Buriedvias） : buried hole only connection between the inner line hole type, so from the PCB surface is look not to come out. Have buried blind hole is not necessarily HDI PCB circuit boards, but generally HDI board has blind hole, buried hole is not necessarily, to see your circuit board product is a product of a few order pressure. Instructions are as follows: 6 layers PCB in order, second order is the need for laser drilling of the board, namely the HDI board. 6 layers PCB first-order HDI board refers to the blind hole: 1 - 2, 2 - 5, 5 - 6. The 1 - 2, 5 - 6 laser drilling. 6 layers PCB second-order HDI board refers to the blind hole: 1 - 2, 2 - 3, 3 - 4, 4 - 5, 5 - 6. That is 2 times the laser punch. Drill 3 - in the first place 4 buried hole, then pressing 2 - 5, then drill 2 - for the first time 3, 4 - 5 laser hole, then time pressing 1-2 6, then drill 1 - for the second time 2, 5 - 6 laser hole. The last to drill hole. Thus the second order twice pressing after the HDI board, two laser drilling. Second-order HDI board also is divided into: wrong hole second-order HDI board and fold the second-order HDI board, wrong hole second-order HDI board is refers to the blind hole 1 - 2 and 2 - 3 is staggered, and fold the second-order HDI board is refers to the blind hole hole 1 - 2 and 2 - 3 fold together, for example: blind: 1 - 3, 3 - 4, 4 - 6. So on the third order and fourth order & # 8230; … Are the same.

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