Through hole filling fusion HDI processing technology

Abstract

The invention discloses a through hole filling fusion HDI processing process, and relates to the technical field of computer hardware equipment. According to the process, a hole is drilled in a PCB, and a copper base used for heat dissipation is embedded into the PCB in an electroplating hole filling mode. The embedded copper fusion HDI technology is adopted, the surface of the position, where thecomponent needs to be mounted, of the PCB is smooth, and the problems that in the embedded technology, the height difference exists between the surface of the copper block and the surface of the PCB,the concave problem exists in the joint position of the copper block and the PCB, and when the electronic component is mounted, poor placement of the component is likely to happen are solved. Besides, the process adopts an embedded copper fusion HDI technology, the processing flow is simple, the problems of delamination, cracks and the like caused by the fact that recesses exist at the connectionpositions of the copper blocks and the PCB after metal base lamination and no base material copper exists at the connection positions of the copper blocks and the PCB in an embedded metal base technology are avoided, and HDI products with two or more orders can be processed.

Description

technical field [0001] The invention relates to the technical field of computer hardware equipment, in particular to a through hole filling fusion HDI processing technology produced by applying PCB boards. Background technique [0002] In order to facilitate the understanding of the technical background of this patent, the structure of the PCB board is briefly described first. The PCB board is a multi-layer board composed of multiple layers of copper foil layers, and an insulating layer is provided between adjacent copper foil layers. When in use, the integration of circuits is realized by conducting different layers of copper foil layers. According to the manufacturing method of PCB, it can be divided into Foil stacking method and Book stacking method. [0003] like Figure 7 As shown, the Book stacking method is to press the multi-layer inner core boards (core) together through insulating PP, and insulating PP is arranged between adjacent inner layer core boards. Here, th...

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Problems solved by technology

Due to the existence of processing errors, the distance between the lower side of the uppermost inner core board core and the upper side of the lowermost inner core board core will be inconsistent with the height of the copper block, so the copper block and PCB handover position will exist. The problem of unevenness, when mounting electronic components, it is easy to cause problems such as poor placement of components

[0008] 2. When inserting metal copper blocks, slots need to be opened, and the slots need to be slightly larger than the copper blocks. Since the insulating PP has a certain fluidity after being heated, the gaps will be filled with insulating PP when pressing. Because the insulating PP Glue flow is difficult to control, so there will be a series of problems such as delamination, voids, cracks, etc.

[0009] 3. The embedded metal base can only be used for PCB boards manufactured by Book stacking method

[0010] 4. Since the embedded metal base can only be used for PCB boards manufactured by Book stacking method, and the outer layer and sub-outer layer of PCB boards manufactured by Book stacking method can only use the inner core board core, so the second-order and HDI products of the above order

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