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PCB multi-layer blind buried hole board manufacturing factory

2019-08-22 16:38:14 450

Multi-layer blind buried hole technology is to add some special forms of drilling holes in the design and manufacture of multi-layer boards. These holes are not through holes from the top layer to the bottom layer. They only penetrate several layers of the board (ie only Electrical connection to certain layers of lines). The emergence of blind buried via technology has made PCB design more diverse and designers have more space to distribute lines. A hole that has no end connected to the top or bottom layer is usually called a buried hole, and a hole with one end connected to the top or bottom layer is called a blind hole.

If the 12-layer blind buried hole circuit board is to be copied, the difficulty is relatively high. When the industrial control PCB board is generally blindly buried and the HDI board is copied, the blind buried hole will be encountered.


The following experience is obtained according to the blind hole plate.


1. Be careful and prepare for the board.


2. Equipment must be advanced.


3. In the process of copying the board, it should be constantly compared with the original board.


4. Pay attention to the inspection and repeat the inspection several times.

Blind buried hole circuit boards, also known as HDI boards, are often used in high-end products such as communication equipment, GPS navigation, etc. It is a process that includes inner and outer lines, reuse of holes, and metallization in the holes. In order to achieve the connection function between the internal layers of each layer.

With the development of high-density and high-precision electronic products, the same requirements are imposed on circuit boards. The most effective way to increase the density of pcb is to reduce the number of through holes, and gold does set blind holes, buried holes to achieve this requirement, resulting in the production of HDI boards.

The so-called blind hole refers to a hole that does not penetrate the circuit board. As in a 4-layer board,

A hole between the first layer and the second layer, between the second layer and the third layer, and the like.

A board with a blind hole is called a blind hole plate.


With the current development of portable products in the direction of miniaturization and high density, the eight-layer circuit board blind buried hole puts forward higher requirements on the PCB production process.

In most of the current portable products, the BGA package with 0.65mm pitch or less, and the eight-layer blind buried hole control PCB board use the eight-layer circuit board blind buried hole blind buried hole process, then what is the blind buried hole?

Blind hole: A blind hole is a type of via that connects the inner layer of the PCB to the surface trace of the PCB. This hole does not penetrate the entire board.

Buried hole: The buried hole is only connected to the type of via of the trace between the inner layers, so it is not visible from the surface of the PCB.

The buried plate is consistent with the conventional double-panel approach.


A blind hole plate, that is, one side is the outer layer:

Positive film process: need to do single-sided d/f, pay attention to the wrong surface (when the double-sided copper is inconsistent); when d/f exposure, the light copper surface is covered with black tape to prevent light transmission.

Because the blind hole plate is made more than twice, the electric power is very thick and thick. Therefore, the electric control wire is thick and thick, and the thickness of the copper thick plate is indicated after etching.

After pressing the plate, use the x-ray machine to shoot the target hole for the multi-layer board.

Negative film process: for thin plates (<12mil with copper) because it can not be produced in the drawing of electric pull, it must be produced in water gold, and water gold pull can not be divided into surface current, so it is impossible to do single-sided non-current or hit according to mi requirements. A small current, such as the positive film process, often results in a single-sided copper thick and thick, resulting in etching difficulties, young lines, so such boards need to take the negative process.


The following describes what is a blind buried plate


Blind buried hole circuit boards, also known as HDI boards, are often used in high-end products such as communication equipment, GPS navigation, etc. The structure of conventional multilayer circuit boards is composed of inner and outer lines, and then drilled. The holes, as well as the metallization process in the holes, enable the bonding function between the interiors of the various layers.

With the development of high-density and high-precision electronic products, the same requirements are imposed on circuit boards. The most effective way to increase the PCB density by industrially controlling the PCB board is to reduce the number of through holes, and to make blind holes and buried holes to achieve this requirement, thereby generating an HDI board.


Shenzhen Juding Circuit Technology Co., Ltd. specializes in: PCB circuit board manufacturing, PCB board proofing, HDI board, TG board, mixed pressure board, thick copper foil board, impedance board, Rogers board, soft and hard board, metal substrate, etc. A special material or process PCB board 1-34 laminate production and production. Welcome to consult customers for more details!