Reuse this data in mechanical drawings can eliminate duplicate work, and more importantly, it can also eliminate human errors.

We can use DXF, IDF or PROSTEP format to import all information into PCB Layout software to solve this problem. Doing so can not only save a lot of time, but also eliminate people who may appear. Next, we will learn about these formats one by one.

What are the benefits of even layer PCB, do you know?

The designer may design a strange number layer printed circuit board (PCB). If the wiring does not require extra layers, why use it? Does the reduction of the layer not make the circuit board thinner? If the circuit board is one less layer, isn't the cost lower? However, in some cases, adding a layer will reduce the cost.

The structure of the circuit board

The circuit board has two different structures: nuclear core structure and foil structure.

In the nuclear core structure, all the conductive layers in the circuit board are applied to the nuclear core material; in the foil structure, only the internal conductive layer of the circuit board is applied to the nuclear core material. All conductive layers are bonded together through a multi -layer pressure process through the medium.

The nuclear material is the double -sided foil in the factory. Because each nucleus has two faces, when using multiple aspects, the number of conductivity layers of PCB is even. Why not use foil and the rest of the nuclear structure? The main reason is: the cost of PCB and the bending degree of PCB.

The cost advantage of the even layer circuit board

Because one less layer of medium and foil, the cost of the raw material of the odd PCB board is slightly lower than that of the even -layer PCB. However, the processing cost of the odd number layer PCB is significantly higher than that of the PCB. The processing cost of the inner layer is the same; but the applied foil/nuclear structure significantly increases the treatment cost of the outer layer.

The PCB of the odd layer needs to increase the non -standard layer of the layers of the cohesion of the nuclear structure. Compared with the nuclear structure, the production efficiency of factory production in the nuclear structure will decline. Before the layer pressure bonding, the outer nucleus requires additional process processing, which increases the risk of outer layers of scratches and etching errors.

Balanced structure Avoid bending

The better reason for designing PCB without the odd number layer is: the strange number layer circuit board is easy to bend. When the PCB is cooled after the multi -layer circuit bonding process, the different layer of pressure tension when the nuclear structure and the foil structure are cooled can cause PCB to bend. As the thickness of the circuit board increases, the greater the risk of composite PCB with two different structures. The key to eliminating circuit boards is to use balanced layers.

Although the bending PCB meets the standard requirements, the subsequent processing efficiency will be reduced, resulting in increased costs. Because special equipment and processes are required during assembly, the accuracy of components is reduced, so damage quality will be damaged.

Use the even layer of PCB

When a strange layer PCB appears in the design, the following methods can be used to achieve balanced layers, reduce PCB production costs, and avoid PCB bending. The following methods are arranged according to the preferred level.

One layer of signal layer and use. If the power layer of the PCB is an occlusal, the signal layer is a magical number. This method can be used. The increased layer does not increase costs, but it can shorten the delivery time and improve the quality of PCB.

Add an additional power layer. If the power layer of the PCB is a odd number and the signal layer is an occlusal number, this method can be used. A simple method is to add a ground layer in the middle of the layer without changing other settings. Plore a wiring in the PCB of the odd number layer, and then copy the strata in the middle to mark the remaining layers. This is the same as the electrical characteristics of the thickened layer.

Add a blank signal layer near the PCB layer center. This method is miniaturized unbalanced to improve the quality of PCB. Plore the wiring of the odd number layer first, and then add a layer of blank signal layer to mark the rest. It is used in the microwave circuit and the hybrid medium (the medium has different dielectric constants) circuits.