PCB Technical - Circuit board proofing and the selection factors of circuit board manufacturers

With the rapid development of mobile phones, electronics, and communication industries, it has also promoted the continuous growth and rapid growth of the circuit board proofing industry. People have more and more requirements for the number of layers, weight, precision, materials, colors, and reliability of components. Come higher.

However, due to fierce market price competition, the cost of circuit board proofing materials is also on a rising trend, and more and more manufacturers are monopolizing the market with low prices in order to enhance their core competitiveness. However, behind these ultra-low prices are obtained by reducing material costs and process manufacturing costs, but devices are usually prone to cracks (cracks), scratches, (or scratches), and their precision, performance and other comprehensive factors have not reached the standard., Which seriously affects the solderability and reliability of the product.

In the face of the various circuit board proofing on the market, there are two ways to distinguish the quality of the circuit board proofing; the first method is to judge from the appearance, and the other is to judge from the quality specification requirements of the PCB board itself.

How to judge the quality of circuit board proofing:

First: distinguish the quality of the circuit board from the appearance

Under normal circumstances, the appearance of the PCB circuit board can be analyzed and judged through three aspects;

1. Standard rules for size and thickness.

The thickness of the circuit board is different from that of the standard circuit board. Customers can measure and check the thickness and specifications of their own products.

2, light and color.

The external circuit boards are covered with ink, and the circuit board can play an insulating role. If the color of the board is not bright and the ink is less, the insulation board itself is not good.

3. The appearance of the weld.

The circuit board has many parts. If the soldering is not good, the parts are easy to fall off the circuit board, which will seriously affect the soldering quality of the circuit board. The appearance is good. It is very important to identify carefully and have a stronger interface.

Second: High-quality circuit board proofing needs to meet the following requirements

1. The phone is required to be easy to use after the components are installed, that is, the electrical connection must meet the requirements;

2. The line width, line thickness, and line distance of the line meet the requirements to prevent the line from heating, breaking, and short-circuiting;

3, the copper skin is not easy to fall off under high temperature;

4, the copper surface is not easy to oxidize, which affects the installation speed, and it will be broken soon after oxidation;

5. No additional electromagnetic radiation;

6. The shape is not deformed, so as to avoid deformation of the shell and dislocation of the screw holes after installation. Now they are all mechanized installations, the hole position of the circuit board and the deformation error of the circuit and the design should be within the allowable range;

7, and high temperature, high humidity and special environment resistance should also be considered;

8. The mechanical properties of the surface must meet the installation requirements;

The above is the way to judge whether the circuit board is good or bad. When buying a PCB circuit board, be sure to keep your eyes open.