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1. The color and gloss of the board. The outside of the PCB factory's circuit boards are wrapped by various colors of ink. The ink can insulate and protect the circuit. If the gloss of the board is dim and the ink is thin, it is correct The circuit board itself is not good.
The board size and thickness accuracy, board size accuracy and board thickness tolerance accuracy determine the quality of production.
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For the circuit board with more welding parts, observe the clarity and micro-fineness of the surface packaging gap. A large number of welding operations will be carried out in these places, and the easier it is to distinguish, the better the production. The judgement of another aspect of PCB quality specification is:
1. After the components are installed, if the electrical performance is on or off, the surface circuit board is ok
2. The copper surface is not easy to be oxidized, which affects the speed of mounting. If the oxidation speed is too fast, problems will occur soon after use.
3. The ink will not fall off on the surface when welding encounters high temperature, and the copper skin will not fall off.
4. Whether the actual spacing and line width of the finished PCB circuit board are made according to the document, which affects the heating, open circuit, and open circuit conditions of the circuit.
5. Whether the warpage of the board is too large, it is often encountered in high-temperature environments during reproduction, and it will produce a certain degree of warpage due to stress and deformation, and severe deformation will seriously affect the placement and welding.
6. Whether the PCB circuit board can reach the standard under the high temperature and high pressure environment, and whether its raw materials can reach the tg value is also an important factor for judgment.
2, the automotive rigid-flex board is the key interconnection of automotive electronics
As the substrate and key interconnection of automotive electronic parts, the manufacturing quality of automotive rigid-flex board not only directly affects the reliability of electronic products, but also affects the overall competitiveness of system products, so it is called the "mother of electronic system products." To a certain extent, the development level of the printed circuit board industry reflects the development speed and technical level of a country or region's electronics industry.
The upstream raw materials for making PCB are mainly copper foil, copper balls, copper clad laminate, prepreg, ink and dry film, etc. The downstream application areas of PCB products are consumer electronics, communication equipment, automotive electronics, industrial control equipment, medical electronics, clean energy, and smart security., Aerospace and military products. The supply and price levels of upstream raw materials determine the production costs of PCB companies, and changes in downstream industries will directly affect the demand and price levels of printed circuit boards.
According to the printed circuit board, it can be divided into single-sided board, double-sided board, multi-layer board, HDI board, etc. according to the number of layers; according to the structure classification, it includes rigid board, flexible circuit board, flexible and hard board, etc. According to data released by Prismark, the three types of products that account for the largest proportion of global PCB output value are multilayer boards, flexible circuit boards, and HDI boards, and their output value growth rate is also leading.
The growth rate of output value reflects the situation on the supply side to a certain extent, but it is not suitable for judging the development prospects of corresponding products based on this. We believe that the largest market for HDI is the mobile phone market, and the industry's growth rate has slowed down. The profitability of ordinary HDI products is not optimistic.
HDI is the abbreviation of High Density Interconnector. HDI board is a circuit board with relatively high line distribution density using micro-blind and buried via technology. Because the most effective way to increase PCB density is to reduce the number of through holes, and accurately set blind holes and buried holes to achieve it, high-density integration (HDI) technology can make the design of terminal products more compact, while meeting the needs of electronic performance and efficiency. high standard. HDI is currently widely used in consumer electronics and IC substrates such as mobile phones, digital (camcorder) cameras, MP3, MP4, and notebook computers, among which the mobile phone market is the largest application market.
