With the improvement of people's living standards, computers have gradually come into thousands of households. The computer brings people's life efficient and happy, but if you do not consciously protect and develop good habits of use, it will also damage people's health, the computer's electromagnetic radiation is one of the harmful factors.
Research by medical experts at home and abroad shows that long-term, excessive electromagnetic radiation will cause direct harm to the human reproductive system, nervous system and immune system, is the main cause of cardiovascular disease, diabetes, cancer mutation and cause pregnant women miscarriage, infertility, teratology and other pathologies of the triggering factors, and can directly affect the development of minors' body tissues and bones, causing vision, memory loss and Liver hematopoietic function decline, serious cases can lead to retinal fall. In addition, electromagnetic radiation is also a hidden danger to information security, the use of specialized signal receiving equipment can be received and deciphered, resulting in information leakage and loss. Therefore, electromagnetic radiation has become the fourth largest source of environmental pollution following the water, atmosphere, noise, how to protect against electromagnetic radiation has become a top priority.
Protection of computers from the hazards of electromagnetic radiation can be divided into active protection, passive protection of two methods. Passive protection method, that is, in addition to improving the working environment and pay attention to the use of methods, take to frequent contact and use of computers equipped with anti-radiation clothing, anti-radiation screen, anti-radiation curtains, anti-radiation glass and other measures to reduce electromagnetic radiation; active protection method, it is from the computer electromagnetic radiation "source" - monitor and chassis to start, how to protect against electromagnetic radiation has become an urgent matter. -- monitor and chassis to start, will be eliminated or shielded.
In terms of the chassis, its internal CPU, motherboard and its various plug-in cards (graphics cards, sound cards, network cards, etc.), optical drives, floppy drives, power supplies, and cooling fans, etc., in the work of the high (low) frequency electromagnetic waves, constituting the chassis of the radiation source. Electromagnetic waves are not only harmful to the human body, but also affect the chassis hardware and the work of the surrounding electrical appliances, not conducive to the stability of the computer. Traditional ABS engineering plastics and ordinary steel plate composed of cheap chassis, its electrical, anti-electromagnetic interference performance is very poor, it is difficult to play the heavy responsibility of anti-radiation. In order to minimize electromagnetic radiation, to meet people's health requirements, the major chassis manufacturers have launched in line with CISPR22, EMI, CE, FCC, TUV, CCC and other anti-electromagnetic radiation interference standard radiation chassis, to create a new concept of green environmental protection, radiation-free health chassis.
Overall the so-called "anti-radiation chassis", their "masterpiece" is mainly in the chassis materials, production process, chassis power supply, structural design and circuit protection and so on the use of many new technologies.
From the chassis material, there are mainly EG (electrolytic galvanized steel), GI (pyrolytic galvanized steel), SECC (cold galvanized steel), as well as magnesium-aluminum alloys and other kinds. Ordinary chassis more than the use of thin general steel or EG rolled and become, while the radiation chassis produced by large factories are used after special treatment of GI, SECC and even magnesium-aluminum alloy materials to produce, and the thickness of the plate more than the requirements of more than 1mm (FCC and CE standards specify the minimum threshold of 1mm). Compared with the former, the latter has a strong adsorption of high and low-frequency electromagnetic waves and high shielding, high conductivity, but also has a good rigidity, not easy to rust, corrosion resistance, etc., and some large manufacturers have even developed a lighter weight, higher hardness, thermal conductivity, and better as well as in the rust and shielding of electromagnetic radiation in the magnesium-aluminum alloy material chassis more powerful.
In addition, because the resin component contained in the paint will oxidize the metal surface and destroy its radiation protection ability, so in the radiation protection chassis interior, including all the structural stress points and shell steel plate are not spray paint treatment. All of these, EMI (electromagnetic radiation) to play a better shielding and protection effect, is conducive to ensuring the stability of the system.
From the production process, radiation-proof chassis is mainly in the chassis closure, chassis cooling holes, mold making and other aspects of effort. To ensure that the box structure has good sealing, first of all, manufacturers should have a high level of mold design and production capabilities, so that the precision of the chassis mold dimensions are very high, stamping molding workpiece in order to achieve a high level of sealing requirements in the assembly, so that the chassis panels and the body of the combination of the line is completely seamless; Secondly, the chassis base, front and rear (side) baffles, the top cover, as well as the front USB and audio ports, etc., and the seams should be less than 0.8mm, with radiation bullet points, radiation reinforcement rods, radiation slots, etc. and side panels rolled edge design to block electromagnetic radiation from leaking out of the gaps in the chassis, and at the same time, make the side panels and the chassis fixed more tightly.
And in the prevention of electromagnetic radiation has an important role in the chassis cooling holes, but also not the more holes the bigger the better. Ideal aperture size for r/30 (r for the wavelength), such a hole can meet the chassis cooling needs, but also can effectively prevent electromagnetic radiation.
From the chassis power supply, because it is an important source of electromagnetic radiation in the chassis, in order to minimize the radiation, radiation-proof chassis in addition to with through the FCC, UL, CE, CSA, and CCC and other standard certifications, stable performance, long service life, radiation degree of excellence of the power supply, there are also part of the manufacturer also in the power supply holes in the chassis with the addition of anti-radiation bullet point design, effectively Shielded the power of the weak radiation, and to ensure that the chassis with the special anti-magnetic speakers or buzzer.
Additionally, the best measure to defend against electromagnetic radiation is to make it form a good grounded outlet, so that it disappears into the invisible. Therefore, anti-radiation chassis through the scientific design of the chassis space structure, combined with a unique chassis mold stamping production process and chassis steel characteristics, to ensure that the chassis inside such as USB and other radiation-generating accessories get a good electromagnetic circuit protection, the chassis overall grounding performance is excellent, to maximize the electromagnetic radiation to reduce or disappear