The rapid development of society has led to the large-scale use of electrical appliances such as computers and televisions. The large-scale use of electrical appliances brings inevitable electromagnetic radiation. Everyone knows that electromagnetic radiation is very harmful to the human body, can cause cancer, can cause cardiovascular diseases, and so on. Among the many radiation sources, computer-generated radiation cannot be underestimated. But people are often concerned about the radiation from the display and ignore the radiation from the host.
Because the chassis of the host is a metal case, and the electromagnetic shielding effect produced by the metal case causes a large reduction in radiation, this is people's inertial thinking and fact. The case does play a significant role in preventing radiation, but if the case is not in place, the effect of preventing radiation is not so important. What problems should we pay attention to in terms of chassis radiation protection? Today the author summarizes a few points to share with you.
How to make the chassis absorb radiation more effectively? This depends on the material of the case. Now the cases on the market generally use galvanized steel, and some also use aluminum alloy plate. Although the iron plate chassis can also protect against radiation, the iron plate is easy to rust and the frame is not solid. Therefore, there are few iron plate chassis on the market, but some bad manufacturers also use iron plates in order to save costs.
The next thing we want to say is galvanized steel. Do people like galvanized steel just because it is strong and durable? the answer is negative. Because the surface layer of galvanized steel has a layer of metal zinc, the zinc's ability to absorb radiation is very strong. Some manufacturers paint or bake on both sides for aesthetic reasons. Because the paint is not a conductive metal, double-sided paint will weaken the radiation resistance of the chassis.
The anti-radiation ability of aluminum alloy is stronger than that of steel plate, which is due to the higher conductivity of aluminum alloy. However, there is an important problem that we cannot ignore, that is, the cost of aluminum alloy is relatively high, and some aluminum alloy cases also use blackening treatment, which further enhances the radiation protection ability, but the result is higher cost. . Therefore, the current aluminum alloy chassis on the market are generally in the high-end price.
Because aluminum has a relatively strong ability to absorb radiation, there is also a pure aluminum chassis on the market, but the strength of pure aluminum is significantly lower. In order to enhance the stability of the chassis, pure aluminum chassis plates are generally thicker, which also increases The cost of the chassis. So pure aluminum chassis is also expensive.
Next we want to talk about the gap between the chassis plate, the gap between the chassis plate is a major cause of radiation leakage. The first thing we should pay attention to is whether there is good contact between two adjacent metal materials. However, the gap between the side plates is difficult to achieve 100% contact, so anti-magnetic shrapnels and contact points have appeared on the market.
The design of the anti-magnetic shrapnel and contacts is also very important. The design of the contacts and the anti-magnetic shrapnel ensure that the side plates of the chassis make full contact with the rack, so that the chassis can become a whole in terms of conductivity.
After talking about the case gap, let's take a look at the face of the case. The face of the chassis generally has baffles such as optical drive and floppy drive. These baffles cannot be ignored. At present, some manufacturers also directly use plastic bezels in order to save costs, which obviously has a negative impact on radiation protection.
The optical drive baffle is best made of metal, preferably a punching net, on the one hand to prevent radiation, and on the other hand, it has a good effect on heat dissipation. This optical drive bezel cannot be underestimated, because its design is basically on the upper part of the chassis panel, in order to make it more convenient to use. However, if the optical drive is not used, the anti-radiation effect of the optical drive baffle is very important.
The role of the front panel of the chassis is also very important. It can block radiation from the inside of the chassis. However, some manufacturers now replace the front panel with a plastic material, and the radiation protection effect is greatly discounted.
It doesn't matter if you change to plastic material, you don't have to remove the open metal plate at the air inlet, and some manufacturers directly remove the metal mesh and replace it with a dust filter, which is also dustproof. The dust is protected, but most of the dust nets are made of nylon. The radiation protection effect of nylon is known to everyone on the planet. What I want to ask here is, does the perforated metal plate conflict with the air filter?
In order to dissipate heat, the chassis has multiple holes. The diameter of the opening is preferably around r / 30 (r is the wavelength), and generally less than 6cm. Currently, the heat dissipation openings on the market generally do not exceed 6cm, so don't worry about it. The shape of the heat dissipation holes is more critical. Generally, equilateral hexagons, squares, or equilateral triangles are used.
The heat dissipation openings of the chassis on the market are generally more qualified now. The next thing to say is that the large side is transparent. Some players usually choose a case with a large side and the accessories with colorful LED lights are installed inside. Cool.
Generally, the side penetration that players choose is made of acrylic material, and the author has a question here, is that such a large acrylic side penetration can block radiation? Players must also know that it is a great harm to radiation protection. Here, what I want to say to players is: are we to be beautiful and not healthy?