An aldehyde is an organic compound containing a functional group with the structure −CHO, consisting of a carbonyl center (a carbon double-bonded to oxygen) with the carbon atom also bonded to hydrogen and to an R group which is any generic alkyl or side chain. The group-without R-is the aldehyde group, also known as the formyl group. Aldehydes are common in organic chemistry. Our main aldehyde products are Formaldehyde and paraformaldehyde.
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Judging from the products on the market today, the anti-riot cameras are mostly hemispherical or spherical. Therefore, the transparent protective cover of the camera and the manufacturing process of the upper casing become the key to the camera's anti-riot ability. Jiang Feng of the sales department of Changzhou Yuhua Electronic Equipment Manufacturing Co., Ltd. introduced that the built-in camera of the riot camera is basically the same as the ordinary camera. In order to meet the requirements of anti-violence (anti-knock, anti-smash, anti-shock), more and more products The transparent protective covers are made of polycarbonate (pc) engineering plastics, and some manufacturers use polymethyl methacrylate (pmma) engineering plastics (acrylic, acrylic) ball covers. Zhang Zhiyong, project manager of jvc (China) Investment Co., Ltd., said that unlike the polymethyl methacrylate engineering plastic ball cover commonly used in ball machines, polycarbonate engineering plastic ball covers are not very good in transparency, but have good impact resistance. Much more.
In addition, it should be noted that, according to some manufacturers, in order to make some high-intensity anti-riot cameras have better impact resistance, the thickness of the polycarbonate (pc) engineering plastic dome is strengthened, so that the transparency is more polymethyl. The luminous flux of the PC ball cover with a poor pmma dome mask affects the image quality to a certain extent. If the thickness is increased, it is more difficult to achieve uniform smoothness in the manufacturing process, and the optical distortion of the image may also occur.
The impact protection of the transparent shield is solved, but the rest of the camera is also subject to damage, so the robustness of the dome and the dome camera base is equally important. Fu Yuying, a sales engineer at Pelco's Shanghai office, said that the bases of most ball-type riot cameras are now made of cast aluminum casing, which is resistant to the impact of general strength. In addition, some manufacturers have added some special devices to the riot camera products, such as Panasonic's wv-cw470a riot camera, which uses a spring structure at its camera lens to make it have a telescopic function, which is buffered by the elasticity of the lens. External shocks protect the fragile components inside the camera for proper operation.
In addition to special considerations for the anti-strike capability of the hood, the riot camera also takes into account the tamper resistance of the riot camera.
Because the anti-riot camera has better impact resistance, some criminals will try to break the casing and try to break the movement directly after attempting to destroy the casing. Therefore, the hood of the riot camera must not only have certain impact resistance, but also must have Tamper performance. The hex cap screws are used on the hood of the general riot camera. It is difficult to open without using a professional screwdriver. In addition, it is understood that the products of individual manufacturers on the market also use a lockable openable cover to achieve the tamper-proof function.
The basic knowledge of riot camera
[ Huaqiang Security Network News ] In today's life, surveillance cameras are more and more widely used. In some financial and judicial places, criminals will destroy surveillance cameras in order to avoid the law. In this case, the riot camera should be shipped. Born. Anti-riot cameras are also called high security cameras, anti-shock cameras, anti-strike cameras, and anti-vandal cameras. As the name implies, the riot camera is a camera that can still ensure the normal operation of the components under the external violence. The characteristic is that the outer casing has strong impact resistance.