Novel coaxial cable and a manufacture method thereof for video security monitoring and control
A technology for video security and coaxial cables, which is applied in the manufacture of coaxial cables, coaxial cables/analog cables, insulated cables, etc., can solve the problem of damage to cable impedance characteristics and shielding characteristics, irregular conductor roundness, center conductors, and influence on cables. Problems such as reflection loss, to achieve the effects of easy standardized operation, lower impedance, guaranteed impedance characteristics and shielding characteristics
Active Publication Date: 2011-09-21
SHENZHEN LIANJIAXIANG SCI & TECH
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Problems solved by technology
Generally speaking, during the production process of traditional video security monitoring cables, there will be irregularities in the roundness of the conductors or the eccentricity of the center conductors (reducing the reflection loss that affects the cables, that is, impedance); and the deformation of the cables during construction destroys the impedance characteristics and shielding of the cables. feature issue
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[0030] refer to image 3 , the present invention is implemented like this:
[0031] exist image 3 Among them, a new type of coaxial cable for video security monitoring, including a conductor 20 and a sheath layer 10, the outer side of the conductor 20 is an inner insulating layer 30, and the outer side of the inner insulating layer 30 is provided with a metal shielding layer 50, the metal shielding layer Between 50 and the sheath layer 10, the polyurethane sol 40 is used for overall filling and shaping.
[0032] The sheath layer 10 is a PVC layer, and the gap between the PVC layer and the inner insulating layer 30 is completely filled with polyurethane sol 40 without air gaps.
[0033] The novel coaxial cable production method of above-mentioned video security monitoring is, at first make polyurethane sol 40, and the specific gravity of described polyurethane sol 40 is 1.14g / cm 3 , The opening time of polyurethane sol 40 is 35-60S seconds, the thickness is 0.03m, and the t...
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The invention relates to the field of cables for video security monitoring and control, in particular to a novel coaxial cable and a manufacture method thereof for video security monitoring and control. The novel coaxial cable comprises a conductor and a sheath layer, wherein the outer side of the conductor is an internal insulation layer, the outer side of the internal insulation layer is provided with a metal screen layer, and polyurethane sol is used to integrally fill and shape between the metal screen layer and the sheath layer. The invention has the advantages that the polyurethane sol is used for shaping and guarding between an external insulation layer of a signal line and the sheath layer as well as the screen layer to enable shaped coaxial cable to form integration, thereby improving the processing quality of the cable during the manufacturing process, reducing the degree of irregularity of the conductor or central conductor eccentric amount, and lowering return loss, namelythe impedance which affects the cable; and the method is easy to be standardized in construction, enables the appearance of the cable not to be damaged easily, and ensures the impedance and screen characteristics of the cable.
Description
technical field [0001] The invention relates to the field of video security monitoring cables, in particular to a novel coaxial cable for video security monitoring and a production method thereof. Background technique [0002] With the continuous progress of society, various industries are developing rapidly. Since Bell Laboratories in the United States invented coaxial cables in 1929, decades have passed. During this time, coaxial cables have undergone several improvements. The first generation of cables uses solid core materials as the filling medium. Because of its large attenuation of high frequencies, it is now mainly used to transmit video signals. Later, polyethylene was chemically foamed as a filling medium. Its foaming degree can reach 30%, and its high-frequency transmission characteristics have been improved. We call this the second generation cable. In the 1980s, the third generation of vertical hole lotus core cable appeared, and its high frequency attenuati...
Claims
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IPC IPC(8): H01B11/18H01B7/17H01B13/016
Inventor 黄冬莲
Owner SHENZHEN LIANJIAXIANG SCI & TECH