76results about How to "Good electromagnetic shielding function" patented technology

A plug connector is for connecting to a receptacle connector. The receptacle connector comprises two resilient plates. The plug connector has an insulating housing and a metal shell. The insulating housing includes a tongue portion and a base portion for accommodating and connecting the terminals. The metal shell has a top plate, bottom plate, and two side plates. Multiple recesses, protrusions or elongated recesses are selectively formed on at least one of the top plate, the bottom plate for connecting the resilient plates. These can avoid electromagnetic interference, dusts or any external substances from attaching to the insulating house and also ensure a high quality of the insertion force and the extraction force after frequent uses.

Electromagnetic shielding about both of electric connectors, which are in a mutually mated state, can be sufficiently carried out by a simple configuration. Shield wall portions composed of electrically-conductive members opposed to contact connecting portions (board connecting portions) of a plurality of contact members arranged in multipolar shapes are provided; electromagnetic shielding functions with respect to the contact connecting portions in the respective electric connectors are obtained well by the respective shield wall portions; and, when both of the electric connectors are mated with each other, the shield wall portions are configured to be in an inner/outer double disposition relation in which they are opposed to each other and efficiently block the gaps between the shield wall portions and wiring boards so that sufficient EMI measures can be expected.

The invention relates to a method for preparing nylon-PEDOT (poly(3,4-ethylenedioxythiophene)) compound conductive fabric through in-situ polymerization. The method comprises the following steps of: 1) pretreating a nylon fabric by using acidic solution, and padding the nylon fabric for times, wherein the dipping time is 5-15 minutes and the padding residual rate is 60-90 percent; and 2) dipping the nylon fabric in mixed solution containing ferric chloride, sodium polystyrenesulfonate and 3, 4-ethylenedioxythiophene (EDOT), keeping reaction temperature to be 30-90DEG C, keeping reaction time to be 1-20h, and after reaction is ended, taking out, washing and drying the fabric to obtain the nylon-PEDOT compound conductive fabric. By adopting the method, in combination with a padding technology which is commonly used for dyeing and finishing, the PEDOT can be enabled to rapidly enter the internal part of nylon fibers, the reaction time is shortened and the environmental pollution is small; and the nylon-PEDOT compound conductive fabric can be applied to the fields of textile chemical sensing and biological remediation materials, electromagnetic shielding materials and the like.

The present invention proposes an improved structure for preventing electromagnetic interference (EMI) of a central processing unit (CPU), which structure includes a base, a shielding element, at least a first pin, and at least a second pin. The present invention is characterized in that fixing pins are formed by extending downwards two opposite sides of the shielding element. When the shielding element is closed, it can be firmly gripped at two sides of the base via the fixing pins thereof. Because the shielding element can be steadily closed, the lapping parts thereof can contact exactly with the main body of the second pin so that the second pin can be electrically grounded with the motherboard. Therefore, better electromagnetic shielding function can be achieved. Moreover, the bottom ends of the solder parts of the first pin and the second pin are bent to form flat shapes so that solder parts thereof can be soldered on the motherboard by using the surface mounting technique. The first pin and the second pin need not be plugged into the motherboard so that connection holes are no longer required on the motherboard. Therefore, the circuit layout of the motherboard will not be influenced.

The invention discloses a long-carbon-fiber-reinforced nylon composite material with electromagnetic shielding function and a preparation method thereof. The composite material is composed of the following components in percentage by mass: 40-80 wt.% of nylon resin, 20-45 wt.% of long carbon fiber, 2-8 wt.% of alloy powder, 2-10 wt.% of maleic anhydride grafted low-density polyethylene (LDPE-g-MAH) and 0.1-2 wt.% of antioxidant. The preparation method of the composite material comprises the following steps: proportionally and uniformly mixing the nylon, alloy powder, LDPE-g-MAH and antioxidant, carrying came out melt blending on a double screw extruder, and directly extruding the melt into a dipping mold; sending the fiber bundle subjected to surface treatment into the cavity of the dipping mold under the action of tension to sufficiently dip the melt; and pulling the dipped fiber bundle out of the mold, cooling, and granulating to obtain the strip-shaped granules of which the length is 10+/-0.2mm. The composite material disclosed by the invention has the specific function of shielding high/low-frequency electromagnetic waves, and has excellent mechanical properties which are peculiar to long-fiber-reinforced plastics.

The invention discloses a method of copper and iron alloy materials for novel motor rotors, and belongs to the technical field of nonferrous metal material manufacturing. The method mainly comprises the steps of (1) burdening, (2) vacuum induction smelting, (3) mechanical centrifugal atomization, (4) discharge plasma sintering and (5) aging. Cu and Fe raw materials with higher purity are selected,fed silver is excellent in electric conductivity, and meanwhile, iron, silicon and copper are lower in solid solubility, so that the influence on electricity and heat conductivity of copper rods is lower, the solid solubility cannot be changed along with the temperature change, and alloys formed by Cu and Fe achieve higher electric conductivity; and through the mechanical centrifugal atomizationmode, Cu-Fe alloys are atomized as drops, and the drops are quickly condensed through low-temperature and high-purity argon, so that the cooling speed of the alloy drops can be accelerated, the macroscopic segregation of the alloys is overcome, and the electromagnetic shielding performance of the alloys is further improved.

The invention relates to a preparation method of an electrostatically-spun polyimide/MXene electromagnetic shielding film. The method comprises the steps that diamine monomers, dianhydride monomers and a solvent are mixed and stirred for a reaction, an obtained polyamide acid solution is mixed with an MXene solution, and the mixed solution is subjected to ultrasonic treatment, deaeration, electrostatic spinning and cyclization. According to the method, raw materials are safe and environmentally friendly, and industrial application and popularization are facilitated; and the obtained polyimide/MXene electromagnetic shielding film has excellent mechanical strength, corrosion resistance, irradiation resistance, heat resistance, electrical conductivity, electromagnetic shielding function and other characteristics.

The invention discloses a natural graphite/metal-layer composite heat sink. The natural graphite/metal-layer composite heat sink comprises a metal layer and natural graphite layers, wherein the natural graphite layers are arranged on the upper surface and the lower surface of the metal layer, a plurality of round holes are uniformly formed in the metal layers, the diameters of the round holes are 0.2-0.6 millimeter, the distance between the round holes is 0.4-1.0 millimeter, upward or downward burrs are arranged at the edges of the round holes, the natural graphite layers are engaged with the metal layer by the burrs, the round holes are filled with natural graphite, and the thickness of the composite heat sink is 18-2,000 micrometers. Through the above mode, the natural graphite/metal-layer composite heat sink is a favorable heat conduction carrier, has a high heat conduction effect and also has a high electromagnetic shielding function.

A coating layer, an optical filter formed by the coating layer, a polymer film, and an optical filter formed by the polymer film have a selective absorbing function and electromagnetic wave shielding function which are superior with respect to visible rays and near infrared rays. The coating layer and optical filter formed thereby are formed by a coating composition which contains rod-shaped metal particles (metal nanorods) whose main axis is less than 400 nm and whose aspect ratio is larger than 1, and which contains, in accordance with need, a dye, a pigment having a selective absorbing function in a wavelength range of 780 nm or less, and metal nanowires whose main axis is 400 nm or more and whose minor axis is 50 nm or less. The polymer film is formed by the aforementioned coating composition which is dispersed in a binder (resin).

The invention discloses a DFN packaged digital infrared temperature sensor. The sensor comprises a DFN packaging shell with a window in the top, a thermopile, a TC template and an ASIC module are arranged in the DFN packaging shell, an infrared optical filter is arranged at the window of the DFN packaging shell, and a closed space is defined by the infrared optical filter and the DFN packaging shell; the DFN packaging shell is provided with an air guide hole and an exhaust hole, the bottom of the DFN packaging shell is provided with a pin, and the inner wall of the DFN packaging shell is provided with a metal shielding layer and a SiO2 film. The DFN packaged digital infrared temperature sensor has the advantages of miniaturization, low cost, high electromagnetic shielding efficiency, highmeasurement precision, high readability, simple forming process, suitability for large-scale production and wide application.

The invention relates to the technical field of heat conduction and wave absorption, in particular to a high-thermal-conductivity and wave-absorbing shielding gasket and a production process thereof.The high-thermal-conductivity and wave-absorbing shielding gasket comprises a heat-conducting wave-absorbing base material, a release film and a metal layer, the heat-conducting wave-absorbing base material covers the outer surface of the metal layer, the release film covers the outer surface of the heat-conducting wave-absorbing base material, and the heat-conducting wave-absorbing base materialis prepared from heat-conducting powder and magnetic powder. The high-thermal-conductivity wave-absorbing shielding gasket disclosed by the invention not only has excellent thermal conductivity and wave-absorbing performance, but also has good operability and an electromagnetic shielding function, can be widely applied to shielding electromagnetic noise generated by a CPU, an FPC, a digital camera, a microphone, an RAM, an antenna, a component and the like, and can also play a role in heat conduction; and meanwhile, the metal layer in the middle of the product can also realize the omnibearingheat conduction and electromagnetic shielding effects of the material.

The invention provides a preparation method for a polyimide three-layer composite film with an electromagnetic shielding function. When carbon nanotubes are employed for modification of a polyimide film, the resistivity of the polyimide film can be effectively reduced; however, with increase of the content of the carbon nanotubes, the carbon nanotubes are substantially agglomerate in polyimide, which leads to drastic decrease of the mechanical properties of the polyimide film. The preparation method provided by the invention comprises the following steps: (1) preparation of a carbon nanotube-modified polyamide acid solution; (2) preparation of a carbon nanotube-modified polyamide acid microporous film by using an electrostatic spinning method; (3) preparation of a polyamide acid solution; (4) coating of two sides of the microporous film with the polyamide acid solution; and (5) thermal imidization of a prepared carbon nanotube-modified polyimide acid three-layer composite film. The polyimide three-layer composite film prepared in the invention is mainly applied to broaden the application scope of polyimide films in the field of electromagnetic shielding materials.

The invention discloses a graphite, metal foil, and foam buffer composite cooling fin, which comprises a graphite layer and a metal foil layer. A layer of circular double-faced foam glue is adhered on one surface of the graphite layer, the metal foil layer is adhered on the other side of the graphite layer through a double-faced adhesive tape, and a layer of circular double-faced foam glue is adhered on the surface of the metal foil layer. Through the technical scheme mentioned above, the cooling fin has a good thermal conductivity, can radiate heat rapidly, and is capable of effectively shielding the interference signals.

The invention relates to an electromagnetic shielding geopolymer composite material, and a preparation method and an application thereof. The composite material comprises 30-40 wt% of aluminosilicateminerals, 20-40 wt% of an alkali, 30-40 wt% of water and 1-10 wt% of an organic silicon modified conductive filler. The method comprises the following steps: dispersing a conductive filler subjected to acid pretreatment and organic silicon into a mixed solution, stirring, mixing the obtained organic silicon modified conductive filler with an alkaline solution, adding the aluminosilicate minerals,stirring, and curing. The geopolymer raw materials adopted in the method are wide in source, low in cost, environmentally friendly and recyclable, and the prepared geopolymer composite material has anexcellent electromagnetic shielding function.

The invention discloses an electromagnetic shielding cabinet for an indoor split type intelligent constant temperature air-conditioner. The electromagnetic shielding cabinet for an indoor split type intelligent constant temperature air-conditioner includes a cabinet body, wherein a first separator plate and a second separator plate are respectively and fixedly arranged in the cabinet body from top to bottom; the top of the second separator plate is provided with an air-conditioning unit; the bottom of the air-conditioning unit is fixedly connected with a fixed mount; the bottom of the fixed mount is fixedly arranged at the top of the second separator plate; and the air-conditioning unit is electrically connected with one side of an electromagnetic shielding instrument through a cable conductor at one side of the air-conditioning unit. By setting the electromagnetic shielding instrument, fan blades and an electromagnetic shielding layer, and by installing the electromagnetic shielding instrument and the electromagnetic shielding layer in the cabinet body, the electromagnetic shielding cabinet for an indoor split type intelligent constant temperature air-conditioner can effectively restrain leakage of electromagnetic information and prevent external strong electromagnetic disturbance. By starting a motor to drive a rotation frame so as to drive a condenser tube to rotate, the condenser tube is circulated to cool the air-conditioning unit; and a driving gear drives a driven gear to rotate so as to drive a second rotating shaft to drive the fan blades to rotate so that the air-conditioning unit can be cooled comprehensively.

The invention provides an integrated navigation system which is characterized by comprising gyroscopes, accelerometers, a navigation computer, a power panel, a satellite receiver, an external connector, a mounting frame, an outer cover and a base. The gyroscope, the accelerometer, the navigation computer and the satellite receiver are all installed on the mounting frame or the base, the external connector is installed on the outer cover, the mounting frame is installed on the base, the outer cover is arranged on the outer side of the mounting frame in a sleeving mode, and an opening of the outer cover is in butt joint with the base. The external connector penetrates through the outer cover, a conductive sealing gasket is installed on the inner side of the assembling position of the external connector and the outer cover, and a conductive sealing ring is installed at the position where the opening of the outer cover is in butt joint with the base. Through the arrangement of the conductive sealing gasket and the conductive sealing ring, the sealing of the cavity defined by the outer cover and the base is ensured, so that the electromagnetic shielding capability can be effectively improved.

The invention discloses a self-adhesive waterproof roll with an electromagnetic shielding function. The self-adhesive waterproof roll comprises an isolation layer, a butyl pressure-sensitive self-adhesive layer, a matrix layer, a butyl pressure-sensitive self-adhesive layer and an isolation layer in sequential lamination. Each butyl pressure-sensitive self-adhesive layer is prepared from, by weight, 5-30 parts of butyl rubber, 5-40 parts of a tackifier, 10-60 parts of a plasticizer, 10-40 parts of nano conductive filler, 10-50 parts of a reinforcing agent, 1-10 parts of a nano activating agent, 0.5-5 parts of a chemical coupling agent, 1-5 parts of an antioxidant and 1-5 parts of a light stabilizer. The self-adhesive waterproof roll with the electromagnetic shielding function is excellentin water resistance, aging resistance and shielding effectiveness, hot melting construction and asphalt smoke are avoided, and harms to human bodies and environments are avoided.

The invention provides a cutting-resistant glove processing technology, and relates to the field of labor protection gloves. The cutting-resistant glove processing technology includes the steps: glovecore preparation; glove core coating. Inner yarns and outer yarns are interwoven to form a glove core, polyethylene fibers with super-high relative molecule weight and bamboo-carbon modified polyester fibers wrap carbon fibers to form the outer yarns, and polyethylene fibers with super-high relative molecule weight and nylon fibers spirally wrap polyurethane filaments to form the inner yarns. A coating method of the glove core particularly includes the step: coating a composite material outside the woven glove core. The cutting-resistant glove processing technology is simple, large-scale automation production can be achieved, a processed cutting-resistant glove has excellent cutting resistance, comfortable and portable to wear and long in service life, hand flexibility is good, and replacing frequency is reduced.

The invention discloses a superfine fiber synthetic leather with performance of electromagnetic radiation prevention and a production method thereof. Sea-island fiber non-woven fabric serves as a basic material, chitosan-modified graphene emulsion is adopted to dip the sea-island fiber non-woven fabric, and after being subjected to liquid squeezing, the sea-island fiber non-woven fabric is dried through a dryer to obtain pretreated base cloth A; the pretreated base cloth A serves as a basic material, waterborne polyurethane emulsion is adopted to dip the pretreated base cloth A, and after being subjected to liquid squeezing, the pretreated base cloth A is dried through the dryer to obtain pretreated base cloth B; the pretreated base cloth B serves as a basic material, the steps are repeated, and the superfine fiber synthetic leather is obtained simply through a decrement process and an after-finishing process. By means of the superfine fiber synthetic leather with the performance of electromagnetic radiation prevention and the production method thereof, environment-friendly materials and superposed composite technologies are completely adopted, the obtained superfine fiber synthetic leather has good physical and mechanical performance, within the frequency range of 30 MHz-1.5 GHz, the electromagnetic shield effect can reach 35 dB or so, and the superfine fiber synthetic leathercan be applied to the electrical and electronic industries, and can also serve as a novel material for protective clothing and tents.