16results about How to "Reduced shielding" patented technology

The invention relates to the technical field of PVB heat-insulating films, in particular to a PVB heat-insulating film based on indium tin oxide and bronze cesium tungsten compounding and a preparation method thereof.The PVB heat-insulating film is prepared from, by weight, 80-120 parts of PVB resin, 20-50 parts of oily plasticizer, 0.1-2.0 parts of silane coupling agent, 0.1-1.0 part of antioxidant, 0.1-1.0 part of ultraviolet light absorber, 1-5 parts of polyethylene glycol derivative and 1-5 parts of compound dispersion slurry, the weight ratio of the indium tin oxide powder to the bronze cesium tungsten powder in the compound dispersed slurry is (5: 5)-(7: 3). According to the PVB heat-insulating film based on indium tin oxide and cesium tungsten bronze compounding and the preparation method, the prepared PVB heat-insulating film has high visible light transmittance and excellent near-infrared light rejection rate, meanwhile, the Faraday cage effect can be effectively avoided, and the signal shielding problem is avoided.

The utility model relates to an anti-condensation heating control device and a refrigerator. The anti-condensation heating control device comprises a control module and a condensation detection module. The control module comprises a comparator and a relay, the first output end of the comparator is electrically connected with the relay, and the relay is electrically connected with the heating device; the moisture condensation detection module comprises a first moisture condensation detection unit and a second moisture condensation detection unit, the first moisture condensation detection unit is electrically connected with the first input end of the comparator, and the second moisture condensation detection unit is electrically connected with the second input end of the comparator; the first condensation detection unit is used for detecting the surface humidity of cabinet door glass and outputting a first voltage to the comparator; the second condensation detection unit is used for detecting environment humidity and outputting a second voltage to the comparator; the comparator is used for controlling on or off of the relay. Through the arrangement, compared with a single chip microcomputer, the comparator has the advantages of being low in price and high in anti-interference performance, the requirements for the performance of a power supply, electromagnetic shielding and heat dissipation of the whole machine are lowered, and the cost of the whole machine is lowered.

The utility model relates to the technical field of shielding materials, and discloses a shielding structure, a cable and an electronic product. The shielding structure comprises a polyimide film layer and a conductive cloth layer, the polyimide film layer and the conductive cloth layer are bonded through an acrylic adhesive layer, a conductive adhesive layer is attached to the side, away from the acrylic adhesive layer, of the conductive cloth layer, and the overall thickness T after the polyimide film layer, the acrylic adhesive layer, the conductive cloth layer and the conductive adhesive layer are attached is smaller than or equal to 0.04 mm. The cable comprises a conductive wire and a shielding structure, and the shielding structure is pasted and coated on the outer side of the conductive wire. The electronic product comprises a first main body and a second main body which are rotationally connected, and the first main body and the second main body are electrically connected through a cable. According to the utility model, the shielding performance, wear resistance and bending durability of the shielding structure are improved, the thickness does not exceed 0.04 mm, the shielding structure can bear 500,000 times of rotating friction without being damaged and layered, and the shielding structure still has high shielding performance and conductivity.

The application relates to the solid state disk packaging technical field, in particular to a solid state disk packaging structure combined with an electromagnetic shielding function, which comprises a packaging shell, an internal shielding component and an interface shielding device. The inner wall of the packaging shell is provided with a conductive coating, the internal shielding component forms a shielding network with a shielding partition plate and a conductive elastic piece, and the interface shielding device adopts a shielding cover, a conductive adhesive tape and a signal filter to realize double shielding protection. Through the design of the conductive cloth layer, the conductive elastic piece and the conductive adhesive tape, external electromagnetic interference is effectively blocked, internal component layout changes are adapted, meanwhile, the signal transmission stability and the heat dissipation performance are enhanced, and the equipment operation reliability is improved.

This invention provides a follow-up clamping device for providing vortex gas to a laser welding head to protect the workpiece being welded. The follow-up clamping device includes: a clamping body having a conical inner cavity; a connecting member, one end of which is connected to the laser welding head; and an annular gas supply member, through which gas is introduced from the large opening side of the conical inner cavity, converges and forms a vortex-like converging airflow within the conical inner cavity, and is then ejected from the small opening side of the conical inner cavity, suitable for spraying towards the workpiece being welded. This invention solves the problems of unstable gas protection and the existence of protection dead zones in existing technologies, as well as the problem of severe plasma shielding effects affecting welding depth and energy transmission in existing technologies. It also solves the problem of existing laser welding clamping mechanisms obstructing airflow and causing protection blind zones.

The invention discloses a segmented polycrystalline silicon deep groove silicon carbide MOSFET, and belongs to the technical field of semiconductor power devices. According to the device, a P + polycrystalline silicon section connected with a source electrode, a lightly doped Npolycrystalline silicon section and an N + polycrystalline silicon section connected with a grid electrode are sequentially arranged in a deep groove in the depth direction, and the P + polycrystalline silicon section, the lightly doped Npolycrystalline silicon section and the N + polycrystalline silicon section jointly form a polycrystalline silicon diode structure similar to a PIN. The P + polycrystalline silicon section at the bottom of the groove is used for shielding an electric field, the gate-drain coupling capacitance (Cgd) is effectively reduced, and the switching characteristic of the device is improved; meanwhile, by utilizing the characteristic that the reverse leakage current of the PIN structure is obviously increased under the short-circuit temperature rise, the self-adaptive reduction of the gate-source voltage (Vgs) is realized through gate loop resistance voltage division, so that the short-circuit current is inhibited. While voltage resistance and conduction performance of the device are ensured, short-circuit endurance capability and safe turn-off reliability of the device are remarkably improved.

The utility model discloses a booster-level flame-retardant low-intermodulation feeder line, and relates to the technical field of cables. The booster-level flame-retardant low-intermodulation feeder line comprises an inner conductor, an insulating layer, an outer conductor and a sheath which are coaxially arranged from inside to outside, the outer conductor is a spiral corrugated metal tube, the insulating layer is made of low-density polytetrafluoroethylene with a fibrous microporous structure, and the sheath is made of booster-level flame-retardant fluorinated ethylene propylene; the booster-level flame-retardant low-intermodulation feeder line provided by the utility model has the characteristics of high temperature resistance, high flame retardance, high shielding, low loss, low passive intermodulation and super-flexible bending, is suitable for booster-level cables or cable assemblies of a UL system, and is particularly suitable for interlayers of ceilings and high-flame-retardant safe application occasions of super-flexible wiring connection.

The invention discloses an oil-in-water emulsion workover fluid and a preparation method thereof, and relates to the technical field of workover fluids, the oil-in-water emulsion workover fluid comprises the following raw materials by weight: 28-30 parts of water, 65-67 parts of white oil, 3-5 parts of a modified sorbitol-based emulsifier, and 2-4 parts of a modified sodium polyacrylate thickener. According to the modified sorbitol-based emulsifier prepared by the invention, the high temperature resistance is improved, the salt tolerance of the modified sodium polyacrylate thickener at high temperature is enhanced, and the oil-in-water emulsion workover fluid can be endowed with relatively strong high-temperature stability.

The utility model discloses a motor controller and electrical equipment, and the motor controller comprises a box body, a structural member and a low-voltage interface board, the structural member is arranged at the opening side of the box body, the side, facing the box body, of the structural member is provided with a bump, the low-voltage interface board is located between the box body and the structural member, and the side, facing the structural member, of the low-voltage interface board is provided with a copper layer. The salient points are at least partially located in the copper layer. According to the scheme provided by the invention, electromagnetic shielding of the low-voltage interface board is realized by directly utilizing the matching of the salient points on the structural member in the motor controller and the copper layer, an additional shielding cover is not needed, and the product weight and the product cost are reduced; moreover, the assembly of the shielding case is reduced, the assembly time is saved, and the production efficiency is improved. Meanwhile, after the shielding cover is removed, safety gaps between the shielding cover and the two sides can be reduced, the size of the product is reduced, and the power density of the product is improved.

This invention discloses a dual-laser-beam diamond synchronous polishing device and method, relating to the field of semiconductor material laser processing technology. The device includes: a laser generator for generating pulsed laser light; a homogenization and shaping unit for homogenizing and shaping the pulsed laser light to obtain a square-topped laser spot; a multi-path processing unit for dividing the homogenized and modulated pulsed laser light into two sub-pulse laser beams with different energy ratios and different incident angles on the diamond surface; and a three-dimensional motion platform for carrying the diamond and controlling the relative motion between the diamond and the two sub-pulse laser beams. The laser spots of the two sub-pulse laser beams overlap on the diamond surface along the scanning path. Based on a set scanning speed and scanning line spacing, the diamond is scanned and polished according to the scanning path. This method achieves simultaneous generation and removal of graphitization using a single-source dual-beam system, reducing the number of scans, lowering processing time, and improving processing quality.

The application provides a trim glass, a column assembly and an automobile, relates to the technical field of glass products, and the trim glass comprises a diffusion layer and a glass body, the diffusion layer has a set roughness and is arranged on one side of the glass body, the thickness of the glass body is 2.1 mm to 3.5 mm, the total iron content of the glass body is 0.00005% to 0.12%, the contents of cobalt, chromium and selenium are substantially zero, and the difference between the millimeter wave loss rates when the trim glass is placed and when the trim glass is not placed is 3.15 db to 5.47 db. The application reduces the metal shielding effect, so that the millimeter wave loss rate when passing through the trim glass is reduced, meanwhile, by adding a certain amount of TiO2, the problem that the coloring effect of the trim glass is deteriorated due to the reduction of metal content and the ultraviolet transmittance is improved is solved. The trim glass can better adapt to the millimeter wave radar and improve the detection performance of the millimeter wave radar.

The utility model relates to an adjustable ventilation window for electromagnetic compatibility test belongs to the technical field of electromagnetic compatibility test, it adopts the net board body of circular, the body is by multiple group sector region constitutes, including big aperture vent area and small aperture vent area, through the shielded plate of central pivot linkage symmetry, can select the big hole or small hole area when rotating, realizes the dynamic regulation of shielding effectiveness and ventilation efficiency, the utility model discloses compact overall structure, easy operation makes the ventilation volume and shielding effectiveness adjustable.

This utility model discloses an electrolyzer for a water electrolysis hydrogen production device, comprising a tank body and a sealing cover. A front-end plate is located on the left side of the tank body, and a rear-end plate is located on the right side. Multiple bipolar plates are fixedly arranged at intervals inside the tank body. Between adjacent components—between the front-end plate and the first bipolar plate, between each bipolar plate, and between the last bipolar plate and the rear-end plate—a porous anode electrode, a diaphragm, and a porous cathode electrode are sequentially sandwiched, forming multiple electrolysis chambers. Each electrolysis chamber has an electrolyte inlet at its rear and an anolyte outlet and a catholyte outlet at its front, corresponding to the anode and cathode flow fields, respectively. This utility model provides a short-range, directional flow channel for each reaction unit by setting independent electrolyte inlets and anolyte outlets at the front. This design ensures that the electrolyte can be rapidly and uniformly supplied to each electrode surface, improving current efficiency and saving energy.

This application discloses a three-terminal vertical nano-air channel optoelectronic device, belonging to the field of micro / nanoelectronic and optoelectronic device technology. The device includes a substrate, a first electrode, a semiconductor photocathode, an insulating layer, a second electrode, and a third electrode. The first electrode is located on the upper surface of the substrate; the semiconductor photocathode is located on the upper surface of the first electrode; the insulating layer extends to cover the edge region of the upper surface of the semiconductor photocathode, forming an exposed active region in the center of the semiconductor photocathode; the second electrode is located on the upper surface of the semiconductor photocathode and forms direct electrical contact with the semiconductor photocathode, at least in the active region, and also includes a first independent bias port; the third electrode is suspended above the second electrode and forms a nano-air channel with the second electrode, and also includes a second independent bias port. This application utilizes a three-terminal independent bias architecture to achieve electrical decoupling between the high-speed drift transport of charge carriers within the semiconductor and the efficient electron extraction / emission process of the air channel, thereby obtaining higher emission efficiency, faster response speed, and superior optical stability.

The application discloses an electric surfboard, comprising a board body, a battery module, a driving module, a control module and a communication module; wherein the driving module is detachably connected with the board body; the control module is arranged in the driving module or in the board body, and the control module is electrically connected with the driving module and the battery module; the communication module is arranged in the board body and is sealed, and comprises a first antenna assembly, a radio frequency feed line and a second antenna assembly; the first antenna assembly is arranged on a part of the board body extending out of the water surface and / or close to the water surface, and is used for wireless communication connection with a control terminal; the second antenna assembly is close to the control module and is in wireless communication connection with a communication terminal in the control module; and the first antenna assembly and the second antenna assembly are connected through the radio frequency feed line. The application solves the problems of power supply, complex line design, high manufacturing cost and reduced waterproofness caused by the mode of arranging a communication relay and a communication module on the board body in the related art.

The application discloses a multi-core combined lightning protection cable and relates to the technical field of power cables, which comprises a first framework, a plurality of fins are fixedly arranged on the inner side of the first framework, a second framework is arranged between the fins on the inner side of the first framework, the inner space of the first framework is divided into a first circulating cavity and a second circulating cavity through the second framework, the first circulating cavity and the second circulating cavity are filled with cooling liquid, a plurality of first electric cores are embeddedly arranged on the outer side of the first framework through twisting, a second electric core is arranged between adjacent first electric cores through twisting, an aluminum foil shielding layer is arranged on the outer side of the first electric core and the second electric core, a heat insulation layer is arranged on the outer side of the aluminum foil shielding layer, and a silk screen braiding layer is arranged on the outer side of the heat insulation layer. The first electric core and the second electric core are used for power conduction, the aluminum foil shielding layer plays a role in preliminary shielding, the aluminum foil shielding layer has a very good shielding effect on interference, and the heat generated by the first electric core and the second electric core is easily locked in the aluminum foil shielding layer.