1277results about How to "Improve electromagnetic shielding performance" patented technology

A technology is provided which allows a reduction in the size of a semiconductor device without degrading an electromagnetic shielding effect and reliability against reflow heating. After a plurality of components are mounted over a component mounting surface of a module substrate, a resin is formed so as to cover the mounted components. Further, over surfaces (upper and side surfaces) of the resin, a shield layer including a laminated film of a Cu plating film and an Ni plating film is formed. In the shield layer, a plurality of microchannel cracks are formed randomly along grain boundaries and in a net-like configuration without being coupled to each other in a straight line, and form a plurality of paths extending from the resin to a surface of the shield layer by the microchannel cracks.

The invention provides a technology for manufacturing a higher performance and higher reliability semiconductor device at low cost and with high yield. The semiconductor device of the invention has a first conductive layer over a first insulating layer; a second insulating layer over the first conductive layer, which includes an opening extending to the first conductive layer; and a signal wiring layer for electrically connecting an integrated circuit portion to an antenna and a second conductive layer adjacent to the signal wiring layer, which are formed over the second insulating layer. The second conductive layer is in contact with the first conductive layer through the opening, and the first conductive layer overlaps the signal wiring layer with the second insulating layer interposed therebetween.

The invention discloses a Cu-Fe alloy wire and a preparing method thereof, and belongs to the technical field of non-ferrous alloy. The preparing method includes the steps that an intermediate alloy with even ingredients is used as parent materials, wherein the ingredients of the parent materials comprise 45% to 60% of Fe, 0.20% to 0.35% of Ni, not smaller than 0% of RE and the balance Cu; and then cathode copper and the intermediate alloy parent materials serve as raw materials, and a casting-state alloy ingot is obtained through vacuum melting and further machined into the Cu-Fe alloy wire, wherein the wire is prepared from 8.0% to 13.0% of Fe and the balance Cu and unavoidable impurities. When the prepared Cu-Fe alloy is in the casting state and the forging state, Fe-Cu solid solution is good, Fe elements are evenly distributed without segregation, and good machinability is achieved. The diameter phi of the further-machined finished wire ranges from 0.05 mm to 0.1 mm, the tensile strength of the finished wire is larger than or equal to 440 N/mm<2>, and the elongation of the finished wire is larger than or equal to 10%. The Cu-Fe alloy further has the excellent electromagnetic shielding effect.

The invention relates to a composite electromagnetic shield material with a laminated structure. The laminated structure comprises a magnetic material coating, a metal coating, an adhesive glue coating and a plastic protective coating, wherein one side of the metal coating is jointed with the magnetic material coating, the other side of the metal coating is jointed with one side of the adhesive glue coating, and the other side of the adhesive glue coating is jointed with the plastic protective coating. The invention has the advantages that: firstly, the theory of electromagnetic shield shows that the composition of the metal coating and the magnetic material coating can well shield high-frequency and low-frequency interference; secondly, the technology is simple, the cost is low, and the technical requirements of most electromagnetism compatibility engineering can be satisfied through adjusting the thickness of the metal coating, the thickness and magnetic permeability of soft magnetic material and other parameters; and thirdly, the shield material is easy to adhere outside or inside plastic casings of electrical appliances according to requirements of use after tearing off the plastic protective coating on the adhesive glue coating.

The invention discloses an indoor track type intelligent patrolling robot system based on a combined track. The system comprises the combined track and a robot body. The robot body comprises a drive system, a detecting assembly, a holder, a synchronous belt system, a movable platform and a control system, wherein the control system is arranged on the movable platform, the holder is fixed to the upper end of the movable platform, the detecting assembly is fixed to the holder, the synchronous belt system is fixedly connected with the combined track, the driving system is fixed to the movable platform, the movable platform is placed on the combined track, and the drive system provides power to enable a robot to move along the combined track. The wall-mounted combined track is adopted, the robot can move in two or more vertical planes, the combined mode meets the diverse and complex detecting requirements of indoor equipment detection, and according to the actual detecting requirement, a horizontal track or a vertical track can be independently taken out to independently form a system detection robot system.

The invention discloses a flexible high-strength MXene-based electromagnetic shielding composite film, which comprises a conductive layer Ti3C2Tx MXene/silver nanowire and a polymer enhancement layeraramid nanofiber, and is characterized in that the mass fraction of the Ti3C2Tx MXene/silver nanowire conductive layer is 10-80%; the mass ratio of the Ti3C2Tx MXene to silver nanowire is (10: 0.5)-(10: 1.5). The invention further discloses a preparation method of the flexible high-strength MXene-based electromagnetic shielding composite film. The composite film prepared by the invention has excellent flexibility and mechanical properties, good conductivity and broadband high electromagnetic shielding effectiveness, and can meet the application in the fields of aerospace, military engineering,artificial intelligence and flexible wearable electronic equipment.

The invention discloses a graphene film for light efficient electromagnetic shielding and a preparation method thereof. An oversized graphene oxide sheet is used for forming the film and by virtue of an annealing mode under high temperature, the graphene defect is perfectly repaired, the edge defect is reduced to the lowest to form a perfect large conjugate structure, and the smoothness of a head conducting path of the graphene is guaranteed; furthermore, through three steps of independent warming processes, a functional group is separated from the surface of the graphene step by step, a pore-foaming agent included between the graphene sheets is slowly decomposed, and the functional group and the pore-forming agent are released step by step in a gas mode; and meanwhile, the graphitization process is gradually developed to form a graphene micro airbag; in the forming process of the micro gasbag, the most stable functional group on the surface of the graphene falls off, thereby producing the graphene structure formed by 1-4 layers of graphene sheets with the gas expansion under high temperature; the successful introduction of the graphene few-layer structure greatly promotes the conductivity performance of the material. The micro gasbag structure is assisted by good conductivity performance so that the graphene of the invention has strong electromagnetic shielding performance.

The invention relates to a preparation method of a lightweight graphite-based nano-magnetic metal composite material used for electromagnetic shielding, which belongs to the related field of electromagnetic shielding materials; the precursor solution of expanded graphite and magnetic metal is mixed and stirred evenly, and dried after evaporating the solvent. The obtained mixture is treated in a reducing atmosphere at 300°C-1000°C, passivated with ordinary nitrogen and cooled to room temperature to obtain a composite material of expanded graphite and magnetic nanometer metal, and the relative content of the two can be adjusted. The composite material is light in texture, has excellent electromagnetic properties, and can be pressed into various shapes required. The material has excellent electromagnetic shielding performance in the range of 300kHz-1.5GHz, reaching 70-105dB, and the addition of magnetic metal improves the electromagnetic shielding performance of the expanded graphite in the low-frequency band. The method is simple and efficient, suitable for mass preparation, and the obtained product is expected to be applied in aerospace, military, electronic and electrical products.

The invention provides a magnesium alloy chemical conversion film forming solution, wherein the film forming solution is a water solution containing ceric sulfate, sulphuric acid, phytic acid, an inhibiter and a buffering agent and has a pH value between 2 and 6. The invention further provides a method for preparing the magnesium alloy chemical conversion film. The chemical conversion film obtained by the film forming solution and the method for preparing the magnesium alloy chemical conversion film has high adhesive attraction of the paint film, good corrosion resistance and wearing resistance, good compactability of the film and low electric resistance.

The invention discloses a high toughness cement-based material-nonmetal fiber rib composite structure. According to the structure, a high toughness cement-based material is adopted as a base material, nonmetal fiber rib is adopted as directional reinforcing rib; the high toughness cement-based material comprises the following components in percentage by weight: 35% of cement, 45-55% of fly ash, 5-10 % of silicon ash and 5-10% of metakaolin; high-strength short fiber is one or more out of polyvinyl alcohol fiber, polyethylene fiber, carbon fiber and aramid fiber; the nonmetal fiber rib is carbon fiber reinforced plastic rib, aramid fiber reinforced plastic rib, glass fiber reinforced plastic rib or basalt fiber reinforced plastic rib. The invention further discloses applications and an application method of the high toughness cement-based material-nonmetal fiber rib composite structure. The high toughness cement-based material and the nonmetal fiber rib are utilized to reinforce the reinforced concrete structure, so that the bearing capacity and the durability of the structure are increased and the aging speed of the structure is reduced.

The invention relates to a waterborne polyurethane-MXene electromagnetic shielding bionic nanocomposite film and a preparation method. Through pre prepolymeriztion reaction of polytetrahydrofuran gl and diisocyanate and chain extension by a hydrophilic chain extender, then a neutralizing agent is added, subsequently, deionized water is added for emulsification dispersion to obtain a waterborne polyurethane emulsion; waterborne polyurethane and MXene are prepared into water dispersion liquid, MXene is added to the waterborne polyurethane under stirring, continuous stirring is carried out to enable waterborne polyurethane macromolecules to be fully and uniformly adsorbed on MXene nanosheets. And waterborne polyurethane-MXene composite dispersion liquid is obtained; and a series of nanocomposite films are prepared by a vacuum filtration method, a solvent evaporation method or a coating method. The prepared nanocomposite thin films have ordered "brick-wall" structures in a bionic shell layer shape on the micro and nano scales, the mechanical properties are excellent, the flexibility is good, the electromagnetic shielding effectiveness is excellent, preparation methods are diverse, thethickness is controllable, and application is wide.

The invention discloses a novel polymer-based electromagnetic shielding film or sheet and a preparation method thereof. The electromagnetic shielding material is formed by arranging insulating layers and conductive layers in an alternate lamination mode, wherein the insulating layers are made of polymer resin; the conductive layers are made of two-dimensional conductive substance filled polymer resin; and the insulating layers and the conductive layers have a high electrical resistance rate. A large number of laminated interfaces exist in the material, are oriented by two-dimensional platy conductive substances and are parallelly arranged. The preparation method comprises the following steps of: putting materials of the insulating layers and the conductive layers into two extruding machines of a micro-laminated co-extrusion device respectively for fusion plasticization; superposing two melts to form two layers of melts at a convergence device; and cutting and superposing by using n layer multipliers to obtain 2(n+1) layers of electromagnetic shielding materials. According to the film or sheet and the preparation method, the layer number of the electromagnetic shielding materials and the ratio of the thickness of each conductive layer to the thickness of each insulating layer are determined by the number of the layer multipliers and the rotation speed ratio of the extruding machines respectively; the film or the sheet has designable structures and properties; and compared with an electromagnetic shielding material prepared by the conventional method, the electromagnetic shield material has a high electromagnetic shielding effect and a high breaking elongation rate. The equipment provided by the invention is simple and readily-available, required materials are commercially available, other chemicals are not required to be synthesized, and the equipment is easy to operate and has low production cost and high efficiency.

The disclosure provides an electromagnetic shielding composite material, and a method for manufacturing the same. The electromagnetic shielding composite material includes: a polymer sheet; and an acicular carbon nanotube layer including acicular portions of carbon nanotubes fixed on the polymer sheet. The method for manufacturing the electromagnetic shielding composite material includes: preparing a carbon nanotube dispersion solution; applying the carbon nanotube dispersion solution to the surface of a polymer sheet; and drying the polymer sheet to which the carbon nanotube dispersion solution is applied and then forming an acicular structure of carbon nanotubes on the polymer sheet. The composite material has superb electromagnetic wave shielding properties suitable for a variety of electronics applications.

An improved signal transmission line whose degree of freedom in designing its signal line pattern and line width and in adjusting its characteristic impedance is significantly increased. The transmission line. The signal transmission line includes an insulating substrate whose one surface has at least one signal line longitudinally extending from one to the other end of the insulating substrate; and two net-like conductive layers laid on the opposite surfaces of the insulating substrate, the spaces for each of the net-like conductive layers being formed at random.

The invention discloses an indoor intelligent patrol robot system based on an H-shaped combined rail. The system comprises a combined rail and a robot body; the robot body comprises a driving system, a detecting module, a holder, a synchronous belt system, a mobile platform and a control system, wherein the holder is fixed at the upper end of the mobile platform; the detecting module is fixed on the holder; the synchronous belt system is fixedly connected with the combined rail; the driving system is fixed on the mobile platform; the mobile platform is placed on the combined rail; and the driving system provides power to enable a robot to move along the combined rail. The combined rail is a wall-mounted combined rail, so that the position transfer in two or more vertical planes can be realized; the combined mode satisfies various and complex detecting requirements in the detection of indoor equipment; and a horizontal rail or a vertical rail can be singly taken out to independently build a system for detecting the robot system according to actual detecting demands.

The invention discloses a polymer-based electromagnetic shielding material based on carbon fiber and graphene and a preparation method of the polymer-based electromagnetic shielding material. The polymer-based electromagnetic shielding material is prepared by use of the following steps: firstly, acidizing the carbon fiber and performing ultrasonic dispersion on the acidized carbon fiber and the graphene in a solution containing a coupling agent to prepare an interpenetrating network structure; secondly, adding the solution of a polymer by use of a solvent mixing method and stirring and drying to obtain mixture powder; and finally, evenly mixing the mixture powder with an antioxidant, a compatilizer or other auxiliaries and then extruding and granulating by use of a twin-screw extruder. According to the polymer-based electromagnetic shielding material based on the carbon fiber and the graphene, an intertwined network structure of the carbon fiber and the graphene are kept inside the polymer so that an efficient power transmission and network can be formed in the matrix; the prepared electromagnetic shielding material has a good electromagnetic shielding effect, and also has the characteristic of good comprehensive mechanical properties and thermal conductivity. The polymer-based electromagnetic shielding material has the advantage of expanding the application of the carbon fiber and the graphene in the field of the electromagnetic shielding materials.

The invention provides a pluggable optical transceiver module, which comprises a base and an upper cover, wherein a light emitting assembly and a light receiving assembly are arranged in the base; an electromagnetic shielding gasket is also arranged on the periphery between the faying surfaces of the base and the upper cover; the surrounding edge of the gasket is provided with a plurality of elastic tooth sheets; one part of contacts of the elastic tooth sheets is formed into electric conduction connection after making contact with the surrounding edge of the upper cover; the other part of contacts is also formed into conduction connection after making contact with the surrounding edge of the base. Therefore, the contact points of the base and the upper cover are increased, a plurality of electric conduction connection points are formed, and therefore, the electromagnetic shielding effect is improved.

The invention discloses an indoor rail-type intelligent patrolling robot. The indoor rail-type intelligent patrolling robot comprises a robot terminal system. The robot terminal system comprises a sectional material rail. The sectional material rail is installed on the indoor wall, and a movement mechanism, a movement driving mechanism and a detecting mechanism are installed on the sectional material rail. The detecting mechanism comprises a holder and a detecting assembly and is installed on the movement mechanism. The movement mechanism is driven by the movement driving mechanism and drives the detecting mechanism to vertically move along the sectional material rail, wide-range detection on an indoor to-be-detected device is achieved in cooperation with running of the holder, and the robot terminal system carries out power supply and communication in a cable pulling mode or carries out power supply in a wire sliding contact mode and carries out communication in a power line carrier mode. The indoor rail-type intelligent patrolling robot is compact and attractive in structure, rapid and convenient to install, stable and reliable in running, high in positioning accuracy, wide in detection range and high in automation degree.

An exemplary joining structure, used for insert-molded covers, includes a metallic portion (131), a plastic portion (132) integrally formed with the metallic portion, and an adhesive film (133) formed between the metallic portion and the plastic portion. The metallic portion and the plastic portion are bonded together by the adhesive film. The present invention also relates an insert-molded cover (10) for electronic devices using the joining structure and a method for manufacturing the insert-molded cover for electronic devices.

The invention discloses a preparation method for a graphene and metal composite electromagnetic shielding film. The method comprises the steps of extruding graphene or graphene oxide dispersion liquid from a horizontal type die orifice preparation device by a solution wet spinning method, and performing solidification drying reduction to obtain a graphene film; then depositing metal on the surface of the graphene film through physical vapor deposition or chemical electroplating to obtain the electromagnetic shielding film in which the graphene film is used as a substrate and a single surface or two surfaces is or are covered by a metal layer or two metal layers. The graphene film prepared by the preparation method is adjustable in thickness and size; a micro structure is regular; the grahene film is extremely high in conductivity and wide in absorption frequency band, and has a wide application prospect in the field of electromagnetic shielding and wave absorption.

The invention discloses a silicon electret condenser microphone and a method for making the same. The silicon electret condenser microphone comprises a shell, an acoustic transducer chip, an IC device, other passive components and a substrate, wherein the shell and the substrate are fixed together and form a cavity, and the shell and/or the substrate is provided with sound inlets; the acoustic transducer chip, the IC device and other passive components are positioned in the cavity and are respectively fixed and electrically connected with the substrate; the substrate is provided with an output end bond pad; an acoustic cavity is formed between the acoustic transducer chip and the substrate, and the substrate has a first mounting surface and a second mounting surface, with the acoustic transducer chip and the IC device fixed on the first mounting surface, and the other passive components fixed on the second mounting surface. The silicon electret condenser microphone in the technical proposal of the invention has two mounting surfaces for mounting elements, with the other passive components arranged on the second mounting surface and, the acoustic transducer chip and the IC device arranged on the first mounting surface, thereby realizing full page printing and improving the production efficiency.

An electromagnetic shielding film comprises a release film layer, an insulating layer, a black insulating shielding layer, a metal layer, a conductive adhesive layer and a protective film layer whichare connected in order, the conductive adhesive layer comprises an electromagnetic wave absorbent, and the electromagnetic wave absorbent is a mixture of one or more than one selected from a carbon nanotube , Graphene and ferrite. The preparation method of the electromagnetic shielding film comprises the following steps: preparing a release agent, and obtaining a release film layer through a coating process; preparing the insulating layer and the black insulating shielding layer according to a formula, coating the insulation layer on the release film layer according to the coating process, coating the black insulating shielding layer on the other surface of the insulating layer, and plating metal at the other surface of the black insulating shielding layer through the coating process to form a metal layer and obtain a semi-finished product; preparing a conducting adhesive, and coating the conducting adhesive on the metal layer; and preparing a protective film on the other surface of the conductive adhesive through the coating process to obtain the semi-finished product.