3712 results about "Shielding effect" patented technology

This invention discloses a semiconductor power device that includes a plurality of power transistor cells surrounded by a trench opened in a semiconductor substrate. At least one active cell further includes a trenched source contact opened between the trenches wherein the trenched source contact opened through a source region into a body region for electrically connecting the source region to a source metal disposed on top of an insulation layer wherein a trench bottom surface of the trenched source contact further covered with a conductive material to function as an integrated Schottky barrier diode in said active cell. A shielding structure is disposed at the bottom and insulated from the trenched gate to provide shielding effect for both the trenched gate and the Schottky diode.

A single dielectric barrier aerodynamic plasma actuator apparatus based on the dielectric barrier discharge phenomenon is disclosed and suggested for application to aerodynamic uses for drag reduction, stall elimination and airfoil efficiency improvement. In the plasma actuator apparatus non-uniform in time and space, partially ionized gasses are generated by one or more electrode pairs each having one electrically encapsulated electrode and one air stream exposed electrode and energization by a high-voltage alternating current waveform. The influence of electrical waveform variation, electrode polarity, electrode size and electrode shape on the achieved plasma are considered along with theoretical verification of achieved results. Light output, generated thrust, ionizing current waveform and magnitude and other variables are considered. Misconceptions prevailing in the present day plasma generation art are addressed and are believed-to-be corrected. The influence of electrostatic shielding effects of the developed plasma on the applied electric field are also considered.

A thermally enhanced semiconductor package with EMI (electric and magnetic interference) shielding is provided in which a chip is mounted on and electrically connected to a surface of a substrate, and a thermally conductive member is stacked on the chip and electrically coupled to the surface of the substrate by bonding wires. An encapsulant is formed and encapsulates the chip, thermally conductive member, and bonding wires. A plurality of solder balls are implanted on an opposite surface of the substrate. The thermally conductive member is grounded via the bonding wires, substrate, and solder balls, and provides an EMI shielding effect for the chip to protect the chip against external electric and magnetic interference. The thermally conductive member has a coefficient of thermal expansion similar to that of the chip, and reduces thermal stress exerted on the chip and enhances mechanical strength of the chip to thereby prevent chip cracks.

A radio frequency (RF) device includes an RF transceiver, an RF antenna, and a magnetic signal detector. The RF is selected to be in the very high frequency (VHF), ultrahigh frequency (UHF), or super high frequency (SHF) bands such that the shielding effect is reduced and the RF device can be configured as a SIM card disposed inside a cellular phone with an increased RF communication range. The magnetic signal detector is used to sense a magnetic field signal from an RF reader, which includes an RF transceiver, an RF antenna, and a magnetic signal transmitter. The longer communication range afforded by the VHF, UHF, or SHF bands is reduced by the sensing of the magnetic field, thereby providing a communication range control, while the RF device and the RF reader exchange information through the RF channel with improved security as a result of the range control.

An IPS type liquid crystal display device capable of preventing a blanking phenomenon generated to the periphery of a screen caused by charging at the inside of a counter substrate due to the effect of a gate voltage applied to scanning line leads. In a pixel area A constituting a display region, a pixel electrode is disposed by way of an insulative film above a common electrode formed in a planar shape. In a scanning line lead area, the scanning line leads have first scanning line leads and second scanning lines formed in different layers for decreasing the width of the scanning line lead area. The scanning line leads are covered with a shield electrode formed coplanar with the common electrode. Since the shield electrode is extended as far as a portion below a sealant, the shielding effect is enhanced. Further, since the insulative film is present between the sealant and the shield electrode, the sealing effect is not deteriorated.

This invention discloses a semiconductor power device that includes a plurality of power transistor cells surrounded by a trench opened in a semiconductor substrate. At least one active cell further includes a trenched source contact opened between the trenches wherein the trenched source contact opened through a source region into a body region for electrically connecting the source region to a source metal disposed on top of an insulation layer wherein a trench bottom surface of the trenched source contact further covered with a conductive material to function as an integrated Schottky barrier diode in said active cell. A shielding structure is disposed at the bottom and insulated from the trenched gate to provide shielding effect for both the trenched gate and the Schottky diode.

A display apparatus having an LCD panel, a front cover covering a front edge of the LCD panel, a panel supporting member connected to the front cover, with the LCD panel being disposed therebetween, and a rear cover disposed in back of the panel supporting member and connected to the front cover. The display also includes a first snap pin protruding from the rear of the front cover and having a first projection holder, a reinforcing member formed with an opening and having a projection engaging with the first projection holder of the first snap pin, and a flange part formed on the panel supporting member and having a first projection engaging with the opening of the reinforcing member. With this configuration, a display apparatus can be assembled or disassembled in relatively short time, has a slim and compact appearance, and has an improved EMI shielding effect.

A control circuit and a control method for a capacitive touch panel are provided. Therein, while a scanning signal charges and discharges each trace on the capacitive touch panel, a signal in phase with the scanning signal is provided to traces adjacent to the scanned trace or a ground layer under the scanned trace so as to lower parasitic capacitances between the scanned trace and the ground layer or other traces, thereby decreasing a base capacitance of the capacitive touch panel and enhancing a sensing result of the control circuit as well as providing a shielding effect and reducing noise interference so that the capacitive touch panel has improved performance.

A metallic film and a grounding pattern are surely connected to each other so as to achieve electrical shield of an electronic circuit unit. In an electronic circuit unit, the metallic film is provided on a top surface of a sealing resin portion for burying an electronic component, the side surfaces of the sealing resin portion that are opposite to each other, and the side surfaces of the multi-layered substrate that are opposite to each other. The metallic film is connected to the grounding patterns that are provided on the top surface of the multi-layered substrate or between the laminated layers of the multi-layered substrate. Therefore, it is possible to achieve a superior electrical shielding effect through the metallic film, as compared with the related art. Since the metallic film is formed on the side surfaces of the sealing resin and the side surfaces of the multi-layered substrate, when the metallic film is formed by a plating method, the blind hole may not be provided in the related art. Therefore, it is possible to achieve the superior circulation of the plating liquid, which results in sure connection between the sure connection between the grounding pattern and the metallic film.

This invention provides the electromagnetic waves shield material that has a sufficient effect of shielding the electromagnetic waves by making the electric conductive fibers into mesh. And this invention also provides the electromagnetic waves shield mobile phone case that avoids a harmful effect on the human body without reducing the function of communication of the mobile phone used the said electromagnetic waves shield material.The fibers with electric conductivity are woven into mesh by a general knitting machine like a machine for tricot. The cost is low even used for the wide area to shield the electromagnetic waves because the consumption of the fibers needed is less. The coarseness of the net is maintained the same by controlling the movement of the length and breadth each other.To avoid the radiation to the head direction, the electromagnetic waves shield material is used for the front and upper sides of the mobile phone case which are the direction to the head when the mobile phone is in use. The regular material without electromagnetic waves shield effect is used for the both sides of the mobile phone case.The antenna cap with electromagnetic shield structure is attached to the said upper side of the electromagnetic wave shield case. The electricity with high frequency is conducted between the above antenna cap and the upper side of the electromagnetic wave shield case. The said antenna cap is a conic tube cut it's head obliquely. The opening part is made to face in the opposite side of the head when it is attached to the antenna. A metallic pin is attached to the outside of the antenna cap. This metallic pin conducts high frequent electricity with the wire antenna at the mobile phone body when it is attached. It functions as an additional antenna to the wire antenna at the mobile phone body.

An intraocular light probe has a mask or shield affixed at its distal end thereof which forms a directed light beam for intraocular illumination of target tissues or intraocular application of therapeutic light. The mask or shield serves to more fully focus, intensify and direct the beam toward the target tissues. The mask or shield also helps direct light away from other tissues and away from the eyes of the surgeon. This lessens unwanted glare. By placing a light probe beneath a surgical instrument such as a phacoemulsifier or vitrector, laser, cutting instrument (e.g., scissors or knife), forceps or probe / manipulator, whether as part of or separate from an infusion sleeve, a mask or shield effect is created. This has the same benefits of directing the beam toward target tissues, away from other tissues and away from the eyes of the surgeon. The mask or shield is opaque or semi-opaque and made of a soft, semi-rigid or rigid material. The shield can be rigid enough to serve as the shaft of an instrument with a probe or manipulator at its distal tip. It may also be reflective on the side adjacent to the fiber bundle to help direct, magnify, and intensify the beam of light. The shape of the shield can be flat, curved or circular with an opening along one side. The mask / shield can be removed from the fiberoptic light for sterilization. The device of the invention is preferably introduced into the eye via the primary or side-port incision to provide intraocular cross-lighting of tissues during surgical procedures such as cataract surgery, corneal surgery, vitrectomy, intraocular lens implantation, refractive surgery, glaucoma surgery and vitreo / retinal surgery.

The invention provides a graphene / polysiloxane composite coating material and a preparation method thereof. The method comprises the following steps: modifying the graphene surface with active groups by a chemical modification technique to obtain modified graphene, mixing the modified graphene with a silane compound, a dispersion medium, a non-essential comonomer and a non-essential accelerator, and carrying out hydrolytic condensation or hydrolytic condensation-free radical polymerization to generate a graphene / polysiloxane composite resin in situ; and mixing the resin with a non-essential blend resin, a non-essential curing agent, a non-essential solvent, a non-essential pigment and filler and a non-essential aid, and carrying out physical blending, amino epoxy addition reaction, Michael addition reaction and the like to form a film, thereby obtaining the graphene / polysiloxane composite coating material. The uniformly dispersed graphene lamellae and polysiloxane have strong interface effects, also have the gas / liquid barrier and heat shielding effects, and endow the coating with excellent corrosion resistance, flame retardancy and the like, thereby greatly enhancing the mechanical properties, corrosion resistance, scratch resistance, wear resistance and the like of the coating.

A module component with a good shield effect and a low height including a circuit board having mounted thereon a mount device including an electronic part. The device is sealed with a sealing body having a metal film formed on the sealing body surface. A ground pattern is formed at the outer periphery of the principal surface of the circuit board. The metal film is conductively connected with the ground pattern.

The invention relates to a preparation method of a silicon-carbide-fibrofelt-enhanced silica aerogel composite material, and relates to an aerogel composite material. According to the invention, a carbon-rich silicon carbide micro-nano ceramic fibrofelt with small fiber diameter, high porosity, communicating pores, fast impregnation speed, and good compatibility with a substrate is prepared with a static electro-spinning technology combined with a precursor conversion method; a silica sol is prepared with an acid-alkali two-step method; with an infiltration technology, the electro-spun silicon carbide ceramic fibrofelt or precast is soaked into the sol; and through processes such as gel process, aging, curing, solvent exchange, supercritical drying, and the like, the silicon-carbide-fibrofelt-enhanced silica aerogel composite material is obtained. The prepared composite material has the characteristics of low density, large specific surface area, super-hydrophobicity, low thermal conductivity, and the like. The strength and toughness of the material are also greatly improved. The carbon-rich silicon carbide fiber has an infrared shielding effect, such that composite material thermal insulation effect and ultra-high-temperature stability can be improved.

The invention relates to a composite fiber. The composite fiber comprises a fiber carrier, and a graphene aerogel layer covering the outer side of the fiber carrier. According to the composite fiber provided by the invention, the relatively thin graphene aerogel layer covers the surface of the composite fiber, and a self surface shielding effect of existing graphene aerogel is overcome; the adsorption speed and adsorption efficiency of the graphene aerogel of the unit volume are improved; the fiber carrier of the composite fiber provided by the invention provides a bracket for the graphene aerogel and the mechanical strength is enhanced; when the composite fiber is used as an adsorption material, the composite fiber can be in seamless butt joint with an existing cigarette production process directly, and replaces an existing adsorption fiber so that the specific adsorption on benzopyrene polycyclic aromatic hydrocarbon type harmful substances can be realized; and meanwhile, other aromatic substances in smoke are kept so that the flavor and aroma of cigarettes are not influenced.

The invention relates to radiation shield concrete and a preparation method thereof. The radiation shield concrete is characterized by comprising a cementing material, coarse aggregates, fine aggregates, steel fibre, a high-efficiency slushing agent and water; the cementing material is composed of ordinary portland cement and inorganic mineral admixtures; the inorganic mineral admixtures are siliceous dust and coal ash; the fine aggregates are natural sand, boron glass powder and steel slag powder; the coarse aggregates are steel sections or a mixture of the steel sections and steel slag; the proportions of various types of components are as follows: 500 kg / m<3> of cementing material, 1400-2215 kg / m<3> of coarse aggregates, 750-950 kg / m<3> of fine aggregates, and 155-200 kg / m<3> of water; the high-efficiency slushing agent is 0.5-1.0% of the total weight of the cementing material by weight; and the steel fibre is 1.0-1.5% of the total volume of the concrete by volume. The radiation shield concrete has good mechanical property and lasting quality, good shielding effect on gamma rays, good effect on shielding neutron rays, can be used or comprehensively recycling wastes and has low cost.

The invention discloses a graphene / nano ferrite based water electromagnetic shielding paint and a preparation method thereof. Ferrite nanoparticles are loaded on the surface of graphene to prepare a graphene / ferrite nanocomposite with the electrical conductivity of the graphene and the good magnetic property of the nano ferrite, and then the nanocomposite is combined with a water film-forming resin and other auxiliaries to prepare the green and environment-friendly water electromagnetic shielding paint. The preparation method has the characteristics of being simple to operate, high in practicability, free of hazardous substance, capable of making electromagnetic shielding paints suitable for different frequencies and occasions, good in shielding effect, and the like; the prepared graphene / nano ferrite based water electromagnetic shielding paint has excellent electromagnetic shielding performance, and therefore has good application prospect in the field of electromagnetic shielding paints.

The invention discloses a glass for prevention of information leakage which comprises glass, metal mesh and polycarbonate film, wherein two layers of polycarbonate films are arranged on each side of the metal mesh, a layer of glass is adhered on the outboard of the polycarbonate film by thermal compression bonding to form a unitary. The invention can effectively prevent information leakage, and diminishes the possible injury by the electromagnetic wave to the human body. íí

A reflection type display apparatus has a front light unit (FLU), and includes a display panel, a light guide disposed on the upper surface of the display panel, a light transparent adhesive layer attaching the lower surface of the light guide to the upper surface of the display panel, and a light source located at a side of the light guide for emitting light to the light guide. A protection window covers the light guide and the light source. By covering the display panel installed on the lower surface of the protection window and the light guide with a moisture-proof and light-shield film, moisture-proofing and light-shielding effects are obtained simultaneously. Further, by forming a light absorption layer at the edge of the light guide adjacent to the light source, generation of a hot spot at the edge of the light guide may be inhibited.

The invention relates to a transparent heat insulation coating material, the preparation method and the application thereof. The material is made from the raw material of lanthanum hexaboride / tin indium oxide or lanthanum hexaboride / tin antimony oxide, by the steps of pretreating by ultrasonic dispersion, and grinding to prepare nanometer slurry with heat insulation function, wherein the nanometer slurry has particle sizes mainly between 10nm and 200nm, the average particle size between 50nm and 120nm, and superior dispersion stability; mixing the nanometer slurry with film forming substance, auxiliary agent and solvent, to obtain the transparent heat insulation coating material. The coating material can obstruct more than 80% of infrared light, has a visible light transmittance above 60%, achieves excellent transparency and sunshine energy shielding effect; can be directly coated on transparent glass, polycarbonate, synthetic glass and polyester; and achieves the aims of energy conservation and heat insulation.

The invention relates to a fabric capable of preventing electromagnetic radiation, which is knitted or weaved. The warp and the abb of the fabric comprise covering yarn. The covering yarn takes one of silver plating fiber, carbon fiber and carbon black organic fiber as core yarn and takes comfortable fiber as skin yarn; the silver plating fiber is formed by carrying out silver plating on synthetic fiber; the weight ratio of the corn yarn to the skin yarn is 10-70:30-90; and the comfortable fiber is one of cotton, wool, silk, hemp, viscose, bamboo fiber, bamboo carbon fiber, soybean fiber, PLA fiber, alginate fibre, milk fiber and pearl fiber. The invention can shield electromagnetic wave, and the shield effect is above 99%. The skin yarn in the covering yarn adopts natural fiber, and the natural fiber on the outer layer has the characteristics of moisture absorption, ventilation and comfort.

The invention relates to a control method of self-adapted code rate based on time-space masking effect. The method unifies a macroscopic description that reflects features in some part of a visual sensing system, especially merging the perceiving property of eye about motion information with other sensing features, which includes: preprocessing the original sequence of video code; then calculating frame level complexity and degrees of perception of each macro-block using time-space masking effect; the self-adapted code rate control algorithm distributes frame bit number according to frame complexity; finally determining the quantization parameter of macro-block according to the degree of perception of the macro-block. The method obtains a better object visual quality under the condition of identical or less bit number in comparison with the code rate control algorithm on the JM10.2 edition of H.264 check model.

A low-cost, current sensor suitable for mass production and a manufacturing method thereof are provided. The current sensor is small with high sensitivity and can be packaged in a standard assembly line which is normally used when an integrated circuit is manufactured. Further, it is possible to obtain a sufficient shielding effect against a disturbance flux without degrading the detecting sensitivity of a flux. A first magnetic material 50 is bonded to the lower part of a current conductor 22C. The first magnetic material 50 has the function of converging and amplifying a flux 3 generated by the current to be measured. A second magnetic material 51 is bonded above a magnetic sensor chip 20. The second magnetic material 51 has a shielding function against a disturbance flux entering from the outside.

The invention discloses a micro-foam drilling fluid. The micro-foam drilling fluid comprises the following compositions: 40 to 50 grams of bentonite, 3 to 5 grams of composite foaming agent, 2 grams of xanthan, 3 grams of high-viscosity carboxymethyl cellulose, 3 grams of sodium carbonate, 2 to 3 grams of strong zwitterionic coating agent, 5 grams of partially-hydrolyzed polyacrylonitrile ammonium salt, 5 grams of organic silicon humic acid kalium, 5 grams of lignite resin and 1 grams of viscosity reducer for the drilling fluid in each liter of the drilling fluid, wherein the composite foaming agent consists of lauryl sodium sulfate and sodium dodecyl benzene sulfonate according to mass ratio of 7:3. The drilling fluid has low density, good shielding effect and remarkable anti-leaking effect of a low-pressure easy-to-leak layer and can effectively improve the quality of well cementation.

An electrical connector for electrically connecting a chip module with a printed circuit board includes an insulative housing and a number of contacts fixed in the insulative housing. The insulative housing includes an upper component and a lower component cooperated with the upper component. The upper component has a protruding portion and the lower component has a hole cooperated with the protruding portion. The protruding portion is in touch with the hole and the contacting area is plated with a metal fillings. It is easy to assemble and it has better shielding effects.