420 results about "Magnetic field shielding" patented technology

Provided are a magnetic field shield sheet for a wireless charger, which blocks an effect of an alternating-current magnetic field generated when a charger function for a portable mobile terminal device is implemented in a non-contact wireless manner on a main body of the portable mobile terminal device and exhibits excellent electric power transmission efficiency, a method of manufacturing the sheet, and a receiver for the wireless charger by using the sheet. The sheet includes: at least one layer thin magnetic sheet made of an amorphous ribbon separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape, wherein gaps among the plurality of fine pieces are filled by some parts of the first and second adhesive layers, to thereby isolate the plurality of fine pieces.

A magnetic field sensor comprises a magnetic field sensing cell (10) and a magnetic shield (9) comprising at least two parts (12a, 12b) separated by an air-gap (20) and surrounding the magnetic field sensing cell positioned in a cavity (11) of the magnetic shield.

The present invention relates to: a magnetic field shielding sheet for a digitizer which minimizes an influence on a geomagnetic sensor, shields the electromagnetic field generated from various constituent elements of a main body of a portable terminal device when preparing a digitizer function for the portable terminal device, and can simultaneously improve the sensitivity of an electronic pen; a manufacturing method thereof; and the portable terminal device using the same. The magnetic field shielding sheet of the present invention comprises: a thin magnetic sheet having at least one layer which is formed with a nano-crystalline alloy and is divided into a plurality of fine pieces by flake treatment; a protective film attached to one side of the thin magnetic sheet through a first adhesive layer; and double-sided tape attached to the other side of the thin magnetic sheet through a second adhesive layer formed on one side, wherein the thin magnetic sheet is characterized by heat-treating an amorphous ribbon formed with the nano-crystalline alloy at a temperature of 300 DEG C to 700 DEG C.

The invention relates to magnetic field shielding textile fabrics, a preparation method and application of the magnetic field shielding textile fabrics. The invention discloses the magnetic field shielding textile fabrics, which are formed by interlacing of permalloy wires and wearing yarns. The magnetic field shielding textile fabrics which are prepared by the permalloy wires can effectively attenuate a stationary magnetic field and a low-frequency magnetic field with DC - 300 Hz, are soft, can be cut, and can be applied to individual protection and magnetic field source shielding.

A positron emission tomography (PET) detector ring comprising: a radiation detector ring comprising scintillators (74) viewed by photomultiplier tubes (72); and a magnetic field shielding enclosure (83, 84) surrounding sides and a back side of the annular radiation detector ring so as to shield the photomultiplier tubes of the radiation detector ring. Secondary magnetic field shielding (76′) may also be provided, comprising a ferromagnetic material having higher magnetic permeability and lower magnetic saturation characteristics as compared with the magnetic field shielding enclosure, the second magnetic field shielding also arranged to shield the photomultiplier tubes of the radiation detector ring. The secondary magnetic field shielding may comprise a mu-metal. The PET detector ring may be part of a hybrid imaging system also including a magnetic resonance (MR) scanner, the PET detector ring being arranged respective to the MR scanner such that a stray magnetic field from the MR scanner impinges on the PET detector ring.

A magnetic field measuring apparatus has a magnetic field shielding apparatus including non-magnetic cylindrical members on which high-permeability sheets are located in a state of being partially overlapped with each other. The cylindrical members are located to surround an axis of a first direction concentrically and having a hollow portion, the cylindrical member located on an innermost-side having a first opening at one end of the first direction, a second opening at the other end of the first direction, and a third opening penetrating the cylindrical members in a direction perpendicular to the axis of the first direction. In addition, the magnetic field measuring apparatus has a living-body holder located in an inner-side space of the cylindrical member and a cryostat inserted into the third opening and maintaining SQUID magnetic-flux meters.

Provided is a magnetic field shield sheet for a digitizer, which blocks an effect of a magnetic field generated from various components of a main body of the portable terminal device and at the same time improves the sensitivity of an electronic pen when a digitizer feature is implemented in the portable terminal device, while minimizing an influence upon a geomagnetic sensor. The magnetic field shield sheet includes: at least one layer thin magnetic sheet made of a nanocrystalline alloy and flake-treated so as to be separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape.

An improved electromagnetic field shielding for electronic equipment is disclosed. The improved shielding is composed of meta-material, where the meta-material provides electromagnetic wave protection. The meta-material can be coupled to existing enclosures for electronic equipment. The meta-material provides a wideband negative permittivity or a wideband negative permeability, where a direction of propagation of incoming electromagnetic energy is reversed before the energy can induce currents on a surface of the enclosure. Enclosures with poor shielding protection can be used in conjunction with the improved shielding. The improved shielding thus provides protection against external electromagnetic fields without the need for apertures or tightly sealed seams.

Disclosed is a method of manufacturing a magnetic field shielding sheet. The method of manufacturing a magnetic field shielding sheet formed as a plurality of divided pieces includes preparing a magnetic sheet formed of a magnetic material and having a first area and punching the magnetic sheet to form a shielding sheet using a mold such that the shielding sheet having a second area which is narrower than the first area is separated from the magnetic sheet, wherein the punching of the magnetic sheet to form the shielding sheet includes forming at least one linear slit in an inner region of the second area using the mold such that the shielding sheet is divided into a plurality of pieces while the shielding sheet is separated from the magnetic sheet to have the second area.

A positron emission tomography (PET) detector ring comprising: a radiation detector ring comprising scintillators (74) viewed by photomultiplier tubes (72); and a magnetic field shielding enclosure (83, 84) surrounding sides and a back side of the annular radiation detector ring so as to shield the photomultiplier tubes of the radiation detector ring. Secondary magnetic field shielding (76′) may also be provided, comprising a ferromagnetic material having higher magnetic permeability and lower magnetic saturation characteristics as compared with the magnetic field shielding enclosure, the second magnetic field shielding also arranged to shield the photomultiplier tubes of the radiation detector ring. The secondary magnetic field shielding may comprise a mu-metal. The PET detector ring may be part of a hybrid imaging system also including a magnetic resonance (MR) scanner, the PET detector ring being arranged respective to the MR scanner such that a stray magnetic field from the MR scanner impinges on the PET detector ring.

The present invention provides apparatus and methods for acquiring ultrasound measurements representing biosignals from a subject located in the strong magnetic field of a spatial imaging device. The invention includes ultrasound probes having minimal magnetic parts and an ultrasound signal pre-amplifier being shielded by a barrier or barriers from the strong magnetic field of a spatial imaging device such as an MRI, PET, or CT scanner. Most preferably, the ultrasound probe produces ultrasound waves in the frequency range of approximately 2.0 MHz to 2.5 MHz. The ultrasound probe may include no electronic components and contains minimal magnetic or ferromagnetic parts. The elements for acquiring and analysing ultrasound waves may be located in separate rooms from the imaging device. The invention provides a method of taking ultrasound measurements in quick succession with measurements of a spatial imaging device to provide a more informative understanding of the physiology of the subject.

A wireless power transmission module is provided. According to an exemplary embodiment of the present disclosure, a wireless power transmission module includes an antenna unit, a magnetic field shielding sheet, and a planar heat radiating plate. The antenna unit includes at least one wireless power transfer antenna. The magnetic field shielding sheet shields a magnetic field generated by the antenna unit to suppress external leakage of the magnetic field and concentrate the magnetic field in a desired direction. The planar heat radiating plate which is disposed on one surface of the magnetic field shielding sheet to release heat generated by the antenna unit. The wireless power transmission module is equipped or embedded in a vehicle to be used to charge a main battery of a portable terminal.

The electric highway includes at least one electrified lane that may be separated from other non-electrified lanes by a non-elevated strip of dividers, a roadside subsystem that includes a system operation monitoring center that monitors system operation; a plurality of roadside conductor assemblies, each of which includes at least one roadside conductor laid within a coaxial pipe made of a non-magnet field shielding material, and its / their housing in the traffic lane; a roadside part of an on-board part of a lateral location sensor; a plurality of roadside controller each of which includes a power supply assembly, at least one communication device housed in a roadside box, and a plurality of roadside posts with a camera affixed to it. The electric highway system is monitored continuously at the system operation monitoring center.

The invention provides a shielding effectiveness testing system for a near-zone low-frequency strong magnetic field, which comprises the following components: 1) a low-frequency high-current source and a transmitting ring antenna for generating and transmitting magnetic field signals; and 2) a receiving ring antenna for receiving and processing the magnetic field signals, a receiver and a computer with Matlab software and visual software. The system has the following technical effects: 1) the system can simulate main characteristics of low-frequency low-impedance strong magnetic fields in a frequency range of (30-1k) Hz; 2) the system has strong anti-jamming capability, large measuring dynamic range, small volume and convenient carry, and can enter the interior of a project to directly measure a shielding chamber; 3) the system provided with the visual software with simple operation and flexible use can realize integration of data acquisition and data processing of magnetic field receiving equipment; and 4) the system has good instantaneity during testing, and can be used for detection of material shielding performance in the project and quality inspection and acceptance of an electromagnetic shielding chamber.

The invention discloses a 728nm frequency stabilized laser standard generation device which comprises a 455nm wavelength pump laser, a 728nm wavelength semiconductor laser, a glass air chamber, a magnetic field shielding box, a temperature control circuit and a screen lock circuit. The glass air chamber is provided with alkali metal cesium atoms, the magnetic field shielding box is used for isolating an earth magnetic field of the glass air chamber with the alkali metal cesium atoms, the temperature control circuit is used for controlling and stabilizing the temperature of the glass air chamber with the alkali metal cesium atoms, and the screen lock circuit is used for locking the frequency of the 728nm wavelength semiconductor laser on a 728nm laser spectrum line between the 5D excited state and the 6F excited state of the cesium atoms. The 728nm frequency stabilized laser standard generation device has the advantage that the device is clear in principle, simple in structure, easy to implement and stable in performance and has important application significance in the field of different subjects such as wavelength calibration of a laser wavelength meter, coherent optical communication, radar signal synchronization, optical frequency atom clocks and the like under special conditions.

The invention provides a magnetic field shielding system based on a closed superconducting coil group. The system comprises a first level superconducting coil and a second level superconducting coil. The first level superconducting coil and the second level superconducting coil are coaxially arranged around the same center symmetry axis in the same plane. The first level superconducting coil and the second level superconducting coil are connected in series to form a closed loop. A uniform field is formed in the second level superconducting coil to shield an external magnetic field. The invention further provides a magnetic field shielding device. According to the magnetic field shielding system, the technological realization line is simple, and the engineering practice is facilitated.

Disclosed is a magnetic field shielding unit. The magnetic field shielding sheet includes a magnetic field shielding sheet and a metallic protecting member attached to a surface of the magnetic field shielding sheet via an adhesive layer for protecting the magnetic field shielding sheet as well as to for radiating heat generated from a heat source.

A magnetic field shielding sheet includes: at least one layer thin magnetic sheet made of a Fe-based amorphous alloy and flake-treated so as to be separated into a plurality of fine pieces; a protective film that is adhered on one surface of the thin magnetic sheet via a first adhesive layer provided on one side of the protective film; and a double-sided tape that is adhered on the other surface of the thin magnetic sheet via a second adhesive layer provided on one side of the double-sided adhesive tape, wherein the thin magnetic sheet is obtained by heat treating an amorphous ribbon sheet made of the Fe-based amorphous alloy at a temperature of 300° C. to 480° C. A method of manufacturing the magnetic field shielding sheet, and a portable terminal device using the magnetic field shielding sheet are disclosed.

Provided is an X-ray analyzer capable of significantly suppressing an influence of an external magnetic field on a transition edge sensor (TES). The X-ray analyzer includes: a TES (7) for detecting energy of a received X-ray as a temperature change and outputting the temperature change as a current signal; a superconducting magnetic shield (8) which contains the TES (7) and enters a superconducting state; and a room temperature magnetic shield (9) which covers the superconducting magnetic shield (8) and performs external magnetic field shielding until the superconducting magnetic shield (8) enters the superconducting state, in which the superconducting magnetic shield (8) and the room temperature magnetic shield (9) are concentrically arranged to have a cylindrical shape.

The invention provides a 3D integrated framework of an ultrahigh frequency power converter. The 3D integrated framework comprises a PCB circuit layer and a winding unit erected on the PCB circuit layer. The winding unit is connected with the PCB circuit layer through a wire. The winding unit comprises winding layers formed on a first insulating layer and a first soft magnetic thin film layer formed on a second insulating layer. The first soft magnetic thin film layer is arranged below the winding layers in a laminated mode to be used for achieving magnetic shielding between the winding layers and the PCB circuit layer. Compared with the prior art, by the adoption of 3D integration, the size of the converter is reduced, and the power density is increased; soft magnetic materials are adopted to form the magnetic shielding layer, magnetic field interference between windings and the PCB circuit layer and between the windings and external metal is solved, the Q value of the windings is increased, the alternating current resistance and high-frequency loss of an inductor and a transformer are reduced, and the working efficiency of the converter is improved; a plane magnetic element is further adopted, and the miniaturization and flattening of products are guaranteed; temperature rising of the magnetic element is reduced greatly, and the working environment of a semiconductor device is improved.

A semiconductor topography is provided which includes a magnetic field shield layer formed upon a semiconductor device. In particular, the semiconductor topography may include a ferromagnetic layer adapted to shield underlying layers from external magnetic fields. Such a ferromagnetic layer may include either ferrite and / or non-ferrite materials. In some embodiments, the semiconductor topography may include a magnetic field shield layer with a different pattern configuration than an adjacent passivation layer. Consequently, a method for processing a semiconductor topography which includes patterning a magnetic field shield layer to form openings other than bond pad openings within the semiconductor topography is provided.

The present invention features that the flexible electrically conductive fabric has base fabric woven with metal fiber in 35-45 % and cotton fiber in 55-65 %, surface metal or alloy coating including one priming layer and one outer layer. The present invention can shield high strength electromagnetic field effectively and has resistance of as low as 1 micro-ohm / cm, shield effect up to 90-120 dB on electromagnetic wave in the frequency range of 0.15 MHz to 20 GHz and magnetic field shielding effect up to 40-50 dB. The present invention has the advantages of being light, ventilating, transparent, non-toxic, fireproof, etc. and is especially suitable for use in fields needing shield on strong electromagnetic wave.

A passive magnetic field shielding system for shielding a fringe magnetic field is described. The passive magnetic field shielding system includes a magnet configured to generate a uniform magnetic field, an imaging system with associated electronics coupled to the magnet, and a passive shield configured to reduce the strength of the fringing magnetic field to approximately five Gauss at a distance from the passive shield.

The invention discloses a superconducting magnet. The superconducting magnet comprises double-pancake coils (1), superconducting connectors (2), magnet current leads (3), magnetic field shielding tubes (4), a packaging drum (5), magnet current lead grooves (6) and an epoxy hole (10); a plurality of double-pancake coils (1) are tightly connected along axial directions of the coils, the double-pancake coils (1) are connected with superconducting belts (5) through the superconducting connectors to reduce heat, and the intensity of a magnetic field where the magnet current leads (3) are positioned is reduced through the magnetic field shielding tubes (4), so that electromagnetic force applied to the magnet current leads (3) is reduced. A circular cake-shaped magnet end plate (9) is sleeved at the upper ends of the double-pancake coils (1) which are tightly connected, and one end of each of two magnet current leads (3) at the upper end of the magnet end plate (9) is sleeved in each magnetic field shielding tube (4).

A wireless power transmission device for a vehicle is provided. The wireless power transmission device according to an exemplary embodiment of the present invention comprises: a wireless power transmission module comprising at least one flat coil for transmitting wireless power and a magnetic field shielding sheet arranged on one surface of the flat coil; a heat radiating case for radiating heat generated by a heat source, with the wireless power transmission module being coupled to one side thereof and at least one circuit board for driving the wireless power transmission module being embedded therein; a heat radiating coating layer applied to the outer surface of the heat radiating case; and a cover detachably coupled to the heat-radiating case. The wireless power transmission device for the vehicle described above may be installed or embedded within a vehicle for using in charging the main battery of a portable terminal.

To suppress a spread of not only a recording magnetic field generated from a main pole but also a high-frequency magnetic field generated from a spin torque oscillator in a microwave assisted magnetic recording head. The main pole and the spin torque oscillator are surrounded by a trailing shield layer and are also surrounded by a side / leading shield layer with an insulator sidegap layer interposed therebetween, and a high-frequency magnetic field shield layer, which absorbs a high-frequency magnetic field generated from the spin torque oscillator, is arranged in at least part of the shield layers.