33results about How to "Reduce magnetic field leakage" patented technology

A perpendicular magnetic recording medium is disclosed that includes a recording layer having a columnar granular structure possessing an appropriate diameter distribution and uniform arrangement of magnetic particles. The perpendicular magnetic recording medium includes a substrate, and a soft-magnetic underlayer, a seed layer, an underlayer, a recording layer, a protection film, and a lubrication layer stacked on the substrate in order. The underlayer includes granular crystals formed from Ru or a Ru alloy and interstices separating the granular crystals from each other so as to isolate individual granular crystals. A continuing film formed from Ru or Ru alloys may be provided below the underlayer.

A perpendicular magnetic recording medium is disclosed that includes a recording layer having a columnar granular structure possessing an appropriate diameter distribution and uniform arrangement of magnetic particles. The perpendicular magnetic recording medium includes a substrate, and a soft-magnetic backup layer, a seed layer, an underlayer, a recording layer, a protection film, and a lubrication layer stacked on the substrate in order. The underlayer includes granular crystals formed from Ru or a Ru alloy and interstices separating the granular crystals from each other so as to isolate individual granular crystals. A continuing film formed from Ru or Ru alloys may be provided below the underlayer.

Embodiments of the invention provide a magnetic head which prevents data on a recording medium from being erased even when a stray field is applied. In one embodiment, an auxiliary pole is sandwiched between a stray-field shield composed of a magnetic layer recessed from the air bearing surface and a main pole. The stray-field shield may be formed on the leading side of the auxiliary pole. A face of the stray-field shield on a medium side may be recessed from an air-bearing-surface of the magnetic head.

A heat-treating furnace with a magnetic field comprising (a) a magnetic field-generating means constituted by an outer, ring-shaped, permanent magnet assembly comprising a plurality of permanent magnet segments combined with their magnetization directions oriented such that a magnetic flux flows in a diameter direction, and an inner, ring-shaped, permanent magnet assembly disposed inside the outer, ring-shaped, permanent magnet assembly and comprising a plurality of permanent magnet segments combined with their magnetization directions oriented such that a magnetic flux flows in a diameter direction; and (b) a heat treatment means disposed in a center hole of the inner, ring-shaped, permanent magnet assembly and comprising a cooling means, a heating means, and a heat-treating container containing heat-treating holder for holding a plurality of articles to be heat-treated in this order from outside, wherein an axial center of a magnetic field generated by the inner and outer ring-shaped, permanent magnet assemblies is substantially identical with an axial center of an article assembly in the heat-treating container.

Embodiments of the invention provide a magnetic head which prevents data on a recording medium from being erased even when a stray field is applied. In one embodiment, an auxiliary pole is sandwiched between a stray-field shield composed of a magnetic layer recessed from the air bearing surface and a main pole. The stray-field shield may be formed on the leading side of the auxiliary pole. A face of the stray-field shield on a medium side may be recessed from an air-bearing-surface of the magnetic head.

A perpendicular magnetic recording medium is disclosed that is able to prevent the Wide Area Track Erasure phenomenon from occurring and is capable of high density recording. The perpendicular magnetic recording medium includes a substrate; a soft-magnetic backup stack structure including a first magnetic layer, a first non-magnetic coupling layer, and a second magnetic layer stacked on the substrate in order; an intermediate layer formed from a non-magnetic material on the soft-magnetic backup stacked structure; and a recording layer on the intermediate layer, the recording layer having an easy axis of magnetization perpendicular to the surface of the substrate. The first magnetic layer and the second magnetic layer are formed from a poly-crystal soft-magnetic material, each of the first magnetic layer and the second magnetic layer has an easy axis of magnetization in the surface thereof, and the magnetization of the first magnetic layer and the magnetization of the second magnetic layer are coupled and anti-parallel to each other.

A transmission antenna includes a closed-loop core having at least two electrically-conductive windings arranged on the closed-loop core. The windings are each electrically-actuated to generate a magnetic flux along the closed-loop core in opposing directions. The transmission antenna may generate a polarized magnetic field within a plane of the closed-loop core and provide broadband transmission of a polarized signal having a relatively flat frequency response. The transmission antenna is electrically-small, and the frequency of the polarized signal is nearly independent of the size of the closed-loop core. Multiple polarized signals may be provided, each being independently and continuously controlled through actuation of the windings. The direction of the polarized signal may also be varied. Additional windings for receiving a signal may simultaneously be employed on the closed-loop core. A method for transmitting a polarized signal with the transmission antenna is also provided.

Provided is a signal coupling device which suppresses the leakage of magnetic field to the outside from a signal line connecting between a PLC modem and the signal coupling device, thereby reducing the influence of such magnetic field leakage on wireless equipment in the vicinity thereof. The signal coupling device includes: a signal coupling member having a hollow portion through which a power line penetrates; and a signal line covered with an insulating coating, the signal line having a penetrating portion penetrating through the hollow portion, and a first transmission portion and a second transmission portion which connect the opposite ends of the penetrating portion to the modem to thereby transmit a PLC signal. The first transmission portion and the second transmission portion are arranged not coaxially but at a predetermined spacing from each other.

Provided are a wireless power communication system, including: a primary core where a primary coil, to which a current is applied, is wound; and a secondary core having a width wider than a width of the primary core, and receiving a secondary coil which outputs a current generated by a magnetic field, wherein the magnetic field is induced by the primary coil to the secondary coil, a wireless power transmission apparatus and a wireless power receiving apparatus therefor.

The invention relates to a linear compressor, and specifically provides a linear compressor comprising an outer stator, an inner stator arranged in the radial inner side of the outer stator at a preset gap, and a front flange arranged on the axial side of the outer stator; specially, the inner stator is provided with a coil; the axial length of the outer stator is bigger than that of the inner stator, thus reducing or preventing magnetic field, generated by the coil, from leaking outside the inner and outer stator; the inner periphery, close to the end portion of the front flange of the linear compressor, of the outer stator is provided with a groove. In the axial direction of the linear compressor, the outer stator is bigger in length than the inner stator, thus greatly reducing or preventing magnetic field, generated by the coil, from leaking outside the inner and outer stator, improving magnetic field density in the inner and outer stators, and obviously improving linear compressor efficiency.

Two closed-loop coils are respectively set at the top or the bottom of a cathode ray tube. These two closed-loop coils serves in a pair as a cancel coil. Each closed-loop coil is positioned so as to make an interlinkage with the magnetic field leakage that escapes from the deflection yoke, a part of the closed-loop coil running almost in parallel to the top or bottom edge of an effective display region of a front panel.

A magnetic recording head includes a head body having an end divided into two parts, the two parts facing each other with a predetermined distance therebetween, first and second poles that are disposed on the two parts of the head body, respectively, to form a magnetic path and that face each other with a predetermined gap therebetween, and an anisotropic medium that is interposed between the first and second poles and has a magnetic anisotropy. A magnetic field going into the predetermined gap decreases so as to be induced in the predetermined magnetic recording direction.

A stage apparatus including: a magnet; a moving member configured to be supported so as to float by a magnetic force of the magnet and move in a first direction along a horizontal plane together with the magnet; and a fixed member having a magnetic material facing the magnet above the magnet in a movable area of the moving member, wherein side surfaces of the magnet in the first direction are covered by using a first magnetic field blocking surface of the moving member and a second magnetic field blocking surface of the fixed member.

A perpendicular magnetic recording medium is disclosed that includes a recording layer having a columnar granular structure possessing an appropriate diameter distribution and uniform arrangement of magnetic particles. The perpendicular magnetic recording medium includes a substrate, and a soft-magnetic underlayer, a seed layer, an underlayer, a recording layer, a protection film, and a lubrication layer stacked on the substrate in order. The underlayer includes granular crystals formed from Ru or a Ru alloy and interstices separating the granular crystals from each other so as to isolate individual granular crystals. A continuing film formed from Ru or Ru alloys may be provided below the underlayer.

A transformer includes: an upper primary substrate (110) which is formed by stacking a plurality of dielectric substrates, each substrate being provided with spiral conductive patterns; a lower secondary substrate (120) which is formed by stacking a plurality of dielectric substrates, each substrate being provided with spiral conductive patterns, in which the lower secondary substrate is positioned below the upper primary substrate (110) in such a way that the lower secondary substrate comes into contact with the upper primary substrate (110) or is spaced apart from the upper primary substrate (110); and a secondary coil element (200) of a planar shape to produce an induced current by a current applied to the upper primary substrate (110) and the lower primary substrate (120).

A camera module includes a carrier supported on a housing and movable in an optical axis direction, at least one frame supported on the carrier and movable, relative to the carrier, in at least one direction perpendicular to the optical axis direction, and a lens module supported on the frame. The frame is supported on the carrier such that attractive force acts in the at least one direction perpendicular to the optical axis direction.

The invention provides a single magnetic pole linear compressor. The single magnetic pole linear compressor comprises a housing, a rotor, a piston and an air cylinder, wherein the rotor, the piston and the air cylinder are disposed in the housing; the single magnetic pole linear compressor further comprises a single magnetic pole stator; the single magnetic pole stator is in a circular structure; a circular groove is formed in an inner end face of the single magnetic pole stator; a coil is disposed in the circular groove; the rotor is inserted in the circular groove; the air cylinder is fixed on an outer end face of the single magnetic pole stator. By adopting the single magnetic pole stator in an integrated structure, a magnetic field generated by the coil can flow in the stator and the magnetic field leaking from the stator is reduced, thus the iron loss phenomenon is avoided and the working efficiency is effectively improved; meanwhile the air cylinder is directly mounted and fixed on the end face of the single magnetic pole stator so that the air cylinder is far away from the magnetic field formed by the coil, the leakage of the magnetic field can be further reduced, and the working efficiency of the single magnetic pole linear compressor is improved.

The invention provides a combined inductor, and the inductor comprises a drum-shaped magnetic core and a magnetic sleeve used for shielding magnetic flux leakage; a multifunctional isolation hood which does not need to be positioned by a mold, is locally and fixedly connected by epoxy resin and is used for integrally positioning the drum-shaped magnetic core and the coil winding and self-tensioning, clamping and fixing the drum-shaped magnetic core and the coil winding in the center of the magnetic sleeve after being inserted is further nested and fixed at the periphery of the drum-shaped magnetic core; the multifunctional isolation hood is composed of a pair of symmetrically-arranged bottom metal terminal sheets and an isolation cylinder, the bottom end of a drum-shaped magnetic core is bonded and fixed to the centers of the pair of symmetrically-arranged bottom metal terminal sheets through epoxy resin, and a coil winding is wound on the drum-shaped magnetic core; the isolation cylinder is inserted into the magnetic core and the coil winding, and the outer edge of the top end of the isolation cylinder is clamped and connected to the inner side edge of the magnetic sleeve; the inductor is simple in structure, convenient to mount and process, convenient to position and fix, high in coplanarity and capable of effectively improving the production efficiency and the automatic production degree, and die positioning and curing processes after epoxy resin sealing in the prior art are omitted.

The invention relates to the technical field of microwave switches, and discloses an electromagnetic driving device and a microwave switch, the electromagnetic driving device comprises a sleeve, an iron core assembly is arranged in the sleeve, and the iron core assembly comprises a movable iron core, an upper static iron core arranged above the movable iron core and a lower static iron core arranged below the movable iron core; magnetic steel is arranged on the periphery of the movable iron core in the sleeve, and the movable iron core penetrates through the magnetic steel; the upper end of the movable iron core is provided with an upper magnetism isolating gasket and an upper guide rod, the upper guide rod penetrates through the upper static iron core, the lower end of the movable iron core is provided with a lower magnetism isolating gasket and a lower guide rod, the lower guide rod penetrates through the lower static iron core, the periphery of the upper static iron core is sleeved with an upper coil assembly, and the periphery of the lower static iron core is sleeved with a lower coil assembly. In actual use, power does not need to be supplied to the coil all the time to keep the microwave channel of the microwave switch in a working state, and the power consumption of the electromagnetic driving device and the microwave switch in use can be reduced.

The invention discloses a multi-tap wireless power transmission system and an efficiency optimization method thereof, belongs to the technical field of wireless power transmission systems, and solvesthe problems of low transmission efficiency and high cost of a wireless power transmission system in the prior art. The transmission system comprises a direct-current power supply, wherein the direct-current power supply is electrically connected with a high-frequency inverter, the high-frequency inverter is electrically connected with a transmitting end resonance network, the resonance network iselectrically connected with a transmitting coil, the transmitting coil internally comprises multiple sections of sub-coils, each section of sub-coil is electrically connected with a control switch and a resonance compensation capacitor which are matched with each other, a receiving coil is arranged in a high-frequency alternating magnetic field generated by the transmitting coil, the receiving coil is electrically connected with a receiving end resonance network and a rectifier bridge, and the rectifier bridge is electrically connected with a load resistor. The multi-tap wireless power transmission system has the advantages of high transmission efficiency, simple control, no need of communication and low cost.

The invention discloses a power circuit with constant power output, which includes a transformer and a capacitor C, specifically connected as follows: the primary coil L1 of the transformer is connected in series with the capacitor C to form the input end of the circuit, and one end of the secondary coil L2 is one of the output ends of the circuit terminal, the other end of the secondary coil L2 and one end of the secondary coil L3 are commonly grounded, and the other end of the secondary coil L3 is the other end of the circuit output. The invention utilizes the resonant principle, and the resonant impedance is close to resistive, so the power factor tends to be 1. Since it no longer depends on the magnetic flux leakage shunt to work, the magnetic field leakage is low, and the iron loss and copper loss are very small. The invention is a green lighting power supply with small volume, light weight, low cost and no electromagnetic environment pollution.

A racetrack-shaped magnetic-field-generating apparatus for magnetron sputtering comprising a linear portion and corner portions, the linear portion comprising a magnetic base, a center permanent magnet disposed on its surface, and side permanent magnets disposed on both sides thereof with a gap; the center and side permanent magnets being vertically magnetized with opposite polarities; the corner portions comprising a non-magnetic base, a center magnetic pole member disposed on its surface, a semicircular or semi-polygonal, peripheral magnetic pole member, and plural permanent magnets arranged between both magnetic pole members with their magnetization directions in parallel to a target surface; and the magnetic poles of plural permanent magnets opposing the center magnetic pole member having the same polarity as those of the center permanent magnet opposing the target.

The invention relates to the technical field of wireless power supply, and particularly discloses an induction type WPT bilateral LCLC topology for shielding a peripheral magnetic field and a parameter design method thereof. Based on the proposed bilateral LCLC topology structure, a primary side shielding coil and a secondary side shielding coil which are mutually decoupled with a transmitting coil and a receiving coil are constructed; when the current is in the same direction, the corresponding shielding coil is reversely wound, and when the current is in the reverse direction, the corresponding shielding coil is forwardly wound, so that the current directions of the primary and secondary shielding coils are respectively opposite to the current flowing through the transmitting coil and the receiving coil, and then the purpose of weakening magnetic field leakage between the transmitting and receiving coils is achieved; and the shielding magnetic field generated between the shielding coils can shield the magnetic field on the periphery of the receiving and transmitting coil on the premise that the energy transfer characteristic of the main magnetic field is not affected, and due to the topological characteristic of the LCLC, the ratio of the current in the shielding coils to the current in the receiving and transmitting coil can be changed through parameter design, so that the optimal shielding effect is achieved.

The invention relates to the field of electrical elements, in particular to a Rogowski coil which comprises a plurality of mutually connected winding frames and a limiting mechanism which is connected with the winding frames and limits relative rotation between the winding frames. The limiting mechanism comprises a base and a plurality of connecting assemblies, the winding frames are arranged on the base, the connecting assemblies are arranged between the adjacent winding frames, and the winding frames are connected end to end. The Rogowski coil has the effects of improving the stability of the Rogowski coil, improving the output linearity and precision and reducing the leakage of a magnetic field.

Two closed-loop coils are respectively set at the top or the bottom of a cathode ray tube. These two closed-loop coils serves in a pair as a cancel coil. Each closed-loop coil is positioned so as to make an interlinkage with the magnetic field leakage that escapes from the deflection yoke, a part of the closed-loop coil running almost in parallel to the top or bottom edge of an effective display region of a front panel.

The invention provides a nonreciprocal circuit element, comprising a ferrite component, a permanent magnet and a magnetic component, wherein, the ferrite component comprises a central electrode part inside which a plurality of electrode wires used as inductive elements are intersected at predetermined angles without electric contact; the ferrite component also comprises a matching capacitor electrode; the central electrode part and the matching capacitor electrode are formed on the surface of the ferrite component; the permanent magnet imposes a direct current magnetic field on the intersected position of the central electrode part; the magnetic part and any of the upper and the lower surfaces of the ferrite component form an integrated body; the magnetic part is made from magnetic material with the magnetic permeability bigger than that of the ferrite component.