Abstract: A dental magnetic attachment which has a superior magnetic attractive force with a small nonmagnetic welded part and a flat welded surface to be polished. The dental magnetic attachment including a magnet, a yoke with a pit to hold the magnet, a sealing disk placed on the opening of the pit to cover the magnet and a nonmagnetic welded part between the yoke and the disk. The yoke and the disk are made from soft magnetic material. The nonmagnetic welded part, which joins the yoke and the disk, is formed by welding the yoke, the sealing disk, the sealing ring made from nonmagnetic austenitic stainless steel and a Ni coat between the sealing disk and the sealing ring together. Here, it is preferably that there remains a part of the nonmagnetic sealing ring. The welded surface of the dental magnetic attachment is polished to be flat.

Abstract: For a plastic component with a high filling grade (1), which is connected to a basic body (5), it is provided, in order to avoid the occurrence of cracks in the plastic component under changing thermal conditions, that the plastic component (1) is not fixed directly to the basic body (5) but via at least one intermediary (12) made of elastic material, with the intermediary being embedded by a frictional and/or positive connection with at least one projection (24) in a groove or opening (28) of the plastic component (1).

Abstract: The present invention provides an Fe—B—R based permanent magnet, which has a chemical conversion coating film formed on its surface with an aluminum film interposed therebetween, the chemical conversion coating film containing at least one of titanium and zirconium, phosphorus, oxygen and fluorine as constituting elements, and a process for producing such an Fe—B—R based permanent magnet. In the permanent magnet, the chemical conversion coating film is adhered firmly to the magnet with the aluminum film interposed therebetween and hence, the magnet is excellent in corrosion resistance. Even if the magnet is left to stand for a long time under high-temperature and high-humidity conditions of a temperature of 80° C. and a relative humidity of 90%, the magnet exhibits a stable high magnetic characteristic which cannot deteriorate. Moreover, the film is free from hexa-valent chromium.

Abstract: An object of the present invention is to provide an Fe—B—R permanent magnet that exhibits stabilized high magnetic properties, wear resistance, electrical insulating performance, and corrosion resistance and shows minimized deterioration from the initial magnetic properties when exposed for an extended time to atmospheric conditions of a temperature of 80° C. and relative humidity of 90%, by providing a coating film having outstanding adhesion with the Fe—B—R permanent magnet and improved wear resistance and corrosion resistance. After cleaning the surface of the permanent magnet body by ion sputtering or the like, an Al or Ti coating film is formed on the surface of that magnet body by a vapor film-forming method such as ion plating, and then an aluminum oxide coating film is formed by a vapor film-forming method such as ion plating while introducing either simple O2 gas or a rare gas containing O2.

Abstract: With a high-grade plastic component, e.g. a plastic-bonded permanent magnet (1; 2), which is fixed to a basic body (4; 5), the basic body (4; 5) shows at least one strap-shaped part (7; 8) for the purpose of fixing it to the plastic component. In order to avoid the plastic component (1; 2) tearing off the basic body (4; 5), the strap-shaped part (7; 8) is surrounded with the high-grade plastic during manufacture of the plastic component and is arranged in the high-grade plastic in such a way that it can take up contraction strains of the high-grade plastic after manufacture of the plastic component at least partly by bending.

Abstract: A combination of magnets provides a substantially uniform external magnetic field, in which a plate shaped magnet generates an external magnetic field and a frame shaped magnet generates another external magnetic field. The frame and plate shaped magnets are disposed proximate each other to provide, through the combination of their external magnetic fields, the substantially uniform external magnetic field in a plane disposed substantially parallel to the plate and frame shaped magnets. The size, shape and relative position of the magnets combine to produce an external magnetic field having a highly uniform magnetic field orientation over a wider area of a plane disposed proximate the magnets than heretofore available.

Abstract: A sensor system for measuring linear displacement of a first member relative to a second member, includes an analogue Hall Effect sensor secured to the first member in an orientation to sense magnetic flux in a sensing direction perpendicular to said direction of relative movement, and a permanent magnet secured to the second member and having a front surface facing the Hall Effect sensor and extending along the direction of relative movement between the first and second members. The permanent magnet is magnetized so that the front surface has a first magnetic pole of a first magnetic polarity at a first end and a second magnetic pole of a second magnetic polarity at a second end spaced from the first end in the direction of travel.

Abstract: An R—Fe—B permanent magnet body is cleaned by ion sputtering, after which a Ti coating film is formed on the surface of the magnet body by a thin film forming method such as ion plating, after which an Al coating film is formed as an intermediate layer, after which an AlN coating film, TiN coating film, or Ti1−xAlxN coating film is formed by a thin film forming method such as ion reactive plating in N2 gas. By having the Al coating film layer present as an intermediate layer, it acts as a sacrificial coating film for the permanent magnet body and the foundation layer Ti coating film, whereupon adhesion with the Ti coating film is sharply improved, and the time until corrosion develops is lengthened, even in such severe corrosion resistance tests as salt water spray tests. Thus R—Fe—B permanent magnets are obtained which exhibit outstanding salt water spray resistance and wear resistance and which have stable magnetic characteristics.

Abstract: A plastic-bonded ring magnet (1) with a ring-shaped basic body (2) for fixing the magnet (1) onto a shaft is laid out in such a way that the magnet (1) is essentially located at the front (11) of the basic body (2), the inside diameter of the basic body (2) being smaller than the one of the magnet and the outside diameter of the basic body (2) and the magnet (1) being essentially identical. In particular for the purpose of improving the safety against torsion of the magnet (1) on the basic body (2) and facilitating the injection-moulding manufacture of the magnet (1) on the basic body (2), the basic body (2) shows at least one axially oriented, channel-shaped recess (5) which is filled with magnetic material.

Abstract: A fluid control valve, which can control a fluid having a pressure in the order of 10 kg/cm2, has a response time in the order of several milliseconds can be made small in size, and a fluid supply/exhaust system that provides less gas counter flow in the event of a plurality of valves being used. A fluid control valve of the invention controls a fluid moving in a valve body by closing and opening a portion between a valve seat and a valve holder by use of a drive unit. The drive unit has a rod-shaped shaft for application of pressure through the valve seat and the valve holder, and a member “a” fixed around the rod-shaped shaft. The member “a” is made from a magnetic material, and has a space between it and the shaft. A coil provided in parallel to the shaft, moves the shaft via the member “a” up and down by electromagnetic induction, and makes use of a spring force to close and open a portion between the valve seat and the valve holder.

Abstract: A magnetic bail mechanism utilizing opposed, cooperating magnetic means, each having a plurality of magnetic regions which, when in cooperating relationship, contribute torque and provide a tendency for the magnetic means to separate throughout the bail range. The magnetic means interface to provide a maximum separation tendency between the magnetic means at the trip point of the bail and a minimum separation tendency at each of the cast and retrieve positions. The magnetic means provide a torque force urging the bail into the retrieve position when the bail is located between the retrieve position and the trip point and a torque force urging the bail into the cast position when the bail is located between the trip point and the cast position. The magnetic means are prevented from assuming any arrangement whereby facing regions of opposite polarity are substantially axially aligned.

Abstract: A hard magnetic alloy obtained by heat treatment, at a heating rate of 20° C./min or more, of a glassy alloy containing Fe as a main component, at least one element R selected from the rare earth elements, at least one selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and Cu, and B, and having a supercooled liquid region having a temperature width &Dgr;Tx of 20° C. or more, which is represented by the equation &Dgr;Tx=Tx−Tg (wherein Tx indicates the crystallization temperature, and Tg indicates the glass transition temperature), and a sintered compact, a cast magnet, a stepping motor and a speaker each of which includes the hard magnetic alloy.

Abstract: Magnetic apparatus for MRI/MRT probes and methods for construction thereof are disclosed. One embodiment includes a pair of opposed magnet assemblies defining an open region therebetween, a transmitting RF coil having at least a portion thereof disposed within the open region, at least one receiving RF coil disposed within the open region and X,Y and Z gradient coils. At least one of the X,Y and Z gradient coils is disposed outside of the open region. Another embodiment of the apparatus includes a single magnet assembly having a first surface and a second surface opposing the first surface, a transmitting RF coil having at least a portion thereof opposing the first surface, at least one receiving RF coil and X,Y and Z gradient coils. At least one of the X,Y and Z gradient coils opposes the second surface. In another embodiment the magnet assembly generates a permanent z-gradient magnetic field and therefore includes only X and Y gradient coils, at least one of which opposes the second surface.

Abstract: A vacuum sputtering apparatus (1) is described in which a target (7) having a target face (8) is mounted in a vacuum chamber (2) opposite a substrate (15). A magnetic pole plate (16) having a non-magnetic carrier plate (17) attached thereto is mounted behind the target (7) on a shaft (28) and can be rotated by means of a motor (29) about an axis substantially orthogonal to the target face (8). Carrier plate (17) has an array of holes (19) each of which can receive a corresponding first bar magnet (20, 21). There are fewer magnets (20, 21) than there are holes (19) and the magnets (20, 21) are removable from their holes (19). Carrier plate (17) also has a circumferential line of holes (22), in each of which may be mounted a corresponding second bar magnet (23). By varying the number and positions of the bar magnets (20, 21, 23) in the holes (19, 22) a variety of different high density plasma zone shapes (24; 25, 26; 27; 28) can be produced upon the target face (8).

Abstract: A magnet tool and method of assembly, utilizes an alignment insert in a central opening of the magnet to coaxially align fastener guide holes through polar plates or protective covers on opposing planar sides of the magnet and a fastener guide hole in the insert, whereby insertion of the fastener through the guide holes laterally aligns the components of the assembly without the use of adhesive. A method of assembly of the tool without the use of adhesive is also described.

Abstract: A magnet set forth used is in a drain plug. A drain plug is assembled with an attached holder securing an inserted cylindrical magnet. The drain plug is formed of non ferrous material such as brass, aluminum, stainless steel, etc. It is constructed in accordance with industry standards to fit as a replacement device in oil drain pans, and is non ferrous material. It incorporates an extending threaded shaft. The holder is constructed with an axial passage there through having threads at the small end for threading through the drain plug. The passage extends fully through the device, interrupted by a transverse internal registration shoulder at the middle, and defines an extending skirt fitting loosely around an elongate cylindrical rare earth magnet. Also, a dipstick mounted version for small engines is shown and places the magnet on the dipstick in a magnet holder.

Abstract: A composite magnet having a steel back plate on which an inner section of a first magnetic material having a high residual magnetic strength and an energy product greater than 25 million and preferably 35 million G-Oe or greater is positioned. Although possessing such high residual magnetic strength, the first magnetic material contained in the inner section comprises less than 1/8 the entire volume of the composite magnet. A barrier surrounds the inner section, and an outer section of a second magnetic material abuts the barrier and surrounds the sides of the first magnetic material. Such second section of magnetic material has a low residual magnetic strength (i.e., 3,800-4,000 G), and an energy product greater than 3 million G-Oe.

Abstract: A magnetizing apparatus mounted around periphery of a conduit for exerting magnetic fields to fluids such as water flowing through the conduit. The apparatus comprises a pair of cases being freely opened on one side; a pair of grooves formed inside the cases respectively, and a pairs of holders installed in the grooves for holding a plurality of permanent magnets with the magnets being aligned along the length of the grooves. On the cases being faced, the grooves are opposed to each other to form a hole for introducing the conduit, and the paired holders are opposed to each other, with the rows of the magnets being opposed to each other. Furthermore, one or both of the opposing holders are supported by elastic members.

Abstract: An animal pill magnet having a casing, core pieces, and at least one magnet. The casing comprises a first capsule half and a second capsule half that are joined together with a single joint to enclose the core pieces and at least one magnet.

Abstract: Disclosed is a rare earth-based, magnetically anisotropic permanent magnet material consisting of a rare earth element, e.g., neodymium or praseodymium, iron optional in combination with cobalt and boron and having excellent magnetic properties by virtue of the magnetic coupling between the magnetically hard and soft phases. The magnet material has a structure consisting of crystalline particles of, e.g., Nd.sub.2 Fe.sub.14 B, having a particle diameter of 1 .mu.m or larger and fine crystals of iron of submicron size in a rod-shaped or platelet form precipitated within each crystalline particle of Nd.sub.2 Fe.sub.14 B. This magnet material can be prepared by several different methods including, for example, a solid phase reaction of an intermetallic compound of Nd.sub.2 Fe.sub.17 with boron to effect a double decomposition reaction producing Nd.sub.2 Fe.sub.14 B and iron.

Abstract: The invention is a fixture assembly for magnetizing a permanent magnet hollow cylindrical member to produce a high axial magnetic field in the cylindrical member's axial bore. The fixture assembly has at least one high permeability soft magnetic component positioned along the cylindrical member's longitudinal axis. A means for maintaining the high permeability soft magnetic component positioned along the cylindrical member's longitudinal axis is present. A means for directing a high magnetic field through the high permeability soft magnetic component and hollow cylindrical member provides magnetization of the cylindrical member.Also disclosed is a method of magnetizing a hollow cylindrical member to produce a high axial magnetic field in the cylindrical member's axial bore using the fixture assembly.

Abstract: A trapped field magnet formed of a high temperature type II superconductor material is disclosed. The trapped field magnet is formed of a plurality of relatively small, single-grain superconductive elements. Optimal shaped of these elements is in a regular truncated cone wherein the half cone angle is 55.degree., and the optimal orientation of each single-grain superconducting elements is an angle of .phi..sub.m with respect to the axis perpendicular to the upper and lower surface of the element, wherein the .phi..sub.m =3 sin .theta. cos .theta./(3 cos.sup.2 .theta.-1) and .theta. determines the location of the element.

Abstract: A magnet roller capable of adjusting the height and position of a magnetic force peak after formation of a roller, and easily meeting a requirement to attain a complex magnetic force pattern without significantly increasing the cost. In the magnet roller, at least two kinds of first magnet pieces and second magnet pieces different from each other in orientation characteristic of magnetic powders are fixedly disposed around the outer periphery of a shaft. The first magnet pieces is a magnet piece in which anisotropic magnetic powders are oriented in such a manner to converge from both the side surfaces and the back surface to a specific position on the front surface side.

Abstract: A two-dimensional array of magnetomechanical markers is adhered to a continuous web. A magnetizer element is scanned across the web to magnetize the bias elements in a group of the markers with a first polarity, thereby activating the group of markers. The web is then advanced and the magnetizer is scanned across the web in an opposite direction to the previous scan, to magnetize the bias elements of a second group of the markers with a second polarity, thereby activating the second group of markers. The web is slit in a longitudinal direction to produce web-strips each carrying a column of the activated markers. The web-strips are rolled to form marker roll assemblies each having about half the bias elements magnetized with a first polarity and the remaining bias elements magnetized with an opposite polarity. The roll of activated markers forms no more than a minimal "leakage" magnetic field.

Abstract: A magnetic vacuum oven mounted in a two piece steel magnet core. The two sections of the magnet slide apart on rails to provide easy access to the interior of the machine for maintenance and repair. The magnet core includes a "safe door" that is mounted on an articulated hinge or other hinge mechanism. The safe door provides direct access for product introduction to and removal from a central chamber surrounded by an applied magnetic field. Two electromagnet elements are mounted around the central chamber. One of the electromagnet elements is mounted in the front section of the housing, and one of the electromagnet elements is mounted in the rear section. The coils are separated by a small air gap to allow vacuum evacuation of the interior of the chamber. The magnetic coils are generally rectangular, and are water cooled to maintain a stable temperature when they are drawing power in operation.

Abstract: An encapsulated magnet assembly has a magnet encapsulated during a two-step molding process. The first step includes molding a first molded section over a magnet assembly. The second step of the process includes molding a second molded section over the magnet and the first molded section in such a manner that the entire magnet is covered by the two molded sections completely. A first parting line is defined between the first and second molded sections along an elongate tapered section of the first molded section at the one end of the assembly. A second parting line is defined between the first and second molded sections at a dovetail on the first molded section. An outwardly tapered surface is provided on the dovetail. The two parting lines define leak-free seams between the two molded sections thereby sealingly encapsulating the magnet within the two molded sections.

Abstract: A method and apparatus for passively shimming a magnet. A magnetic field produced by the magnet is measured and modeled in the form of a Legendre polynomial expansion having a predetermined number of harmonic terms. The degree of non-homogeneity in the measured field is determined by examining the harmonic terms. A shim is then designed to correspond to a magnitude change of a harmonic term of the polynomial expansion in order to improve the homogeneity of the magnetic field. A metal plate is connected to or placed near a pole of the magnet, the shim is placed against the metal plate, and a plastic plate is attached to the metal plate such that the shim is held in place in a predetermined location against the metal plate.

Abstract: A magnet sheet 3 with a thickness of 0.05 to 0.15 mm is formed by molding a material obtained by adding magnetic particles to a synthetic resin material into a sheet and multiple pole magnetizing one surface of the sheet to form alternate N and S poles on that surface. A printing sheet 2 with a thickness of 0.05 to 0.15 mm, constituted by a paper sheet such as a high quality paper sheet or a coated paper sheet or a synthetic paper sheet or a synthetic resin film, is bonded to the non-magnetized surface of the magnet sheet 3. A magnet display sheet 1 , which has a thickness of 0.1 mm to 0.3 mm, is thus obtained, and it is capable of being printing on with a usual home or office copier or printer.

Abstract: A permanent magnet rectangular bar shaped to form a helix having a central ore and a longitudinal axis. The magnetic orientation of the helical permanent magnet bar is along the longitudinal axis forming a transverse helical magnetic field. An electron beam or charged particle passing near the longitudinal axis experiences acceleration causing the charged particles to radiate creating a high energy radiation source. In another embodiment, first and second permanent magnet helical bars are intertwined together, forming a cylindrical tube, with each of the intertwined helical bars having a magnetic orientation along the longitudinal axis in opposing directions. In another embodiment of the present invention, an iron ribbon or other high permeability magnetic material is interposed between cut-out portions between first and second intertwined helical permanent magnet bars. This effectively augments the transverse magnetic field.

Abstract: A process and apparatus for permitting the magnetization of flexible hard magnetic materials in the form of sheets or strips, such as magnetic rubber, wherein opposing arrays formed from alternating magnetic disks and flux conducting elements are use in sets of two with opposing polar moments such as to induce a magnetic flux in the gap between the discs. The width of the magnetic disk and flux conducting elements, respectively, are selected to optimize the magnetic pull strength of the material. At the array ends are flux conducting elements that are about 1/2 (i.e., from about 0.25 to about 0.75, and preferably from about 0.4 to 0.6) of the width of the internal flux conducting elements. A material to be magnetized is passed between the array sets in contrast with both disks and consequently imprinted with magnetic poles. The magnetized properties of the material is enhanced by passing the material through a second set of arrays which are axially offset with respect to the first set of arrays.

Abstract: In magnetic resonance imaging (MRI) apparatus in which weight considerations and accessibility of the patient result in a magnet 1 with a large bore 2, in order to enable spectroscopy or other activities requiring large magnetic fields to nevertheless be carried out, a small magnet 4 with its own cryostat can be moved from an inoperative position A to an operative position B, in which the large magnet acts as a shield winding for the small magnet.

Abstract: A multipolar magnetic ring that generates a sinusoidal magnetic field has a cylindrical shape and two magnetic poles, north (N) and south (S), which are imbricated one in the other in such a manner that their widths (L.sub.p) are equal and constant. Two magnetic transitions between each of the two poles each follow a continuous curve that moves by one half pole width for each quarter of a turn of the magnetic ring, with the two curves being shifted by 180.degree. so that the magnetic field has a single period per turn of the magnetic ring. The magnetic field is implemented either along two spirals (s.sub.1 and s.sub.2) on one of the flat faces, or along two helixes (h.sub.1 and h.sub.2) on its cylindrical side. The magnetic ring may be used in absolute-position sensors, notably in bearings.

Abstract: A method of producing a radially anisotropic sintered R-Fe-B-based magnet wherein R is at least one rare earth element including Y, in which a green body stack comprising a plurality of compact bodies are formed in series by the same die. The density of the compact body is regulated to 3.1 g/cm.sup.3 or more, and increased at the final compacting step to a density at least 0.2 g/cm.sup.3 higher than that before the final compacting step. By so regulating the density of the green body, the cracking during the sintering process at the binding portion, an interface between the stacked compact bodies, can be minimized while retaining high magnetic properties of the resulting magnet.

Abstract: A Chiron Twister magnet structure is provided from a right circular cylinder constructed of a passive material, such as iron, formed into a continuous helical bar deployed around a tunnel-like working space, in which it produces a transverse helical magnetic field, and through which a charged particle beam is sent by an electron beam means, causing the electrons to move in a helical pattern. The continuous helical bar is coupled to an external magnetic field means. The continuous helical bar has a substantially rectangular cross section, with a plurality of south poles opposed by a plurality of north poles. The continuous helical bar may be constructed of a circular right cylinder, such as a pipe, made of iron, or any other high saturation passive magnetization material.

Abstract: Bonded magnets made from gas atomized powders of an rare earth alloy and having good hard magnetic characteristics are provided. The powders have an alloy composition comprising approximately 15 to 34 weight % of RE, 0.8 to 1.2 weight % of B, 0.5 to 4 weight % of TiC, balanced with at least one of Fe and Co, wherein RE is one or more rare earth elements selected from the group consisting of Y, La, Ce, Pr, Nd, Sm, Er, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu.

Abstract: A cow magnet is provided having two magnets and a metal plate inside of a nontoxic cover. The non-toxic cover is preferably a plastic cover having a hollow interior, a cylindrical exterior, and two rounded ends. The two magnets a preferably constructed of ceramic materials. The metal plate is positioned between the two magnets to concentrate the magnetic field produced by the two magnets.

Abstract: A magnetic yoke also serves as a case for an irreversible circuit element. The magnetic yoke has a surface which is covered with such a high-conductivity metal coating film that an electric resistivity is 5.5 .mu..OMEGA. cm or less. Thereby, a signal energy is efficiently maintained. An input signal is transmitted to an output terminal with less loss.

Abstract: In a magnetic cylinder for holding printing plates and the like in which magnetic elements are located and held in place in recesses formed on the outer surface of the cylinder, a thin substantially non-magnetic foraminate layer is located at the bottom of the recesses and the magnetic elements rest against the foraminate layer.

Abstract: A method for making micromagnets and magnets with a micro-polarization pattern on at least one surface thereof.

Abstract: A magnetic doorstop including a first section consisting of a magnet secured with a retaining shim mounted on an elongated adjustment screw and a second section consisting of a magnet secured with a retaining shim mounted on an attachment screw. The first section is attached to an interior wall of a dwelling and the second section is attached to the interior door. When the door is opened, the first and second sections contact magnetically securing the door in an open position.

Abstract: The addition of a chelating agent or a chelating agent and an antioxidant in combination to a rare-earth bonded magnet composition and a rare-earth bonded magnet comprising a rare-earth magnetic powder and a resin component can provide improved moldability and magnets having high performance and high corrosion resistance. Further, the regulation of property values of the magnet composition enables the occurrence of troubles to be avoided during molding, resulting in improved productivity. Furthermore, the use of at least two resins as a resin component in an extruding composition contributes to improvement in moldability and consequently increase in throughput. Furthermore, the use of extrusion, involving setting by cooling, and not compression molding in the production of magnets can provide high-density, high-performance magnets.

Abstract: A complex magnetic field generating device, comprising a frame, a plurality of magnets capable of producing a magnetic field, wherein each of the plurality of magnets has a north pole and a south pole and a longitudinal axis passing therethrough, the plurality of magnets are positioned in a side by side axis parallel orientation and are partially held in place by the frame, a coil of electrically conducting material wrapped about the plurality of magnets and orthogonal to the longitudinal axis of each of the plurality of magnets, and a source of electrical energy for supplying an electrical current to the coil enabling a magnetic field detectable with iron filings to be produced therefrom. A switch is provided to enable the electrical current to flow in a first direction and a second direction opposite to the first direction.

Abstract: In a mobile magnetic resonance imaging van, the challenge is to design a magnet mounting system such that the top and bottom poles of the magnet are within magnet temperature gradient specifications for good image quality. The present invention provides such a mounting system and method for mounting a permanent magnet in a mobile trailer vehicle. Mounting bolts are used to mount the permanent magnet to the floor of the mobile trailer vehicle. Laminate or composite insulating material, preferably stacked Phenolic pads, thermally insulate the permanent magnet from the trailer floor. A second set of stacked insulating material pads thermally insulate the mounting bolts from the permanent magnet.

Abstract: A rare earth bonded magnet obtained by mixing two types of magnetic powders (A) and (B) in the present invention has a high residual magnetic flux density (Br), a large intrinsic coercive force (iHc) and a large maximum energy product ((BH)max) in spite of a low rare earth element content, and shows an excellent rust preventability. A rare earth-iron-boron type magnet alloy of the present invention has a residual magnetic flux density (Br) as high as not less than 10 kG, an intrinsic coercive force (iHc) as large as not less than 3.5 kOe and a large maximum energy product ((BH)max) and which has an excellent rust preventability.

Abstract: A force rebalance accelerometer includes a proof mass suspended by one or more flexures between stationary mounted upper and lower excitation rings. Pick-off capacitance plates formed on opposing sides of the proof mass form capacitance elements whose capacitance varies in response to displacement of the proof mass to provide a displacement signal. The displacement signal is applied to one or more electromagnets, used to force the proof mass back to a null or at-rest position. The drive current applied to the electromagnets thus represents the force or acceleration applied to the accelerometer. The electromagnets include a magnet and a pole piece which forms a magnetic return path. In order to relieve stresses due to thermal expansion, the magnet is spaced apart from the pole piece to enable the bonding area to be constrained to a minimum which, in turn, reduces the overall stress on the accelerometer.

Abstract: Static magnet pole tips for a MRI system in which the static magnet pole tips are cut from a slug of spirally wound ferromagnetic material. The static magnet pole tips are cut from the spirally wound slug such that the static magnet pole tips have no or few semi-closed loops of ferromagnetic material. The static magnet pole tips can be used individually, or can be stacked for strength and symmetry.

Abstract: The composite magnet comprises two sections, each section having a plurality of projections and apertures. The projections and apertures on a first section mate with the apertures and projections, respectively, on the second section. The first and second sections are magnetized in opposite axial directions.

Abstract: A very high field micro roller magnetic recorder of 20 poles having an outside diameter of 0,130" is disclosed, as is the method for making such a micro roller magnetic recorder. The phrase, "very high field", as applied to the micro roller recorder of the present invention is defined as a surface field intensity of at least 1000 Oe. Rather than mounting discrete magnets around the periphery of a non magnetic drum in fabricating a magnetic roller recorder, the present invention teaches use of a magnetizable cylinder of high energy magnetic material, such as NdFeB, magnetized to saturation in a pattern of circumferentially located poles by use of a fixture fabricated as follows. A solid conducive cylinder is slotted in the axial direction to generate a serpentine conductive pattern to which lead wires are connected. The cylinder is potted in epoxy, and the center bored out to accept the small diameter high magnetic energy roller to be magnetized.

Abstract: A ferromagnetic flux path (20) extends between pole pieces (30,32). A superconducting coil (62) in series with a persistence switch (64) encircles the flux path. A pair of resistive coils (50,52) are disposed one at each pole piece. The resistive coils are overdriven near to the point of thermal failure to produce a 0.5 T or other preselected field strength in a gap between the pole pieces. The persistence switch is closed to stabilize and hold the flux through the superconducting coil. The resistive magnets are ramped down or shut off. During imaging, a smaller amount of current is directed to the resistive coils to supplement and focus the magnetic field from the superconducting coil through the gap between the poles. In this manner, high strength magnetic fields are generated in the gap using a relatively inexpensive combination of resistive and superconducting coils.

Abstract: The magnet roll of the present invention includes a shaft and a permanent magnet member fixed to the shaft, the permanent magnet member being composed of a hollow, cylindrical magnet body, and a magnetic pole piece fixed to a recess of the hollow, cylindrical magnet body, the hollow, cylindrical magnet body having a plurality of axially extending magnetic poles arranged circumferentially on the surface, the magnetic pole piece being provided with two magnetic poles having the same polarity for constituting a developing magnetic pole, and a thermally demagnetized portion being formed substantially at a center of the developing magnetic pole such that the permanent magnet member generates a magnetic flux density distribution having two peaks of the same polarity at a position of the developing magnetic pole.