Permanent Magnets Patents (Class 335/302)
  • Patent number: 7671712
    Abstract: The invention disclosed is a method of levitating one or both ends of an object permanently or temporarily, or altering the distance between two objects or the momentum of an object by manipulating the direction of the magnetic field of a permanent or electromagnet.
    Type: Grant
    Filed: March 23, 2006
    Date of Patent: March 2, 2010
    Assignee: Ellihay Corp
    Inventors: Todd S. Elliott, William F. Hayhurst
  • Publication number: 20100045411
    Abstract: An R-T-B based sintered magnet includes both a light rare-earth element RL (which is at least one of Nd and Pr) and a heavy rare-earth element RH (which is at least one of Dy and Tb) and Nd2Fe14B type crystals as a main phase. The magnet has a first region, which includes either the heavy rare-earth element RH in a relatively low concentration or no heavy rare-earth elements RH at all, and a second region, which includes the heavy rare-earth element RH in a relatively high concentration. The first and second regions are combined together by going through a sintering process.
    Type: Application
    Filed: April 11, 2008
    Publication date: February 25, 2010
    Applicant: HITACHI METALS, LTD.
    Inventors: Hiroya Kobayashi, Futoshi Kuniyoshi
  • Patent number: 7667562
    Abstract: A new class of fundamental devices and methods for their manufacture and use. The bulk magnetic field replicators of the present invention require no precision machining or alignment to accurately reproduce magnetic fields of any complexity, nor extreme positional stability to maintain superconductivity. Such bulk devices may be formed of either low or high critical temperature superconductive materials, but are particularly adapted to formation from high critical temperature materials.
    Type: Grant
    Filed: February 20, 1990
    Date of Patent: February 23, 2010
    Inventor: Roy Weinstein
  • Patent number: 7663327
    Abstract: A permanent magnet focusing system includes an electron gun that provides an electron ribbon beam having an elliptical shape. A plurality of permanent magnets provide transport for the electron ribbon beam. The permanent magnets produce a non-axisymmetric periodic permanent magnet (PPM) focusing field to allow the electron ribbon beam to be transported in the permanent magnet focusing system.
    Type: Grant
    Filed: May 15, 2006
    Date of Patent: February 16, 2010
    Assignee: Massachusetts Institute of Technology
    Inventors: Ronak J. Bhatt, Chiping Chen, Jing Zhou, Alexey Radovinsky
  • Publication number: 20100013585
    Abstract: A process for producing a highly anticorrosive rare earth permanent magnet, characterized by sequentially subjecting an R—Fe—B sintered magnet to surface finishing involving cutting and/or polishing, plating pretreatment, nickel electroplating to a given plating thickness, immersion in an aqueous solution containing a phosphoric salt, washing with water and heat treatment at 150° to 400° C. for 1 to 24 hr in an atmosphere of 1.3×103 Pa or higher oxygen partial pressure so as to form a thin nickel oxide layer at the surface layer portion.
    Type: Application
    Filed: May 30, 2007
    Publication date: January 21, 2010
    Inventor: Kazuo Tamura
  • Publication number: 20100007450
    Abstract: A tone wheel constituting a rotation detection magnetic encoder in combination with a magnetic sensor fixed onto a stationary side member, the tone wheel comprising a metal reinforcing ring fitted in a rotary side member and a circular multipolar magnet fixed to the metal reinforcing ring. the circular multipolar magnet is made of a plastic magnet of a circular resin molded product which contains a magnetic powder therein and is magnetized with a number of S and N poles alternatively along its circumference; the circular multipolar magnet is fixed to a surface of the metal reinforcing ring opposed to the magnetic sensor with an adhesive; and a restraint portion is provided at a part of the portion wherein the circular multipolar magnet is fixed to the metal reinforcing ring, thereby fixation of the circular multipolar magnet to the metal reinforcing ring is reinforced and depart of the circular multipolar magnet from the metal reinforcing ring is prevented.
    Type: Application
    Filed: December 27, 2006
    Publication date: January 14, 2010
    Inventor: Hideo Mizuta
  • Patent number: 7646274
    Abstract: A comparatively light and compact permanent magnet arrangement for an MRI apparatus has a pair of opposed permanent magnet arrays with a shimming system to adjust the uniformity and strength of a magnetic field in a central chamber of the apparatus. The MRI apparatus is used to examine the extremities of a patient to determine cardiovascular characteristics from an analysis of the blood flow through selected arteries in the extremity. The information collected can be used to calculate such characteristics as total cardiac output, blood flow, arterial wall thickness and elasticity and the presence of plaque.
    Type: Grant
    Filed: April 30, 2004
    Date of Patent: January 12, 2010
    Inventor: Uri Rapoport
  • Patent number: 7641793
    Abstract: A plurality of magnets can be positioned around a container through the use of a plurality of holders that can be releaseably positioned around the container. Each holder has an area compatible in shape to the magnet to hold a magnet. The base of the holder which contracts the container is of a shape compatible to that of the container. There is at least one aperture on at least two sides of the holder. A strap is placed through the apertures and secured at each end. This secures the magnets to the container. The holder can have a flexible base portion or can itself be flexible. The holders can be at an angle of about 150° to about 210° to the axis of the container. The magnets can be positioned in various polar arrays around the container. The container will hold an aqueous liquid either in a static or flow condition. The container can be a bottle, pipe conduit and/or a filter within pipe conduit system.
    Type: Grant
    Filed: August 17, 2005
    Date of Patent: January 5, 2010
    Inventor: Paul Michael Pedersen
  • Publication number: 20090322459
    Abstract: A permanent magnet is provided which has formed a Dy, Tb film on a surface of an iron-boron-rare earth sintered magnet of a predetermined shape, with diffusion thereof into grain boundary phases, having a higher coercive force. The method of manufacturing a permanent magnet includes a film-forming step of evaporating metal evaporating material containing at least one of Dy and Tb and adhering evaporated metal atoms to a surface of the iron-boron-rare earth sintered magnet, and a diffusing step of performing heat treatment to diffuse metal atoms adhered to the surface into grain boundary phases of the sintered magnet. The metal evaporating material contains at least one of Nd and Pr.
    Type: Application
    Filed: September 10, 2007
    Publication date: December 31, 2009
    Inventors: Hiroshi Nagata, Kyuzo Nakamura, Takeo Katou, Atsushi Nakatsuka, Ichirou Mukae, Masami Itou, Ryou Yoshizumi, Yoshinori Shingaki
  • Patent number: 7639013
    Abstract: With a view toward implementing a thermal controlling method for making reversible a temperature characteristic of a magnetic field generator using permanent magnets small in Hcj, a magnetic field generator whose temperature characteristic is reversible, using permanent magnets small in Hcj, and an MRI apparatus provided with such a magnetic field generator, there is provided a method for controlling the temperature of a magnetic field generator having a pair of disc-shaped permanent magnets whose magnetic poles opposite in polarity to each other are opposed to each other with spacing defined therebetween, and a yoke that forms return passes for magnetic fluxes of the permanent magnets, comprising the steps of raising the temperature from room temperature to a temperature higher than the room temperature, maintaining the temperature higher than the room temperature, and lowering the temperature from the temperature higher than the room temperature to the room temperature, whereby the temperature characteristi
    Type: Grant
    Filed: July 13, 2007
    Date of Patent: December 29, 2009
    Assignee: GE Medical Systems Global Technology Company, LLC
    Inventors: Fengshun Tan, Weijun Shen, Yihe Hua, Liang Liu
  • Publication number: 20090289748
    Abstract: The object of the present invention is to provide a rare earth magnet which enables to achieve a good balance between high coercive force and high residual magnetic flux density, and its manufacturing method. The present invention provides a rare earth magnet in which a layered grain boundary phase is formed on a surface or a potion of a grain boundary of Nd2Fe14B which is a main phase of an R—Fe—B (R is a rare-earth element) based magnet, and wherein the grain boundary phase contains a fluoride compound, and wherein a thickness of the fluoride compound is 10 ?m or less, or a thickness of the fluoride compound is from 0.1 ?m to 10 ?m, and wherein the coverage of the fluoride compound over a main phase particle is 50% or more on average.
    Type: Application
    Filed: August 3, 2009
    Publication date: November 26, 2009
    Inventors: Makahiro KOMURO, Yuichi Satsu
  • Patent number: 7622038
    Abstract: Two assembled bodies arranged as a pair are disposed around the outside periphery of a pipe to activate water flowing in the pipe. Each of the assembled bodies is composed of a cover and fluid activating bodies integrally fixed in the cover with an epoxy resin. Each of the fluid activating bodies is composed of a black radiation sintered body made by sintering the powder of a plurality of kinds of metal oxides at high temperature and an electromagnetic wave converging body for converging the electromagnetic wave radiated from the black radiation sintered body to a predetermined wavelength. The two covers are disposed around the outside periphery of the pipe, and fixing portions formed on both the sides of the covers are integrally fixed by fixtures, respectively.
    Type: Grant
    Filed: September 1, 2005
    Date of Patent: November 24, 2009
    Assignee: Japan System Planning Co., Ltd.
    Inventor: Katsuyuki Kumano
  • Patent number: 7622046
    Abstract: A magnetic transfer method for sorting, collecting, transferring or dosing microparticles (22) or magnetic particles either in the same liquid (23) or from one liquid (23a) into another (23b) by using a magnetic field. The transfer device (10) comprises a magnet (13) placed inside a protective coating (21), and the collection or dozing is accomplished by changing the magnetic field of the magnet (13). The changing of the magnetic field is effected by using a ferromagnetic body, such as a plate or tube (12), comprised in the transfer device, in such manner that, when micro-particles are to be collected, the magnet is partially or completely outside the ferromagnetic body and, when the particles are to be released or dozed, the magnet is partially or completely inside or behind the ferromagnetic body.
    Type: Grant
    Filed: October 20, 2003
    Date of Patent: November 24, 2009
    Assignee: BioControl Systems, Inc.
    Inventors: Kenneth Rundt, Matti Korpela
  • Publication number: 20090278644
    Abstract: A magnetic circuit unit includes a pole piece, a magnet, and a yoke and a suspension is made of a magnetic material, so that a magnetic gap is formed between an end portion of an inner circumferential side surface of the suspension and an end portion of the pole piece. Accordingly, it is possible to prevent the magnet in the magnetic circuit unit from being formed in a thin size. In addition, it is possible to implement a multi-function vibration actuator having a thin structure and capable of obtaining a sufficiently sensible vibration.
    Type: Application
    Filed: December 13, 2006
    Publication date: November 12, 2009
    Applicant: NAMIKI SEIMITSU HOUSEKI KABUSIKI KAISHA
    Inventors: Minoru Ueda, Shoichi Kaneda, Kenji Ueno
  • Publication number: 20090277268
    Abstract: [Means for Resolution] A magnetized body is a bonded magnet and is fixed to a support member by integral injection molding. A bend portion extending axially outwardly is formed in an outwardly-directed flange portion of the support member. A come-off preventing concave portion is constituted by the bend portion and the outwardly-directed flange portion. The magnetized body enters this concave portion. Consequently, the magnetized body is prevented from performing relative movement with respect to the support member.
    Type: Application
    Filed: November 1, 2007
    Publication date: November 12, 2009
    Inventor: Yasuhiko Ishii
  • Patent number: 7616983
    Abstract: A device for guiding a magnetic element has magnet holders that can be pivoted about vertical axes from an operating position to a rest position, such that a patient to be examined can be examined using imaging devices, having X-ray radiation sources and X-ray detectors respectively attached to C-arms.
    Type: Grant
    Filed: September 20, 2005
    Date of Patent: November 10, 2009
    Assignee: Siemens Aktiengesellschaft
    Inventors: Anton Nekovar, Hans-Joachim Reich
  • Publication number: 20090273421
    Abstract: The general field of the invention is that of spintronics, namely the field of electronics using the magnetic spin properties of electrons. The main fields of application are the very large-scale magnetic storage of information and the measurement of local magnetic fields. The object of the invention is to considerably reduce the energy needed to reverse the magnetic domains of the ferromagnetic elements of submicron dimensions using the mechanism of the domain wall displacements that is induced either by just a current of spin-polarized carriers or by the combination of a current of spin-polarized carriers and a magnetic field, at least one of these being variable. This domain wall displacement results in a change of magnetic polarization in a specified switching zone. Several devices according to the invention are described that possess from one switching zone up to a plurality of switching zones according to the invention.
    Type: Application
    Filed: December 14, 2005
    Publication date: November 5, 2009
    Applicant: THALES
    Inventors: Vincent Cros, Julie Grollier, Manuel Munoz Sanchez, Albert Fert, Frederic Nguyen Van Dau
  • Publication number: 20090261932
    Abstract: Disclosed herein is a two-component structural adhesive based on organic compounds containing radically polymerizable multiple bonds, in particular substituted acrylates and/or methacrylates, which on account of their lack of acids are particularly suited for adhering rare earth permanent magnets based on neodymium-iron-boron.
    Type: Application
    Filed: April 14, 2009
    Publication date: October 22, 2009
    Applicant: Vacuumschmelze GmbH & Co. KG
    Inventor: Lothar Zapf
  • Patent number: 7602268
    Abstract: An operation input device includes a base, a printed circuit board which has a plurality of pushbutton switches and Hall elements mounted on its upside and which is stacked on and united with the base, an operation plate which is supported on the base so as to be vertically movable on the printed circuit board, and a disc type operation dial in which an annular magnet with N-poles and S-poles arranged alternately is assembled on the underside of this operation dial and which is turnably assembled on the upside of the operation plate. Here, the disc type operation dial is turned, thereby to sense the changes of the magnetic fluxes of the annular magnet by the Hall elements and to detect a turning direction, while the disc type operation dial is depressed, thereby to operate any of the pushbutton switches through the operation plate. The operation dial is prevented from becoming rickety in a horizontal direction, and it ensures a smooth turning operation, thereby to afford a good operation feeling.
    Type: Grant
    Filed: April 3, 2006
    Date of Patent: October 13, 2009
    Assignee: OMRON Corporation
    Inventors: Takeshi Miyasaka, Kazuaki Miyoshi
  • Publication number: 20090251248
    Abstract: An improved field emission system and method is provided that involves field emission structures having electric or magnetic field sources. The magnitudes, polarities, and positions of the magnetic or electric field sources are configured to have desirable correlation properties, which may be in accordance with a code. The correlation properties correspond to a desired spatial force function where spatial forces between field emission structures correspond to relative alignment, separation distance, and the spatial force function.
    Type: Application
    Filed: September 30, 2008
    Publication date: October 8, 2009
    Applicant: CEDAR RIDGE RESEARCH LLC
    Inventors: Larry W. Fullerton, Mark D. Roberts
  • Publication number: 20090243775
    Abstract: The present invention relates to a magnet having a linear magnetic flux density, which causes the magnetic flux density thereof to vary linearly and, more particularly, to a magnet having a linear magnetic flux density, in which the shape and magnetization pattern of the magnet are changed so that displacement in proportion to linearly varying displacement from the magnet is more accurately measured using a magnetic flux sensor, thus causing the magnetic flux density to vary linearly (or rectilinearly) according to the displacement. The present invention is configured to have a rectangular shape or a trapezoid shape so that displacement in proportion to linearly varying displacement from the magnet is more accurately measured using a magnetic flux sensor, and is configured such that the value of magnetic flux density varies linearly (rectilinearly) according to the magnetization pattern of the rectangular shape or a trapezoid shape.
    Type: Application
    Filed: January 3, 2007
    Publication date: October 1, 2009
    Applicant: KYUNGDONG NETWORK CO., LTD.
    Inventor: Si-Hwan Kim
  • Patent number: 7592889
    Abstract: To realize an anisotropic bonded magnet that reduces cogging torque without lowering output torque. The present invention provides a hollow cylindrically shaped anisotropic bonded magnet for use in a 4-pole motor, formed by molding anisotropic rare-earth magnet powder with resin. The alignment distribution of the anisotropic rare-earth magnet powder in a cross section perpendicular to the axis of the anisotropic bonded magnet is in the normalized direction of the cylindrical side of the hollow cylindrical shape in the main region of a polar period, and in a transition region in which the direction of the magnetic pole changes, steadily points towards a direction tangential to the periphery of the cylindrical side at points closer to the neutral point of the magnetic pole, and becomes a direction tangential to the periphery of the cylindrical side at that neutral point, and steadily points toward the normalized direction of the cylindrical side at points farther away from the neutral point.
    Type: Grant
    Filed: April 20, 2005
    Date of Patent: September 22, 2009
    Assignee: Aichi Steel Corporation
    Inventors: Yoshinobu Honkura, Hiroshi Matsuoka, Masahiko Kato, Daisuke Nagaya
  • Publication number: 20090212893
    Abstract: A corrosion resistant rare earth magnet is obtained by (i) applying a treating liquid comprising a flaky fine powder and a metal sol to a surface of R-T-M-B rare earth permanent magnet and then heating to form a composite film of flaky fine powder/metal oxide on the magnet surface; (ii) applying a treating liquid comprising a flaky fine powder and a silane and/or a partial hydrolyzate thereof to a surface of R-T-M-B rare earth permanent magnet and then heating a flaky fine powder/silane and/or partially hydrolyzed silane coating to form a composite film on the magnet surface; or (iii) applying a treating liquid comprising a flaky fine powder and an alkali silicate to a surface of R-T-M-B rare earth permanent magnet and then heating to form a composite film of flaky fine powder/alkali silicate glass on the magnet surface.
    Type: Application
    Filed: April 23, 2009
    Publication date: August 27, 2009
    Applicant: SHIN - ETSU CHEMICAL CO. , LTD.
    Inventors: Ryuji HAMADA, Takehisa MINOWA
  • Publication number: 20090206973
    Abstract: The present invention provides a bond magnet for direct current reactor which is to be disposed in a gap formed in a magnetic core of a direct current rector, the bond magnet containing a magnet powder containing a rapidly quenched powder of a rare earth magnet alloy. The present invention also provides a direct current reactor including a magnetic core having a gap and a winding area wound around the magnetic core, in which the bond magnet is disposed in the gap of the magnetic core.
    Type: Application
    Filed: February 18, 2009
    Publication date: August 20, 2009
    Applicants: DAIDO TOKUSHUKO KABUSHIKI KAISHA, KURUTAKE ELECTRO-STEEL CO., LTD.
    Inventors: Takao Yabumi, Koji Tsuru
  • Publication number: 20090208038
    Abstract: A ribbon for a ribbon microphone having a magnet forming a magnetic gap, the ribbon which is arranged in the magnetic gap and is vibrated by a sound wave, an electrode for outputting an electric signal which is generated when the ribbon vibrates in the magnetic gap, and a frame for holding the magnet and the electrode; the ribbon has patterns of a large waveform which are formed so as to progress in a longitudinal direction of the ribbon and are formed so that ridge lines face a direction which perpendicularly crosses the longitudinal direction of the ribbon, and small patterns which are smaller than the patterns of the waveform and are formed along the longitudinal direction of the ribbon.
    Type: Application
    Filed: February 12, 2009
    Publication date: August 20, 2009
    Applicant: KABUSHIKI KAISHA AUDIO-TECHNICA
    Inventor: Hiroshi AKINO
  • Patent number: 7568566
    Abstract: A magnetic fastening system for connecting a first member against a second member. The system includes a first flexible magnet longitudinally associated with at least a portion of an edge of the first member and a second flexible magnet longitudinally associated with at least a portion of an edge of the second member. The first and second flexible magnets are aligned to attract one another as the first and second members are moved into their connected position to then pull the first and second members into connecting contact.
    Type: Grant
    Filed: November 22, 2006
    Date of Patent: August 4, 2009
    Inventor: Carlo D'Ambrosio
  • Publication number: 20090189470
    Abstract: A flux-focused, shaped permanent magnet includes a body of magnetic material having multiple surface contouring to form a reduced flux side with convex surfaces and an increased flux side with concave surfaces. The surfaces develop high and low resistance external flux paths creating focused asymmetric flux fields. A magnetic unit having the shaped permanent magnet and a magnetic flux attracter or two shaped permanent magnets interconnected by two segmented permanent magnets and a kinetic device having a stationary stator ring, a rotor disc rotating within the stator ring and a multiplicity of the magnetic units on the stator ring and the rotor disc, are also provided.
    Type: Application
    Filed: January 25, 2008
    Publication date: July 30, 2009
    Inventor: W. Thomas McClellan
  • Publication number: 20090184791
    Abstract: There is provided a molded body having high fixing strength between a magnetic mold material and an external electrode. The molded body uses the magnetic mold material comprising at least 65 vol % of magnetic powder and up to 35 vol % of resin and the external electrode that has pits and projections on a surface that makes contact with the magnetic mold material. The external electrode and the magnetic mold material are integrally-molded such that at least a portion of the external electrode is exposed at at least one surface of the molded body. Spacing between the pit and projection of the external electrode is smaller than the maximum particle size of the magnetic powder.
    Type: Application
    Filed: January 14, 2009
    Publication date: July 23, 2009
    Applicant: Toko, Inc.
    Inventor: Yoshizumi FUKUI
  • Patent number: 7564333
    Abstract: A magnetic separator with permanent magnets includes a ferromagnetic member (2) for the circuit connection between at least two magnetic poles (3C) made up of ferrite magnets (12) in the bottom portion in contact with said ferromagnetic member (2) for the circuit connection, and of rare earth magnets (13) in the top portion that represents the entrance/exit surface (14) of the magnetic flux lines (15, 16). The ratio between the effective magnetic length of the ferrite magnets (12) and of the rare earth magnets (13) is preferably 2:1, and the preferred materials are strontium ferrite for the former and iron-boron-neodymium for the latter. In this way it is possible to combine the magnetic characteristics of the two types of permanent magnets so as to make them complementary and thus enhance the attractive effectiveness of the separator both for ferromagnetic materials with high or low shape factor, and for materials with high or low and sometimes very low permeability.
    Type: Grant
    Filed: November 7, 2003
    Date of Patent: July 21, 2009
    Assignee: SGM Gantry S.p.A.
    Inventor: Danilo Molteni
  • Publication number: 20090179720
    Abstract: The present invention relates to a magnetic field adjusting device; such as may be used in MRI apparatus. The device can overcome the magnetic force to enable shimming plugs to move in a controlled continuous manner, thereby achieving continuous adjusting and accurate positioning. The magnetic field adjusting device comprises; a pair of opposing pole plates (3, 31), respectively mounted on magnetic field generating sources, forming a magnetic field space; a plurality of shimming plugs (42) movably mounted at the periphery of said pole plates (3, 31), each shimming plug (42) mounted in a radially oriented retaining groove (45), so as to be moveable in the direction of the retaining groove. Additionally, or alternatively, the circumferences of the magnetic field generating sources (5, 51) are arranged with adjusting bars (71, 81) which can move perpendicular to the pole plates.
    Type: Application
    Filed: January 5, 2009
    Publication date: July 16, 2009
    Applicant: Siemens Aktiengesellschaft
    Inventors: Cheng NI, Ting Qiang Xue, Jin Jun Chen
  • Patent number: 7559996
    Abstract: A rare earth permanent magnet is prepared from a sintered magnet body of a R1—Fe—B composition wherein R1 is a rare earth element inclusive of Y and Sc, by forming a plurality of slits in a surface of the magnet body, disposing a powder on the magnet body surface, the powder comprising an oxide of R2, a fluoride of R3, or an oxyfluoride of R4 wherein each of R2, R3, and R4 is a rare earth element, and heat treating the magnet body and the powder below the sintering temperature in vacuum or in an inert gas.
    Type: Grant
    Filed: July 20, 2006
    Date of Patent: July 14, 2009
    Assignee: Shin-Etsu Chemical Co., Ltd.
    Inventors: Koji Miyata, Koichi Hirota, Hajime Nakamura, Takehisa Minowa
  • Patent number: 7561015
    Abstract: A magnet encapsulated within a canister formed from two cans into a laminated structure particularly useful in plasma processing reactors. Each can includes an end wall and a cylindrical sidewall. One can additionally includes an annular lip that slidably fits outside the sidewall of the other can with a small gap therebetween. The magnet is inserted into the two cans together with a flowable and curable adhesive such as epoxy. The cans are slid together and compressed to cause the adhesive to flow between the magnet and the two cans and between the lip of one can and the sidewall of the other. The adhesive is cured to bond the magnet to the cans and to bond the cans together and to also hermetically seal the structure. The cans may be deep drawn from non-magnetic stainless steel with wall thicknesses of less than 0.064 mm.
    Type: Grant
    Filed: December 2, 2003
    Date of Patent: July 14, 2009
    Assignee: Applied Materials, Inc.
    Inventors: Anthony Vesci, Alan B. Liu, Donny Young, Joe F. Sommers, Kevin Hughes
  • Publication number: 20090175666
    Abstract: A magnetic field generating member with high stiffness and small size, an image development device, a process cartridge and an image forming apparatus including the magnetic field generating member as well as a manufacturing method of the magnetic field generating member are provided where the magnetic field generating member includes a main body, a groove provided in the main body, an interposition member configured to be fitted in the groove of the main body and including a concave portion and a magnetic member as a long magnetic compact fixed into the concave portion of the interposition member.
    Type: Application
    Filed: December 30, 2008
    Publication date: July 9, 2009
    Inventors: Yoshiyuki TAKANO, Kyohta Koetsuka, Noriyuki Kamiya, Masayuki Ohsawa, Mieko Terashima, Rei Suzuki, Hiroya Abe, Takashi Innami, Tadaaki Hattori
  • Patent number: 7557685
    Abstract: A cow magnet is provided having minerals that have been found useful for good health. A cow magnet of Ferrous Oxide (FeO) and stable Strontium (Sr) is discovered to be healthy. Stable Strontium (Sr) is discovered to be used by the bovine body to increase bone growth and strength. Iron (Fe) is known to be used by the bovine body for healthy red blood cells. The magnet is sintered to control the trace amounts of these elements released into the stomach. The polarity pattern is discovered for SrFe type magnets so that a nail will be held parallel to the length of the magnet and at the maximum strength. This pole pattern has been discovered to turn a nail parallel to the length of the magnet if the nail is placed on the magnet perpendicular to the length. This pole pattern also prevents a nail from being held along the length with the sharp tip sticking out past the end of the magnet. This prevents damage to the ruminator's first stomach. The strength is the same as the standard AlNiCo 5 magnets.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: July 7, 2009
    Inventor: John Nellessen
  • Patent number: 7551051
    Abstract: Radially oriented ring-shaped preliminarily molded pieces of a ring magnet are stacked in an axial direction to form a ring-shaped molded body, in which end faces of the ring-shaped preliminarily molded pieces are bonded together. This ring-shaped molded body is sintered and heat-treated to produce the ring magnet. Ring magnets which are less susceptible to deterioration of magnetic properties due to a disturbance of magnetic orientation near lamination boundary surfaces are produced. The invention provides a method of manufacturing such ring magnets with high efficiency.
    Type: Grant
    Filed: October 29, 2003
    Date of Patent: June 23, 2009
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yoshikazu Ugai, Taizo Iwami, Shuichi Takahama, Yuji Nakahara, Jinichi Furukawa
  • Publication number: 20090146518
    Abstract: A hollow cylindrically shaped anisotropic bonded magnet for use in a 4-pole motor, is formed by molding anisotropic rare-earth magnet powder with resin. The alignment distribution of the anisotropic rare-earth magnet powder in a cross section perpendicular to the axis of the anisotropic bonded magnet is in the normalized direction of the cylindrical side of the hollow cylindrical shape in the main region of a polar period, and in a transition region in which the direction of the magnetic pole changes, steadily points towards a direction tangential to the periphery of the cylindrical side at points closer to the neutral point of the magnetic pole, and becomes a direction tangential to the periphery of the cylindrical side at that neutral point, and steadily points toward the normalized direction of the cylindrical side at points farther away from the neutral point.
    Type: Application
    Filed: February 2, 2009
    Publication date: June 11, 2009
    Applicant: AICHI STEEL CORPORATION
    Inventors: Yoshinobu Honkura, Hiroshi Matsuoka, Masahiko Kato, Daisuke Nagaya
  • Publication number: 20090146767
    Abstract: Featured is a magnetic ring structure including at least a vortex magnetic state such as symmetrically and asymmetrically shaped nanorings, having small diameters (e.g., on the order of 100 nm). In particular embodiments, the width and thickness of the asymmetrical nanorings varies as a function of the locations on the circumference so that maxima and minima thereof are located on opposite sides of the nanoring. Also featured are methods for fabricating such symmetrically and asymmetrically shaped nanorings. Also featured are methods for controlling the reversal process so as to thereby create vortex states in such asymmetric nanorings by controlling the field angle.
    Type: Application
    Filed: March 14, 2006
    Publication date: June 11, 2009
    Applicant: The Johns Hopkins University
    Inventors: Frank Q. Zhu, Chia-Ling Chien
  • Patent number: 7535329
    Abstract: A magnet structure or instrument for spectroscopy including a plurality of magnetic flux sources disposed along a common axis. The plurality of permanent magnetic flux sources include a first magnet flux source having a first through-hole body, and include second and third magnet flux sources located respectively on opposite sides of the first magnet flux source, with at least one of the second and third magnet flux sources having a side through-hole body. Magnetic flux within the first magnet flux source is oriented to generate a first magnetic field directed along the common axis. Respective magnetic fluxes within the second and third magnet flux sources are oriented to generate second and third magnetic fields directed along the common axis, with at least one field component of either the second or third magnetic fields along the common axis inside the respective second or third magnet flux sources opposed to a direction of the first magnetic field on said common axis inside the first magnet flux source.
    Type: Grant
    Filed: April 14, 2005
    Date of Patent: May 19, 2009
    Assignee: Makrochem, Ltd.
    Inventor: Mikhail V. Gorshkov
  • Publication number: 20090108970
    Abstract: A process for production of a magnet which comprises step of supplying a slurry S containing magnetic powder and a dispersing medium into the cavity C of a molding apparatus 12, a step of compression molding the slurry S while applying a magnetic field to the slurry S to obtain a molded article and a step of sintering the molded article to obtain a magnet, wherein the molding apparatus 12 comprises a die 121 having a through-hole 121a into which the slurry S is supplied, a slurry supply gate 121d being formed in the inner wall surface 121b, a die 122 inserted in the through-hole 121a and a die 123 that forms a cavity C together with the dies 123, 122, the slurry S being supplied in an amount such that it is less than the volume of the cavity C when the die 122 has been inserted in the through-hole 121a and has blocked the slurry supply gate 121d, and in the step of obtaining the molded article, the slurry S is compression molded after the die 122 has blocked the slurry supply gate 121d.
    Type: Application
    Filed: October 28, 2008
    Publication date: April 30, 2009
    Applicant: TDK Corporation
    Inventors: Kazunori OI, Seiichi ENDO, Kazuyuki SATOU, Masayuki OHTSUKA, Norihisa SAITO, Tsuneki WATANABE
  • Publication number: 20090096561
    Abstract: In order to achieve excellent heat resistance, durability and weatherability for use in an extended range of temperature environments, a rare earth bonded magnet is formed such that a material mixture comprising: a rare earth magnetic powder having a particle diameter ranging from 30 ?m to 500 ?m; a resin binder constituted by a thermosetting resin; and an organic phosphorous compound, is compression-molded and hardened, wherein the organic phosphorous compound is uniformly dispersed in the resin binder.
    Type: Application
    Filed: March 26, 2008
    Publication date: April 16, 2009
    Applicant: MINEBEA CO., LTD.
    Inventors: Noboru Menjo, Kinji Uchiyama, Yuki Takeda, Osamu Kobayashi
  • Patent number: 7518479
    Abstract: An inline electromagnetic tool actuator incorporates an actuator housing, an elongated armature, a tool assembly, spaced-apart return magnets, at least one drive magnet, and at least one magnet wire. The elongated armature is located inside the housing, and is adapted for reciprocating linear movement along a notional assembly axis. The tool assembly is operatively attached to the armature. The return magnets are located inside the housing, and are coaxially aligned with the armature. The return magnets have respective inward facing surfaces defining respective magnetic poles. The drive magnet is affixed to the armature, and is arranged between the return magnets. The drive magnet has opposing outward facing surfaces each of like polarity to adjacent inward facing surfaces of the return magnets. The magnet wire is coiled about the armature.
    Type: Grant
    Filed: August 31, 2006
    Date of Patent: April 14, 2009
    Inventors: Thomas Mask, Mark Evans
  • Publication number: 20090085700
    Abstract: A magnet primarily for use in MRI applications comprises a pair of poles oriented about a plane of symmetry parallel to each therebetween defining an air gap region, magnetic field sources secured on the surfaces of the poles opposite the air gap that have yokes disposed on them, the yokes connected to each other by returns so that the entire magnet assembly can form a closed magnetic flux circuit to substantially confine the magnetic fields generated by the apparatus in the air gap where an imaging region is formed to place subjects for the purposes of examination.
    Type: Application
    Filed: December 6, 2006
    Publication date: April 2, 2009
    Inventors: Jianyu Lian, Grum Teklemariam, Xiaoping Hu
  • Publication number: 20090078484
    Abstract: Magnetic circuit that has (a) a source of magnetic flux which includes an electromagnet or one or more permanent magnets, (b) at least two oppositely polarisable pole extension bodies associated with the magnetic flux source, the bodies being disc, wheel, roller or similarly shaped with an outer circumferential surface and held rotatable about respective axes of rotation, and (c) a ferromagnetic counter body which is arranged to cooperate with the pole extension bodies such as to provide an external flux path for the magnetic flux when in magnetic proximity or contact with the circumferential surface of the pole extension bodies, which is characterised in that the magnetic flux source is held stationary relative to the rotatable pole extension bodies.
    Type: Application
    Filed: March 6, 2007
    Publication date: March 26, 2009
    Applicant: MATSWITCH TECHNOLOGY WORLDWIDE PTY LTD
    Inventor: Franz Kocijan
  • Patent number: 7507136
    Abstract: A set of magnetic blocks by which connection is made between blocks through a force attracting multiple ferrous protrusions on one face to multiple recessed magnets on another face. The multiple points of magnetic connection provide alignment and rigidity to the assembled structure.
    Type: Grant
    Filed: December 8, 2006
    Date of Patent: March 24, 2009
    Inventor: Claire Jean Patton
  • Publication number: 20090072938
    Abstract: The present invention provides an R-T-B system alloy used as a raw material for a rare earth permanent magnet (wherein R represents at least one selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Ho, Er, Tm, Yb and Lu, T represents a transition metal comprising 80% or more by weight of Fe, and B represents a component comprising 50% or more by weight of B and between 0 to less than 50% by weight of at least one selected from the group consisting of C and N), wherein the content of Mn in the alloy is 0.05% or less by weight.
    Type: Application
    Filed: February 21, 2008
    Publication date: March 19, 2009
    Applicant: SHOWA DENKO K.K.
    Inventors: Kenichiro Nakajima, Hiroshi Hasegawa
  • Patent number: 7504921
    Abstract: An actuator for moving a load has a frame forming a race between two surfaces thereof, at least two elements joined together by at least one flexible member, the elements and the at least one flexible member being disposed between the two surfaces of the frame that forms a race, one of the elements further joined to the load by a portion of the at least one flexible member, wherein when an element comes into contact with a surface of the frame it will stick thereto absent a repelling force, and moving means disposed to selectively attract or repel a corresponding element towards or away from one or the other of the two surfaces of the frame that forms the race. The actuator effects movement of the load in a direction towards or away from the elements, by changing a position of at least one of the elements on a surface of the frame that forms the race.
    Type: Grant
    Filed: September 29, 2006
    Date of Patent: March 17, 2009
    Assignee: United States of America as represented by the Administrator of the National Aeronautics and Space Adminstration
    Inventor: John M. Vranish
  • Publication number: 20090067232
    Abstract: The present invention provides a low resistance high magnetoresistance (MR) device comprised of a junction of two magnetic elements separated by a magnesium oxide (MgO) layer doped with such metals as Al and Li. Such device can be used as a sensor of magnetic field in magnetic recording or as a storage element in magnetic random access memory (MRAM). The invention provides a high-MR device possessing a diode function, comprised of a double junction of two outer magnetic elements separated by two MgO insulating layer and a center MgO layer doped with such metals as Al and Li. Such device provides design advantages when used as a storage element in MRAM. The invention with MR wherein a gate electrode is placed in electrical or physical contact to the center layer of the double tunnel junction.
    Type: Application
    Filed: February 8, 2007
    Publication date: March 12, 2009
    Inventor: Vladislav Korenivski
  • Patent number: 7501922
    Abstract: A permanent magnetic male and female levitation support has a first part with a cavity and a plurality of retainment mechanisms incorporated therein, and a plurality of first permanent magnets evenly distributed around the perimeter of the cavity and held in place by the retainment mechanisms, wherein the first permanent magnets produce a first rotationally invariant magnetic field around a first axis. A second part is rigidly connected to a base and produces a second rotationally invariant magnetic field around a second axis. When the first axis is aligned with the second axis, the first magnetic field and the second magnetic field simultaneously produce a repulsive force and a restorative force to levitate the first part relative to the second part.
    Type: Grant
    Filed: March 1, 2007
    Date of Patent: March 10, 2009
    Inventor: Sanza T. Kazadi
  • Patent number: 7501921
    Abstract: A magnetic roller may comprise a magnetized outer surface and an internal chamber. A temperature control system may be in communication with the internal chamber, and a fluid capable of heat transfer may circulate within the internal chamber and the temperature control system. The magnetic roller may be used to produce magnetic sheets having magnetizable particles that are aligned according the a magnetic field generated by the magnetic roller. The magnetic sheet may be provided in a pliable form wherein magnetizable particles may shift orientation when exposed to the magnetic field. Heat may be transferred between the sheet and the magnetic roller to cause solidification of the magnetic material and prevent dealignment of the magnetic particles.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: March 10, 2009
    Assignee: MagnetNotes, Ltd.
    Inventors: Raymond S. Richards, Randall Boudouris
  • Publication number: 20090058750
    Abstract: A superior high-frequency magnetic material having a smaller ratio (??/??) of the real part ?? of permeability and the imaginary part ?? of permeability in a high-frequency region and an antenna device using thereof are provided. The high-frequency magnetic material includes a substrate and a composite magnetic film formed on the substrate that consists of a magnetic phase forming a plurality of columnar bodies whose longitudinal direction is directed in a direction perpendicular to a surface of the substrate and an insulator phase filling gaps of the columnar bodies, and the magnetic phase is amorphous and has in-plane uniaxial anisotropy of Hk2/Hk1?3 and Hk2?3.98×103 A/m when a minimal anisotropic magnetic field in a plane in parallel with the surface of the substrate is Hk1 and a maximal anisotropic magnetic field is Hk2.
    Type: Application
    Filed: July 16, 2008
    Publication date: March 5, 2009
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Tomoko EGUCHI, Maki Yonetsu, Naoyuki Nakagawa, Seiichi Suenaga