Patents Assigned to Aichi Steel Corporation
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Publication number: 20060038561Abstract: A magnetic sensor includes a magnetic sensitive member 11 including an amorphous wire, a detection coil 12 wound around the magnetic sensitive member 11, and a sample-and-hold circuit for detecting a voltage induced in the amorphous wire 11 when a pulse current is interrupted. The sample-and-hold circuit has a sample-and-hold unit B31 and a delay circuit. The sample-and-hold unit B31 includes an electronic switch S31, a capacitor C32, a resistor R32, a resistor R33, and a high-input amplifier A31. The delay circuit includes a resistor R31 connected to a control terminal of the electronic switch S31 and a capacitor C31.Type: ApplicationFiled: August 18, 2004Publication date: February 23, 2006Applicant: Aichi Steel CorporationInventors: Yoshinobu Honkura, Michiharu Yamamoto, Yoshiaki Koutani, Kazumasa Sumi, Masaki Mori
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Publication number: 20050242805Abstract: A three-dimensional magnetic bearing sensor 10a includes a first sensor 101, a second sensor 102, and a third sensor 103 each constituted by a magneto-impedance sensor element 10 comprising a magnetic sensitive member 2 having a characteristic changed responsive to an external magnetic field, an insulator 4 formed to allow penetration of the magnetic sensitive member 2 therethrough, and an electromagnetic coil 3 made up of foil-like conductive patterns 31, 32 arranged in adjacent relation on an outer surface of the insulator 4. The first sensor 101, the second sensor 102, and the third sensor 103 are disposed such that directions in which the magnetic sensitive members 2 in respective sensors have maximum magnetic field detection sensitivities are substantially orthogonal to each other.Type: ApplicationFiled: July 13, 2004Publication date: November 3, 2005Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Michiharu Yamamoto, Kouei Genba
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Patent number: 6955729Abstract: An alloy for bonded magnets of the present invention includes at least a main component of iron (Fe), 12-16 atomic % (at %) of rare-earth elements (R) including yttrium (Y), and 10.8-15 at % of boron (B), and is subjected to a hydrogen treatment method as HDDR process or d-HDDR process. Using the magnet powder obtained from carrying out d-HDDR processing, etc. on this magnet alloy, pellets with superior insertion characteristics into bonded magnet molding dies can be obtained, and bonded magnets with superior magnetic properties and showing low cost can be obtained.Type: GrantFiled: June 28, 2002Date of Patent: October 18, 2005Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Norihiko Hamada, Chisato Mishima
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Patent number: 6932607Abstract: The aim of the present invention is to offer a keeper for a dental magnetic attachment that is strong, has low manufacturing costs, and is not easily detached from the tooth root. The keeper proposed herein has a keeper body, which is shaped like a plate, and a root, which is attached to the bottom of the keeper body. The keeper body and the root are machined from a single piece of soft magnetic material in one piece. The root has a smaller diameter part that is linked to a larger diameter part whose external diameter is larger than an external diameter of the smaller diameter part. The smaller diameter part is linked to the bottom of the keeper. There are multiple circumferential grooves around the outer side of the larger diameter part.Type: GrantFiled: March 24, 2003Date of Patent: August 23, 2005Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Kazuo Arai, Aki Watarai, Yasuhiro Takeuchi
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Patent number: 6917132Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: GrantFiled: December 10, 2002Date of Patent: July 12, 2005Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai
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Publication number: 20050145301Abstract: The bonded magnet of the present invention, in which average particle diameter and compounding ratio are specified, is comprised of R1FeB coarse powder that has been surface coated with surfactant, R2Fe(N, B) fine powder that has been surface coated with surfactant (R1 and R2 are rare-earth elements), and a resin which is a binder. Because the outside of R1FeB coarse powder is enveloped by resin in which R2Fe(N, B) fine powder is evenly dispersed, the R2Fe(N, B) fine powder and resin become a cushion and the R1FeB coarse powder does not deteriorate. As a result, the R1FeB coarse powder exhibits intrinsically excellent magnetic properties, and a bonded magnet with excellent magnetic properties and permanent flux loss ratio is obtained.Type: ApplicationFiled: April 9, 2003Publication date: July 7, 2005Applicant: AICHI STEEL CORPORATIONInventor: Yoshinobu Honkura
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Publication number: 20050076974Abstract: The bonded magnet of the present invention, in which average particle diameter and compounding ratio are specified, is comprised of Cobalt-less R1 d-HDDR coarse magnet powder that has been surface coated with surfactant, R2 fine magnet powder that has been surface coated with surfactant (R1 and R2 are rare-earth metals), and a resin which is a binder. The resin, a ferromagnetic buffer in which R2 fine magnet powder is uniformly dispersed, envelops the outside of the Cobalt-less R1 d-HDDR coarse magnet powder. Despite using Cobalt-less R1 d-HDDR anisotropic magnet powder, which is susceptible to fracturing and therefore vulnerable to oxidation, the bonded magnet of the present invention exhibits high magnetic properties along with extraordinary heat resistance.Type: ApplicationFiled: November 18, 2003Publication date: April 14, 2005Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Norihiko Hamada, Hironari Mitarai, Kenji Noguchi
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Publication number: 20040201300Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: ApplicationFiled: April 30, 2004Publication date: October 14, 2004Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai
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Publication number: 20040063072Abstract: The aim of the present invention is to offer a keeper for a dental magnetic attachment that is strong, has low manufacturing costs, and is not easily detached from the tooth root. The keeper proposed herein has a keeper body, which is shaped like a plate, and a root, which is attached to the bottom of the keeper body. The keeper body and the root are machined from a single piece of soft magnetic material in one piece. The root has a smaller diameter part that is linked to a larger diameter part whose external diameter is larger than an external diameter of the smaller diameter part. The smaller diameter part is linked to the bottom of the keeper. There are multiple circumferential grooves around the outer side of the larger diameter part.Type: ApplicationFiled: March 24, 2003Publication date: April 1, 2004Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Kazuo Arai, Aki Watarai, Yasuhiro Takeuchi
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Patent number: 6709533Abstract: This invention aims to provide a manufacturing method of an anisotropic magnet powder from which a bonded magnet with an improved loss of magnetization due to structural changes can be achieved. This is achieved by employing a low-temperature hydrogenation process, high-temperature hydrogenation process and the first evacuation process to an RFeB material (R: rare earth element) to manufacture a hydride powder (RFeBHx); the obtained RFeBHx powder (the precursory anisotropic magnet powder) is subsequently blended with a diffusion powder composed of hydride of dysprosium or the like and a diffusion heat-treatment process and a dehydrogenation process are employed. Through this series of processes, an anisotropic magnet powder with a great coercivity and a great degree of anisotropy can be achieved.Type: GrantFiled: September 19, 2001Date of Patent: March 23, 2004Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Norihiko Hamada, Chisato Mishima
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Patent number: 6709270Abstract: A dental attachment is disclosed which provides an improved connection force and fitting between an implant and a keeper. A keeper has a main body with a attracted face, a screw part that is located at the back face, a conical tapered shaft, and a projecting ring part. The projecting ring part has an inclining inner face and an acute angle pointed end. An implant has a screw hole part, a conical tapered hole part which has about the same inclining angle of the tapered axle part, and an inclining end face. When the keeper and the implant are connected, the tapered shaft and the tapered hole part are fitted closely and at the same time, the inner face of the acute angle pointed end and the inclining end part are in contact and at least the acute angle pointed end of the projecting ring part is elastically transformed toward the diameter.Type: GrantFiled: June 6, 2002Date of Patent: March 23, 2004Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Kazuo Arai, Yasuhiro Takeuchi
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Patent number: 6666930Abstract: The present invention offers a minute-sized magnet with superior magnetic energy product (BH)max and coercivity iHc, as well as superior anti-corrosive properties. This magnet is comprised of an alloy comprised of 35-55 atomic % platinum, 0.001-10 atomic % third element, which is one or more elements from groups IVa, Va, IIIb, or IVb, and a remainder of iron and other unavoidable impurities. The average crystal size of this FePt alloy is 0.3 &mgr;m. By mixing an FePt alloy with a specific element in a designated ratio, an FePt magnet with more excellent characteristics than ones made from previous alloys was successfully made.Type: GrantFiled: March 4, 2002Date of Patent: December 23, 2003Assignee: Aichi Steel CorporationInventors: Hitoshi Aoyama, Yoshinobu Honkura, Takumi Asano
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Patent number: 6659771Abstract: A dental attachment including a magnetic apparatus with magnetic attractive force, and a keeper that is attracted by the magnetic apparatus. The keeper has a convex shaped part with an attractive surface, and an end face provided around and protruding from the convex shaped part. The magnetic apparatus has a permanent magnet. The magnetic apparatus includes a magnetic assembly with an attractive surface and a non-magnetic guide ring made of non-magnetic material around the magnetic assembly. The non-magnetic guide ring has an end face. The non-magnetic guide ring and the attractive surface of the magnetic assembly form a concave part that receives the convex part of the keeper, and the end face of the keeper faces the end face of the non-magnetic guide ring.Type: GrantFiled: November 9, 2001Date of Patent: December 9, 2003Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Kazuo Arai
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Patent number: 6652278Abstract: The present invention is a bar type dental attachment for implants that makes use of magnetic attractive force to secure a denture in place. This bar type dental attachment can rotate corresponding to the movement of the denture during occlusion. The present invention has excellent wear resistance and makes insertion and removal of the denture easy. The present invention has a bar type keeper with an arced attractive face with a constant radius of curvature, and a magnetic assembly that comprises a magnet, a pair of yoke plates sandwiching the magnet, and a seal material made of anticorrosive non-magnetic material that covers the magnet and is hermetically sealed. The attractive surface of the magnetic assembly is curved to fit the keeper.Type: GrantFiled: September 19, 2001Date of Patent: November 25, 2003Assignee: Aichi Steel CorporationInventors: Yoshinobu Honkura, Kazuo Arai
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Publication number: 20030209294Abstract: An alloy for bonded magnets of the present invention includes at least a main component of iron (Fe), 12-16 atomic % (at %) of rare-earth elements (R) including yttrium (Y), and 10.8-15 at % of boron (B), and is subjected to a hydrogen treatment method as HDDR process or d-HDDR process.Type: ApplicationFiled: January 27, 2003Publication date: November 13, 2003Applicant: Aichi Steel CorporationInventors: Yoshinobu Honkura, Norihiko Hamada, Chisato Mishima
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Publication number: 20030124491Abstract: A dental attachment has been invented whose connection force and fitting between an implant and a keeper are improved. A keeper 3 has a main body 10 with a attracted face 31, a screw part 33 that is located at the back face, a conic taper shaft 35, and a projecting ring part 37. The projecting ring part 37 has an inclining inner face 371 and an acute angle pointed end 375. An implant 10 has a screw hole part 13, a conic taper hole part 15 which has about the same inclining angle of the taper axle part 35, and inclining end face 17. When the keeper 3 and the implant 10 are connected, the taper shaft 35 and the taper hole part 15 are fitted closely and at the same time, the inner face 371 of the acute angle pointed end 375 and the inclining end part 17 touch and at least the acute angle pointed end 375 of the projecting ring part 37 is elastically transformed toward the diameter.Type: ApplicationFiled: June 6, 2002Publication date: July 3, 2003Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Kazuo Arai, Yasuhiro Takeuchi
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Publication number: 20030118969Abstract: A dental magnetic attachment has been invented that can improve durability by preventing the wear of an attractive face and attracted face. The dental magnetic attachment 1 comprises a keeper 3 embedded in a tooth root 50, and a magnetic assembly 4 that attracts the keeper 3 by magnetic attract force. The magnetic assembly 4 has a yolk 42 that comprises a base part 421 and a lateral wall part 422, a permanent magnet 41, a soft-magnetic shield 43 and non-magnetic seal 44. The attractive face 401 of the magnetic assembly 4 and the attracted face 301 of the keeper 3 are coated by the wear-resistant film 6 with greater than 400 Hv of Vickers hardness.Type: ApplicationFiled: May 1, 2002Publication date: June 26, 2003Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Kazuo Arai
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Publication number: 20030111921Abstract: The challenge to be solved by the present invention is the miniaturization of a 1-300 W class of motor. This can be achieved by using a hollow-cylinder shaped anisotropic bonded magnet magnetized in a 4-pole configuration. The anisotropic bonded magnet has a maximum energy product approximately 4 times greater than the conventional sintered ferrite magnets. The use of a 4-pole configuration shortens the magnetic path length of the individual magnetic circuits and the magnetic force contributing to the torque is increased. When the torque is kept the same as in the conventional motor, the length of the electromagnetic rotor core and the axial magnet length can be reduced. In this fashion, 1-300 W class motors can be reduced in size.Type: ApplicationFiled: December 10, 2002Publication date: June 19, 2003Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Yoji Hashimoto, Hironari Mitarai
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Publication number: 20030047240Abstract: This invention aims to provide a manufacturing method of an anisotropic magnet powder from which a bonded magnet with an improved loss of magnetization due to structural changes can be achieved. This is achieved by employing a low-temperature hydrogenation process, high-temperature hydrogenation process and the first evacuation process to an RFeB material (R: rare earth element) to manufacture a hydride powder (RFeBHx); the obtained RFeBHx powder (the precursory anisotropic magnet powder) is subsequently blended with a diffusion powder composed of hydride of dysprosium or the like and a diffusion heat-treatment process and a dehydrogenation process are employed. Through this series of processes, an anisotropic magnet powder with a great coercivity and a great degree of anisotropy can be achieved.Type: ApplicationFiled: August 27, 2002Publication date: March 13, 2003Applicant: AICHI STEEL CORPORATIONInventors: Yoshinobu Honkura, Norihiko Hamada, Chisato Mishima
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Publication number: 20020153066Abstract: The present invention offers a minute-sized magnet with superior magnetic energy product (BH)max and coercivity iHc, as well as superior anti-corrosive properties. This magnet is comprised of an alloy comprised of 35-55 atomic % platinum, 0.0 01-10 atomic % third element, which is one or more elements from groups IVa, Va, IIIb, or IVb, and a remainder of iron and other unavoidable impurities. The average crystal size of this FePt alloy is 0.3 &mgr;m. By mixing an FePt alloy with a specific element in a designated ratio, an FePt magnet with more excellent characteristics than ones made from previous alloys was successfully made.Type: ApplicationFiled: March 4, 2002Publication date: October 24, 2002Applicant: AICHI STEEL CORPORATIONInventors: Hitoshi Aoyama, Yoshinobu Honkura, Takumi Asano