Patents Examined by Thomas J. Kozma
  • Patent number: 5610569
    Abstract: A co-fired inductor structure that includes a plurality of planar co-fired ceramic dielectric insulating layers (13); a plurality of elongated conductive strips (11-1-11-4, 12-1-12-4, 21-1-21-3, 22-1-22-3) arranged in four groups of parallel elongated conductive strips each group disposed on a respective dielectric insulating layer; and a plurality of via columns (101, 102, 103, 104) for interconnecting the ends of the elongated conductive strips such that the elongated conductive strips and the via columns form a winding.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: March 11, 1997
    Assignee: Hughes Electronics
    Inventors: William B. Hwang, David M. Lusher
  • Patent number: 5608371
    Abstract: A method of making a repairable transformer having an amorphous metal core. The three uncut legs of an annealed wound amorphous metal core are covered with an adhesive material while leaving the cut leg and both adjoining radii covered, but not bonded. The core joint is opened and coils are placed over the legs that adjoin the cut leg. The core joint is closed and the edges of the joint and both adjoining radii are covered with an inner layer of porous material which is secured by an outer wrap of electrical grade steel. The resulting transformer can be easily repaired by unwrapping away the porous material that covers the cut leg and the adjoining radii, opening the core joint, replacing a defective coil or core, reclosing the core joint, and rewrapping the porous material and reclosing the outer layer of electrical grade steel.
    Type: Grant
    Filed: January 31, 1996
    Date of Patent: March 4, 1997
    Assignee: ABB Power T&D Company, Inc.
    Inventors: Milan D. Valencic, Ram R. P. Sinha
  • Patent number: 5602519
    Abstract: A coupling device of synchronous cable for connecting a frequency of an induced voltage generated from a fly back transformer (FBT) is provided. The coupling device includes a metal support 53 formed with an accommodating groove 52 so as to be interposed with a shield metal 51 to a front wall surface of a case 50 of the FBT. Case 50 is provided with a ferrite core 60, and the ferrite core 60 is inserted and supported between the metal support 53. Shield metal 51 of the metal support 53 is connected with a synchronous cable 70 and grounded so as to draw out an induced voltage of the FBT. According to this design, not only a frequency of the induced voltage generated from the FBT is made to be stably drawn out, but also the coupling of the synchronous cable is automated whereby its workability and a productivity are improved.
    Type: Grant
    Filed: December 29, 1995
    Date of Patent: February 11, 1997
    Assignee: Samsung Electro-Mechanics Co., Ltd.
    Inventor: Myung H. Kim
  • Patent number: 5600294
    Abstract: An electromagnetic coil assembly includes a bobbin upon which a coil of magnet wire is wound. The bobbin includes a body having first and second flanges formed at the ends thereof. First and second circumferentially spaced slots are formed through the first flange which receive the start and finish ends of the coil. A pair of lead wires are connected to the respective ends of the coil of the magnet wire. The bobbin futher includes an extension which extends from the first flange. A circumferential lip is formed at the axial end of the extension having an outer periphery which is non-circular in shape. A cap is provided to having an end wall and a circumferential sidewall. An opening is formed through the end wall of the cap and preferably has an inner periphery of the same general shape as the outer periphery of the lip formed on the extension of the bobbin.
    Type: Grant
    Filed: December 27, 1994
    Date of Patent: February 4, 1997
    Assignee: Dana Corporation
    Inventors: Gary Buenconsejo, Keith A. Doehrman, Lee M. Stanley, Henry J. Waring
  • Patent number: 5598134
    Abstract: An electromagnetic power supplying apparatus for an electric motor vehicle includes a removable primary core and a secondary core. The primary core with a primary coil wound therearound is formed in the shape of a pillar having a reduced height. The secondary core with a secondary coil wound therearound is disposed on a vehicle body and has a cross-section formed in a letter "O" shape surrounding the primary core. When positioning the primary core within the secondary core, i.e., when fitting the primary core into the secondary core, there is formed a tripod type closed magnetic circuit core. The primary core is formed with only the center leg member of the tripod type closed magnetic circuit core, and accordingly it is remarkably light in weight relative to the secondary core. Further, when the secondary core is provided with a guide surface flush with one of the magnetic flux in-out end surfaces of the primary core, the primary and secondary cores are protected from breaking during the positioning.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: January 28, 1997
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventor: Makoto Ito
  • Patent number: 5592138
    Abstract: The device comprises a winding support (1) which is made of an electrically insulating material and which comprises a coil former (3), provided with a through-opening (9), and a core of a soft magnetic material which consists of two parts (15) and which comprises a limb (19) projecting through the opening of the coil former and a yoke (17) at least partly enclosing the winding support. The two core parts are attached to one another by means of a clamping bracket (21) which is made of a resilient material and which is formed as a closed ring. The construction of the clamping bracket (21) is very inexpensive and it can be very simply mounted on the assembly formed by the core (15) and the winding support (1) in that the clamping bracket consists of one piece of a resilient material which is shaped as a strip comprising barb-shaped free ends (23), which strip is bent so as to form a ring, the facing free ends engaging one another so that the ring is closed.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: January 7, 1997
    Assignee: U.S. Philips Corporation
    Inventor: Johannes H. Tobben
  • Patent number: 5589808
    Abstract: An encapsulated transformer includes a transformer coil assembly, a rigid core insert having an upstanding portion positioned within the hollow interior of the core and a base portion on which the core rests, and a thermoplastic rubber jacket that completely surrounds the transformer coil assembly and is bonded to the base portion of the core insert to provide a completely waterproof encapsulated transformer which is impervious to liquid and gasses that could be detrimental to the performance of the transformer. A method for producing such an encapsulated transformer includes placing a rigid core insert in a mold cavity of a mold, and positioning a transformer coil assembly in the mold cavity so that the transformer coil assembly rests on the core insert. Thermoplastic rubber is then injected into the mold cavity to completely encapsulate the transformer coil assembly in a jacket of thermoplastic rubber.
    Type: Grant
    Filed: August 12, 1994
    Date of Patent: December 31, 1996
    Assignee: Cooper Industries, Inc.
    Inventors: William A. Clark, Carl C. Strickland, Jr., Mark C. Newman
  • Patent number: 5587694
    Abstract: Two sets of a combination of an iron core formed of laminated strip-shaped electromagnetic steel plates and a coil are arranged in parallel, and these are abutted via core gap spacers against two iron cores formed of laminated trapezoidal electromagnetic steel plates, so that a square-shaped magnetic path is formed. Two outside iron cores of the four iron cores are coupled and fixed with metal fittings. With such an arrangement, the coil is divided into two, with increased surface areas of the coils and therefore an improved cooling characteristic. Further, since the electromagnetic steel plates used for the iron cores can be formed into simple shapes, electromagnetic steel plates of various sizes can be easily manufactured, so that iron cores of optimum dimensions can be provided, optionally depending on the type of the reactor.
    Type: Grant
    Filed: December 28, 1994
    Date of Patent: December 24, 1996
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Tetsuya Minato, Toshimitsu Yonehara, Junichi Teranishi, Shohei Toyoda, Toshiaki Bito, Kazushige Takashima
  • Patent number: 5585773
    Abstract: A plurality of transformers each comprised of a core, a primary winding, and a secondary winding are accommodated in one case, the transformers are incorporated in alternately different directions, high-tension terminals, to which output ends of the secondary winding are connected, are provided on a side opposite to the side where a core disposed outside the secondary winding is located, and a layer of a resin minimum for insulation is provided between adjacent ones of the secondary windings.
    Type: Grant
    Filed: March 21, 1994
    Date of Patent: December 17, 1996
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shigemi Murata, Mitsuru Koiwa, Yutaka Ohashi
  • Patent number: 5583474
    Abstract: Disclosed herein is a planar magnetic element comprising a substrate, a first magnetic layer arranged over the substrate, a first insulation layer arranged over the first magnetic layer, a planer coil formed of a conductor, having a plurality of turns, arranged over the first insulation layer and having a gap aspect ratio of at least 1, the gap aspect ratio being the ratio of the thickness of the conductor to the gap between any adjacent two of the turns, a second insulation layer arranged over the planar coil, and a second magnetic layer arranged over the second insulation layer. When used as an inductor, the planar magnetic element has a great quality coefficient Q. When used as a transformer, it has a large gain and a high voltage ratio. Since the element is small and thin, it is suitable for use in an integrated circuit, and can greatly contribute to miniaturization of electronic devices.
    Type: Grant
    Filed: May 25, 1994
    Date of Patent: December 10, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsuhiko Mizoguchi, Toshiro Sato, Masashi Sahashi, Michio Hasegawa, Hiroshi Tomita, Atsuhito Sawabe
  • Patent number: 5581224
    Abstract: A choke coil which functions not only to eliminate common mode noise but also to eliminate differential mode noise. A couple of coils are wound around a circular first core and a second core which is disposed inside the circular first core. The second core has a circular frame and a bridge which is laid in the frame. The first core may be easy to become magnetic saturation but is made of a material with a large magnetic permeability, and preferably a material with a relative magnetic permeability of several thousand, such as ferrite and amorphous. The second core is made of a material which is hard to become magnetic saturation, and preferably a material with a relative magnetic permeability of some scores to several hundred, such as dust core.
    Type: Grant
    Filed: October 13, 1995
    Date of Patent: December 3, 1996
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Kouichi Yamaguchi
  • Patent number: 5578981
    Abstract: A laminated inductor which is adopted in an electronic circuit. The laminated inductor has a plurality of coil sections which are composed by laminating insulating layers and coil conductors alternately. The two adjacent coil sections are staggered at least either in the vertical direction or in the horizontal direction.
    Type: Grant
    Filed: May 5, 1993
    Date of Patent: November 26, 1996
    Assignee: Murata Manufacturing Co., Ltd.
    Inventor: Hiromichi Tokuda
  • Patent number: 5574419
    Abstract: A method for bringing a predetermined turn of a coil located inside the width of the coil and beneath at least one layer of the coil and a coil made by such method.
    Type: Grant
    Filed: April 11, 1994
    Date of Patent: November 12, 1996
    Assignee: Philips Electronics North America Corporation
    Inventor: Joseph S. Droho
  • Patent number: 5574420
    Abstract: In accordance with the invention, a variety of magnetic devices can be made up of two or more low-profile surface components on a printed circuit board. For example, low profile devices comparable to gapped U-core pair and gapped E-core pair inductors or transformers can be formed of two and three components, respectively, and four components can be assembled into a gapped toroidal transformer or inductor. The components can be made in form for both linear and non-linear inductors.
    Type: Grant
    Filed: May 27, 1994
    Date of Patent: November 12, 1996
    Assignee: Lucent Technologies Inc.
    Inventors: Apurba Roy, Steven A. Shewmake, James C. Wadlington
  • Patent number: 5570074
    Abstract: A transformer having a very low, predetermined leakage inductance includes an elongate dielectric laminate having two surfaces. A primary winding having a pattern conformal to the configuration of the laminate is disposed on one surface and extends substantially the length of the laminate. The laminate has at least one secondary winding disposed on its other surface. The laminate is rolled with a dielectric layer about a cylinder, and the primary and secondary windings are patterned such that the primary and secondary windings comprise interleaved winding layers with the dielectric layer disposed between each of the winding layers. The rolled laminate, dielectric layer, and windings are contained within a cylindrical magnetic pot core. The result is a transformer having tightly interleaved primary and secondary windings and, therefore, a very low leakage inductance.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: October 29, 1996
    Assignee: General Electric Company
    Inventors: Robert L. Steigerwald, Alexander J. Yerman, Waseem A. Roshen
  • Patent number: 5570075
    Abstract: A coil former with injection-molded encapsulation has a top fitting in which coil wire guides for guiding a coil wire are formed. By virtue of the specific shape and arrangement of the coil wire guides, it is ensured, in particular together with a special design of the housing which surrounds the coil former, that the coil wire is only stressed in its longitudinal direction. As a result, damage or preliminary damage of the coil wire is prevented and reliability is increased.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: October 29, 1996
    Assignee: Robert Bosch GmbH
    Inventors: Erwin Krimmer, Richard Lorenz, Tilman Miehle, Steffen Schumacher
  • Patent number: 5568111
    Abstract: A common mode choke has a generally rectangular ferrite body for surface mounting on a printed circuit board. First and second spaced apart slotted openings extend vertically between the top face and the bottom face of the ferrite body. At least one pair of electrical conductors extend along parallel paths from the bottom face through the first slotted opening to the top face, along a portion of the top face, and back down through the second slotted opening to the bottom face. One pair of opposing side faces preferably has lower portions extending outwardly past a plane of the bottom face to thereby serve as a support to mount the bottom face of the ferrite body in spaced relation from the circuit board. The electrical conductors may then extend outwardly from the bottom face of the ferrite body for electrical connection through corresponding openings of a circuit board or extend laterally outwardly for electrical connection to corresponding portions of the circuit board in a gull wing configuration.
    Type: Grant
    Filed: May 1, 1995
    Date of Patent: October 22, 1996
    Assignee: Steward, Inc.
    Inventor: Alexander Metsler
  • Patent number: 5563569
    Abstract: A high voltage step-up transformer incorporating dual insulating layers, a relatively thick, heat-resistant "TEFLON" layer exhibiting extremely low dielectric losses and a thinner epoxy layer having a tractive, non-skid outer surface supporting a large plurality of fine wire secondary winding turns.
    Type: Grant
    Filed: April 13, 1994
    Date of Patent: October 8, 1996
    Assignee: Thermo Trex Corporation
    Inventors: Anthony J. Pellegrino, Donald E. Sharpe
  • Patent number: 5561410
    Abstract: Insulating flexible sheets and electroconductive flexible sheets having electroconductive patterns are stacked alternately into a multi-layer structure to form a laminated body. The inclining directions of the obliquely formed electroconductive patterns are varied alternately from layer to layer, and the patterns of different layers are electrically connected by electro-conductive connecting parts formed on the insulating sheets. A pattern of a single line wound in the same direction is formed by rounding the laminated body so as to connect the patterns to each other and thereby form a cylindrical multi-layer coil. Further, by opening the connecting part to make it a tapping part and reducing the number of turns of the multi-layer coil, the inductance of the coil can be set as desired.
    Type: Grant
    Filed: December 6, 1994
    Date of Patent: October 1, 1996
    Assignee: NEC Corporation
    Inventor: Nozomi Toki
  • Patent number: 5559486
    Abstract: Disclosed a high-frequency core bobbin which comprises: a winding bobbin member on which a wingding is to be wound; a first bobbin member for accommodating therein a predetermined portion of the winding bobbin; a second bobbin member coupled with the first bobbin coaxially so as to cover a portion of the winding bobbin member exposed from the first bobbin member, or put on the first bobbin member in the axial direction so as to shut off a space portion of a portion opposite to the winding bobbin member; and a leading-out guide provided on the second bobbin member for insertion and leading-out of lead wires of the winding.
    Type: Grant
    Filed: April 17, 1995
    Date of Patent: September 24, 1996
    Assignees: Tohoku Ricoh Co., Ltd., Tsuneo Ikenoue
    Inventors: Tsuneo Ikenoue, Hisahiro Kamata