Patents by Inventor Hiromichi Tokuda

Hiromichi Tokuda has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6498553
    Abstract: A small-sized laminated inductor made via a simple firing process includes insulating magnetic sheets made of high permeability materials in which first coil conductors are provided on the surfaces thereof, insulating magnetic sheets made of low permeability materials in which second coil conductors are provided on the surfaces thereof, and other suitable materials. The first and second coil conductors are electrically connected in series through via holes provided in the magnetic sheets to define a spiral coil. In the spiral coil, the first coil conductors are wound in the counter-clockwise direction, while the second coil conductors are wound in the clockwise direction.
    Type: Grant
    Filed: August 21, 2000
    Date of Patent: December 24, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Tadashi Tanaka, Hiromichi Tokuda
  • Patent number: 6466120
    Abstract: A laminated inductor includes a sintered ceramic body made of a ceramic material and a coil conductor disposed inside of the ceramic body. The coil conductor has a plurality of conductor patterns and via-hole electrodes electrically connecting the conductor patterns which are located at different vertical positions in the ceramic body. A low dielectric constant material layer having a lower dielectric constant than that of the ceramic material of the sintered ceramic body is interposed between adjacent conductor patterns.
    Type: Grant
    Filed: October 5, 2000
    Date of Patent: October 15, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
  • Publication number: 20020144765
    Abstract: A method of manufacturing a laminated ceramic electronic component includes the steps of forming a conductor having a large thickness, which includes a plurality of first coil conductor layers and a plurality of second conductor layers, transferring the plurality of first coil conductor layers, which are each provided on a carrier film, onto the upper surface of a ceramic green sheet, and transferring the plurality of second coil conductor layers, which are each held on a carrier film, onto the lower surface of the same ceramic green sheet.
    Type: Application
    Filed: February 20, 2002
    Publication date: October 10, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Tsuyoshi Tatsukawa, Hiromichi Tokuda
  • Publication number: 20020140539
    Abstract: In a laminated impedance device, coil conductor patterns are electrically connected in series through via-holes to form a substantially U-shaped spiral coil. A first group of the coil conductor patterns defines a first coil portion of a high-permeability coil unit. A second group of the coil conductor patterns defines a second coil portion of a low-permeability coil unit, and a third group of the coil conductor patterns defines a third coil portion of the low-permeability coil unit. A fourth group of the coil conductor patterns defines a fourth coil portion of the high-permeability coil unit. The first, second and third coil portions are wound clockwise, while the fourth coil portion is wound counterclockwise, as viewed from the top of the impedance device. Therefore, the laminated impedance device yields a high inductance in the low-permeability coil unit, and can be mounted in any direction and orientation.
    Type: Application
    Filed: January 18, 2002
    Publication date: October 3, 2002
    Inventors: Koichi Takashima, Hiromichi Tokuda
  • Publication number: 20020121957
    Abstract: A multilayer impedance component which has no directivity when mounted and which achieves outstanding electrical characteristics includes a high permeability coil having a first winding portion and a third winding portion defined by stacking relatively high permeability magnetic sheets, a low permeability coil having a second winding portion defined by stacking relatively low permeability magnetic sheets, and an intermediate layer defined by an intermediate sheet. The three winding portions are electrically connected in series with each other to define a helical coil. Each end of the helical coil is led from coil conductor patterns provided in the high-permeability coil to each of input and output external electrodes.
    Type: Application
    Filed: February 19, 2002
    Publication date: September 5, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Koichi Takashima, Hiromichi Tokuda
  • Publication number: 20020105788
    Abstract: In a method of manufacturing a laminated ceramic electronic component, a first transfer sheet in which a composite green sheet having a non-magnetic ceramic area and a magnetic ceramic area is supported by a supporting film, and a second transfer sheet in which a ceramic green sheet is supported by a supporting film are prepared. The method includes the first transfer step of sequentially transferring the ceramic green sheet onto a lamination stage, the second transfer step of transferring the composite green sheet, the third transfer step of transferring the ceramic green sheet of the second transfer sheet, and the step of obtaining a laminate.
    Type: Application
    Filed: November 9, 2001
    Publication date: August 8, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Hiromichi Tokuda, Takashi Tomohiro
  • Publication number: 20020105052
    Abstract: In a method for manufacturing a laminated ceramic electronic component, a first transfer member and a second transfer member are prepared on a lamination stage to produce the laminated ceramic electronic component. The first transfer member includes a conductor-attached composite green sheet having a conductor on a portion of the surface thereof, including a non-magnetic ceramic region and a magnetic ceramic region, and a first carrier film that carries the conductor-attached composite green sheet. The second transfer member includes a ceramic green sheet and a carrier film that carries the ceramic green sheet. The laminated ceramic electronic component is thus produced through a first transfer step in which the ceramic green sheets are successively transferred, through a second transfer step in which the conductor-attached composite green sheet is transferred, and through a third transfer step in which the ceramic green sheet of the second transfer member is transferred.
    Type: Application
    Filed: November 9, 2001
    Publication date: August 8, 2002
    Inventors: Hiromichi Tokuda, Takashi Tomohiro
  • Publication number: 20020092599
    Abstract: A method of producing a laminated ceramic electronic component results in an increased thickness of an internal electrode, reduced delamination, and produces a laminated ceramic electronic component having outstanding reliability. The method of producing a laminated ceramic electronic component includes the step of forming a green sheet supported on a carrier film and having an internal electrode paste layer configured to pass through the green sheet from the upper surface to the lower surface thereof, and a ceramic paste layer, the two layers being provided with a space therebetween, and the step of repeating the step of press-bonding the laminate of the green sheet and the carrier film, and separating the carrier film to obtain a ceramic laminate, pressing the ceramic laminate in the thickness direction, and then firing the laminate to obtain a ceramic sintered body.
    Type: Application
    Filed: January 12, 2001
    Publication date: July 18, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
  • Publication number: 20010015250
    Abstract: A manufacturing method for a laminated ceramic electronic component is performed such that the thickness of the inner electrode is greatly increased, delamination does not occur, and reliability is superior. The manufacturing method for the laminated ceramic electronic component includes a process in which a green sheet including the inner electrode paste layer and the ceramic paste layer, is provided on a carrier sheet such that the inner electrode paste layer penetrates the green sheet from the top surface to the bottom surface thereof, and a process, in which laminates of the green sheet and the carrier film are adhered by pressing, and thereafter the carrier film is peeled off, are repeated to obtain the ceramic laminate, and the ceramic laminate is fired after pressing in the direction of the thickness to obtain the ceramic sintered body.
    Type: Application
    Filed: December 20, 2000
    Publication date: August 23, 2001
    Inventors: Hiromichi Tokuda, Shingo Okuyama, Tsuyoshi Tatsukawa, Makoto Fukuda
  • Patent number: 6157285
    Abstract: A laminated inductor has an increased mechanical strength and includes insulating sheets each having coil conductors and relay via holes, and protective sheets each having lead via holes. The coil conductors are electrically connected in series via the relay via holes to define a coil having a substantially rhomboid shape. Each of the coil conductors is a pattern having a 1/2 turn which is substantially V-shaped. Each coil conductor is arranged at oblique angles relative to the edges of the respective insulating sheet, and the peripheral surfaces of the coil are inclined relative to the peripheral surfaces of the inductor.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: December 5, 2000
    Assignee: Murata Manufacturing Co, Ltd
    Inventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
  • Patent number: 5602517
    Abstract: A laminate type LC composite device which has two coil sections each of which is a laminate of coil conductors and insulating sheets and a capacitor section which is a laminate of capacitor conductors and dielectric sheets. The LC composite device has at least two coils, and the coils are coiled in mutually opposite directions.
    Type: Grant
    Filed: July 26, 1995
    Date of Patent: February 11, 1997
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Toshimi Kaneko, Hiromichi Tokuda, Yasuhiro Nakata
  • 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: 5561586
    Abstract: An electronic device which has, on a rectangular insulating substrate, an input electrode and an output electrode, grounding electrodes and a conductor for electrically connecting the input electrode and the output electrode. The input electrode and the output electrode are disposed on both ends of the substrate. The grounding electrodes are disposed on side surfaces of the substrate in the center, and the conductor is disposed on an upper surface of the substrate. The conductor is a conductor with a high conductivity, a resistor or a coil. A capacity is generated between the conductor and the grounding electrode. If the conductor is a resistor, an RC circuit is formed.
    Type: Grant
    Filed: March 3, 1995
    Date of Patent: October 1, 1996
    Assignee: Murata Manufacturing Co, Ltd.
    Inventors: Takashi Tomohiro, Hiromichi Tokuda
  • Patent number: 5546058
    Abstract: A feedthrough electronic device which has an electronic element with a feedthrough hole and a center conductor which penetrates the electronic element. The center conductor is composed of a lead line portion and a spring portion which protrudes from the lead line portion and contacts with an inner periphery of the electronic element with pressure. A wide portion for preventing deformation is provided at the spring portion. A ferrite bead, a doughnut-shaped capacitor or a tubular capacitor can be used as the electronic element which has a feedthrough hole. The lead line portion of the center conductor and the spring portion can be produced separately or integrally.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: August 13, 1996
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takahiro Azuma, Hiromichi Tokuda, Toshimi Kaneko
  • Patent number: 5530411
    Abstract: A laminate type LC composite device has a coil connected in series between an input electrode and an output electrode, and a capacitor connected in parallel between the input electrode and the output electrode. Further, a micro coil is connected to the coil in series. The coil has an inductance of L and a stray capacitance of C, and the micro coil has an inductance of L' and a stray capacitance of C'. The inductances L and L', and the stray capacitances C and C' fulfill the conditions: LC>L'C', to thereby increase the high-frequency characteristics and the insertion loss in a high frequency area of the LC composite device.
    Type: Grant
    Filed: December 22, 1994
    Date of Patent: June 25, 1996
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yasuhiro Nakata, Hiromichi Tokuda, Toshimi Kaneko, Yukio Sakamoto
  • Patent number: 5414220
    Abstract: Disclosed herein is a flexible wiring cable being provided on its forward end with a connecting portion to be connected with a connector, which comprises a base film, a wiring conductor provided on the base film, a dielectric member electrically connected with the wiring conductor in the connecting portion of the base film, and a ground electrode electrically connected with the dielectric member for forming a capacitor with the wiring conductor.
    Type: Grant
    Filed: October 19, 1993
    Date of Patent: May 9, 1995
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yoshio Hanato, Toshio Hori, Hiromichi Tokuda, Toshimi Kaneko