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).
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Patent number: 6498553Abstract: 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: GrantFiled: August 21, 2000Date of Patent: December 24, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Tadashi Tanaka, Hiromichi Tokuda
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Patent number: 6466120Abstract: 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: GrantFiled: October 5, 2000Date of Patent: October 15, 2002Assignee: Murata Manufacturing Co., Ltd.Inventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
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Publication number: 20020144765Abstract: 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: ApplicationFiled: February 20, 2002Publication date: October 10, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Tsuyoshi Tatsukawa, Hiromichi Tokuda
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Publication number: 20020140539Abstract: 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: ApplicationFiled: January 18, 2002Publication date: October 3, 2002Inventors: Koichi Takashima, Hiromichi Tokuda
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Publication number: 20020121957Abstract: 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: ApplicationFiled: February 19, 2002Publication date: September 5, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Koichi Takashima, Hiromichi Tokuda
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Publication number: 20020105788Abstract: 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: ApplicationFiled: November 9, 2001Publication date: August 8, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Hiromichi Tokuda, Takashi Tomohiro
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Publication number: 20020105052Abstract: 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: ApplicationFiled: November 9, 2001Publication date: August 8, 2002Inventors: Hiromichi Tokuda, Takashi Tomohiro
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Publication number: 20020092599Abstract: 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: ApplicationFiled: January 12, 2001Publication date: July 18, 2002Applicant: Murata Manufacturing Co., Ltd.Inventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
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Publication number: 20010015250Abstract: 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: ApplicationFiled: December 20, 2000Publication date: August 23, 2001Inventors: Hiromichi Tokuda, Shingo Okuyama, Tsuyoshi Tatsukawa, Makoto Fukuda
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Patent number: 6157285Abstract: 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: GrantFiled: May 18, 1998Date of Patent: December 5, 2000Assignee: Murata Manufacturing Co, LtdInventors: Hiromichi Tokuda, Tsuyoshi Tatsukawa
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Patent number: 5602517Abstract: 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: GrantFiled: July 26, 1995Date of Patent: February 11, 1997Assignee: Murata Manufacturing Co., Ltd.Inventors: Toshimi Kaneko, Hiromichi Tokuda, Yasuhiro Nakata
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Patent number: 5578981Abstract: 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: GrantFiled: May 5, 1993Date of Patent: November 26, 1996Assignee: Murata Manufacturing Co., Ltd.Inventor: Hiromichi Tokuda
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Patent number: 5561586Abstract: 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: GrantFiled: March 3, 1995Date of Patent: October 1, 1996Assignee: Murata Manufacturing Co, Ltd.Inventors: Takashi Tomohiro, Hiromichi Tokuda
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Patent number: 5546058Abstract: 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: GrantFiled: December 22, 1994Date of Patent: August 13, 1996Assignee: Murata Manufacturing Co., Ltd.Inventors: Takahiro Azuma, Hiromichi Tokuda, Toshimi Kaneko
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Patent number: 5530411Abstract: 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: GrantFiled: December 22, 1994Date of Patent: June 25, 1996Assignee: Murata Manufacturing Co., Ltd.Inventors: Yasuhiro Nakata, Hiromichi Tokuda, Toshimi Kaneko, Yukio Sakamoto
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Patent number: 5414220Abstract: 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: GrantFiled: October 19, 1993Date of Patent: May 9, 1995Assignee: Murata Manufacturing Co., Ltd.Inventors: Yoshio Hanato, Toshio Hori, Hiromichi Tokuda, Toshimi Kaneko