Patents by Inventor Tetsuhiko Mizoguchi
Tetsuhiko Mizoguchi 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: 6903645Abstract: This invention provides a surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.Type: GrantFiled: March 4, 2004Date of Patent: June 7, 2005Assignees: Kawatetsu Mining Co., Ltd., Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Shigeru Yatabe, Yasutaka Fukuda, Yoshihito Tachi
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Patent number: 6831543Abstract: A surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.Type: GrantFiled: February 23, 2001Date of Patent: December 14, 2004Assignees: Kawatetsu Mining Co., Ltd., Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Shigeru Yatabe, Yasutaka Fukuda, Yoshihito Tachi
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Publication number: 20040166370Abstract: This invention provides a surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.Type: ApplicationFiled: March 4, 2004Publication date: August 26, 2004Applicants: Kawatetsu Mining Co., Ltd., Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Shigeru Yatabe, Yasutaka Fukuda, Yoshihito Tachi
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Patent number: 6593841Abstract: 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: GrantFiled: August 23, 1996Date of Patent: July 15, 2003Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Toshiro Sato, Masashi Sahashi, Michio Hasegawa, Hiroshi Tomita, Atsuhito Sawabe
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Patent number: 6414564Abstract: The present invention is directed to a magnetic thin-film device whose operating frequency band ranges from several millihertz (MHz) to several gigahertz (GHz) and which is used as an inductor for a switching power supply, a noise filter, a reception circuit for receiving a quasi-microwave and a magnetic sensor. In this device, uniaxial magnetic anisotropy is guided to a magnetic layer, and the magnetic layer is sandwiched between dielectric layers to form a propagation path of electromagnetic wave. A microstrip line is provided on the top surface of the propagation path, while an insulative underlying substrate is formed on the bottom surface thereof with a lower grounded conductor interposed therebetween. Thus, the wavelength of the propagation path can be shortened to miniaturize the device. The device is rapidly improved in characteristics and miniaturized further, resulting in reduction in manufacturing costs.Type: GrantFiled: August 1, 2000Date of Patent: July 2, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Toshirou Sato
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Patent number: 6404317Abstract: 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: GrantFiled: August 23, 1996Date of Patent: June 11, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Toshiro Sato, Masashi Sahashi, Michio Hasegawa, Hiroshi Tomita, Atsuhito Sawabe
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Patent number: 6356079Abstract: The present invention provides a magnetic-field sensor using a magnetic substance. In the magnetic-field sensor, a transmission-line element constituted of a conductor layer, dielectric layer and a magnetic layer is inserted in a feedback circuit of a phase-shift type oscillation circuit using an open-loop operational amplifier as an amplifier. An output of the operational amplifier is fed back to an input thereof through the transmission-line element. Thus, a variation in oscillation frequency depending upon the intensity of an external magnetic field is detected as an output of the sensor.Type: GrantFiled: December 14, 1999Date of Patent: March 12, 2002Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Toshiro Sato
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Publication number: 20010024739Abstract: This invention provides a surface mounting type planar magnetic device comprised of upper ferrite magnetic film, lower ferrite magnetic film and a planar coil interposed therebetween. For applying surface mount technology, an opening is formed in the upper ferrite magnetic film above a coil terminal portion and then, an external electrode conductive with the coil terminal portion through the opening is formed on the upper ferrite magnetic film. Further, this surface mounting type planar magnetic device is of a thin structure and can be mounted on the surface of a printed board. Its power loss is small, its inductance is large, its frequency characteristic is excellent, the disparity of the characteristic is small and its reliability is excellent.Type: ApplicationFiled: February 23, 2001Publication date: September 27, 2001Applicant: KAWATETSU MINING CO., LTD.Inventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Shigeru Yatabe, Yasutaka Fukuda, Yoshihito Tachi
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Patent number: 6121852Abstract: The present invention is directed to a magnetic thin-film device whose operating frequency band ranges from several millihertz (MHz) to several gigahertz (GHz) and which is used as an inductor for a switching power supply, a noise filter, a reception circuit for receiving a quasi-microwave and a magnetic sensor. In this device, uniaxial magnetic anisotropy is guided to a magnetic layer, and the magnetic layer is sandwiched between dielectric layers to form a propagation path of electromagnetic wave. A microstrip line is provided on the top surface of the propagation path, while an insulative underlying substrate is formed on the bottom surface thereof with a lower grounded conductor interposed therebetween. Thus, the wavelength of the propagation path can be shortened to miniaturize the device. The device is rapidly improved in characteristics and miniaturized further, resulting in reduction in manufacturing costs.Type: GrantFiled: July 14, 1998Date of Patent: September 19, 2000Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Tetsuo Inoue, Toshirou Sato
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Patent number: 5966063Abstract: A planar magnetic device in which the high-frequency loss in the coil conductor can be reduced. The device comprises a planar coil formed of a coil conductor constituted by a plurality of conductor lines. The coil conductor is provided in the form of a spiral. The planar coil is interposed between two insulating layers which are sandwiched between two soft-magnetic layers.Type: GrantFiled: August 19, 1996Date of Patent: October 12, 1999Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Tetsuhiko Mizoguchi
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Patent number: 5801521Abstract: 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: GrantFiled: September 3, 1996Date of Patent: September 1, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Toshiro Sato, Masashi Sahashi, Michio Hasegawa, Hiroshi Tomita, Atsuhito Sawabe
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Patent number: 5780177Abstract: A magnetic thin film is disclosed which has a composition represented substantially by the following chemical formula and, the same time, has the whole or part of the thin film formed of an amorphous region:{(Fe.sub.1-x Co.sub.x).sub.1-y (B.sub.1-z X.sub.z).sub.y }.sub.1-a RE.sub.awherein X represents at least one element selected from among the Group 4B elements in the CAS version of the Periodic Table, RE represents rare earth elements including Sm, and x, y, z, and a represent numerical values satisfying the following expressions, 0<x<1, 0<z<1, 0.05<y<0.36, and 0<a.ltoreq.0.1.Type: GrantFiled: September 26, 1996Date of Patent: July 14, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Tomita, Tetsuhiko Mizoguchi
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Patent number: 5750273Abstract: A thin film magnetic element is disclosed which uses a soft magnetic thin film having a composition represented by the general formula:T.sub.100-x-y M.sub.x (AO.sub.v).sub.y(wherein T stands for at least one element selected from the group consisting of Fe and Co, M for at least one element selected from the group consisting of Zr, Hf, Nb, and Y, and A for at least one element selected from the group consisting of Si, Ge, Sn, B, P, and C, and x, y, and v respectively satisfy the expressions, 5.ltoreq.x.ltoreq.20 at. %, 8.ltoreq.y.ltoreq.25 at. %, and 0.ltoreq.v.ltoreq.2), consisting of a homogeneous amorphous phase, and having resistivity of not less than 1000 .mu..OMEGA..multidot.cm. Further, a thin film magnetic element is disclosed which uses a soft magnetic thin film of a microstructure having a composition substantially represented by the general formula, T.sub.100-x-z M.sub.x (AO.sub.v).sub.z (1.ltoreq.z.+-.10 at.Type: GrantFiled: March 29, 1996Date of Patent: May 12, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuo Inoue, Hiroshi Tomita, Tetsuhiko Mizoguchi, Hiromi Fuke
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Patent number: 5738931Abstract: A electronic device is disclosed having an underlying conductor formed in a predetermined pattern on a surface of an underlying insulator and made of at least one member selected from the group consisting of Ti, Ta, Mo, Cr, Nb and W and their alloy, a main conductor made of Cu formed in a predetermined pattern on the underlying conductor, a first coating conductor made of at least one member selected from the group consisting of Ti, Ta, Mo, Nb and Ni and their alloy, and a second coating conductor made of at least one member selected from the group consisting of Au and Al and their alloy that are formed in this order so as to coat a surface of the main conductor made of Cu facing the surrounding insulator.Type: GrantFiled: September 13, 1995Date of Patent: April 14, 1998Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Tetsuhiko Mizoguchi
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Patent number: 5694030Abstract: Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.Type: GrantFiled: September 16, 1996Date of Patent: December 2, 1997Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Kunio Matsukura, Isamu Yanase, Yuji Iseki, Tetsuhiko Mizoguchi, Yuji Ide, Michio Hasegawa, Yoshihiko Yamaguchi, Yasunori Iwamoto
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Patent number: 5583424Abstract: Disclosed is a dc-to-dc converter comprising a switching transistor, a pulse-width modulation controller, a sandwich-type planar inductor, which accumulates an electromagnetic energy at ON state and releases the accumulated electromagnetic energy at OFF state of the switching transistor, a smoothing capacitor, a rectifying element, and a planar search coil for detecting an overcurrent flowing the planar coil, disposed on one of the outer surfaces of the soft magnetic layers constituting the planar inductor.Type: GrantFiled: March 15, 1994Date of Patent: December 10, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Kunio Matsukura, Isamu Yanase, Yuji Iseki, Tetsuhiko Mizoguchi, Yuji Ide, Michio Hasegawa, Yoshihiko Yamaguchi, Yasunori Iwamoto
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Patent number: 5583474Abstract: 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: GrantFiled: May 25, 1994Date of Patent: December 10, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Tetsuhiko Mizoguchi, Toshiro Sato, Masashi Sahashi, Michio Hasegawa, Hiroshi Tomita, Atsuhito Sawabe
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Patent number: 5572478Abstract: A power supply unit including DC-DC converter using a thin and planar inductor arranged in an IC memory card incorporating an EEPROM memory chip, wherein a voltage is adjusted by a dropping regulator, thereby reducing power consumption. The thin and planar inductor includes, stacked on a semiconductor substrate, a planar coil and magnetic thin films formed to sandwich the planar coil, so that an entire area of an IC card can be decreased. The IC card can be driven by a single power supply, thus providing a compact portable information device which can be driven by a battery for a long time.Type: GrantFiled: March 31, 1995Date of Patent: November 5, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Tomoharu Tanaka, Tetsuhiko Mizoguchi, Yuji Ide
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Patent number: 5537036Abstract: A high frequency magnetic property measuring apparatus for soft magnetic film includes a magnetic detection device for detecting the intensity of magnetization in a sample material, a high frequency magnetic field generator for generating magnetic field, a power source for supplying current to the magnetic field generator, and a data processing device for getting high frequency magnetic parameters of the sample by using a detection signal output from the magnetic detector. The magnetic field generator is made up of a plane-shaped coil of a conductor having a configuration in which both ends of the plane-shaped coil are closed to form a cavity as a second internal cavity in which the detector is placed. The magnetic detector is made up of a plane-shaped coil of a conductor having a configuration in which both ends of said plane-shaped coil are closed to form a cavity as a first internal cavity in which the sample material is placed. The magnetic detector is placed in the magnetic field generator.Type: GrantFiled: September 8, 1993Date of Patent: July 16, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Toshiro Sato, Tetsuhiko Mizoguchi
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Patent number: 5522946Abstract: An amorphous magnetic thin film possesses as at least part of a thin film forming area a microstructure composed of a first amorphous phase containing at least either of iron and cobalt and bearing magnetism and a second amorphous phase disposed round the first amorphous phase and containing boron and at least one element selected from among the elements of the 4B Group in the Periodic Table of Elements and exhibits uniaxial magnetic anisotropy in the plane of film. The amorphous magnetic thin film possesses soft magnetism concurrently satisfying high saturation magnetization and high resistivity and, at the same time, easily acquires high frequency permeability by applying magnetic field in the hard axis of magnetization. Use of these amorphous magnetic thin films for plane magnetic elements permits the plane magnetic elements to be miniaturized and to be endowed with exalted performance. The amorphous magnetic thin film possesses a composition substantially represented by the formula:(Fe.sub.1-x Co.sub.x).Type: GrantFiled: June 28, 1994Date of Patent: June 4, 1996Assignee: Kabushiki Kaisha ToshibaInventors: Hiroshi Tomita, Tetsuo Inoue, Hiromi Fuke, Toshiro Sato, Tetsuhiko Mizoguchi