Patents by Inventor Osamu Kobayashi

Osamu Kobayashi 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).

  • Mn-Zn ferrite and production process thereof
    Patent number: 6547984
    Abstract: The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a high initial permeability of 3000 or more at 100 kHz and 100 or more at 10 MHz. The main components of the Mn—Zn ferrite are 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.02 to 1.00 mol % Mn2O3 and the remainder MnO. The Mn—Zn ferrite is enabled to be used in a wide frequency region from 100 kHz to 10 MHz by limiting Fe2O3 content to less than 50 mol % that is the stoichiometric composition and inhibiting formation of Mn2O3.
    Type: Grant
    Filed: January 18, 2001
    Date of Patent: April 15, 2003
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Semiconductor device and method of manufacturing the same
    Publication number: 20030062564
    Abstract: A lower electrode of a capacitor element and a wiring are formed in a wiring layer that is one layer below an uppermost wiring layer. Subsequently, after the formation of a capacitance insulating film, a TiN film is formed on the entire surface thereof, and then the TiN film is patterned, thereby forming an upper electrode of a capacitor element and a lead wiring for electrically connecting the upper electrode to a wiring of a third wiring layer. Furthermore, in the uppermost layer, a shield is formed covering the upper portion of the capacitor element.
    Type: Application
    Filed: April 2, 2002
    Publication date: April 3, 2003
    Applicant: Fujitsu Limited
    Inventors: Osamu Kobayashi, Akiyoshi Watanabe
  • Mn-Zn ferrite and coil component with magnetic core made of same
    Publication number: 20030059365
    Abstract: A Mn—Zn ferrite and a coil component are provided which obtains a low core loss in a frequency band above 1 MHz and even above 5 MHz and which can duly function in such a high frequency band. The Mn—Zn contains as basic components 44.00 to 50.0 mol % Fe2O3 (50 mol % excluded), 4.0 to 26.5 mol % ZnO, and remainder MnO, and has a dielectric loss tan &dgr; of 0.3 or less at 1 kHz, and a complex relative permittivity &egr; of 1,000 or less at 1 MHz, whereby a core loss decreases in the high frequency band.
    Type: Application
    Filed: August 8, 2002
    Publication date: March 27, 2003
    Applicant: MINEBEA CO., LTD.
    Inventors: Kiyoshi Ito, Osamu Kobayashi, Yukio Suzuki
  • Mn-Zn ferrite and coil component using same
    Publication number: 20030034096
    Abstract: The Mn-Zn ferrite of the present invention contains basic components of 44.0 to 50.0 mol % (50.0 mol % is excluded) Fe2O3, 4.0 to 26.5 mol % ZnO and the remainder MnO, and has a real part &egr;′ of complex relative permittivity of 20,000 or less at 1 kHz and 50 or less at 1 MHz, thereby maintaining initial permeability in a wide frequency band, showing a low stray capacitance with a coil provided, and ensuring an excellent impedance in a wide frequency band. And a coil using the Mn-Zn ferrite as a magnetic core is also provided.
    Type: Application
    Filed: August 2, 2002
    Publication date: February 20, 2003
    Applicant: MINEBEA CO., LTD
    Inventors: Kiyoshi Ito, Osamu Kobayashi, Yukio Suzuki
  • Optical fiber coupler receptacle member
    Publication number: 20030012518
    Abstract: An optical fiber coupler receptacle member having simple construction with superior molding ability and can easily perform fixing and coupling operation. The optical fiber coupler receptacle member has a base body formed with a receptacle groove adapting to a shape of an optical fiber coupler having coated fiber portions, bear fiber portions and a molten and elongated portion, and a cover engaged with and covering the base body in order to protect the optical fiber coupler fixed to the base body.
    Type: Application
    Filed: July 12, 2002
    Publication date: January 16, 2003
    Applicant: NTT ADVANCED TECHNOLOGY CORPORATION
    Inventors: Satoru Tomaru, Takashi Uetake, Osamu Kobayashi, Hiroaki Akita, Saburo Imamura
  • MN-ZN FERRITE AND PRODUCTION PROCESS THEREOF
    Publication number: 20020171064
    Abstract: The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and a low core loss in a high frequency region exceeding 1 MHz. A basic component composition of the Mn—Zn ferrite includes 44.0 to 49.8 mol % of Fe2O3, 6.0 to 15.0 mol % of ZnO (15.0 mol % is excluded), 0.1 to 3.0 mol % of CoO, 0.02 to 1.20 mol % of Mn2O3, and the remainder of MnO. The Mn—Zn ferrite achieves desired purposes by controlling Fe2O3 content to a range less than 50 mol % that is the stoichiometric composition, adding a proper amount of CoO, restraining amount of Mn2O3 formation to 1.20 mol % or less, and further setting their average grain sizes to less than 10 &mgr;m.
    Type: Application
    Filed: March 1, 2001
    Publication date: November 21, 2002
    Applicant: MINEBEA CO., LTD.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Mn-Zn ferrite and production process thereof
    Patent number: 6468441
    Abstract: The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and a low core loss in a high frequency region exceeding 1 MHz. A basic component composition of the Mn—Zn ferrite includes 44.0 to 49.8 mol % of Fe2O3, 6.0 to 15.0 mol % of ZnO (15.0 mol % is excluded), 0.1 to 3.0 mol % of CoO, 0.02 to 1.20 mol % of Mn2O3, and the remainder of MnO. The Mn—Zn ferrite achieves desired purposes by controlling Fe2O3 content to a range less than 50 mol % that is the stoichiometric composition, adding a proper amount of CoO, restraining amount of Mn2O3 formation to 1.20 mol % or less, and further setting their average grain sizes to less than 10 &mgr;m.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: October 22, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Inductance device formed on semiconductor substrate
    Publication number: 20020149088
    Abstract: According to a first aspect of the present invention, a plurality of PN junctions are formed at the surface of a semiconductor substrate under a belt-like conductive film having a spiral shape which constitutes an inductance device. An inverted bias voltage is applied to the PN junctions, and the surface of the substrate is completely depleted. Since the inverted bias voltage is applied to the PN junctions, even though the impurity density of the surface of the substrate is high and the adjacent PN junctions are separated to a degree, the extension of the depletion layers can be increased and complete depletion of the surface of the substrate can be achieved.
    Type: Application
    Filed: June 7, 2002
    Publication date: October 17, 2002
    Applicant: Fujitsu Limited
    Inventor: Osamu Kobayashi
  • Mn-Zn ferrite and production process thereof
    Patent number: 6461531
    Abstract: The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a low core loss in a high frequency region exceeding 1 MHz. The basic component composition of the Mn—Zn ferrite includes 44.0 to 49.8 mol % Fe2O3, 6.0 to 15.0 mol % ZnO (15.0 mol % is excluded), 0.1 to 4.0 mol % at least one of TiO2 and SnO2, and remainder MnO, wherein desired results are obtained by limiting Fe2O3 content to less than 50 mol % that is the stoichiometric composition and adding a proper amount of TiO2 or SnO2 and further controlling its average grain size to less than 10 &mgr;m.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: October 8, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Optical fiber coupler, manufacturing method and apparatus thereof
    Publication number: 20020122631
    Abstract: An optical fiber coupler according to the present invention comprises two optical fibers which each include a core portion serving to propagate light and a clad portion surrounding said core portion, the two optical fibers extending substantially in parallel in a same flat plane, and a melting portion in which the clad portions of the two optical fibers are fused together substantially in a line contact. Two optical fibers are arranged in parallel to permit at least parts of the clad portions to be brought into contact with each other. In this state, the two optical fibers are heated and fused mutually substantially in a line contact and are further drawn for fabrication thereof. The optical fibers are heated preferably employing an electric ceramic microheater. The two optical fibers may be same or different in structural parameters.
    Type: Application
    Filed: March 29, 2001
    Publication date: September 5, 2002
    Inventors: Satoru Tomaru, Osamu Kobayashi, Takashi Uetake
  • Mn-Zn ferrite and production process thereof
    Patent number: 6440323
    Abstract: This invention provides a Mn—Zn ferrite which has a high electrical resistance and can sufficiently satisfy the use in a high frequency region exceeding 1 MHz. This invention further provides a production process of the Mn—Zn ferrite in which mixed powder whose components are adjusted so as to have a basic component composition containing 44.0 to 50.0 mol% Fe2O3, 4.0 to 26.5 mol % ZnO, 0.1 to 8.0 mol % one or two from TiO2 and SnO2 and the remainder consisting of MnO, and further to contain 0.01 to 2.00 mass % one or more of CoO, NiO, and MgO as additive is pressed, then sintered and cooled in the air or in an atmosphere containing some amount of oxygen.
    Type: Grant
    Filed: October 18, 2000
    Date of Patent: August 27, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Mn-Zn ferrite and production process thereof
    Patent number: 6436308
    Abstract: The present invention provides a Mn—Zn ferrite having an electrical resistivity exceeding 1 &OHgr;m order and having a high initial permeability of 4000 or more at 100 kHz and 100 or more at 10 MHz. The main components of the Mn—Zn ferrite include 44.0 to 49.8 mol % Fe2O3, 15.0 to 26.5 mol % ZnO, 0.1 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn2O3, and the remainder MnO. The Mn—Zn ferrite can be used in a wide frequency region of 100 kHz to 10 MHz by limiting Fe2O3 content to a range of less than 50 mol %, that is the stoichiometric composition, inhibiting formation of Mn2O3 and adding a proper amount of CoO.
    Type: Grant
    Filed: January 26, 2001
    Date of Patent: August 20, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Production process of Mn-Zn ferrite
    Publication number: 20020096665
    Abstract: The present invention provides a production process of a Mn-Zn ferrite that enables wastes of sintered cores to be recycled without serious difficulties in sintering. The production process comprises recycling a powder obtained by milling a sintered Mn-Zn ferrite, thereby obtaining a sintered core having a component composition including 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, 1.0 to 3.0 mol % CoO, 0.02 to 1.00 mol % Mn2O3 and a remainder MnO.
    Type: Application
    Filed: November 21, 2001
    Publication date: July 25, 2002
    Applicant: MINEBEA CO., LTD.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Production process of Mn-Zn ferrite
    Publication number: 20020093000
    Abstract: The present invention provides a production process of a Mn—Zn ferrite that enables wastes of sintered cores to be recycled without serious difficulties in sintering. The production process comprises recycling a powder obtained by milling a sintered Mn—Zn ferrite, thereby obtaining a sintered core having a component composition including 44.0 to 49.8 mol % Fe2O3, 4.0 to 26.5 mol % ZnO, 0.02 to 1.00 mol % Mn2O3 and a remainder MnO.
    Type: Application
    Filed: November 21, 2001
    Publication date: July 18, 2002
    Applicant: MINEBEA CO., LTD.
    Inventors: Osamu Kobayashi, Osamu Yamada, Kiyoshi Ito
  • Common mode choke coil
    Publication number: 20020080001
    Abstract: The present invention provides a common mode chalk coil described below that is capable of providing improved characteristics at high frequencies.
    Type: Application
    Filed: December 27, 2001
    Publication date: June 27, 2002
    Applicant: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Yukio Suzuki, Kiyoshi Ito
  • Process for producing Mn-Zn ferrite
    Patent number: 6403017
    Abstract: A process for producing Mn—Zn ferrite having large electrical resistance and being durable to the use in high frequency region exceeding 1 MHz easily and at low cost is disclosed. The process comprises pressing a mixed powder comprising a composition of 44.0 to 50.0 mol % of Fe2O3, 4.0 to 26.5 mol % of ZnO, 0.1 to 8.0 mol % of at least one member selected from the group consisting of TiO2 and SnO2, and the remainder being MnO, and if desired 0.1 to 16.0 mol % of CuO, sintering the resulting green compact in the air or an atmosphere containing an appropriate amount of oxygen, and then cooling the green compact, thereby securing the estimated high initial permeability even in a high frequency region of 1 MHz or more.
    Type: Grant
    Filed: November 18, 1999
    Date of Patent: June 11, 2002
    Assignee: Minebea Co., Ltd.
    Inventors: Osamu Kobayashi, Osamu Yamada, Koji Honda, Shunji Kawasaki
  • Vehicle dynamics control system and vehicle having the vehicle dynamics control system
    Publication number: 20020045981
    Abstract: A correction factor setting unit sets correction factors for a front-rear traction distribution control unit, an anti-lock brake control unit, a traction control unit, and a braking power control unit according to the situation of a road and the shape thereof which are inputted from a road information recognizing unit. At this time, the correction factors are preset values according to the situation of the road and the shape thereof so that the actions of the control units will be balanced with each other. Consequently, the plurality of vehicle behavior control units mounted in a vehicle act efficiently according to the situation of the road, on which the vehicle is driven forwards, and the shape thereof while quickly responding to the situation of the road and the shape thereof. Besides, the actions of the vehicle behavior control units are balanced with one another.
    Type: Application
    Filed: July 19, 2001
    Publication date: April 18, 2002
    Applicant: Fuji Jukogyo Kabushiki Kaisha
    Inventors: Katsufumi Ichikawa, Takayuki Ushijima, Ryo Nitta, Katsumi Tomioka, Osamu Kobayashi
  • Heat exchanger having multi-hole structured tube
    Patent number: 6340055
    Abstract: A tube for a heat exchanger has notch portions at a longitudinal direction end portion to be inserted into a header tank. Further, several passage holes are provided in the tube to extend in a longitudinal direction of the tube in which refrigerant flows. The notch portions are formed by cutting parts of the tube to be defined by cut surfaces. The passage holes are not provided at portions corresponding to the cut surfaces. Therefore, the passage holes are securely prevented from being crushed and cut when the notch portions are formed by cutting. As a result, joining failure between the tube and the header tank can be prevented.
    Type: Grant
    Filed: May 25, 2000
    Date of Patent: January 22, 2002
    Assignee: Denso Corporation
    Inventors: Yoshiyuki Yamauchi, Ken Yamamoto, Osamu Kobayashi, Minoru Ohta, Toshiya Nagasawa
  • CCM calculating system, CCM calculating method and recording medium
    Publication number: 20010052904
    Abstract: The object of the invention is to provide a CCM calculating system being relatively inexpensive and alleviating the necessity of a spectrophotometer, a CCM calculating method and a recording medium. A CCM calculating system according to the invention calculates a blending ratio of colorants based on stored color data 16. The system has an input device 5 (20b) for inputting data of color specification values corresponding to a desired target color; and a data operation unit 1 (20c) for calculating a blending ratio of colorants for reproducing the target color, based on the input data of color specification values and stored color data. Since the blending ratio of colorants for reproducing the desired target color may be calculated based on the input color specification value data and stored color data, such CCM calculation may be performed without the necessity of a spectrophotometer.
    Type: Application
    Filed: June 14, 2001
    Publication date: December 20, 2001
    Applicant: DAINICHISEIKA COLOR & CHEMICALS MFG CO., LTD
    Inventors: Kazuo Sano, Fumiyoshi Saito, Osamu Kobayashi
  • Output circuit for electronic devices
    Patent number: 6329842
    Abstract: An output circuit that prevents the flow of a leakage current from its output terminal to a power supply is able to accommodate voltage levels higher than the power supply voltage level. The output circuit includes a p-channel MOS transistor connected between the output terminal and a high potential power supply. A first switch circuit is connected between the transistor and the high potential power supply. The first switch circuit selectively connects and disconnects a back-gate of the transistor and the high potential power supply in response to an external signal applied to the output terminal.
    Type: Grant
    Filed: April 11, 2000
    Date of Patent: December 11, 2001
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Naritomi, Osamu Kobayashi