Patents by Inventor Fuminori Nakamura

Fuminori Nakamura 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: 7095366
    Abstract: A high-frequency oscillation apparatus wherein an oscillation signal output from a voltage controlled oscillator (VCO) is transferred through a transfer line to a resonator and the resonator is excited. The resonator is coupled with a second transfer line and an RF signal having a level corresponding to the frequency of the oscillation signal is transferred through the second transfer line. When the resonant frequency of the resonator is set to a frequency higher than the oscillation-frequency modulation range of the VCO, the oscillation frequency and the RF-signal level have one-to-one correspondence. A detector detects the RF signal and outputs to a control section. The control section compensates a control voltage signal applied to the VCO according to the detected-signal level, and outputs the control voltage signal to the VCO to compensate the oscillation signal of the VCO.
    Type: Grant
    Filed: January 15, 2004
    Date of Patent: August 22, 2006
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Takatoshi Kato, Toru Ishii, Fuminori Nakamura
  • Publication number: 20050156809
    Abstract: A radio wave reflector has a function of reflecting radio waves in every direction in the plane including the incoming direction of the radio waves and can be fitted to various miscellaneous structures. The radio wave reflector includes a radio wave reflection material which is a conductor, and a base material including the radio wave reflection material in a non-contact state, and the conductor which is the radio wave reflection material is formed of a flaky or granular metal. The radio wave reflector includes the radio wave reflection material which is a dielectric, and the base material including the radio wave reflection material, and the dielectric which is the radio wave reflection material is formed of a flaky or granular ceramic.
    Type: Application
    Filed: February 24, 2005
    Publication date: July 21, 2005
    Inventors: Fuminori Nakamura, Toru Tanizaki
  • Patent number: 6882300
    Abstract: A guide marker includes a substrate and a radio-wave reflecting unit for reflecting radio waves at certain intensity in all directions in a virtual plane, including the incident direction of the radio waves, the radio-wave reflecting unit being provided in the surface of the substrate. The radio-wave reflecting unit includes a concave and convex portions provided in the substrate or radio-wave reflectors which resonate at the frequency of incident radio waves and which reflect the radio waves in the incident direction. The radio-wave reflectors are mounted on the substrate. A visual guide marker device includes one of a light-reflecting component having a reflection characteristic and a light-generating component which self-generates light, and a guide marker including a dielectric material.
    Type: Grant
    Filed: March 25, 2003
    Date of Patent: April 19, 2005
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Fuminori Nakamura, Toru Tanizaki, Yohei Ishikawa, Taiyo Nishiyama
  • Patent number: 6822612
    Abstract: An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: November 23, 2004
    Assignee: Murata Manufacturing Co. Ltd
    Inventors: Yukio Takimoto, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa, Nobumasa Kitamori
  • Publication number: 20040178946
    Abstract: A high-frequency oscillation apparatus wherein an oscillation signal output from a voltage controlled oscillator (VCO) is transferred through a transfer line to a resonator and the resonator is excited. The resonator is coupled with a second transfer line and an RF signal having a level corresponding to the frequency of the oscillation signal is transferred through the second transfer line. When the resonant frequency of the resonator is set to a frequency higher than the oscillation-frequency modulation range of the VCO, the oscillation frequency and the RF-signal level have one-to-one correspondence. A detector detects the RF signal and outputs to a control section. The control section compensates a control voltage signal applied to the VCO according to the detected-signal level, and outputs the control voltage signal to the VCO to compensate the oscillation signal of the VCO.
    Type: Application
    Filed: January 15, 2004
    Publication date: September 16, 2004
    Inventors: Takatoshi Kato, Toru Ishii, Fuminori Nakamura
  • Publication number: 20030214429
    Abstract: A guide marker includes a substrate and a radio-wave reflecting unit for reflecting radio waves at certain intensity in all directions in a virtual plane, including the incident direction of the radio waves, the radio-wave reflecting unit being provided in the surface of the substrate. The radio-wave reflecting unit includes a concave and convex portions provided in the substrate or radio-wave reflectors which resonate at the frequency of incident radio waves and which reflect the radio waves in the incident direction. The radio-wave reflectors are mounted on the substrate. A visual guide marker device includes one of a light-reflecting component having a reflection characteristic and a light-generating component which self-generates light, and a guide marker including a dielectric material.
    Type: Application
    Filed: March 25, 2003
    Publication date: November 20, 2003
    Inventors: Fuminori Nakamura, Toru Tanizaki, Yohei Ishikawa, Taiyo Nishiyama
  • Publication number: 20030214457
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided for form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the direction coupler.
    Type: Application
    Filed: March 12, 2003
    Publication date: November 20, 2003
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Publication number: 20030179142
    Abstract: A radio wave reflector has a function of reflecting radio waves in every direction in the plane including the incoming direction of the radio waves and can be fitted to various miscellaneous structures. The radio wave reflector includes a radio wave reflection material which is a conductor, and a base material including the radio wave reflection material in a non-contact state, and the conductor which is the radio wave reflection material is formed of a flaky or granular metal. The radio wave reflector includes the radio wave reflection material which is a dielectric, and the base material including the radio wave reflection material, and the dielectric which is the radio wave reflection material is formed of a flaky or granular ceramic.
    Type: Application
    Filed: March 13, 2003
    Publication date: September 25, 2003
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Fuminori Nakamura, Toru Tanizaki
  • Patent number: 6563477
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.
    Type: Grant
    Filed: September 20, 2001
    Date of Patent: May 13, 2003
    Assignee: Murata Manufacturing Co. Ltd.
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Patent number: 6465912
    Abstract: A power transfer device includes a first current transferring section connected between a first AC power source and a load, a second current transferring section with first and second switches which have opposite conduction directions, connected in parallel, and connected between a second AC power source and the load; a current detector for detecting a current flowing from the first AC power source to the load; a generator for generating a power transfer signal instructing transfer from the first AC power source to the second AC power source; a current direction estimator for estimating the direction of a current which flows from the first AC power source to the load when the second current transferring section enters the conduction state after a time period; and a conduction signal generator for causing one of the first and second switches to be conductive, so that the current flowing from the first AC power source to the load is cancelled, and, thereafter, causing the other of the first and second switches
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: October 15, 2002
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Fuminori Nakamura, Shinzo Tamai, Isao Kamiyama, Masatoshi Takeda, Hiroshi Yamamoto, Yuji Kuroda
  • Publication number: 20020067314
    Abstract: An antenna device capable of increasing the speed of scanning as well as extending the scanning angular range of a beam to obtain a high gain. A radar module and a communication apparatus having enhanced detection capabilities obtainable by using the antenna device. In the antenna device, electromagnetic waves radiated from a primary radiator are transmitted to a plurality of openings, e.g., dielectric lenses and/or reflectors or optical transmitters. The dielectric openings are arranged on a fixed portion and the primary radiator is arranged on a moving portion. The moving portion is displaced relatively with respect to the fixed portion. This arrangement enables the selection of an opening used for receiving each of the electromagnetic waves from the primary radiator to change the direction of the beam.
    Type: Application
    Filed: September 26, 2001
    Publication date: June 6, 2002
    Applicant: Murata Manufacturing Co., Ltd.
    Inventors: Yukio Takimoto, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa, Nobumasa Kitamori
  • Patent number: 6362795
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.
    Type: Grant
    Filed: January 7, 1998
    Date of Patent: March 26, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Patent number: 6356246
    Abstract: A dielectric lens antenna includes a dielectric lens, a primary radiator and a dielectric member provided between the dielectric lens and the primary radiator. The dielectric member is formed into a substantially circular cone shape, and the dielectric constant of the dielectric member is reduced continuously in the radial direction of the dielectric lens from the center line passing through the center of the dielectric lens and the primary radiator.
    Type: Grant
    Filed: December 1, 1999
    Date of Patent: March 12, 2002
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Fuminori Nakamura, Hideaki Yamada
  • Publication number: 20020018022
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.
    Type: Application
    Filed: September 20, 2001
    Publication date: February 14, 2002
    Inventors: Yohei Ishikawa, Toru Tanizaki, Fuminori Nakamura, Ikuo Takakuwa
  • Publication number: 20010013842
    Abstract: An antenna apparatus such that a dielectric strip and a dielectric resonator are provided to form a primary vertical radiator, another dielectric strip is provided which is coupled to the dielectric strip to form a directional coupler, and a radiation beam is tilted by changing the relative position of the primary radiator with respect to the dielectric lens by displacing the primary vertical radiator in the directional coupler.
    Type: Application
    Filed: January 7, 1998
    Publication date: August 16, 2001
    Inventors: YOHEI ISHIKAWA, TORU TANIZAKI, FUMINORI NAKAMURA, IKUO TAKAKUWA
  • Patent number: 6246375
    Abstract: An antenna device has less change in gain during beam scanning, caused by the displacement of a primary radiator with respect to a dielectric lens, and scanning can be carried out over a large angular range at uniform gain. A primary radiator has a focal plane in a position deviating from the optical axis of a dielectric lens, and when the primary radiator intersects the optical axis, the primary radiator leaves the focal plane. As a consequence, by moving the primary radiator away from the optical axis to other positions, change in the gain caused by change in the open efficiency and aberration can be reduced.
    Type: Grant
    Filed: December 23, 1999
    Date of Patent: June 12, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Hideaki Yamada, Fuminori Nakamura, Toru Tanizaki, Taiyo Nishiyama
  • Patent number: 6195058
    Abstract: The invention provides a dielectric lens, wherein the dielectric lens is rotation-symmetrically shaped, and a flat end is disposed at a part of the edge the dielectric lens. By the above described structure and arrangement, it become possible to widen a half-value angle in the direction which the flat ends of the lens are disposed without reducing a gain significantly.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: February 27, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Fuminori Nakamura, Hideaki Yamada, Hiroaki Tanaka
  • Patent number: 6175335
    Abstract: A dielectric lens antenna having a lens comprising a dielectric material and a heating body disposed on a surface of the lens. The dielectric lens antenna has a snow-melting function, which prevents degradation in lens-efficiency.
    Type: Grant
    Filed: June 29, 1999
    Date of Patent: January 16, 2001
    Assignee: Murata Manufacturing Co., Ltd.
    Inventors: Yohei Ishikawa, Koichi Sakamoto, Hideaki Yamada, Fuminori Nakamura
  • Patent number: 5886888
    Abstract: A voltage source type power converting apparatus having voltage source type power converter units and phase-shifting transformers. The transformers have either a common multiple-phase primary winding or a group of parallel connected multiple-phase primary windings, either of which being connected in parallel or series to a multiple-phase AC system. The transformer further include a group of multiple-phase secondary windings with phase differences with respect to each other and which are connected to voltage source type power converter units. The voltage source type power converter units are operated with the phase differences. Accordingly, the construction of the multiplexing phase-shifting transformer is simple, and fundamental electric variables can be controlled by a simple phase controlling operation. In addition, a higher harmonic defect of the AC system can be reduced, and the DC voltage can be easily raised.
    Type: Grant
    Filed: April 26, 1996
    Date of Patent: March 23, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masahiko Akamatsu, Shinzo Tamai, Fuminori Nakamura, Shotaro Murakami, Tomohiko Aritsuka, Takeaki Asaeda
  • Patent number: 5867376
    Abstract: A power converting apparatus includes a power converter connected to a power line via a transformer 3, and current detectors 5A and 5B for detecting the currents of the windings of the transformer. The output signals of the current detectors 5A and 5B are mathematically processed to produce an exciting current component of a transformer 3. The exciting current component is mathematically processed to produce a flux density contained DC component. Further, the flux density contained DC component and a flux density contained DC component command value are mathematically processed to produce a voltage command correction value.
    Type: Grant
    Filed: August 7, 1997
    Date of Patent: February 2, 1999
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Fuminori Nakamura, Shinzo Tamai, Sadao Funahashi