Patents by Inventor Shigeru Nakamura

Shigeru 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).

  • Optical detector having three light receiving areas
    Patent number: 6721242
    Abstract: An optical detector for detecting at least three optical beams reflected by an optical information recording medium and outputting an electric signal, the optical detector having three light receiving areas each of which receives a respective one of the three optical beams and each of which has four light receiving surfaces, twelve signal lines to transmit an electric signal obtained on respective ones of the four light receiving surfaces of the three light receiving areas, selected ones of the twelve signal lines connected to the four light receiving surfaces of different ones of the three light receiving areas being joined together within the optical detector, and less than nine signal output lines formed by joining the selected ones of the twelve signal lines extend from the optical detector to a signal processing circuit.
    Type: Grant
    Filed: May 13, 2002
    Date of Patent: April 13, 2004
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.
    Inventors: Kunikazu Ohnishi, Takeshi Shimano, Shigeru Nakamura, Masayuki Inoue, Yukio Fukui, Yasuyuki Sugi, Shinji Fujita, Mitsuhiko Ota
  • Optical information reproducing method for reproducing information by generating a signal representing a center of a mark
    Patent number: 6717898
    Abstract: An optical information reproducing method for reproducing information recorded at at least one mark on an optical information medium. The method includes irradiating a laser to the optical information medium, detecting a reflected beam reflected from the optical information medium, and reproducing information recorded on the optical information medium from an output signal of a detector which detects the reflected beam. The step of reproducing information is changed in dependence upon a length of the mark of the optical information medium.
    Type: Grant
    Filed: May 13, 2003
    Date of Patent: April 6, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Nakamura, Takeshi Maeda, Koichiro Wakabayashi
  • Method and apparatus for optical head and optical information reproducing
    Patent number: 6714506
    Abstract: An optical head for reproducing information contained on an optical information disk includes a plurality of light sources and a plurality of light receiving elements in correspondence with the plurality of laser light sources. There is constructed a constitution in which one laser light source in the plurality of laser light sources is constituted by an individual laser diode and which includes a laser module constituted by other laser light sources and the plurality of light receiving elements to thereby enable to realize the small size of the optical head.
    Type: Grant
    Filed: August 22, 2000
    Date of Patent: March 30, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Kouji Arikawa, Shigeru Nakamura, Kazuo Shigematsu
  • Optical head and optical information media recording/reproduction apparatus using the same
    Publication number: 20040022141
    Abstract: An optical head with a plurality of semi-conductor laser chips for use in reducing inclination or gradient of more than one beam presently falling onto a focusing lens is disclosed. To this end, a double mirror or alternatively beam reshaping means is disposed which has different reflection planes for permitting reflection of a plurality of laser beams incoming from the semiconductor laser chips.
    Type: Application
    Filed: July 29, 2003
    Publication date: February 5, 2004
    Applicant: Hitachi, Ltd.
    Inventors: Shigeru Nakamura, Takeshi Shimano, Kazuo Shigematsu
  • Accelerometer and spherical sensor type measuring instrument
    Patent number: 6679118
    Abstract: An object is to provide an accelerometer or a spherical sensor-type measurement device, able to control by means of an active restraining control system a spherical mass part or a spherical sensor part. The accelerometer or spherical sensor-type measurement device has a spherical mass part, which is levitated by electrostatic supporting forces, and electrodes positioned so as to surround the spherical mass part and which have spherical inner surfaces; the above electrodes include a plurality of electrostatic supporting electrodes, positioned symmetrically with respect to the spherical mass part, and a displacement detection electrode, positioned between the electrostatic supporting electrodes.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: January 20, 2004
    Assignees: Tokimec Inc., Ball Semiconductor Limited
    Inventors: Masayoshi Esashi, Takao Murakoshi, Shigeru Nakamura, Nobuo Takeda
  • Information recording/reproducing apparatus and method and information recording medium
    Patent number: 6680888
    Abstract: An information recording/reproducing apparatus includes a detector circuit for detecting a state of reflection light from the recording medium, a control circuit for calculating a radiation power used for writing the information in the recording medium, in accordance with the reflection light state, a pulse generator circuit for generating record pulse information in accordance with the radiation power, and an optical driver circuit for converting the record pulse information into optical information in accordance with the radiation power and driving the optical head to record the light information into the recording medium. Accordingly, the apparatus records information by applying light from an optical head to a record area of a recording medium and changing a state of the record area and reads the information recorded in the record area.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: January 20, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Tsuyoshi Toda, Shigeru Nakamura, Takeshi Maeda
  • Information recording/reproducing apparatus and method and information recording medium
    Patent number: 6671239
    Abstract: An information recording/reproducing apparatus for overwriting information by applying light from an optical head to a record area and a space of a rewritable recording medium and changing a state of the record area and for reading the information recorded in the record area. The apparatus includes a detector circuit for detecting a state of the record area and the space where information is already recorded by detecting a reflection light while recording information thereon by overwriting, a control circuit for calculating a radiation power used for recording the information and for forming the space on the record area so as to overwrite where information is already recorded in the recording medium, in accordance with the detected reflection light, a pulse generator circuit, and an optical driver circuit.
    Type: Grant
    Filed: August 8, 2002
    Date of Patent: December 30, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Tsuyoshi Toda, Shigeru Nakamura, Takeshi Maeda
  • Automobile body-coating method
    Publication number: 20030201182
    Abstract: An automobile body-coating method which comprises optionally subjecting an aluminum material in the automobile body to a surface treatment, followed by subjecting to an oxidizing film treatment, essentially or optionally, respectively and successively forming a curable electrodeposition coating film, a water based chipping primer coating film, an intercoat coating film, and a curable topcoat coating film, or comprises applying a film racing material onto an aluminum material or coating film-coated aluminum material, and comprises forming respective multi-layer coating films onto the steel material in the automobile body respectively.
    Type: Application
    Filed: February 28, 2003
    Publication date: October 30, 2003
    Inventors: Shigeru Nakamura, Hideo Sugai
  • Optical information reproducing method
    Publication number: 20030193860
    Abstract: An optical information reproducing method for reproducing information recorded at at least one mark on an optical information medium. The method includes irradiating a laser to the optical information medium, detecting a reflected beam reflected from the optical information medium, and reproducing information recorded on the optical information medium from an output signal of a detector which detects the reflected beam. The step of reproducing information is changed in dependence upon a length of the mark of the optical information medium.
    Type: Application
    Filed: May 13, 2003
    Publication date: October 16, 2003
    Inventors: Shigeru Nakamura, Takeshi Maeda, Koichiro Wakabayashi
  • High toughness steel material and method of producing steel pipes using same
    Publication number: 20030178111
    Abstract: A steel material and a steel pipe made by using the same are provided which are to be used in severe oil well environments. Such a highly tough oil well steel pipe can be produced by rolling the base material, quenching the rolling product from the austenite region and tempering the same so that the relationship between the content of Mo [Mo] in the carbides precipitated at austenite grain boundaries and the austenite grain size (according to ASTM E 112) can be defined by the formula (a) given below. In this manner, steel pipes suited for use even under oil well environments becoming more and more severe can be produced while satisfying the requirements that the cost should be rationalized, the productivity improved and energy saved.
    Type: Application
    Filed: April 22, 2003
    Publication date: September 25, 2003
    Inventors: Shigeru Nakamura, Kaori Kawano, Tomohiko Omura, Toshiharu Abe
  • Light-emitting element and method of producing the same
    Publication number: 20030160260
    Abstract: A light-emitting element comprising a transparent electrode, a light-emitting layer, and a back electrode, on a substrate, wherein the light-emitting layer comprises photoluminescent metal oxide nanoparticles having an average particle size of 1 to 50 nm; and a method of producing the same.
    Type: Application
    Filed: February 28, 2003
    Publication date: August 28, 2003
    Applicant: Fuji Photo Film Co., Ltd.
    Inventors: Hiroyuki Hirai, Hiroshi Fujimoto, Shigeru Nakamura
  • Electronic device and a method of manufacturing the same
    Publication number: 20030135996
    Abstract: A method of manufacturing an electronic device including a first electronic component mounted on one main surface of a wiring board by being thermo-compression bonded by means of a thermo-compression bonding tool with an adhesive resin interposed between a first area of the one main surface of the wiring board and the first electronic component, and a second electronic component mounted on a second area different from the first area of the one main surface of the wiring board by melting a soldering paste material and higher than the first electronic component in post-mounting height, and wherein the first electronic component is mounted before the mounting of the second electronic component.
    Type: Application
    Filed: February 4, 2003
    Publication date: July 24, 2003
    Applicant: Hitachi, Ltd.
    Inventor: Shigeru Nakamura
  • Optical information reproducing method in which either a first edge signal or a second edge signal is selected depending on a length of a mark on an optical information medium
    Patent number: 6577573
    Abstract: An optical information reproducing method for reproducing information recorded at at least one mark on an optical information medium. The method includes irradiating a laser to the optical information medium, detecting a reflected beam reflected from the optical information medium, and reproducing information recorded on the optical information medium from an output signal of a detector which detects the reflected beam. The step of reproducing information is changed in dependence upon a length of the mark of the optical information medium.
    Type: Grant
    Filed: May 15, 2002
    Date of Patent: June 10, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Nakamura, Takeshi Maeda, Koichiro Wakabayashi
  • Electronic device and a method of manufacturing the same
    Patent number: 6553660
    Abstract: A method of manufacturing an electronic device including a first electronic component mounted on one main surface of a wiring board by being thermo-compression bonded by means of a thermo-compression bonding tool with an adhesive resin interposed between a first area of the one main surface of the wiring board and the first electronic component, and a second electronic component mounted on a second area different from the first area of the one main surface of the wiring board by melting a soldering paste material and higher than the first electronic component in post-mounting height, and wherein the first electronic component is mounted before the mounting of the second electronic component.
    Type: Grant
    Filed: August 23, 2001
    Date of Patent: April 29, 2003
    Assignees: Hitachi, Ltd., Hitachi Hokkai Semiconductor, Ltd.
    Inventor: Shigeru Nakamura
  • Optical detector, signal processing circuit and optical information reproduction apparatus thereof
    Patent number: 6507009
    Abstract: It is desirable to greatly reduce the disturbance that arises in a focusing error signal by a astigmatic detection method and offset that arises in the tracking error signal by a push-pull method when reproducing various information storing disks, such as a DVD-RAM disk. It is also desirable to provide an optical disk apparatus which is able to reproduce a variety of high density optical disks, such as DVD-RAM and DVD-ROM disks, as well as conventional disks, such as CD, CD-ROM, CD-R disks, by using a simple optional head. For this purpose, an optical disk apparatus irradiates three optical beams produced by a diffraction grating on the specified position of an optical disk and detects reflected light using a specified optical detector divided into twelve parts.
    Type: Grant
    Filed: July 6, 1999
    Date of Patent: January 14, 2003
    Assignees: Hitachi, Ltd., Hitachi Media Electronics Co., Ltd.
    Inventors: Kunikazu Ohnishi, Takeshi Shimano, Shigeru Nakamura, Masayuki Inoue, Yukio Fukui, Yasuyuki Sugi, Shinji Fujita, Mitsuhiko Ota
  • Semiconductor nonlinear waveguide and optical switch
    Patent number: 6498885
    Abstract: Concerning an all-optical switch which makes use of a nonlinear change of a refractive index of a nonlinear waveguide caused by absorption of a control light, a method that an electrostatic field is applied to the nonlinear waveguide is known as an effective one for shortening a lifetime of the carrier which obstructs an improvement of a repetition frequency of a switching operation. The semiconductor nonlinear waveguide is constituted of a pin-structure which comprises a nondoped InGaAsP optical waveguide, an under cladding layer formed of a N-type InP substrate and an upper cladding layer formed of a p-type InP layer and etc. Moreover, the under and upper cladding layers are electrically shortcircuited via upper and lower electrodes.
    Type: Grant
    Filed: August 5, 1999
    Date of Patent: December 24, 2002
    Assignee: NEC Corporation
    Inventors: Shigeru Nakamura, Kazuhito Tajima
  • Information recording/reproducing apparatus and method and information recording medium
    Publication number: 20020191511
    Abstract: An information recording/reproducing apparatus for overwriting information by applying light from an optical head to a record area and a space of a rewritable recording medium and changing a state of the record area and for reading the information recorded in the record area. The apparatus includes a detector circuit for detecting a state of the record area and the space where information is already recorded by detecting a reflection light while recording information thereon by overwriting, a control circuit for calculating a radiation power used for recording the information and for forming the space on the record area so as to overwrite where information is already recorded in the recording medium, in accordance with the detected reflection light, a pulse generator circuit, and an optical driver circuit.
    Type: Application
    Filed: August 8, 2002
    Publication date: December 19, 2002
    Inventors: Tsuyoshi Toda, Shigeru Nakamura, Takeshi Maeda
  • Perfusate preparation for ophthalmic operation
    Patent number: 6495598
    Abstract: A one-pack preparation of irrigating solution for ocular surgery of cataract, glaucoma or intraocular lens transplantation, which is excellent in the protection of ophthalmic tissues and endothelial cells during and after the operation and has a high in vivo stability. The preparation comprises an aqueous solution containing at least one compound selected from D-3-hydroxybutyric acid and water-soluble salts thereof, at least one compound selected from water-soluble bicarbonates, phosphoric acid and water-soluble phosphates, a water-soluble calcium salt, and a water-soluble magnesium salt.
    Type: Grant
    Filed: April 18, 2001
    Date of Patent: December 17, 2002
    Assignee: Ophtecs Corporation
    Inventors: Toyoaki Yoneda, Nobuhisa Naoi, Hiroaki Miichi, Shigeru Nakamura, Toshinao Hata, Fumio Saito, Takeshi Ohnuma
  • Objective lens and optical head for optical disc drive
    Patent number: 6487161
    Abstract: An optical head for an optical disc drive is provided with a first laser diode that emits a shorter wavelength laser beam, a second laser diode that emits a longer wavelength laser beam, and an objective lens for converging the beams emitted by the laser diodes on the data recording surface of the optical disc. Each of first and second surfaces of the objective lens is rotationally symmetrical, and a rotational axis of the first surface and a rotational axis of the second surface are arranged to be deviated from each other.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: November 26, 2002
    Assignees: Hitachi, Ltd., Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Maruyama, Shigeru Nakamura
  • Optical disc drive
    Patent number: 6477129
    Abstract: An optical disc drive using either one of a first disc (e.g., DVD) and a second disc (e.g., CD), is provided with a first laser diode that emits a shorter wavelength beam, a second laser diode that emits a longer wavelength beam, an objective lens, and a driving unit that holds and rotates the optical disc. The optical axis of the objective lens is inclined relative to a normal to the optical disc. The first laser diode is located at a first position so that the coma, which is caused when the first laser beam is converged on a data recording surface of the first disc, is minimized, and the second laser diode is located at a second position so that the coma, which is caused when the second laser beam is converged on a data recording surface of the second disc, is minimized.
    Type: Grant
    Filed: February 28, 2001
    Date of Patent: November 5, 2002
    Assignees: Hitachi, Ltd., Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Koichi Maruyama, Takeshi Shimano, Shigeru Nakamura, Akira Arimoto, Kazuo Shigematsu