Patents by Inventor Masayuki Tamura

Masayuki Tamura 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).

  • Publication number: 20110196904
    Abstract: Disclosed herein is an information recording apparatus including: a loading section configured to be loaded with a recording medium for managing a file on the basis of at least one of an FAT file system and a file system similar thereto; and a control section configured, in updating at least one directory entry recorded to an area in a second and subsequent clusters in a recording area of directory entries in a predetermined directory in the recording medium, to read data, update at least the one directory entry, record the updated data, and update the FAT of the recording medium and management information similar to the FAT such that the area in which the updated data of the area in the second and subsequent clusters is recorded is linked to the area in a first cluster of the recording area in the predetermined directory.
    Type: Application
    Filed: February 3, 2011
    Publication date: August 11, 2011
    Inventors: Masashi KISHIKAWA, Masayuki Tamura, Tsutomu Shimosato, Yuichi Motomura, Hisao Tanaka
  • Publication number: 20110164346
    Abstract: A dielectric ceramic composition comprises a main component composed of at least one selected from BaTiO3, (Ba, Ca)TiO3, (Ba, Sr)TiO3 and (Ba, Ca, Sr)TiO3, an oxide of rare earth element and a composite compound including Ba. 9 to 13 mol of the composite compound in terms of composite compound is included in the dielectric composition. The dielectric ceramic composition includes surface diffusion particles having surface diffusion structure composed of non diffusion phase and diffusion phase including rare earth element. In the surface diffusion particle, when an area of the non diffusion phase is defined as S1, an area of the diffusion phase is defined as S2, S1 and S2 satisfy a relation of S1:S2=20:80 to 30:70 (Note that, except S1=30 and S2=70) , when an average concentration of the rare earth element in the surface diffusion particle is defined as C, S2 and C satisfy a relation of 4.8?S2×C?5.8.
    Type: Application
    Filed: December 27, 2010
    Publication date: July 7, 2011
    Applicant: TDK CORPORATION
    Inventors: Masayuki TAMURA, Satoshi TAKAGI, Dan SAKURAI, Sanshiro AMAN, Yuki KAMADA
  • Publication number: 20070149329
    Abstract: A sliding member used in a chain system of an automotive internal combustion engine and made of a resin composition. The resin composition includes a matrix resin which is a thermoplastic resin having a number average molecular weight of not less than 20000; and a fluororesin in an amount ranging from 5 to 40% by mass based on a total amount of the resin composition, the fluororesin having a surface energy ranging from 200 to 400 ?N/cm and a visible light transmittance of not less than 10% at a wavelength of 600 nm.
    Type: Application
    Filed: December 26, 2006
    Publication date: June 28, 2007
    Inventors: Tomohito Ota, Hiroshi Kumagai, Hiroyuki Taniai, Masayuki Tamura, Sadahiko Yamaguchi, Hiroo Kusano, Yasuaki Yamamoto
  • Patent number: 7049734
    Abstract: A spark plug is provided which is constructed to ensure a higher degree of air-tightness. The spark plug includes a cylindrical metal housing within which an insulation porcelain is disposed. The housing has a hexagon head formed on an outer wall thereof and an annular chamber defined between itself and the insulation porcelain within which a sealing powder is disposed. The housing has an annular extension formed on the hexagon head. The annular extension is crimped inward to compress the sealing powder to enhance the air-tightness between the housing and the insulation porcelain. The annular extension has featured dimensions in order to ensure a desired degree of the air-tightness.
    Type: Grant
    Filed: July 21, 2004
    Date of Patent: May 23, 2006
    Assignee: Denso Corporation
    Inventor: Masayuki Tamura
  • Patent number: 6917573
    Abstract: Multi-drive optical disk apparatus and a method and a label for easily confirming the respective performance characteristics for the different kinds of optical disks are provided. The respective performances, such as a data transfer rate are indicated by multiple-fold speed forms, respectively. The performance indication label is affixed on one surface of the optical disk drive. The performance indication label is constructed by arranging an indication for a data reading performance from a CD-ROM disk and a DVD-ROM disk, an indication for a data writing performance to a CD-RW disk, a DVD-RAM disk, a DVD-RW disk, a DVD-R disk, and a CD-R disk, and an indication for a data writing and reading performances to and from a DVD-RAM disk in a hypothetical circle.
    Type: Grant
    Filed: February 19, 2003
    Date of Patent: July 12, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hironori Nakajo, Masayuki Tamura
  • Publication number: 20050017622
    Abstract: A spark plug is provided which is constructed to ensure a higher degree of air-tightness. The spark plug includes a cylindrical metal housing within which an insulation porcelain is disposed. The housing has a hexagon head formed on an outer wall thereof and an annular chamber defined between itself and the insulation porcelain within which a sealing powder is disposed. The housing has an annular extension formed on the hexagon head. The annular extension is crimped inward to compress the sealing powder to enhance the air-tightness between the housing and the insulation porcelain. The annular extension has featured dimensions in order to ensure a desired degree of the air-tightness.
    Type: Application
    Filed: July 21, 2004
    Publication date: January 27, 2005
    Applicant: DENSO CORPORATION
    Inventor: Masayuki Tamura
  • Patent number: 6819019
    Abstract: A rotation detecting device which detects the rotational state of a rotary shaft, is structured to be a device in which the number of parts is small, and the incorporation is simple. The structure is such that a long holder receiving part is formed on the channel back side in an opening part of a motor shaft case body of a casing which contains a reduction mechanism part, and a sensor holder in which a hall device, the rotation detecting device, is incorporated, is slid in the longitudinal direction of the motor shaft, and is incorporated in the holder receiving part in the lightly pressed state, similarly to the incorporation of the motor shaft.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: November 16, 2004
    Assignee: Mitsuba Corporation
    Inventors: Masayuki Tamura, Isao Abe, Yuji Hagiwara
  • Patent number: 6819033
    Abstract: A spark plug comprises a main metal fitting, a center electrode mounted to and held by the main metal fitting in a manner insulated therefrom and a grounding electrode having one end welded to the main metal fitting and another end opposing to the center electrode. A welding burr is further formed to the welded portion of the main metal fitting and the grounding electrode so as to have an area expanding outside the grounding electrode, and the main metal fitting of the main metal fitting is plated, whereas the grounding electrode and the welding burr are not plated.
    Type: Grant
    Filed: August 6, 2002
    Date of Patent: November 16, 2004
    Assignee: Denso Corporation
    Inventors: Keiji Kanao, Masayuki Tamura
  • Publication number: 20040071075
    Abstract: Multi-drive optical disk apparatus and a method and a label for easily confirming the respective performance characteristics for the different kinds of optical disks are provided. The respective performances, such as a data transfer rate are indicated by multiple-fold speed forms, respectively. The performance indication label is affixed on one surface of the optical disk drive. The performance indication label is constructed by arranging an indication for a data reading performance from a CD-ROM disk and a DVD-ROM disk, an indication for a data writing performance to a CD-RW disk, a DVD-RAM disk, a DVD-RW disk, a DVD-R disk, and a CD-R disk, and an indication for a data writing and reading performances to and from a DVD-RAM disk in a hypothetical circle.
    Type: Application
    Filed: February 19, 2003
    Publication date: April 15, 2004
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hironori Nakajo, Masayuki Tamura
  • Publication number: 20030164652
    Abstract: When providing a rotation detecting device which detects the rotational state of a rotary shaft, it is constructed to be a device in which the number of parts is small, and the incorporation is simple.
    Type: Application
    Filed: February 4, 2002
    Publication date: September 4, 2003
    Inventors: Masayuki Tamura, Isao Abe, Yuji Hagiwara
  • Patent number: 6548945
    Abstract: A spark plug has a tubular fitting which is assembled with a center electrode, a ground electrode and an insulator. The fitting has a reach length of at least 12 mm for use in high output-type engines. The fitting is formed with a thread part and a taper part so that the fitting is thread engaged with an engine head and seals a combustion chamber from an outside by a contact between the taper part and a seat surface of the engine head. The fitting is made by cold-forging a low carbon steel to provide the taper surface of a surface roughness of less than 10 &mgr;m and a column part. The column part is machine-cut to provide the thread part thereon. The deflection between the axes of the thread part and the taper part is limited to be less than 0.15 mm.
    Type: Grant
    Filed: October 20, 2000
    Date of Patent: April 15, 2003
    Assignee: Denso Corporation
    Inventor: Masayuki Tamura
  • Publication number: 20030038578
    Abstract: A spark plug comprises a main metal fitting, a center electrode mounted to and held by the main metal fitting in a manner insulated therefrom and a grounding electrode having one end welded to the main metal fitting and another end opposing to the center electrode. A welding burr is further formed to the welded portion of the main metal fitting and the grounding electrode so as to have an area expanding outside the grounding electrode, and the main metal fitting of the main metal fitting is plated, whereas the grounding electrode and the welding burr are not plated.
    Type: Application
    Filed: August 6, 2002
    Publication date: February 27, 2003
    Inventors: Keiji Kanao, Masayuki Tamura
  • Patent number: 6408572
    Abstract: A cable driving device for use in a window regulator is made simple in structure and is reduced in weight and size. When a worm wheel 6 to which motor power is transmitted, a damper 8 for absorbing shock, and a drum 7 wound with wires 9 for opening and closing a window glass are assembled into a casing 4 integrally formed with a front bracket 3, damper bodies 8a, 8b are fitted into cavities 6d formed through the worm wheel 6 with a gap S interposed therebetween, and tongues 8c extending downwardly from the lower surface of damper 8 are fitted into the gaps S, to form a damper mechanism within the thickness of the worm wheel.
    Type: Grant
    Filed: June 2, 2000
    Date of Patent: June 25, 2002
    Assignee: Mitsuba Corporation
    Inventors: Hiroyuki Uchimura, Masayuki Tamura, Nobuo Kobayashi
  • Patent number: 6203912
    Abstract: An electronic article having a thin film of a triazine ring-containing fluoropolymer obtained by trimerization of a cyano group of a cyano group-containing fluoropolymer having a polymerization unit of the formula (1): —[CF2—CF(A1)]—  (1) wherein A1 is —OR1CN, —CN or —R1CN, and R1 is a C1-C15 polyfluoroalkylene group which may have an ether bond.
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: March 20, 2001
    Assignee: Asahi Glass Company. Ltd.
    Inventors: Atsushi Watakabe, Jun-ichi Tayanagi, Masayuki Tamura, Haruhisa Miyake
  • Patent number: 6178145
    Abstract: A focus servo control system is a system for selectively applying a light beam to a disk on which data is recorded on plurally layered recording surfaces and setting the focus position of the light beam on a selected recording surface of the two-layered recording surfaces based on a signal read from reflected light from the selected recording surface of the plurally layered recording surfaces of the disk and includes a focus error detector for detecting a positional difference between the focus position of the light beam and the selected recording surface of the plurally layered recording surfaces, a sample-hold circuit for sampling and holding an output of the focus error detector, a focus position correcting circuit for correcting the focus position of the light beam based on one of the output of the focus error detector and an output of the sample-hold circuit, a data signal level detector for detecting the signal level relating to data read out from the disk, a comparator for comparing a signal level dete
    Type: Grant
    Filed: November 25, 1998
    Date of Patent: January 23, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yasuhiro Hayashi, Masayuki Tamura, Satoru Maeda
  • Patent number: 6166125
    Abstract: A graded-refractive-index optical plastic material comprising an amorphous fluorine-containing polymer (A) having substantially no C--H bond, and at least one fluorine-containing polycyclic compound (B) having a refractive index higher by at least 0.
    Type: Grant
    Filed: October 1, 1998
    Date of Patent: December 26, 2000
    Assignee: Asahi Glass Company Ltd.
    Inventors: Norihide Sugiyama, Hidenobu Murofushi, Takashi Okazoe, Masayuki Tamura, Shin Tatematsu, Jun Irisawa
  • Patent number: 5974009
    Abstract: In making a layer jump or focus search on a multilayer optical disk having two or more signal recorded layers, an objective lens is moved in a focusing direction to focus a laser beam onto a desired signal recorded layer with focus servo kept OFF. Based on the number of times a focus error signal having an S-shaped characteristic obtained as a result of driving the objective lens exceeds a predetermined voltage level, arrival at the desired signal recorded layer is determined. In this state, the focus servo is made active at the time when the focus error signal first goes to the 0 level.
    Type: Grant
    Filed: October 28, 1997
    Date of Patent: October 26, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Tamura, You Yoshioka
  • Patent number: 5938209
    Abstract: A seal system for a pressure vessel which includes a substantially rigid outer shell with at least one opening therein, an inner liner disposed within the outer shell against the inside surface thereof, an opening aligned with the opening of the outer shell and a boss disposed in the opening of the outer shell. The boss includes a neck portion for fitting in the opening of the outer shell, a flange portion extending outwardly from one end of the neck portion and having an upper surface and a lower surface, and a generally cylindrical hollow substantially aligned with the outer shell opening and having an inwardly projecting annular shoulder. The lip segment of the liner extends radially inwardly under the lower surface of the flange portion of the boss and then upwardly into the hollow of the boss, along the interior wall of the hollow until a portion of the lip segment rests on the shoulder.
    Type: Grant
    Filed: February 14, 1997
    Date of Patent: August 17, 1999
    Assignees: Alternative Fuel Systems, Inc., Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Sadanandan Neel Sirosh, Hans C. Van Oyen, Masayuki Tamura, Kazutaka Yokoyama, Hajime Endo
  • Patent number: 5869746
    Abstract: In a motorcar having a compressed fuel cylinder charged with a compressed fuel disposed in a compartment, pipes connected to the fuel cylinder within the compartment are connected to a joint unit penetrating a partition wall partitioning the compartment from an outside and the joint unit is connected to pipes connected to an internal combustion engine and the like out of the compartment. A fuel charge passage, a fuel supply passage and a relief passage in a cylinder cap of the fuel cylinder and a fuel charge passage, a fuel supply passage and a relief passage in an interior side of the joint unit are connected with each other through an interior charge pipe, and interior supply pipe and an interior fuel relief pipe, respectively. A fuel charge pipe, a fuel supply pipe and a relief pipe out of the compartment are connected to a fuel charge passage, a fuel supply passage and a relief passage in an exterior side of the joint unit.
    Type: Grant
    Filed: April 24, 1997
    Date of Patent: February 9, 1999
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Hideo Watanabe, Tooru Ogawa, Akifumi Ohtaka, Masayuki Tamura, Yutaka Kanaguchi
  • Patent number: D482073
    Type: Grant
    Filed: January 8, 2003
    Date of Patent: November 11, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hironori Nakajo, Masayuki Tamura