Patents by Inventor Yasuaki Ootera

Yasuaki Ootera 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 recording medium, information recording method, and information reproducing method
    Patent number: 7995442
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer.
    Type: Grant
    Filed: April 5, 2010
    Date of Patent: August 9, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Takazawa, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • STORAGE MEDIUM, REPRODUCING METHOD, AND RECORDING METHOD
    Publication number: 20110141872
    Abstract: According to one embodiment, a write-once type information storage medium comprises a recording layer which is formed by mixing a plurality of organic dye based recording materials whose molecular weights are different from each other, and wherein a mixture ratio of organic dye based recording materials whose molecular weight is small is larger than a mixture ratio of organic dye based recording materials whose molecular weight is large.
    Type: Application
    Filed: February 23, 2011
    Publication date: June 16, 2011
    Inventors: Hideo ANDO, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • Storage medium, reproducing method, and recording method
    Patent number: 7960093
    Abstract: According to one embodiment, a write-once type information storage medium using a recording material which has a low to high characteristic that a light reflectivity in a recording mark increases with respect to a non-recording area and which has a recording characteristic in accordance with a principle of recording without substrate deformation, wherein the recording material includes at least an organic metal complex, and wherein the organic metal complex includes a center metal.
    Type: Grant
    Filed: January 15, 2009
    Date of Patent: June 14, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideo Ando, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • MULTI-LAYER OPTICAL DISC, INFORMATION RECORDING METHOD AND INFORMATION REPRODUCING METHOD
    Publication number: 20110085434
    Abstract: According to one embodiment, single-sided dual-layer recordable disc 100 may be used. Information recording is performed by forming mark and space portions on data area DA using modulated laser power. Pp denotes the maximum laser power or peak power for forming the mark portion, and Pb denotes the bias power for forming the space portion. Power ratio Pb/Pp is calculated for each of recording layers L0 and L1. Information is recorded on any of the recording layers L0 and L1 based on the result of calculation. Here, the calculated power ratio Pb/Pp changes among the recording layers L0 and L1, thereby optimizing the recording condition for a multi-layer recordable optical disc within relatively short time.
    Type: Application
    Filed: December 20, 2010
    Publication date: April 14, 2011
    Inventors: Kazuyo UMEZAWA, Seiji Morita, Koji Takazawa, Hideo Ando, Yasuaki Ootera, Naomasa Nakamura, Naoki Morishita
  • OPTICAL RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCING METHOD
    Publication number: 20110075548
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the first light reflecting layer is smaller than the thickness of the second light reflecting layer.
    Type: Application
    Filed: December 6, 2010
    Publication date: March 31, 2011
    Inventors: Koji TAKAZAWA, Seiji MORITA, Kazuyo UMEZAWA, Naoki MORISHITA, Yasuaki OOTERA, Hideo ANDO, Naomasa NAKAMURA
  • Storage medium, reproducing method, and recording method
    Patent number: 7914969
    Abstract: According to one embodiment, a write-once type information storage medium comprises a recording layer which is formed by mixing a plurality of organic dye based recording materials whose molecular weights are different from each other, and wherein a mixture ratio of organic dye based recording materials whose molecular weight is small is larger than a mixture ratio of organic dye based recording materials whose molecular weight is large.
    Type: Grant
    Filed: April 13, 2006
    Date of Patent: March 29, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideo Ando, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • Multi-layer optical disc, information recording method and information reproducing method
    Patent number: 7869339
    Abstract: According to one embodiment, single-sided dual-layer recordable disc 100 may be used. Information recording is performed by forming mark and space portions on data area DA using modulated laser power. Pp denotes the maximum laser power or peak power for forming the mark portion, and Pb denotes the bias power for forming the space portion. Power ratio Pb/Pp is calculated for each of recording layers L0 and L1. Information is recorded on any of the recording layers L0 and L1 based on the result of calculation. Here, the calculated power ratio Pb/Pp changes among the recording layers L0 and L1, thereby optimizing the recording condition for a multi-layer recordable optical disc within relatively short time.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: January 11, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuyo Umezawa, Seiji Morita, Koji Takazawa, Hideo Ando, Yasuaki Ootera, Naomasa Nakamura, Naoki Morishita
  • Optical recording medium, information recording method, and information reproducing method
    Patent number: 7864654
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the first light reflecting layer is smaller than the thickness of the second light reflecting layer.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: January 4, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Takazawa, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • STORAGE MEDIUM, REPRODUCING METHOD, AND RECORDING METHOD
    Publication number: 20100329099
    Abstract: According to an embodiment, a storage medium includes a transparent resin substrate having a concentric or spiral groove and a recording film formed on the groove on the transparent resin substrate, a recording mark being formed by irradiation of a laser beam, wherein a reproduction durability count in a case where reproduction is continuously carried out by a laser beam is 1,000,000 or more.
    Type: Application
    Filed: August 31, 2010
    Publication date: December 30, 2010
    Inventors: SEIJI MORITA, Koji Takazawa, Kazuyo Umezawa, Hideo Ando, Yasuaki Ootera, Naoki Morishita, Naomasa Nakamura
  • STORAGE MEDIUM, REPRODUCING METHOD, AND RECORDING METHOD
    Publication number: 20100309772
    Abstract: According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a maximum absorption wavelength in the vicinity of 405 nm is defined as 1, the absorbance is 5% or more at any wavelength in the range of 600 nm to 700 nm.
    Type: Application
    Filed: July 28, 2010
    Publication date: December 9, 2010
    Inventors: Hideo ANDO, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • STORAGE MEDIUM, REPRODUCING METHOD, AND RECORDING METHOD
    Publication number: 20100302926
    Abstract: According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a maximum absorption wavelength in the vicinity of 405 nm is defined as 1, the absorbance is 5% or more at any wavelength in the range of 600 nm to 700 nm.
    Type: Application
    Filed: August 13, 2010
    Publication date: December 2, 2010
    Inventors: Hideo ANDO, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • STORAGE MEDIUM, REPRODUCING METHOD, AND RECORDING METHOD
    Publication number: 20100290327
    Abstract: According to one embodiment, a write-once type information storage medium comprises an organic dye based recording material having sensitivity at a wavelength of 405 nm and at a recording wavelength in the range of 600 nm to 700 nm, wherein, when absorbance of a maximum absorption wavelength in the vicinity of 405 nm is defined as 1, the absorbance is 5% or more at any wavelength in the range of 600 nm to 700 nm.
    Type: Application
    Filed: July 28, 2010
    Publication date: November 18, 2010
    Inventors: Hideo ANDO, Seiji Morita, Koji Takazawa, Yasuaki Ootera, Naoki Morishita, Kazuyo Umezawa
  • METHOD FOR MANUFACTURING STAMPER
    Publication number: 20100258523
    Abstract: According to one embodiment, an injection-molded recess and protrusion pattern surface of a resin stamper is subjected to a dry etching process for surface treatment.
    Type: Application
    Filed: April 7, 2010
    Publication date: October 14, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasuaki Ootera, Masatoshi SAKURAI
  • RESIN STAMPER MOLDING DIE AND METHOD FOR MANUFACTURING RESIN STAMPER USING THE SAME
    Publication number: 20100213642
    Abstract: According to one embodiment, the present invention provides a resin stamper injection molding die including a fixed side template having a metal stamper mounting surface mirror-ground in a random direction, a metal stamper having a front surface with recesses and protrusions and a back surface mirror-ground in a random direction, and a moving side template. The metal stamper has a surface roughness of 0 to 50 nm. The metal stamper mounting surface has a surface roughness of 0 to 1.0 nm, and has a coefficient of static friction of at most 0.20 with respect to the second main surface of the metal stamper.
    Type: Application
    Filed: February 19, 2010
    Publication date: August 26, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasuaki Ootera, Shinobu Sugimura, Seiji Morita, Masatoshi Sakurai
  • STAMPER MOLDING DIE AND METHOD FOR MOLDING STAMPER USING THE SAME
    Publication number: 20100207302
    Abstract: According to one embodiment, in a die for manufacturing a resin stamper, the following are defined the sizes of a resin injection hole and a cut punch receiving portion of a fixed-side template, areas in which a vacuum suction hole and an air-blow hole, respectively, are formed, the diameter of a cut punch on a moving-side template, and the taper angle of the peripheral portion of a cavity.
    Type: Application
    Filed: February 19, 2010
    Publication date: August 19, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasuaki OOTERA, Shinobu SUGIMURA, Seiji MORITA, Masatoshi SAKURAI
  • Optical recording medium, information recording method, and information reproducing method
    Patent number: 7778144
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the first light reflecting layer is smaller than the thickness of the second light reflecting layer.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: August 17, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Takazawa, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • OPTICAL RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCING METHOD
    Publication number: 20100188963
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer.
    Type: Application
    Filed: April 5, 2010
    Publication date: July 29, 2010
    Inventors: Koji TAKAZAWA, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • Optical recording medium, information recording method, and information reproducing method
    Patent number: 7715304
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the second light reflecting layer is larger than the thickness of the first light reflecting layer.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: May 11, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Koji Takazawa, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • OPTICAL RECORDING MEDIUM, INFORMATION RECORDING METHOD, AND INFORMATION REPRODUCING METHOD
    Publication number: 20100110868
    Abstract: According to one embodiment, an optical recording medium is provided in which interlayer crosstalk is low and in which stable and high-quality recording characteristics can be obtained. To this end, an optical recording medium comprises a first recording part which includes a first recording layer and a first light reflecting layer and which is disposed on a side closer to a light receiving surface, and a second recording part which includes a second recording layer and a second light reflecting layer and which is disposed on a side farther from the light receiving surface, the first recording part and the second recording part being stacked, wherein the thickness of the first light reflecting layer is smaller than the thickness of the second light reflecting layer.
    Type: Application
    Filed: December 18, 2009
    Publication date: May 6, 2010
    Inventors: Koji TAKAZAWA, Seiji Morita, Kazuyo Umezawa, Naoki Morishita, Yasuaki Ootera, Hideo Ando, Naomasa Nakamura
  • Phase-change optical recording media and optical recording-reproducing apparatus
    Patent number: 7643397
    Abstract: The present invention relates to an optical recording media including two or more information layers, at least one of the information layers including a writable recording film. In the optical recording media, at least one information layer has protrusions and recesses that permit tracking and at least another one information layer is substantially flat.
    Type: Grant
    Filed: September 13, 2005
    Date of Patent: January 5, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tsukasa Nakai, Yasuaki Ootera, Sumio Ashida, Keiichiro Yusu, Nobuhisa Yoshida, Koji Takazawa, Naomasa Nakamura