Patents by Inventor Naoki Kitagaki
Naoki Kitagaki 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).
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Patent number: 7768885Abstract: The reproduction durability of an optical recording medium is evaluated highly accurately in a short period of time by providing a method for evaluating the optical recording medium, the method including determining an operating laser power for heating a recording layer to a recording operating temperature; determining a temperature of the recording layer when a laser beam having a predetermined reproducing laser power is radiated during a data reproduction; determining a relationship between the reproducing laser power during the data reproduction and a reproduction durability times at the reproducing laser power; and determining a relationship between the temperature of the recording layer during the data reproduction and the reproduction durability times from the relationship between the reproducing laser power during the data reproduction and the reproduction durability times.Type: GrantFiled: March 27, 2006Date of Patent: August 3, 2010Assignee: Hitachi Maxell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto, Makoto Iimura, Satoshi Sukada
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Patent number: 7561506Abstract: An information-recording method includes the steps of moving a light beam at a selected linear velocity relative to the information-recording medium; controlling the light beam to generate a multi-pulse having at least three power levels of a first power level Ph, a second power level P1 which is lower than the first power level, and a third power level Pm which is intermediate therebetween, the multi-pulse being repeatedly modulated between the first power level Ph and the third power level Pm; adjusting the third power level Pm in response to the selected linear velocity; and recording the information by irradiating the information-recording medium with the controlled light beam. Recording compatibility can be secured for information-recording apparatuses different in recording linear velocity and laser source characteristic.Type: GrantFiled: July 7, 2005Date of Patent: July 14, 2009Assignee: Hitachi Maxell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto
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Patent number: 7477587Abstract: An information-recording method includes the steps of moving a light beam at a selected linear velocity relative to the information-recording medium; controlling the light beam to generate a multi-pulse having at least three power levels of a first power level Ph, a second power level Pl which is lower than the first power level, and a third power level Pm which is intermediate therebetween, the multi-pulse being repeatedly modulated between the first power level Ph and the third power level Pm; adjusting the third power level Pm in response to the selected linear velocity; and recording the information by irradiating the information-recording medium with the controlled light beam. Recording compatibility can be secured for information-recording apparatuses different in recording linear velocity and laser source characteristic.Type: GrantFiled: December 15, 2003Date of Patent: January 13, 2009Assignee: Hitachi Maxwell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto
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Patent number: 7190647Abstract: An information-recording method and an information-recording medium which make it possible to improve overwrite characteristics in the high speed recording, especially archival overwrite characteristics for overwriting information after retaining the medium in a high temperature environment for a certain period of time, and an information-recording apparatus based on the use of the same are provided. The information-recording method comprises overwriting a random pattern with light beams having a predetermined recording power and a variety of erasing powers; reproducing the random pattern to determine a minimum value Pb1 and a maximum value Pb2 of the erasing power obtained when the pattern, in which a reproduction jitter exceeds a predetermined threshold value, is erased; determining an optimum erasing power Pb from the minimum value Pb1, the maximum value Pb2, and a relational expression represented by Pb=?×Pb1+(1??)×Pb2; and recording the information with the determined optimum erasing power Pb.Type: GrantFiled: March 29, 2004Date of Patent: March 13, 2007Assignee: Hitachi Maxell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto, Yuji Yamazaki
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Patent number: 7154826Abstract: An information-recording method and an information-recording medium which make it possible to improve overwrite characteristics in the high speed recording, especially archival overwrite characteristics for overwriting information after retaining the medium in a high temperature environment for a certain period of time, and an information-recording apparatus based on the use of the same are provided. The information-recording method comprises overwriting a random pattern with light-beams having a predetermined recording power and a variety of erasing powers; reproducing the random pattern to determine a minimum value Pb1 and a maximum value Pb2 of the erasing power obtained when the pattern, in which a reproduction jitter exceeds a predetermined threshold value, is erased; determining an optimum erasing power Pb from the minimum value Pb1, the maximum value Pb2, and a relational expression represented by Pb=?×Pb1+(1??)×Pb2; and recording the information with the determined optimum erasing power Pb.Type: GrantFiled: July 8, 2005Date of Patent: December 26, 2006Assignee: Hitachi Maxell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto, Yuji Yamazaki
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Publication number: 20060221787Abstract: The reproduction durability of an optical recording medium is evaluated highly accurately in a short period of time by providing a method for evaluating the optical recording medium, the method including determining an operating laser power for heating a recording layer to a recording operating temperature; determining a temperature of the recording layer when a laser beam having a predetermined reproducing laser power is radiated during a data reproduction; determining a relationship between the reproducing laser power during the data reproduction and a reproduction durability times at the reproducing laser power; and determining a relationship between the temperature of the recording layer during the data reproduction and the reproduction durability times from the relationship between the reproducing laser power during the data reproduction and the reproduction durability times.Type: ApplicationFiled: March 27, 2006Publication date: October 5, 2006Applicant: Hitachi Maxell, Ltd.Inventors: Naoki Kitagaki, Makoto Miyamoto, Makoto Iimura, Satoshi Sukada
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Patent number: 7060338Abstract: A phase-change optical recording medium capable of performing recording and reproduction at a high speed is provided, in which a reproduced signal output is not only sufficiently large but the phase-change optical recording medium also has excellent repeated rewriting performance. An interface layer 3, which is composed of a Ge—Si—N-based material, is formed on at least a surface of one side of a recording layer 4 of the phase-change optical recording medium 10. Accordingly, even when a phase-change material having a high melting point, for example, a Bi—Ge—Te-based phase-change material is used for the recording layer 4, it is possible to provide the phase-change optical recording medium in which the reproduced signal output is sufficiently large and the repeated rewriting performance is excellent.Type: GrantFiled: June 24, 2004Date of Patent: June 13, 2006Assignee: Hitachi Maxell, Ltd.Inventors: Yoshihiro Ikari, Akira Kashiwakura, Makoto Miyamoto, Makoto Iimura, Naoki Kitagaki, Yutaka Watanabe, Mayumi Kurokawa, Sonoko Onodera
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Publication number: 20050265165Abstract: An information-recording method includes the steps of moving a light beam at a selected linear velocity relative to the information-recording medium; controlling the light beam to generate a multi-pulse having at least three power levels of a first power level Ph, a second power level P1 which is lower than the first power level, and a third power level Pm which is intermediate therebetween, the multi-pulse being repeatedly modulated between the first power level Ph and the third power level Pm; adjusting the third power level Pm in response to the selected linear velocity; and recording the information by irradiating the information-recording medium with the controlled light beam. Recording compatibility can be secured for information-recording apparatuses different in recording linear velocity and laser source characteristic.Type: ApplicationFiled: July 7, 2005Publication date: December 1, 2005Applicant: HITACHI MAXELL, LTD.Inventors: Naoki Kitagaki, Makoto Miyamoto
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Publication number: 20050243668Abstract: An information-recording method and an information-recording medium which make it possible to improve overwrite characteristics in the high speed recording, especially archival overwrite characteristics for overwriting information after retaining the medium in a high temperature environment for a certain period of time, and an information-recording apparatus based on the use of the same are provided. The information-recording method comprises overwriting a random pattern with light-beams having a predetermined recording power and a variety of erasing; powers; reproducing the random pattern to determine a minimum value Pb1 and a maximum value Pb2 of the erasing power obtained when the pattern, in which a reproduction jitter exceeds a predetermined threshold value, is erased; determining an optimum erasing power Pb from the minimum value Pb1, the maximum value Pb2, and a relational expression represented by Pb=?×Pb1+(1??)×Pb2; and recording the information with the determined optimum erasing power Pb.Type: ApplicationFiled: July 8, 2005Publication date: November 3, 2005Applicant: HITACHI MAXELL, LTD.Inventors: Naoki Kitagaki, Nakoto Miyamoto, Yuji Yamazaki
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Publication number: 20040264357Abstract: A phase-change optical recording medium capable of performing recording and reproduction at a high speed is provided, in which a reproduced signal output is not only sufficiently large but the phase-change optical recording medium also has excellent repeated rewriting performance. An interface layer 3, which is composed of a Ge—Si—N-based material, is formed on at least a surface of one side of a recording layer 4 of the phase-change optical recording medium 10. Accordingly, even when a phase-change material having a high melting point, for example, a Bi—Ge—Te-based phase-change material is used for the recording layer 4, it is possible to provide the phase-change optical recording medium in which the reproduced signal output is sufficiently large and the repeated rewriting performance is excellent.Type: ApplicationFiled: June 24, 2004Publication date: December 30, 2004Applicant: Hitachi Maxell, Ltd.Inventors: Yoshihiro Ikari, Akira Kashiwakura, Makoto Miyamoto, Makoto Iimura, Naoki Kitagaki, Yutaka Watanabe, Mayumi Kurokawa, Sonoko Onodera
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Publication number: 20040252617Abstract: An information-recording method and an information-recording medium which make it possible to improve overwrite characteristics in the high speed recording, especially archival overwrite characteristics for overwriting information after retaining the medium in a high temperature environment for a certain period of time, and an information-recording apparatus based on the use of the same are provided.Type: ApplicationFiled: March 29, 2004Publication date: December 16, 2004Applicant: HITACHI MAXELL, LTD.Inventors: Naoki Kitagaki, Makoto Miyamoto, Yuji Yamazaki
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Publication number: 20040125728Abstract: An information-recording method includes the steps of moving a light beam at a selected linear velocity relative to the information-recording medium; controlling the light beam to generate a multi-pulse having at least three power levels of a first power level Ph, a second power level P1 which is lower than the first power level, and a third power level Pm which is intermediate therebetween, the multi-pulse being repeatedly modulated between the first power level Ph and the third power level Pm; adjusting the third power level Pm in response to the selected linear velocity; and recording the information by irradiating the information-recording medium with the controlled light beam. Recording compatibility can be secured for information-recording apparatuses different in recording linear velocity and laser source characteristic.Type: ApplicationFiled: December 15, 2003Publication date: July 1, 2004Applicant: HITACHI MAXELL, LTD.Inventors: Naoki Kitagaki, Makoto Miyamoto
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Patent number: 6027801Abstract: The present invention provides a magnetic recording medium with distinguished SNR and mechanical characteristics, which comprises an underlayer, a ferromagnetic thin film metallic layer and a protective film layer successively and continuously laminated on a non-magnetic resin substrate, where (A) at least one layer selected from the group consisting of an Si layer, an Si.sub.w N.sub.x C.sub.y O.sub.z layer and an Al.sub.w N.sub.x C.sub.y O.sub.z layer and (B) at least one layer selected from the group consisting of silicides, nitrides, oxides or their mixtures of Ti, Ta, Mo, V, Zr and their alloys are laminated on the non-magnetic resin substrate in the order of (A) and (B) or (i) a layer composed of at least one material selected from the group consisting of Ti, Ta, Mo, V, Zr, Nb and their alloys, (ii) at least one layer selected from the group consisting of an Si layer, an Si.sub.w N.sub.x C.sub.y O.sub.z layer and an Al.sub.w N.sub.x C.sub.y O.sub.z layer (where w+x+y+z=100 at. %, w.gtoreq.30 at. %, 0 .Type: GrantFiled: April 3, 1998Date of Patent: February 22, 2000Assignee: Hitachi Maxell, Ltd.Inventors: Tsuyoshi Maro, Kazuyoshi Adachi, Naoki Kitagaki, Osamu Ishizaki, Hideo Daimon