Patents by Inventor Masaki Aoshima
Masaki Aoshima 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: 7236440Abstract: A high-speed, write-once type optical recording medium, which utilizes laser light that is either blue or an even shorter wavelength, as well as an optical recording method and an optical recording apparatus for recording onto this optical recording medium. A high-speed, write-once type optical recording medium 10 having a recording layer 18 and a light transmission layer 22 formed sequentially on top of a support substrate 12, wherein the recording layer 18 is formed by laminating first and second vice-recording layers 18A, 18B which include Al and Sb respectively as primary components, and irradiation of a laser light of blue wavelength from a laser light source 24, through the light transmission layer 22 and onto the recording layer 18, causes diffusion and mixing of the Al and Sb contained within the first and second vice-recording layers 18A, 18B, and this mixing enables the formation of a recording mark based on an irreversible change in reflectance.Type: GrantFiled: September 11, 2002Date of Patent: June 26, 2007Assignee: TDK CorporationInventors: Tetsuro Mizushima, Jiro Yoshinari, Isamu Kuribayashi, Masaki Aoshima, Koji Mishima
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Patent number: 7231649Abstract: An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of Si, Sn and Ge as a primary component, and a second recording layer located in the vicinity of the first recording layer and containing Ag as a primary component, the optical recording medium being constituted to be irradiated by a laser beam projected onto the side opposite from the substrate. According to the thus constituted optical recording medium, it is possible to decrease a noise level and improve a C/N ratio in a reproduced signal.Type: GrantFiled: May 23, 2003Date of Patent: June 12, 2007Assignee: TDK CorporationInventors: Masaki Aoshima, Hiroyasu Inoue, Koji Mishima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7182990Abstract: An optical information recording medium which makes it possible to reduce the noise level and improve the C/N ratio. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproducing record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as a main component. The second sub-recording film is formed of a second material containing Zn as a main component and having Al added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer.Type: GrantFiled: July 22, 2004Date of Patent: February 27, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7167440Abstract: An optical information recording medium which makes it possible to reduce the noise level, improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Al as the main component and having Ti added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: GrantFiled: August 24, 2004Date of Patent: January 23, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7166347Abstract: An optical information recording medium which makes it possible to reduce the noise level, improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Al as the main component and having Cu added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: GrantFiled: August 24, 2004Date of Patent: January 23, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7160597Abstract: An optical information recording medium which makes it possible to reduce the noise level and improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as a main component. The second sub-recording film is formed of a second material containing Al as a main component and having Mg added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer.Type: GrantFiled: July 22, 2004Date of Patent: January 9, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7157128Abstract: An optical information recording medium which is capable of performing high-density recording of record data, and storing the recorded data for a long time period such that the recorded data can be normally reproduced during the long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Cu as the main component and having Si added thereto, and disposed in the vicinity of the first recording film.Type: GrantFiled: July 22, 2004Date of Patent: January 2, 2007Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7154836Abstract: An optical recording/reproducing method and an optical recording medium capable of performing excellent optical recording with a simple structure in a recording layer made of environmentally friendly materials. The optical recording medium has a recording layer on a substrate. The recording layer has a pair of dielectric layers of which states are altered by a laser beam that is an energy beam of which intensity is modulated according to information to be recorded. This recording layer also has a assisting material layer sandwiched by these dielectric layers. The assisting material layer includes an element selected from Sn, Ti, Si, Bi, Ge, and C as a principle component, while the dielectric material as a base material for the dielectric layers is any one of ZnS, SiO2, AlN, and Ta2O5.Type: GrantFiled: May 29, 2003Date of Patent: December 26, 2006Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya, Hitoshi Arai, Yoshitomo Tanaka
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Patent number: 7141288Abstract: An optical information recording medium which is capable of performing high-density recording of record data, and storing the recorded data for a long time period such that the recorded data can be normally reproduced during the long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Cu as the main component and having Mg added thereto, and disposed in the vicinity of the first recording film.Type: GrantFiled: August 24, 2004Date of Patent: November 28, 2006Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7141289Abstract: An optical information recording medium which is capable of performing high-density recording of record data, and storing the recorded data for a long time period such that the recorded data can be normally reproduced during the long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Cu as the main component and having Zn added thereto, and disposed in the vicinity of the first recording film.Type: GrantFiled: August 24, 2004Date of Patent: November 28, 2006Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Patent number: 7136343Abstract: An optical recording/reproducing method and an optical recording medium capable of performing excellent optical recording with a simple structure in a recording layer made of environmentally friendly materials. The optical recording medium has a recording layer formed on a substrate and made of a mixture of a recording assist material and a dielectric material. A laser beam of which intensity is modulated in accordance with information to be recorded is irradiated onto this recording layer to cause a state change in the recording assist material and/or the dielectric material. The information can be recorded by changing optical characteristics thereof such as reflectivity. The recording assist material includes an element selected from Sn, Ti, Si, Bi, Ge, and C as a principle component, while the dielectric material as a base material for the dielectric layers is at least one of ZnS, SiO2, AlN, and Ta2O5.Type: GrantFiled: May 29, 2003Date of Patent: November 14, 2006Assignee: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya, Hitoshi Arai, Yoshitomo Tanaka
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Publication number: 20060078825Abstract: An optical recording medium includes a substrate, two recording layers provided on the substrate and two dielectric layers each provided adjacent to one of the recording layers, the optical recording medium being constituted so that when it is irradiated with a laser beam having a wavelength ? via an objective lens having a numerical aperture NA satisfying ?/NA?640 nm from the side opposite from the substrate, a record mark whose reflection coefficient is different from those of other regions of the recording layers is formed in the recording layers and at least a part of a region(s) of the dielectric layers adjacent to the record mark is crystallized to form a crystallized region. According to the thus constituted optical recording medium, it is possible to reproduce a signal having excellent signal characteristics.Type: ApplicationFiled: November 7, 2005Publication date: April 13, 2006Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima
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Patent number: 7018694Abstract: An optical recording medium includes a recording layer containing an alloy represented by a general formula: (TixM1x)yM2y, where element M1 is Si or Al, element M2 is an element selected from the group consisting of Si, Al and Fe and different from the element M1, x is equal to or larger than 0.3 and equal to or smaller than 0.8, and y is equal to or larger than 0.75 and equal to or smaller than 1. The thus constituted optical recording medium only places minimal load on the global environment.Type: GrantFiled: March 22, 2004Date of Patent: March 28, 2006Assignees: TDK Corporation, Pioneer CorporationInventors: Yasuo Hosoda, Ayumi Mitsumori, Megumi Sato, Masataka Yamaguchi, Tetsuya Iida, Hiroyasu Inoue, Koji Mishima, Masaki Aoshima
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Patent number: 6996055Abstract: An optical recording medium includes a substrate, a first recording layer formed on the substrate and containing an element selected from the group consisting of Si, Ge, C and Al as a primary component, and a second recording layer located in the vicinity of the first recording layer and containing Zn as a primary component, the optical recording medium being constituted to be irradiated by a laser beam projected onto the side opposite from the substrate and the total thickness of the first recording layer and the second recording layer being equal to or thinner than 30 nm. According to the thus constituted optical recording medium, it is possible to decrease a noise level and improve a C/N ratio in a reproduced signal.Type: GrantFiled: April 29, 2003Date of Patent: February 7, 2006Assignee: TDK CorporationInventors: Koji Mishima, Masaki Aoshima, Hiroyasu Inoue, Hideki Hirata, Hajime Utsunomiya
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Patent number: 6929840Abstract: An optical recording medium includes a recording layer containing as a primary component an alloy containing at least two elements selected from the group consisting of Fe, Al and Si and the alloy contained in the recording layer as a primary component has a composition [x1, y1, z1] in terms of the ternary composition diagram that falls within a region of a pentagon defined by straight lines connecting points [57, 43, 0], [0, 55, 45], [15, 0, 85], [89, 11, 0] and [0, 16, 84] in the ternary composition diagram. According to the thus configured optical recording medium, only minimal load is placed on the global environment.Type: GrantFiled: March 22, 2004Date of Patent: August 16, 2005Assignees: TDK Corporation, Pioneer CorporationInventors: Yasuo Hosoda, Ayumi Mitsumori, Megumi Sato, Masataka Yamaguchi, Tetsuya Iida, Hiroyasu Inoue, Koji Mishima, Masaki Aoshima
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Publication number: 20050048249Abstract: An optical information recording medium which makes it possible to reduce the noise level, improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Al as the main component and having Cu added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: ApplicationFiled: August 24, 2004Publication date: March 3, 2005Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Publication number: 20050047305Abstract: An optical information recording medium which makes it possible to reduce the noise level, improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Al as the main component and having Ti added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: ApplicationFiled: August 24, 2004Publication date: March 3, 2005Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Publication number: 20050047303Abstract: An optical information recording medium which makes it possible to reduce the noise level and improve the C/N ratio. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Zn as the main component and having Cu added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: ApplicationFiled: August 24, 2004Publication date: March 3, 2005Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Publication number: 20050047306Abstract: An optical information recording medium which is capable of performing high-density recording of record data, and storing the recorded data for a long time period such that the recorded data can be normally reproduced during the long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Cu as the main component and having Au added thereto, and disposed in the vicinity of the first recording film.Type: ApplicationFiled: August 24, 2004Publication date: March 3, 2005Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya
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Publication number: 20050047302Abstract: An optical information recording medium which makes it possible to reduce the noise level, improve the C/N ratio and store record data for a long time period. An optical information recording medium has a recording layer formed on a substrate, for having a laser beam irradiated thereto for recording and reproduction of record data. The recording layer includes a first sub-recording film and a second sub-recording film. The first sub-recording film is formed of a first material containing Si as the main component. The second sub-recording film is formed of a second material containing Al as the main component and having Au added thereto, and disposed in the vicinity of the first recording film. The laser beam is irradiated to the recording layer via a light transmitting layer formed in a manner covering the recording layer side.Type: ApplicationFiled: August 24, 2004Publication date: March 3, 2005Applicant: TDK CorporationInventors: Hiroyasu Inoue, Koji Mishima, Masaki Aoshima, Hideki Hirata, Hajime Utsunomiya