Patents by Inventor Yumiko Anzai
Yumiko Anzai 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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Publication number: 20070009291Abstract: A process is simplified in a device in which desired materials are arranged in desired regions. After forming a film including a second material and a third material on a substrate having a first material on the surface, the second material and the third material are transferred utilizing the surface tension of the third material by using energy irradiation so that the second material comes on the first area of the surface of the substrate and the third material comes on the second area of the surface of the substrate. A fine device can be manufactured easily.Type: ApplicationFiled: July 6, 2006Publication date: January 11, 2007Inventors: Yumiko Anzai, Akemi Hirotsune
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Publication number: 20060275712Abstract: Etching properties are improved in a processing method of a phase change material in which the regions of one state are removed by etching to form a fine physical pattern. The phase change film is subjected to an advance treatment conducted before the etching, and this advance treatment uses water, an alkaline solution, an acid solution, or a surface-active agent. The regions to be removed by the etching are treated in the advance treatment to facilitate penetration of the etchant in the etching step so that complete removal is accomplished with no film residue. The advance treatment also improves etching resistance of the regions to be left unremoved. The process is thereby stabilized.Type: ApplicationFiled: August 24, 2005Publication date: December 7, 2006Inventors: Yumiko Anzai, Toshimichi Shintani
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Patent number: 7042823Abstract: Recording information is disclosed in which an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record-ready power level lower than the record power level. The information is recorded on the recording medium in the form of length and interval of a mark portion. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion.Type: GrantFiled: June 30, 2005Date of Patent: May 9, 2006Assignee: Hitachi, Ltd.Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Patent number: 7041430Abstract: Problem to be solved is that when an information recording medium is repeatedly subjected to recording of information several hundreds times, the atoms in a protective layer are diffused and dissolved into a recording layer to lower a reflectivity greatly and make the medium unendurable to many times of overwriting. This problem can be solved by a medium constituted of interference layer 10, interface layer 12, phase-change type recording layer 14, protective layer 13 having a tin content of from 23.3 atomic % to 32.3 atomic %, and a heat sink layer 8 successively formed on substrate 1, as seen from a light-incidence side. By use of this medium, the dissolution of atoms can be prevented, and overwriting for many times can be achieved.Type: GrantFiled: August 16, 2002Date of Patent: May 9, 2006Assignee: Hitachi, Ltd.Inventors: Makoto Miyamoto, Akemi Hirotsune, Toshimichi Shintani, Takahiro Kurokawa, Keikichi Andoo, Yumiko Anzai
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Publication number: 20060072434Abstract: Super-resolution technology was proposed for generating marks smaller than the optical resolution in order to record data at high density on the optical disk. However, the achievable high density of the super-resolution technology was limited due to fluctuation of the region exhibiting the super-resolution effect due to the grain size or the molecular size comprising the super-resolution film. However fluctuation in the region exhibiting the super-resolution effect is reduced by utilizing recording marks possessing their own super-resolution effect and also by separating the recording marks from each other.Type: ApplicationFiled: February 7, 2005Publication date: April 6, 2006Inventors: Toshimichi Shintani, Harukazu Miyamoto, Yumiko Anzai, Hiromi Kudo
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Patent number: 7012871Abstract: A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length.Type: GrantFiled: November 3, 2004Date of Patent: March 14, 2006Assignee: Hitachi, Ltd.Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Publication number: 20060040088Abstract: Disclosed are an information reproduction method and an information recording medium that allow reproducing information below a diffraction limit. A recording layer formed with recording marks consisting of a nucleation inducer and a reading layer are provided. When a reading beam is irradiated, a predetermined area of the reading layer is crystallized based on the recording mark of the recording layer such that the area is magnified to a size larger than the recording mark, and information is thus reproduced. Information of the recording marks below the diffraction limit can be reproduced without using a special information reproduction apparatus.Type: ApplicationFiled: September 1, 2004Publication date: February 23, 2006Inventors: Akemi Hirotsune, Hiroyuki Minemura, Yumiko Anzai, Toshimichi Shintani
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Publication number: 20050276211Abstract: An information recording medium and manufacturing method for high-speed and high density recording. An inorganic film is formed by sputtering while applying a bias voltage to shift the substrate voltage potential in the negative direction, or a laminated film is formed by applying energy after coating a substrate with an organic film, and the irregularities maintained even after the laminated film is formed, so that stable, high-capacity and high-speed recording can be attained by forming a multi-information-layer that still retains the irregularities.Type: ApplicationFiled: June 8, 2005Publication date: December 15, 2005Inventors: Akemi Hirotsune, Motoyasu Terao, Yumiko Anzai, Masaki Mukoh, Harukazu Miyamoto, Takeshi Maeda, Kyoko Kojima, Tateo Irie, Toshimasa Kamisada, Reiji Tamura, Hideki Nagano, Hiroyuki Awano
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Publication number: 20050259555Abstract: Recording information is disclosed in which an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record-ready power level lower than the record power level. The information is recorded on the recording medium in the form of length and interval of a mark portion. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion.Type: ApplicationFiled: June 30, 2005Publication date: November 24, 2005Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Publication number: 20050237890Abstract: Recording information is disclosed in which an information recording medium is irradiated with a recording energy beam that is power-modulated into at least a record power level and a record-ready power level lower than the record power level. The information is recorded on the recording medium in the form of length and interval of a mark portion. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion.Type: ApplicationFiled: June 30, 2005Publication date: October 27, 2005Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Patent number: 6954941Abstract: This invention relates to an information-recording medium that is used for recording information through radiation of energy beam. The information recording medium has a groove-shaped information recording track and is provided with a recording layer, one or more kinds of heat sink control layers and heat sink layers. A sum of film thickness of the more than one kind of recording layer is equal to or less than a step between information recording tracks, and a sum of film thickness of one or more kinds of heat sink control layers is more than a groove depth of the information recording track. With this configuration, no cross-erase is produced even if the information-recording medium is applied for a high density recording with the track pitch being 70% or less.Type: GrantFiled: September 3, 2003Date of Patent: October 11, 2005Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.Inventors: Makoto Miyamoto, Junko Ushiyama, Keikichi Ando, Yumiko Anzai, Akemi Hirotsune, Motoyasu Terao, Tetsuya Nishida, Yasushi Miyauchi, Mitsuhide Miyamoto
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Publication number: 20050106508Abstract: In fabricating process using a light beam or electron beam, reactivity is determined by the total amounts of photons or electrons absorbed by resist and consequently, fine fabrication cannot be achieved. On the other hand, thermal recording has been proposed but in the thermal recording, miniaturization of the fabrication size depends on a spot size of light beam or electron beam used for recording and is limited. Under the circumstance, to ensure a fine uneven pattern to be produced with high reproducibility, only crystal of a recording film used in a phase-change optical disk is peeled off by using an alkaline solution or pure water to leave only an amorphous portion on the sample surface and as a result, crystalline and amorphous patterns are converted into an uneven pattern.Type: ApplicationFiled: September 3, 2004Publication date: May 19, 2005Inventors: Toshimichi Shintani, Yumiko Anzai, Hiroyuki Minemura, Harukazu Miyamoto
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Publication number: 20050088943Abstract: A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length.Type: ApplicationFiled: November 3, 2004Publication date: April 28, 2005Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Publication number: 20050064334Abstract: An information recording medium for high-density recording and reproduction that is low-cost and that has good rewrite characteristics. The information recording medium, in which recording is performed as an atomic arrangement is changed by optical irradiation, is capable of a number of rewrites. The information recording medium comprises a substrate on which a first protective layer with a thickness in the range from 18 to 65 nm, a recording film, a second protective layer, and a reflective layer are disposed in the mentioned order as seen from a light-incident side. Not less than 97 atomic % of the composition of the recording film is accounted for by Ge, Bi, and Te.Type: ApplicationFiled: August 31, 2004Publication date: March 24, 2005Applicant: HITACHI MAXELL, LTD.Inventors: Akemi Hirotsune, Junko Ushiyama, Yumiko Anzai
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Patent number: 6854126Abstract: In an information recording medium, a first protective layer, a recording film, a second protective layer and a reflective layer are provided on a substrate sequentially from a side where light is irradiated, the first protective layer having a film thickness of 2 nm to 25 nm. 95 atomic % or more of a material of the first protective layer is SiO2—In2O3—SnO2—ZnS, and a ZnS amount in the first protective layer is in the range of 4 mol % to 33 mol %.Type: GrantFiled: January 16, 2003Date of Patent: February 8, 2005Assignee: Hitachi, Ltd.Inventors: Akemi Hirotsune, Motoyasu Terao, Yumiko Anzai
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Patent number: 6842415Abstract: A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length.Type: GrantFiled: June 23, 2003Date of Patent: January 11, 2005Assignee: Hitachi, Ltd.Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga
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Patent number: 6806030Abstract: In an optical disk for high density recording, for preventing the deformation of recording tracks caused by stress which may develop between the substrate and the recording stacked film formed thereon, a stress-compensation layer having a metal element such as Ti or Cr as a main component is provided. The stress-compensation layer undergoes contraction (tensile stress) to compensate for compression stress which develops in the stacked film during cooling after the thermal expansion of the substrate surface that occurs at the end of film formation. The stress-compensation layer has a pillar-like structure which, starting from the lower face, reaches the upper face of the film.Type: GrantFiled: March 19, 2001Date of Patent: October 19, 2004Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.Inventors: Motoyasu Terao, Makoto Miyamoto, Yasushi Miyauchi, Keikichi Ando, Yumiko Anzai, Junko Ushiyama, Reiji Tamura, Yoshihiro Ikari, Tamotsu Fuchioka
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Publication number: 20040106065Abstract: An phase-change optical disk comprises a substrate, a first protective layer, a first thermostable layer, a recording layer, a second thermostable layer, a second protective layer, an absorptance control layer, and a heat-diffusing layer which are provided in this order from a side on which a laser beam comes thereinto, wherein a recording layer material has composition ratios which are within a range surrounded by composition points of B3 (Bi3, Ge46, Te51), C3 (Bi4, Ge46, Te50), D3 (Bi5, Ge46, Te49), D5 (Bi10, Ge42, Te48), C5 (Bi10, Ge41, Te49), and B5 (Bi7, Ge41, Te52) on a triangular composition diagram. Recrystallization is not caused even when information is recorded on an inner circumferential portion, a reproduced signal is scarcely deteriorated even when rewriting is performed multiple times, and any erasing residue of amorphous matters scarcely appears at an outer circumferential portion.Type: ApplicationFiled: September 8, 2003Publication date: June 3, 2004Applicant: HITACHI MAXELL, LTD.Inventors: Makoto Miyamoto, Reiji Tamura, Akira Kashiwakura, Hiroshi Shirai, Yoshihiro Ikari, Makoto Iimura, Yumiko Anzai, Kazuyo Umezawa
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Patent number: 6740382Abstract: An information recording medium having a substrate, a recording layer on which information is recorded in accordance with a change of atomic arrangement caused by irradiation of light, a first reflective layer, and a second reflective layer. The second reflective layer is formed on the first reflective layer. The first reflective layer includes an Al alloy as a main component and the second reflective layer includes an Ag alloy as a main component.Type: GrantFiled: July 23, 2002Date of Patent: May 25, 2004Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.Inventors: Makoto Miyamoto, Akemi Hirotsune, Keikichi Andoo, Tetsuya Nishida, Motoyasu Terao, Junko Ushiyama, Yumiko Anzai
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Publication number: 20040081052Abstract: A method for recording information is disclosed in which an information recording medium is irradiated with a recording energy beam power-modulated into at least a record power level and a record-ready power level lower than the record power level. When forming a mark portion of a predetermined length, the radiation energy of the energy beam is increased as compared with when forming a mark portion of a different length before or after the first pulse of an energy beam pulse train including at least a pulse for forming the mark portion. Also, only in the case where the energy beam is modulated by the power lower in power level than the record-ready power level after the last pulse of the energy beam pulse train including at least one pulse for forming a mark portion and the mark portion is followed by a space portion of a predetermined length, the particular radiation energy of low power level is reduced as compared with when the mark portion is followed by a space potion of a different length.Type: ApplicationFiled: June 23, 2003Publication date: April 29, 2004Applicant: Hitachi, Ltd.Inventors: Makoto Miyamoto, Tsuyoshi Toda, Masatoshi Ohtake, Motoyasu Terao, Junko Ushiyama, Keikichi Andoo, Yumiko Anzai, Akemi Hirotsune, Tetsuya Nishida, Hideki Saga