Patents by Inventor Sumio Hosaka
Sumio Hosaka 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: 8120007Abstract: A phase-change channel transistor includes a first electrode; a second electrode; a memory layer provided between the first and second electrodes; and a third electrode provided for the memory layer with an insulating film interposed therebetween, wherein the memory layer includes at least a first layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature and a second layer formed from a resistive material, and wherein the resistance value of the second layer is smaller than the resistance value of the first layer in the amorphous phase, but is larger than the resistance value of the first layer in the crystalline phase.Type: GrantFiled: February 3, 2011Date of Patent: February 21, 2012Assignee: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Publication number: 20110127486Abstract: A phase-change channel transistor includes a first electrode; a second electrode; a memory layer provided between the first and second electrodes; and a third electrode provided for the memory layer with an insulating film interposed therebetween, wherein the memory layer includes at least a first layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature and a second layer formed from a resistive material, and wherein the resistance value of the second layer is smaller than the resistance value of the first layer in the amorphous phase, but is larger than the resistance value of the first layer in the crystalline phase.Type: ApplicationFiled: February 3, 2011Publication date: June 2, 2011Applicant: SEMICONDUCTOR TECHNOLOGY ACADEMIC RESEARCH CENTERInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Patent number: 7932508Abstract: A multi-value recording phase-change memory device that can stably record multi-value information, and that can reproduce information with high reliability, comprises a first electrode layer 26, a second electrode layer 28, and a memory layer 30 provided between the first and second electrode layers 26 and 28 and containing a phase-change material layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature, wherein the memory layer 30 includes a plurality of mutually isolated sub-memory layers 32, 34, 36, and 38 between the first and second electrode layers 26 and 28.Type: GrantFiled: July 19, 2010Date of Patent: April 26, 2011Assignee: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Patent number: 7897958Abstract: To reduce the voltage required to cause a phase transition from an amorphous phase to a crystalline phase, a phase-change memory device (1) comprises: a first electrode (6); a second electrode (8); and a memory layer (14) provided between the first (6) and second (8) electrodes, wherein the memory layer (14) includes at least a first layer (10) formed from a phase-change material which is stable in either the amorphous phase or the crystalline phase at room temperature, and a second layer (12) formed from a resistive material, and wherein the resistance value of the second layer (12) is smaller than the resistance value of the first layer (10) in the amorphous phase, but is larger than the resistance value of the first layer (10) in the crystalline phase.Type: GrantFiled: August 2, 2007Date of Patent: March 1, 2011Assignee: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Publication number: 20100283027Abstract: A multi-value recording phase-change memory device that can stably record multi-value information, and that can reproduce information with high reliability, comprises a first electrode layer 26, a second electrode layer 28, and a memory layer 30 provided between the first and second electrode layers 26 and 28 and containing a phase-change material layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature, wherein the memory layer 30 includes a plurality of mutually isolated sub-memory layers 32, 34, 36, and 38 between the first and second electrode layers 26 and 28.Type: ApplicationFiled: July 19, 2010Publication date: November 11, 2010Applicant: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Patent number: 7781753Abstract: A multi-value recording phase-change memory device that can stably record multi-value information, and that can reproduce information with high reliability, comprises a first electrode layer 26, a second electrode layer 28, and a memory layer 30 provided between the first and second electrode layers 26 and 28 and containing a phase-change material layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature, wherein the memory layer 30 includes a plurality of mutually isolated sub-memory layers 32, 34, 36, and 38 between the first and second electrode layers 26 and 28.Type: GrantFiled: October 3, 2007Date of Patent: August 24, 2010Assignee: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Publication number: 20100199746Abstract: A cantilever type sensor includes a cantilever, an actuator that oscillates the cantilever, and a sensor provided at the cantilever so as to detect an oscillation condition of the cantilever. Further, the cantilever type sensor includes a control unit that controls the actuator so as to cause the cantilever to be subjected to pulse excitation, and a measurement unit that measures a physical quantity related to a measurement object, based on a change in pulse response detected in the sensor.Type: ApplicationFiled: March 30, 2006Publication date: August 12, 2010Applicants: NATIONAL UNIVERSITY CORPORATION GUNMA UNIVERSITY, TOKYO SOKKI KENKYUJO CO., LTD.Inventors: Sumio Hosaka, Hayato Sone, Haruki Okano, Masami Iwasaki
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Publication number: 20100095774Abstract: Minute masses of a plurality of measuring objects are measured at a time. A multi-lever is prepared, in which a plurality of cantilevers, each having a buried piezoresistance element, is provided. Different measuring object attracting substances are coated on the multi-lever. The multi-lever is driven by a single vibration exciting device. The vibrational frequency is swept within a predetermined range, and the resonance frequency of each cantilever is detected. Frequency changes before putting in and after putting in the measuring object are detected, and based on this, the mass changes are calculated.Type: ApplicationFiled: December 5, 2007Publication date: April 22, 2010Applicants: National University Corporation Gunma University, Kabushikikaisha Tokyo Sokki KenkyujoInventors: Hayato Sone, Sumio Hosaka, Haruki Okano, Mitsumasa Suzuki
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Publication number: 20080105861Abstract: A multi-value recording phase-change memory device that can stably record multi-value information, and that can reproduce information with high reliability, comprises a first electrode layer 26, a second electrode layer 28, and a memory layer 30 provided between the first and second electrode layers 26 and 28 and containing a phase-change material layer formed from a phase-change material which is stable in either an amorphous phase or a crystalline phase at room temperature, wherein the memory layer 30 includes a plurality of mutually isolated sub-memory layers 32, 34, 36, and 38 between the first and second electrode layers 26 and 28.Type: ApplicationFiled: October 3, 2007Publication date: May 8, 2008Applicant: SEMICONDUCTOR TECHNOLOGY ACADEMIC RESEARCH CENTERInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Publication number: 20080049490Abstract: To reduce the voltage required to cause a phase transition from an amorphous phase to a crystalline phase, a phase-change memory device (1) comprises: a first electrode (6); a second electrode (8); and a memory layer (14) provided between the first (6) and second (8) electrodes, wherein the memory layer (14) includes at least a first layer (10) formed from a phase-change material which is stable in either the amorphous phase or the crystalline phase at room temperature, and a second layer (12) formed from a resistive material, and wherein the resistance value of the second layer (12) is smaller than the resistance value of the first layer (10) in the amorphous phase, but is larger than the resistance value of the first layer (10) in the crystalline phase.Type: ApplicationFiled: August 2, 2007Publication date: February 28, 2008Applicant: Semiconductor Technology Academic Research CenterInventors: Sumio Hosaka, Hayato Sone, Masaki Yoshimaru, Takashi Ono, Mayumi Nakasato
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Patent number: 7241994Abstract: A digital probing type atomic force microscope (AFM) for measuring high aspect structures with high precision. A probe 21 is vibrated while moved to the vicinity of an atomic force region on a specimen surface. The position of the probe is measured when a specified atomic force is detected in the atomic force region. The probe is then moved away from the specimen surface. A servo system for maintaining a gap between the probe and specimen surface is stopped. The probe is moved to a measurement point along the specimen surface while kept away from the specimen. The vibration frequency is a frequency slightly offset from the cantilever resonance point. The atomic force is detected based on the vibration amplitude of the cantilever.Type: GrantFiled: February 5, 2003Date of Patent: July 10, 2007Assignee: RikenInventors: Tsuyoshi Hasegawa, Masakazu Aono, Tomonobu Nakayama, Sumio Hosaka
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Publication number: 20050242283Abstract: A digital probing type atomic force microscope (AFM) for measuring high aspect structures with high precision. A probe 21 is vibrated while moved to the vicinity of an atomic force region on a specimen surface. The position of the probe is measured when a specified atomic force is detected in the atomic force region. The probe is then moved away from the specimen surface. A servo system for maintaining a gap between the probe and specimen surface is stopped. The probe is moved to a measurement point along the specimen surface while kept away from the specimen. The vibration frequency is a frequency slightly offset from the cantilever resonance point. The atomic force is detected based on the vibration amplitude of the cantilever.Type: ApplicationFiled: February 5, 2003Publication date: November 3, 2005Inventors: Tsuyoshi Hasegawa, Masakazu Aono, Tomonobu Nakayama, Sumio Hosaka
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Patent number: 6944117Abstract: An information recording medium capable of high-density recording and accurate reproduction and also capable of repeated recording and reproduction, an information recording device that employs the information recording medium has a Co—Si oxide thin film 1 constructed such that columnar crystals 2 are separated by an intergranular phase 3 which contains SiO2 having a lower coefficient of thermal conductivity than the columnar crystals 2. Therefore, the intergranular phase 3 prevents heat transfer from one columnar crystal 2 to another. In addition, the intergranular phase 3 separates columnar crystals 2 from each other, so that the crystalline structure of each columnar crystal 2 is not affected by its adjacent columnar crystal 2.Type: GrantFiled: November 5, 2003Date of Patent: September 13, 2005Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Ken Takahashi, Sumio Hosaka, Motoyasu Terao, Fumiyoshi Kirino, Eiji Koyama, Hiroki Kuramoto
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Patent number: 6844092Abstract: The object of the present invention is to provide an optically functional element having a large change in refractive index with temperature change and a fast change rate in refractive index, a production method for the same and optical switch, temperature sensor and optical information recording medium using the same. The present invention provides a thin film formed directly on a substrate or via other layers, and the film is composed of particles with an average diameter of not larger than 13 nm, observed at film surface. The present invention also provides an optically functional element having an amount of change in refractive index of not less than 2.0×10?4/° C. The present invention further provides a production method for said thin film by sputtering under reduced pressure in an inert gas atmosphere containing 3-15% by volume of oxygen, and optical switch, temperature sensor and optical information recording medium using said element.Type: GrantFiled: February 20, 2003Date of Patent: January 18, 2005Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Ken Takahashi, Motoyasu Terao, Toshimichi Shintani, Fumiyoshi Kirino, Eiji Koyama, Sumio Hosaka, Sachiko Okuzaki, Takashi Namekawa, Tetsuo Nakazawa
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Patent number: 6839142Abstract: An absolute accuracy in the range from ±2 nm to ±1 nm for a displacement measurement value is provided by a laser interferometer displacement measuring system. A fluctuating error component that appears corresponding to the wave cycle of laser light is detected and subtracted from the measurement value while a stage is moving, thereby providing a high accuracy.Type: GrantFiled: September 25, 2003Date of Patent: January 4, 2005Assignee: Hitachi, Ltd.Inventors: Fumio Isshiki, Masakazu Sugaya, Tatsundo Suzuki, Masahiro Yamaoka, Sumio Hosaka
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Patent number: 6790502Abstract: The object of the present invention is to provide an optically functional element having a large change in refractive index with temperature change and a fast change rate in refractive index, a production method for the same and optical switch, temperature sensor and optical information recording medium using the same. The present invention provides a thin film formed directly on a substrate or via other layers, and the film is composed of particles with an average diameter of not larger than 13 nm, observed at film surface. The present invention also provides an optically functional element having an amount of change in refractive index of not less than 2.0×10−4/° C. The present invention further provides a production method for said thin film by sputtering under reduced pressure in an inert gas atmosphere containing 3-15% by volume of oxygen, and optical switch, temperature sensor and optical information recording medium using said element.Type: GrantFiled: August 22, 2002Date of Patent: September 14, 2004Assignee: Hitachi, Ltd.Inventors: Hiroki Yamamoto, Takashi Naito, Ken Takahashi, Motoyasu Terao, Toshimichi Shintani, Fumiyoshi Kirino, Eiji Koyama, Sumio Hosaka, Sachiko Okuzaki, Takashi Namekawa, Tetsuo Nakazawa
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Patent number: 6768556Abstract: A near-field probe includes a metallic scatterer fabricated on a substrate in a contour of a circular cone, a polygonal pyramid, a planar ellipse, or a triangle and a film of a metal, a dielectric, or a semiconductor formed in a periphery of the scatterer with film thickness equal to height of the scatterer.Type: GrantFiled: September 20, 2000Date of Patent: July 27, 2004Assignee: Hitachi, Ltd.Inventors: Takuya Matsumoto, Takeshi Shimano, Sumio Hosaka, Fumio Isshiki
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Patent number: 6749955Abstract: An ultra-high density information recording media has an inorganic compound layer 12 on a substrate 11, and in the inorganic compound layer 12, an oxide of at least one kind selected from silicon oxide, aluminum oxide, titanium oxide, tantalum oxide, and zinc oxide exists in an amorphous state at a grain boundary of crystal grain of an oxide of at least one kind selected from cobalt oxide, iron oxide, and nickel oxide. The media has a magnetic layer 13 made of an artificial lattice multilayer obtained by alternately laminating a Co layer or an alloy layer consisting of Co as a main phase and a metal element layer of at least one kind selected from Pt and Pd onto the layer 12. Thus, a distribution of magnetic properties serving as a pinning site of the movement of a magnetic wall in case of recording information to the magnetic layer 13 is formed in the magnetic layer 13.Type: GrantFiled: January 23, 2003Date of Patent: June 15, 2004Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.Inventors: Fumiyoshi Kirino, Nobuyuki Inaba, Hiroki Yamamoto, Takashi Naitou, Ken Takahashi, Eiji Koyama, Motoyasu Terao, Sumio Hosaka, Hiroki Kuramoto
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Patent number: 6746749Abstract: The magnetic recording medium includes an underlayer 12 formed of an inorganic compound layer, and a magnetic layer 13 formed over the underlayer 12. The inorganic compound layer as the underlayer 12 has crystal grains and at least one kind of oxide, the crystal grains having as main elements at least one of cobalt oxide, chromium oxide, iron oxide and nickel, the at least one kind of oxide lying as a non-crystalline phase in grain boundaries between the crystal grains and selected from among silicon oxide, aluminum oxide, titanium oxide, tantalum oxide and zinc oxide.Type: GrantFiled: August 29, 2002Date of Patent: June 8, 2004Assignees: Hitachi, Ltd., Hitachi Maxell, Ltd.Inventors: Fumiyoshi Kirino, Nobuyuki Inaba, Hiroki Yamamoto, Ken Takahashi, Takashi Naitou, Motoyasu Terao, Sumio Hosaka, Eiji Koyama, Hiroki Kuramoto
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Publication number: 20040091815Abstract: An information recording medium capable of high-density recording and accurate reproduction and also capable of repeated recording and reproduction, an information recording device that employs the information recording medium has a Co—Si oxide thin film 1 constructed such that columnar crystals 2 are separated by an intergranular phase 3 which contains SiO2 having a lower coefficient of thermal conductivity than the columnar crystals 2. Therefore, the intergranular phase 3 prevents heat transfer from one columnar crystal 2 to another. In addition, the intergranular phase 3 separates columnar crystals 2 from each other, so that the crystalline structure of each columnar crystal 2 is not affected by its adjacent columnar crystal 2.Type: ApplicationFiled: November 5, 2003Publication date: May 13, 2004Inventors: Hiroki Yamamoto, Takashi Naito, Ken Takahashi, Sumio Hosaka, Motoyasu Terao, Fumiyoshi Kirino, Eiji Koyama, Hiroki Kuramoto