Patents by Inventor Yoshio Ozawa

Yoshio Ozawa 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).

  • Publication number: 20110143530
    Abstract: A semiconductor memory device according to the present invention includes: a first transistor formed on a semiconductor substrate 11, the first transistor including a first gate-insulating film 14a that is oxynitrided; and a second transistor including a second gate-insulating film 14b formed on the semiconductor substrate 11 and a barrier film 20 formed at least partially on the second gate-insulating film 14b, the second gate-insulating film having a lower nitrogen atom concentration than the first gate-insulating film.
    Type: Application
    Filed: February 23, 2011
    Publication date: June 16, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Atsuhiro SATO, Fumitaka Arai, Yoshio Ozawa, Takeshi Kamigaichi
  • Patent number: 7960230
    Abstract: According to an aspect of the invention, there is provided a semiconductor device including a plurality of memory cells, comprising a plurality of floating gate electrodes which are formed on a tunnel insulating film formed on a semiconductor substrate and have an upper portion which is narrower in a channel width direction than a lower portion, an interelectrode insulating film formed on the floating gate electrodes, and a control gate electrode which is formed on the interelectrode insulating film formed on the floating gate electrodes and partially buried between the floating gate electrodes opposing each other.
    Type: Grant
    Filed: March 4, 2010
    Date of Patent: June 14, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshio Ozawa
  • Patent number: 7947610
    Abstract: Claimed and disclosed is a semiconductor device including a transistor having a gate insulating film structure containing nitrogen or fluorine in a compound, such as metal silicate, containing metal, silicon and oxygen, a gate insulating film structure having a laminated structure of an amorphous metal oxide film and metal silicate film, or a gate insulating film structure having a first gate insulating film including an oxide film of a first metal element and a second gate insulating film including a metal silicate film of a second metal element.
    Type: Grant
    Filed: May 26, 2009
    Date of Patent: May 24, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshitaka Tsunashima, Seiji Inumiya, Yasumasa Suizu, Yoshio Ozawa, Kiyotaka Miyano, Masayuki Tanaka
  • Publication number: 20110108905
    Abstract: A nonvolatile semiconductor memory includes first and second memory cells having a floating gate and a control gate. The floating gate of the first and second memory cells is comprised a first part, and a second part arranged on the first part, and a width of the second part in an extending direction of the control gate is narrower than that of the first part. A first space between the first parts of the first and second memory cells is filled with one kind of an insulator. The control gate is arranged at a second space between the second parts of the first and second memory cells.
    Type: Application
    Filed: January 14, 2011
    Publication date: May 12, 2011
    Inventors: Masayuki ICHIGE, Fumitaka Arai, Riichiro Shirota, Toshitake Yaegashi, Yoshio Ozawa, Akihito Yamamoto, Ichiro Mizushima, Yoshihiko Saito
  • Patent number: 7937959
    Abstract: An object of the present invention is to provide a control system, an integrated control apparatus, and a control program that are capable of well maintaining freshness and quality of food articles, by reducing time for performing a recovery operation following a frost removing operation of cooling devices. In response to a start of the frost removing operation of a first showcase, an integrated control apparatus provides a second device controller (device control unit) with a “lower limit cooling instruction (increase instruction)” to increase the refrigerant supplied to a second showcase to an amount larger than that before the frost removing operation starts. In response to the “lower limit cooling instruction (increase instruction),” the second device controller (device control unit) increases the amount of the refrigerant supplied to the second showcase.
    Type: Grant
    Filed: June 16, 2009
    Date of Patent: May 10, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Yoshinori Tanabe, Atsushi Ouchi, Yoshio Ozawa
  • Patent number: 7928500
    Abstract: A semiconductor device includes a tunnel insulating film formed on a semiconductor substrate, a floating gate electrode formed on the tunnel insulating film, an inter-electrode insulating film formed on the floating gate electrode, and a control gate electrode formed on the inter-electrode insulating film, wherein the inter-electrode insulating film includes a main insulating film and a plurality of nano-particles in the main insulating film.
    Type: Grant
    Filed: November 21, 2008
    Date of Patent: April 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuyuki Sekine, Yoshio Ozawa, Hiroaki Tsunoda
  • Patent number: 7927953
    Abstract: On a silicon substrate is formed a stacked body by alternately stacking a plurality of silicon oxide films and silicon films, a trench is formed in the stacked body, an alumina film, a silicon nitride film and a silicon oxide film are formed in this order on an inner surface of the trench, and a channel silicon crystalline film is formed on the silicon oxide film. Next, a silicon oxide layer is formed at an interface between the silicon oxide film and the channel silicon crystalline film by performing thermal treatment in an oxygen gas atmosphere.
    Type: Grant
    Filed: October 8, 2009
    Date of Patent: April 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yoshio Ozawa
  • Patent number: 7927949
    Abstract: A semiconductor memory device manufacturing method includes forming a floating gate electrode above a semiconductor substrate, forming an interelectrode insulating film above the floating gate electrode, forming a first radical nitride film on a surface of the interelectrode insulating film by first radical nitriding, and forming a control gate electrode on the first radical nitride film.
    Type: Grant
    Filed: April 7, 2010
    Date of Patent: April 19, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshio Ozawa, Isao Kamioka, Junichi Shiozawa, Akihito Yamamoto, Ryota Fujitsuka, Yoshihiro Ogawa, Katsuaki Natori, Katsuyuki Sekine, Masayuki Tanaka, Daisuke Nishida
  • Publication number: 20110073935
    Abstract: In one embodiment, a non-volatile semiconductor memory device has a semiconductor layer having a pair of source/drain regions formed at a predetermined distance and a channel region between the pair of source/drain regions; a first insulating film formed above the semiconductor layer; a charge accumulating film formed above the first insulating film; a second insulating film formed above the charge accumulating film; and a control gate electrode film formed above the second insulating film. The first insulating film includes a first oxide film, a first silicon nitride film formed above the first oxide film and including Boron, and a second oxide film formed above the first silicon nitride film.
    Type: Application
    Filed: September 21, 2010
    Publication date: March 31, 2011
    Inventors: Akiko SEKIHARA, Tesuya Kai, Masaaki Higuchi, Yoshio Ozawa
  • Publication number: 20110068312
    Abstract: According to one embodiment, a nonvolatile memory device comprises a plurality of first lines, a plurality of second lines, and memory cells. Each of the memory cells comprise a variable resistor, and a diode. The variable resistor includes a first metal oxide film and is configured to reversibly change resistance value by energy application. The diode includes a second metal oxide film and is connected in series to the variable resistor. The first metal oxide film has at least one of dielectric constant lower than that of the second metal oxide film and physical film thickness greater than that of the second metal oxide film.
    Type: Application
    Filed: June 7, 2010
    Publication date: March 24, 2011
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuyuki SEKINE, Yoshio Ozawa
  • Publication number: 20110069530
    Abstract: According to one embodiment, there is provided a method of manufacturing a nonvolatile memory device. In this method, a first voltage may be applied to a variable resistive element having a resistance value which is electrically rewritable in a high resistance and in a low resistance. In this method, a second voltage may be applied to the variable resistive element in a case where the resistance value of the variable resistive element to which the first voltage has been applied is greater than a resistance value of the low resistance and is not greater than a resistance value of the high resistance. Further, in this method, the applying of the second voltage to the variable resistive element may be repeated until the resistance value of the variable resistive element to which the second voltage has been applied falls within a range of the resistance value of the low resistance.
    Type: Application
    Filed: June 25, 2010
    Publication date: March 24, 2011
    Inventors: Katsuyuki SEKINE, Ryota Fujitsuka, Yoshio Ozawa
  • Publication number: 20110068316
    Abstract: According to one embodiment, a nonvolatile memory device includes a plurality of nonvolatile memory elements each of that includes a resistance change film. The resistance change film is capable of recording information by transitioning between a plurality of states having different resistances in response to at least one of a voltage applied to the resistance change film or a current passed through the resistance change film, and the resistance change film includes an oxide containing at least one element selected from the group consisting of Hf, Zr, Ni, Ta, W, Co, Al, Fe, Mn, Cr, and Nb. An impurity element contained in the resistance change film is at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Sc, Y, La, V, Ta, B, Ga, In, Tl, C, Si, Ge, Sn, Pb, N, P, As, Sb, Bi, S, Se, and Te, and the impurity element has an absolute value of standard Gibbs energy of oxide formation larger than an absolute value of standard Gibbs energy of oxide formation of the element contained in the oxide.
    Type: Application
    Filed: September 16, 2010
    Publication date: March 24, 2011
    Inventors: Kensuke TAKANO, Katsuyuki Sekine, Yoshio Ozawa, Ryota Fujitsuka, Mitsuru Sato
  • Publication number: 20110065262
    Abstract: A method of manufacturing a semiconductor device according to an embodiment of the present invention includes forming, on a surface of a semiconductor substrate, an isolation trench including sidewall parts and a bottom part, or a stepped structure including a first planar part, a second planar part, and a step part located at a boundary between the first planar part and the second planar part, and supplying oxidizing ions or nitriding ions contained in plasma generated by a microwave, a radio-frequency wave, or electron cyclotron resonance to the sidewall parts and the bottom part of the isolation trench or the first and second planar parts and the step part of the stepped structure by applying a predetermined voltage to the semiconductor substrate, to perform anisotropic oxidation or anisotropic nitridation of the sidewall parts and the bottom part of the isolation trench or the first and second planar parts and the step part of the stepped structure.
    Type: Application
    Filed: November 12, 2010
    Publication date: March 17, 2011
    Inventors: Isao Kamioka, Junichi Shiozawa, Ryu Kato, Yoshio Ozawa
  • Publication number: 20110053339
    Abstract: In one embodiment, a method for manufacturing a semiconductor device includes forming a first conductor layer on a surface of a semiconductor layer via a tunnel insulating film. The method includes forming an isolation trench extending from a surface of the first conductor layer to the semiconductor layer to form a plurality of conductive plates on the tunnel insulating film. The method includes filling the isolation trench with an element insulation insulating film from bottom of the isolation trench to an intermediate portion of a side surface of each of the conductive plates. The method includes forming a silicon nitride film on an exposed surface of the each of the conductive plates not covered with the element insulation insulating film. In addition, the method includes filling an upper portion of the isolation trench by forming a second conductor layer above the conductive plates and the element insulation insulating film.
    Type: Application
    Filed: August 5, 2010
    Publication date: March 3, 2011
    Inventor: Yoshio OZAWA
  • Publication number: 20110049612
    Abstract: According to one embodiment, a nonvolatile semiconductor memory device including a semiconductor layer with a main surface, a first insulating layer formed on the main surface of the semiconductor layer, a charge storage layer formed on the first insulating layer, a second insulating layer formed on the charge storage layer, and a control gate electrode formed on the second insulating layer. At least one inelastic scattering film that reduces energy of electrons by scattering is contained in at least one of the charge storage layer and second insulating layer.
    Type: Application
    Filed: August 12, 2010
    Publication date: March 3, 2011
    Inventors: Masaaki HIGUCHI, Yoshio Ozawa, Katsuyuki Sekine, Ryota Fujitsuka
  • Patent number: 7897455
    Abstract: A semiconductor device manufacturing method includes forming a first insulating film on a semiconductor substrate containing silicon, the first insulating film having a first dielectric constant and constituting a part of a tunnel insulating film, forming a floating gate electrode film on the first insulating film, the floating gate electrode film being formed of a semiconductor film containing silicon, patterning the floating gate electrode film, the first insulating film, and the semiconductor substrate to form a first structure having a first side surface, exposing the first structure to an atmosphere containing an oxidizing agent, oxidizing that part of the floating gate electrode film which corresponds to a boundary between the first insulating film and the floating gate electrode film using the oxidizing agent, to form a second insulating film having a second dielectric constant smaller than the first dielectric constant and constituting a part of the tunnel insulating film.
    Type: Grant
    Filed: September 22, 2006
    Date of Patent: March 1, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshio Ozawa, Isao Kamioka
  • Patent number: 7888730
    Abstract: A nonvolatile semiconductor memory includes first and second memory cells having a floating gate and a control gate. The floating gate of the first and second memory cells is comprised a first part, and a second part arranged on the first part, and a width of the second part in an extending direction of the control gate is narrower than that of the first part. A first space between the first parts of the first and second memory cells is filled with one kind of an insulator. The control gate is arranged at a second space between the second parts of the first and second memory cells.
    Type: Grant
    Filed: March 19, 2007
    Date of Patent: February 15, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Masayuki Ichige, Fumitaka Arai, Riichiro Shirota, Toshitake Yaegashi, Yoshio Ozawa, Akihito Yamamoto, Ichiro Mizushima, Yoshihiko Saito
  • Patent number: 7883967
    Abstract: A nonvolatile semiconductor memory device includes a gate portion formed by laminating a tunnel insulating film, floating gate electrode, inter-poly insulating film and control gate electrode on a semiconductor substrate, and source and drain regions formed on the substrate. The tunnel insulating film has a three-layered structure having a silicon nitride film sandwiched between silicon oxide films. The silicon nitride film is continuous in an in-plane direction and has 3-coordinate nitrogen bonds and at least one of second neighboring atoms of nitrogen is nitrogen.
    Type: Grant
    Filed: July 24, 2006
    Date of Patent: February 8, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuuichiro Mitani, Daisuke Matsushita, Ryuji Ooba, Isao Kamioka, Yoshio Ozawa
  • Patent number: 7879658
    Abstract: A semiconductor device includes a silicon crystal layer on an insulating layer, the silicon crystal layer containing a crystal lattice mismatch plane, a memory cell array portion on the silicon crystal layer, the memory cell array portion including memory strings, each of the memory strings including nonvolatile memory cell transistors connected in series in a first direction, the memory strings being arranged in a second direction orthogonal to the first direction, the crystal lattice mismatch plane crossing the silicon crystal along the second direction without passing under gates of the nonvolatile memory cell transistors as viewed from a top of the silicon crystal layer, or crossing the silicon crystal along the first direction with passing under gates of the nonvolatile memory cell transistors as viewed from the top of the silicon crystal layer.
    Type: Grant
    Filed: February 29, 2008
    Date of Patent: February 1, 2011
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yoshio Ozawa, Ichiro Mizushima, Takashi Suzuki, Hirokazu Ishida, Yoshitaka Tsunashima
  • Publication number: 20110012190
    Abstract: A semiconductor device includes a semiconductor substrate, a first insulating film formed on the semiconductor substrate, a charge storage layer formed on the first insulating film, a second insulating film formed on the charge storage layer, and a control electrode formed on the second insulating film, the second insulating film including a lower silicon nitride film, a lower silicon oxide film formed on the lower silicon nitride film, an intermediate insulating film formed on the lower silicon oxide film and containing a metal element, the intermediate insulating film having a relative dielectric constant of greater than 7, an upper silicon oxide film formed on the intermediate insulating film, and an upper silicon nitride film formed on the upper silicon oxide film.
    Type: Application
    Filed: September 22, 2010
    Publication date: January 20, 2011
    Inventors: Masayuki Tanaka, Daisuke Nishida, Ryota Fujitsuka, Katsuyuki Sekine, Akihito Yamamoto, Katsuaki Natori, Yoshio Ozawa