Patents by Inventor Fumihito Oka

Fumihito Oka 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: 20110024151
    Abstract: A cable includes a plurality of stranded wires substantially arranged annularly and each formed by twisting a plurality of conductor wires, and an inclusion disposed substantially at a center of the plurality of stranded wires. The inclusion includes spiral grooves, each of which being provided for fitting each of the stranded wires thereinto, that are each shaped according to a part of an outer surface of the stranded wires and separated by a dividing wall provided for preventing two adjacent stranded wires of the plurality of stranded wires from contacting each other.
    Type: Application
    Filed: May 7, 2010
    Publication date: February 3, 2011
    Inventors: Hirotaka Eshima, Fumihito Oka, Ryoji Mizutani, Kenji Ishida
  • Publication number: 20100270054
    Abstract: A cable having a cable structure comprising a stranded wire formed by stranding a plurality of stranded conductors and an inclusion that is more deformable than the stranded conductors, wherein a plurality of stranded conductors are arranged on a circumference of the inclusion.
    Type: Application
    Filed: April 14, 2010
    Publication date: October 28, 2010
    Applicants: HITACHI CABLE, LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Fumihito OKA, Hirotaka ESHIMA, Takafumi KAI, Ryoji MIZUTANI, Kenji ISHIDA
  • Publication number: 20100237745
    Abstract: A sensor or actuator includes a piezoelectric thin film device including a lower electrode, a piezoelectric thin film and an upper electrode, and a voltage detecting device connected between the lower and upper electrodes of the piezoelectric thin film device. The piezoelectric thin film is formed of an alkali niobium oxide-based perovskite material expressed by (K1-xNax)NbO3 (0<x<1), and a dependency of the piezoelectric constant d31 of the piezoelectric thin film on applied electric field [=|(d31 under 70 kV/cm)?(d31 under 7 kV/cm)|/|d31 under 70 kV/cm|] is 0.20 or less.
    Type: Application
    Filed: April 30, 2010
    Publication date: September 23, 2010
    Inventors: Kenji Shibata, Fumihito Oka
  • Publication number: 20100156247
    Abstract: A substrate has a first thermal expansion coefficient and a piezoelectric thin film has a second thermal expansion coefficient. The piezoelectric thin film is mainly composed of a potassium sodium niobate (K,Na)NbO3 with a perovskite structure. A curvature radius of a warping of the substrate provided with the piezoelectric thin film due to difference between the first and the second thermal expansion coefficients is 10 m or more at room temperature. The piezoelectric thin film has a thickness of 0.2 ?m to 10 ?m. The piezoelectric thin film is oriented in one of plane orientations (001), (110), and (111).
    Type: Application
    Filed: February 22, 2010
    Publication date: June 24, 2010
    Applicant: HITACHI CABLE, LTD.
    Inventors: Kenji Shibata, Fumihito Oka
  • Publication number: 20100141099
    Abstract: A piezoelectric thin film element includes a bottom electrode, a piezoelectric layer and a top electrode on a substrate. The piezoelectric layer includes as a main phase a perovskite-type oxide represented by (NaxKyLiz)NbO3 (0<x<1, 0<y<1, 0<z<0.2, x+y+z=1), and the bottom electrode includes a surface roughness of not more than 0.86 nm in arithmetic mean roughness Ra or not more than 1.1 nm in root mean square roughness Rms.
    Type: Application
    Filed: October 16, 2009
    Publication date: June 10, 2010
    Applicant: HITACHI CABLE, LTD.
    Inventors: Kazufumi Suenaga, Kenji Shibata, Fumihito Oka, Hideki Sato
  • Patent number: 7732996
    Abstract: A piezoelectric thin film device according to the present invention comprises a lower electrode, a piezoelectric thin film and an upper electrode, in which the piezoelectric thin film is formed of an alkali niobium oxide-based perovskite material expressed by (K1-xNax)NbO3 (0<x<1), and in which dependency of the piezoelectric constant d31 of the piezoelectric thin film on applied electric field [=|(d31 under 70 kV/cm)?(d31 under 7 kV/cm)|/|d31 under 70 kV/cm|] is 0.20 or less.
    Type: Grant
    Filed: January 23, 2009
    Date of Patent: June 8, 2010
    Assignee: Hitachi Cable, Ltd.
    Inventors: Kenji Shibata, Fumihito Oka
  • Patent number: 7710003
    Abstract: A substrate has a first thermal expansion coefficient and a piezoelectric thin film has a second thermal expansion coefficient. The piezoelectric thin film is mainly composed of a potassium sodium niobate (K,Na)NbO3 with a perovskite structure. A curvature radius of a warping of the substrate provided with the piezoelectric thin film due to difference between the first and the second thermal expansion coefficients is 10 m or more at room temperature.
    Type: Grant
    Filed: March 3, 2008
    Date of Patent: May 4, 2010
    Assignee: Hitachi Cable, Ltd.
    Inventors: Kenji Shibata, Fumihito Oka
  • Patent number: 7701121
    Abstract: A piezoelectric substance has a substrate, an electrode formed on the substrate, and a piezoelectric film formed on the electrode. The piezoelectric film is formed of crystals having a main phase of (NaxKyLiz)NbO3 (0<x<1, 0<y<1, 0?z?0.1, x+y+z=1). The piezoelectric film is a polycrystalline thin film preferentially oriented to either or both of <001> and <110> crystalline axes in the direction normal to the substrate surface, and the axes of its crystals oriented to each crystalline axis are also formed in the same direction in the in-plane direction of the substrate.
    Type: Grant
    Filed: October 16, 2007
    Date of Patent: April 20, 2010
    Assignee: Hitachi Cable, Ltd.
    Inventors: Fumihito Oka, Kenji Shibata
  • Publication number: 20090236944
    Abstract: A piezoelectric thin film element includes a substrate, a lower electrode, a piezoelectric thin film, and an upper electrode. The lower electrode, the piezoelectric thin film and the upper electrode are formed on the substrate. The piezoelectric thin film includes a polycrystal thin film including crystal grains, an alkali niobium oxide based perovskite structure represented by a general formula: (K1-xNax)NbO3 (0.4<x<0.7), a film thickness of not less than 1 ?m and not more than 10 ?m, a columnar structure configured by the crystal grains, a majority of the crystal grains including a shape in a cross-section direction thereof longer than in a plane direction of the substrate, and an average crystal grain size of not less than 0.1 ?m and not more than 1.0 ?m in the plane direction of the substrate.
    Type: Application
    Filed: May 27, 2009
    Publication date: September 24, 2009
    Applicant: HITACHI CABLE, LTD.
    Inventors: Kenji Shibata, Fumihito Oka
  • Publication number: 20090191431
    Abstract: To smoothly deliver a thermal energy required in an active site of a catalyst carried on a carrier. A method of manufacturing a catalyst carrier of the present invention includes the steps of: forming a mixed thin film in which at least metal and ceramics are mixed on a metal base, by spraying aerosol, with metal powders and ceramics powders mixed therein, on the metal base; and making the mixed thin film porous, by dissolving the metal of the mixed thin film into acid or alkaline solution to remove this metal.
    Type: Application
    Filed: January 28, 2009
    Publication date: July 30, 2009
    Applicant: HITACHI CABLE, LTD.
    Inventors: Mineo Washima, Kenji Shibata, Fumihito Oka
  • Publication number: 20090189482
    Abstract: A piezoelectric thin film device according to the present invention comprises a lower electrode, a piezoelectric thin film and an upper electrode, in which the piezoelectric thin film is formed of an alkali niobium oxide-based perovskite material expressed by (K1-xNax)NbO3 (0<x<1), and in which dependency of the piezoelectric constant d31 of the piezoelectric thin film on applied electric field [=|(d31 under 70 kV/cm)?(d31 under 7 kV/cm)|/|d31 under 70 kV/cm|] is 0. 20 or less.
    Type: Application
    Filed: January 23, 2009
    Publication date: July 30, 2009
    Inventors: Kenji SHIBATA, Fumihito Oka
  • Publication number: 20090189490
    Abstract: A piezoelectric thin film device according to the present invention comprises a lower electrode, a piezoelectric thin film and a upper electrode, in which the piezoelectric thin film is formed of an alkali niobium oxide-based perovskite material expressed by (K1-xNax)NbO3 (0 <x<1), and in which a (001)KNN plane diffraction peak of the piezoelectric thin film indicates an angle 2? from 22.1° to 22.5° in an X-ray diffraction 2?/? measurement to a surface of the piezoelectric thin film, and the (001)KNN plane diffraction peak occupies 80% or more of diffraction peaks of the piezoelectric thin film.
    Type: Application
    Filed: January 23, 2009
    Publication date: July 30, 2009
    Inventors: Kenji SHIBATA, Fumihito Oka
  • Publication number: 20090096328
    Abstract: A substrate has a first thermal expansion coefficient and a piezoelectric thin film has a second thermal expansion coefficient. The piezoelectric thin film is mainly composed of a potassium sodium niobate (K,Na)NbO3 with a perovskite structure. A curvature radius of a warping of the substrate provided with the piezoelectric thin film due to deference between the first and the second thermal expansion coefficients is 10 m or more at room temperature.
    Type: Application
    Filed: March 3, 2008
    Publication date: April 16, 2009
    Applicant: HITACHI CABLE, LTD.
    Inventors: Kenji Shibata, Fumihito Oka
  • Patent number: 7518293
    Abstract: A piezoelectric thin-film element formed with a niobate lithium potassium sodium thin-film having a well-developed Perovskite structure and having an excellent piezoelectric characteristic. The piezoelectric thin-film 4 is a dielectric thin-film composed of a alkaline-niobic oxide represented by (Nax1Ky1Liz1) NbO3 (0<x1<1, 0<y1<1, 0?z1<1, x1+y1+z1=1) and having a Perovskite structure, and the base dielectric thin film 6 composed of a alkaline-niobic oxide represented by (Nax2Ky2Liz2) NbO3 (0<x2<1, 0<y2<1, 0?z2<1, x2+y2+z2=1) and having a Perovskite structure is provided between the lower electrode 3 and the piezoelectric thin-film 4.
    Type: Grant
    Filed: June 1, 2007
    Date of Patent: April 14, 2009
    Assignee: Hitachi Cable, Ltd.
    Inventors: Kenji Shibata, Fumihito Oka
  • Publication number: 20090075066
    Abstract: A piezoelectric film formed above a Si substrate. The piezoelectric film is formed of a potassium sodium niobate expressed by a general formula (K,Na)NbO3 with perovskite structure. A film thickness of the piezoelectric film is within a range from 0.3 ?m to 10 ?m. An intermediate film is formed between the Si substrate and the piezoelectric film. The intermediate film generates a stress in a compressive direction in the piezoelectric film.
    Type: Application
    Filed: March 3, 2008
    Publication date: March 19, 2009
    Applicant: Hitachi Cable, Ltd.
    Inventors: Kenji Shibata, Fumihito Oka
  • Publication number: 20080303377
    Abstract: A piezoelectric substance has a substrate, an electrode formed on the substrate, and a piezoelectric film formed on the electrode. The piezoelectric film is formed of crystals having a main phase of (NaxKyLiz)NbO3 (0<x<1, 0<y<1, 0?z?0.1, x+y+z=1). The piezoelectric film is a polycrystalline thin film preferentially oriented to either or both of <001> and <110> crystalline axes in the direction normal to the substrate surface, and the axes of its crystals oriented to each crystalline axis are also formed in the same direction in the in-plane direction of the substrate.
    Type: Application
    Filed: October 16, 2007
    Publication date: December 11, 2008
    Applicant: HITACHI CABLE, LTD.
    Inventors: Fumihito OKA, Kenji SHIBATA
  • Publication number: 20070278904
    Abstract: A piezoelectric thin-film element formed with a niobate lithium potassium sodium thin-film having a well-developed Perovskite structure and having an excellent piezoelectric characteristic. The piezoelectric thin-film 4 is a dielectric thin-film composed of a alkaline-niobic oxide represented by (Nax1Ky1Liz1) NbO3 (0<x1<1, 0<y1<1, 0?z1<1, x1+y1+z1=1) and having a Perovskite structure, and the base dielectric thin film 6 composed of a alkaline-niobic oxide represented by (Nax2Ky2Liz2) NbO3 (0<x2<1, 0<y2<1, 0?z2<1, x2+y2+z2=1) and having a Perovskite structure is provided between the lower electrode 3 and the piezoelectric thin-film 4.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 6, 2007
    Inventors: KENJI SHIBATA, Fumihito Oka
  • Patent number: 6815788
    Abstract: A transparent electrode is provided on a glass substrate, and an amorphous silicon layer is provided on the transparent electrode. A nickel layer as a metal catalyst element is provided in or so as to contact with the surface of the amorphous silicon layer, followed by heat treatment to crystallize the amorphous silicon layer, thereby forming a p-type polycrystalline silicon layer. This polycrystalline silicon layer is crystallographically oriented and has high crystallinity. The polycrystalline silicon layer is used as a seed crystal to form a p-type polycrystalline silicon layer which is crystallographically oriented and, at the same time, has high crystallinity. Further, an i-type polycrystalline silicon layer and an n-type polycrystalline silicon layer are successively formed on the polycrystalline silicon layer.
    Type: Grant
    Filed: August 10, 2001
    Date of Patent: November 9, 2004
    Assignee: Hitachi Cable Ltd.
    Inventors: Fumihito Oka, Shinichi Muramatsu, Yasushi Minagawa
  • Patent number: 6777714
    Abstract: Concave and convex are formed on the substrate 1, the amorphous silicon layer 4 is formed on the metallic catalyst 3 dispersed and arranged in a dotted shape in the concave portion of the concave and convex, the crystal phases 5 having respective orientations from the metallic catalyst 3 are grown, further the crystal phases 5 are integrated with each other by continuing heat treatment and the polycrystalline silicon layer 6 is formed. A crystalline silicon semiconductor device and its method for fabrication which are costly advantageous and capable of efficiently forming the polycrystalline silicon layer of a predetermined thickness needed as a semiconductor device are provided.
    Type: Grant
    Filed: February 9, 2001
    Date of Patent: August 17, 2004
    Assignee: Hitachi Cable, Ltd.
    Inventors: Shinichi Muramatsu, Yasushi Minagawa, Fumihito Oka, Susumu Takahashi, Yoshiaki Yazawa
  • Patent number: 6703289
    Abstract: A plurality of linear catalytic metal element portions are arranged at predetermined intervals just on or just beneath an amorphous silicon layer, and, in this state, the amorphous silicon layer is heat treated to crystallize the amorphous silicon layer and consequently to form a polycrystalline silicon layer. This construction can realize the provision of a method for the formation of an evenly oriented, high-quality crystalline silicon layer in a large area, and a crystalline silicon semiconductor device produced by this method.
    Type: Grant
    Filed: December 10, 2001
    Date of Patent: March 9, 2004
    Assignee: Hitachi Cable, Ltd.
    Inventors: Shinichi Muramatsu, Yasushi Minakawa, Fumihito Oka, Tadashi Sasaki