Patents by Inventor Tomohiro Yamashita

Tomohiro Yamashita 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).

  • Patent number: 8075126
    Abstract: An ink jet ink contains at least a coloring material and a specific water-soluble organic solvent and has both excellent color developability and excellent humidity resistance. The coloring material exhibits a small (9 or less) color difference ?E value which is determined by a method including a series of specific steps and is represented as the square root of (L1?L2)2+(a1?a2)2+(b1?b2)2. The specific water-soluble organic solvent has an evaporation rate X smaller than that of water and a moisture absorptivity Y, the values of X and Y satisfying the relation of Y?2.8X+10. The content of the specific water-soluble organic solvent is 50 mass % or more of the total amount of water-soluble organic solvents contained in the ink.
    Type: Grant
    Filed: July 23, 2009
    Date of Patent: December 13, 2011
    Assignee: Canon Kabushiki Kaisha
    Inventors: Jun Yoshizawa, Shin-ichi Sato, Kunihiko Nakamura, Tomohiro Yamashita
  • Patent number: 8064164
    Abstract: In a perpendicular magnetic recording head comprising a main magnetic pole layer and a return yoke layer which have respective front end faces exposed at a surface opposing a recording medium and are laminated with a nonmagnetic material layer interposed therebetween on the medium-opposing surface, an end magnetization control layer for generating an exchange-coupling field is provided on the upper or lower side of both end parts in a track width direction of the return yoke layer. The exchange-coupling field fixes magnetization in the end parts to the track width direction.
    Type: Grant
    Filed: May 21, 2008
    Date of Patent: November 22, 2011
    Assignee: TDK Corporation
    Inventors: Tomohiro Yamashita, Hiroshi Kameda, Katsuhiko Otomo
  • Patent number: 8041475
    Abstract: An electric parking brake system includes an electric parking brake mechanism that includes a brake which suppresses rotation of a wheel and an electric motor which applies or releases the brake, and that maintains a vehicle at a standstill while the brake is applied. A parking switch selectively outputs an application command for applying the brake and a release command for releasing the brake in response to an operation of an operating portion for the parking switch. A parking switch malfunction determination unit determines whether the parking switch malfunctions, and a parking brake automatic control unit automatically applies the brake by operating the electric motor when an ignition switch of the vehicle is turned off in response to an operation of an operating portion for the ignition switch, in a case where the parking switch malfunction determination unit determines that the parking switch malfunctions.
    Type: Grant
    Filed: March 25, 2008
    Date of Patent: October 18, 2011
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Kozo Fujita, Tomohiro Yamashita, Hideo Kondo, Hidehiro Yamamoto
  • Publication number: 20110118104
    Abstract: A purpose of the present invention is to provide a dielectric ceramic composition which is available to obtain a multilayer ceramic capacitor having a high specific permittivity and a small temperature change of capacitance. A dielectric ceramic composition comprises a dielectric main component composed of 86.32 to 97.64 mol % of BaTiO3, 0.01 to 10.00 mol % of Y2O3 and 0.01 to 10.00 mol % of MgO and 0.001 to 0.200 mol % of V2O5, 0.01 to 1.0 mol % of more than one kind of a first additive selected from a group composed of MnO, Cr2O3, CO2O3, 0.5 to 10.0 mol % of a second additive which is {Ba?, Ca (1??)}SiO3 (note, 0???1), and Sr 10 to 500 ppm, S: 10 to 50 ppm, Al: 10 to 50 ppm, Fe: 10 to 50 ppm, Zr: 100 to 800 ppm, Y: 10 to 100 ppm, Hf: 10 to 100 ppm to 100 parts by weight of BaTiO3.
    Type: Application
    Filed: October 27, 2010
    Publication date: May 19, 2011
    Inventors: Shinsuke HASHIMOTO, Masato Konno, Momoyo Nitta, Tomohiro Yamashita, Hiroshi Sasaki
  • Patent number: 7929256
    Abstract: A thin film magnetic head is disclosed that is capable of preventing the contact between an element portion and a recording medium and a variation in the amount of protrusion of the element portion. A thin film magnetic head includes: a reproducing element; a recording element that is formed on the reproducing element; a heater that is supplied with power and generates heat to expand at least one of the reproducing element and the recording element such that the reproducing element and/or the recording element protrude toward a recording medium; and a temperature correcting resistor that is connected in parallel to the heater and has a negative resistance temperature coefficient.
    Type: Grant
    Filed: November 14, 2007
    Date of Patent: April 19, 2011
    Assignee: TDK Corporation
    Inventors: Tomohiro Yamashita, Yuya Kakuhari
  • Publication number: 20110057994
    Abstract: A liquid composition used in combination with an ink containing a coloring material is ejected by the action of thermal energy from a recording head including a heating resistor having a protecting layer that is to come into contact with the liquid composition and that contains at least one of a metal and a metal oxide. The liquid composition contains at least either an organic compound having a carboxy group and an amino group or an amine oxide compound, an organic acid having a carboxy group, and water.
    Type: Application
    Filed: September 2, 2010
    Publication date: March 10, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Yukako Tamanuki, Shin-ichi Hakamada, Tomohiro Yamashita, Yasuhito Mori
  • Publication number: 20110057993
    Abstract: A liquid composition used in combination with an ink containing a coloring material is ejected by the action of thermal energy from a recording head including a heating resistor having a protecting layer that contains at least one of a metal and a metal oxide and that is to come into contact with the liquid composition. The liquid composition contains an organic acid having a carboxy group, an alkali metal ion, an organic acid having a sulfonate group, a polyvalent metal ion, and water.
    Type: Application
    Filed: September 2, 2010
    Publication date: March 10, 2011
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Tomohiro Yamashita, Shin-ichi Hakamada
  • Patent number: 7821746
    Abstract: A magnetic head device includes a TMR sensor or a CPP GMR sensor. Shield layers are disposed in contact with the top and bottom of a sensor body. A sensing current is supplied to the sensor body through the shield layers. Lead layers are connected to the shield layers and extend to below conductive pads. Ends of the lead layers are electrically connected to the conductive pads via lifting layers. Heat-conducting layers are disposed below the ends of the lead layers. An insulating layer is formed between the heat-conducting layers and an end surface of a slider body to such a thickness that it does not obstruct heat transfer. Heat applied from a molten solder to the lead layers is released to the slider body through the heat-conducting layers. This prevents the shield layers from being heated to high temperature.
    Type: Grant
    Filed: August 3, 2007
    Date of Patent: October 26, 2010
    Assignee: TDK Corporation
    Inventor: Tomohiro Yamashita
  • Publication number: 20100044802
    Abstract: Provided are a semiconductor device making it possible to form an element region having a dimension close to a designed dimension, restrain a phenomenon similar to gate-induced drain leakage, and further restrain compressive stress to be applied to the element region by oxidation of a conductive film; and a method for manufacturing the semiconductor device. Trenches are made in a main surface of a semiconductor substrate. By oxidizing the wall surface of each of the trenches, a first oxide film is formed on the wall surface. An embedded conductive film is formed to be embedded into the trench. The embedded conductive film is oxidized in an atmosphere containing an active oxidizing species, thereby forming a second oxide film. A third oxide film is formed on the second oxide film by CVD or coating method.
    Type: Application
    Filed: June 30, 2009
    Publication date: February 25, 2010
    Inventors: Masato Ishibashi, Katsuyuki Horita, Tomohiro Yamashita, Takaaki Tsunomura, Takashi Kuroi
  • Publication number: 20090295886
    Abstract: An ink jet ink contains at least a coloring material and a specific water-soluble organic solvent and has both excellent color developability and excellent humidity resistance. The coloring material exhibits a small (9 or less) color difference ?E value which is determined by a method including a series of specific steps and is represented as the square root of (L1?L2)2+(a1?a2)2+(b1?b2)2. The specific water-soluble organic solvent has an evaporation rate X smaller than that of water and a moisture absorptivity Y, the values of X and Y satisfying the relation of Y?2.8X+10. The content of the specific water-soluble organic solvent is 50 mass % or more of the total amount of water-soluble organic solvents contained in the ink.
    Type: Application
    Filed: July 23, 2009
    Publication date: December 3, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Jun Yoshizawa, Shin-ichi Sato, Kunihiko Nakamura, Tomohiro Yamashita
  • Patent number: 7611571
    Abstract: An ink having a cyan color is provided which can form images excellent in ozone resistance in such a high level as to exceed anticipation and having a preferable color tone. The ink includes at least two coloring materials of a first coloring material and a second coloring material, wherein the first coloring material is a compound having a copper phthalocyanine skeleton with a specific structure and the second coloring material is a compound having a copper phthalocyanine skeleton with a specific structure that is different from the first coloring material.
    Type: Grant
    Filed: April 28, 2008
    Date of Patent: November 3, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Tomohiro Yamashita, Jun Yoshizawa, Daiji Okamura
  • Publication number: 20090264276
    Abstract: A method of producing fine and uniform barium titanate particles having high crystallinity by performing a heat treatment on titanium dioxide and barium carbonate having a specific surface area of at least 20 m2/g and low rutile ratio; comprising the steps of preparing mixed powder by mixing titanium dioxide particles having a rutile ratio of 30% or lower and a specific surface area of 20 m2/g or more and barium carbonate particles, a first heat treatment step for performing a heat treatment on the mixed powder to generate a barium titanate phase having an average thickness of at least 3 nm continuously on surfaces of titanium dioxide particles by an amount of 15 wt % or more, and a second heat treatment step for performing a heat treatment at 800° C. to 1000° C.
    Type: Application
    Filed: April 14, 2009
    Publication date: October 22, 2009
    Applicant: TDK CORPORATION
    Inventors: Tomohiro Yamashita, Tomoaki Nonaka, Shinsuke Hashimoto, Hiroshi Sasaki, Yoshinori Fujikawa
  • Publication number: 20090253571
    Abstract: The invention intends to provide a precursor material for manufacturing dielectric fine particles, typically barium titanate particles, having uniform particle diameter and particle characteristics, and manufacturing method thereof. The composite oxide particles according to the present invention, which is the precursor material for barium titanate particles, substantially consists of 75 to 25 mol % barium titanate phase and 25 to 75 mol % titanium dioxide phase, and is produced by heat treating a mixed powder consisting of 100 mol % titanium dioxide particles and 25 to 75 mol % barium compound particles at 500° C. or more and less than 900° C.
    Type: Application
    Filed: March 26, 2009
    Publication date: October 8, 2009
    Applicant: TDK CORPORATION
    Inventors: Shinsuke Hashimoto, Tomohiro Yamashita, Tomoaki Nonaka, Hiroshi Sasaki
  • Publication number: 20090202426
    Abstract: Method for producing dielectric powder comprising steps of; preparing titanium dioxide powder having sum of surface chlorine amount and internal chlorine amount of 2000 ppm or less, surface chlorinity of 120 ppm or less, rutilated ratio of 30% or less, BET specific surface area of 30 m2/g or more; preparing barium compound powder to produce barium oxide by thermolysis; preparing powder mixture of titanium dioxide powder and barium compound powder; and heat treating the powder mixture.
    Type: Application
    Filed: January 23, 2009
    Publication date: August 13, 2009
    Applicant: TDK CORPORATION
    Inventors: Tomohiro Yamashita, Hiroshi Sasaki, Tomoaki Nonaka, Shinsuke Hashimoto
  • Patent number: 7550037
    Abstract: Provided is a black ink which provides an image with excellent color tone, little color tone change after a light fastness test and excellent balance of color tone change and light fastness. The black ink further provides an image with a gradation property having a color tone close to a neutral color tone even before and after a light fastness test.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: June 23, 2009
    Assignee: Canon Kabushiki Kaisha
    Inventors: Kumiko Mafune, Tomohiro Yamashita, Jun Yoshizawa
  • Publication number: 20090011130
    Abstract: Provided is a black ink which provides an image with excellent color tone, little color tone change after a light fastness test and excellent balance of color tone change and light fastness. The black ink further provides an image with a gradation property having a color tone close to a neutral color tone even before and after a light fastness test. The ink contains at least a compound represented by the general formula (I) as a first coloring material, a compound represented by the general formula (II) as a second coloring material and a compound represented by the general formula (III) as a third coloring material.
    Type: Application
    Filed: June 10, 2008
    Publication date: January 8, 2009
    Applicant: CANON KABUSHIKI KAISHA
    Inventors: Kumiko Mafune, Tomohiro Yamashita, Jun Yoshizawa
  • Publication number: 20080308869
    Abstract: The technology which can control a threshold value appropriately, adopting the material which fitted each gate electrode of the MOS structure from which a threshold value differs without making the manufacturing process complicated, and does not make remarkable diffusion to the channel region from the gate electrode is offered. The PMOS transistor has a gate electrode GP, and an N type well which confronts each other via a gate insulating film with this, and the NMOS transistor has a gate electrode GN, and an P type well which confronts each other via a gate insulating film with this. While gate electrode GN includes a polycrystalline silicon layer, gate electrode GP is provided with the laminated structure of a metal layer/polycrystalline silicon layer.
    Type: Application
    Filed: August 20, 2008
    Publication date: December 18, 2008
    Applicant: Renesas Technology Corp.
    Inventors: Hidekazu ODA, Takahisa Eimori, Jiro Yugami, Takahiro Maruyama, Tomohiro Yamashita, Yukio Nishida, Shinichi Yamanari, Takashi Hayashi, Kenichi Mori
  • Publication number: 20080297951
    Abstract: In a perpendicular magnetic recording head comprising a main magnetic pole layer and a return yoke layer which have respective front end faces exposed at a surface opposing a recording medium and are laminated with a nonmagnetic material layer interposed therebetween on the medium-opposing surface, an end magnetization control layer for generating an exchange-coupling field is provided on the upper or lower side of both end parts in a track width direction of the return yoke layer. The exchange-coupling field fixes magnetization in the end parts to the track width direction.
    Type: Application
    Filed: May 21, 2008
    Publication date: December 4, 2008
    Applicant: TDK CORPORATION
    Inventors: Tomohiro YAMASHITA, Hiroshi KAMEDA, Katsuhiko OTOMO
  • Publication number: 20080291580
    Abstract: In a perpendicular magnetic recording head having a main magnetic pole layer and a return yoke layer which are laminated with a magnetic gap layer interposed therebetween on a medium-opposing surface, a pair of side coils constituting respective electrically closed circuits on a surface parallel to the medium-opposing surface are provided on both sides in a track width direction of a magnetic pole part of the main magnetic pole layer. When a leakage magnetic field spreading from the magnetic pole part of the main magnetic pole layer passes through the pair of side coils, the pair of side coils generate a demagnetizing field in such a direction as to cancel a magnetic flux change thereof, thereby preventing the leakage magnetic flux from spreading.
    Type: Application
    Filed: May 5, 2008
    Publication date: November 27, 2008
    Applicant: TDK CORPORATION
    Inventor: Tomohiro YAMASHITA
  • Publication number: 20080285179
    Abstract: A magnetic head device includes a TMR sensor or a CPP GMR sensor. Shield layers are disposed in contact with the top and bottom of a sensor body. A sensing current is supplied to the sensor body through the shield layers. Lead layers are connected to the shield layers and extend to below conductive pads. Ends of the lead layers are electrically connected to the conductive pads via lifting layers. Heat-conducting layers are disposed below the ends of the lead layers. An insulating layer is formed between the heat-conducting layers and an end surface of a slider body to such a thickness that it does not obstruct heat transfer. Heat applied from a molten solder to the lead layers is released to the slider body through the heat-conducting layers. This prevents the shield layers from being heated to high temperature.
    Type: Application
    Filed: August 3, 2007
    Publication date: November 20, 2008
    Inventor: Tomohiro Yamashita