Patents by Inventor Akio Takada

Akio Takada 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: 20050036234
    Abstract: A HDD system includes one or more MEMS spindle motors, and one or more magnetic heads. Each spindle motor includes a rotor 127, 210 and a stator 207. The rotor 127, 210 carries a film of magnetic film, and a head 211 is arranged to communicate data with the magnetic film. The rotors 127, 210 are formed by MEMS technology. Rotor elements 6 are formed within a substrate 4, and the substrate is subsequently cut to sigulate the rotor elements 6, and turn them into rotors 127, 210.
    Type: Application
    Filed: August 10, 2004
    Publication date: February 17, 2005
    Inventors: Akio Takada, Ching Yeo, Kanzo Okada, Shun Kayama
  • Publication number: 20040119354
    Abstract: A MEMS (micro-electromechanical system) device having a rotor 44, a stator 43 and a shaft 27 connected to the stator 43 and around which the rotor 44 rotates. Grooves 47 are formed in a portion of the rotor 44, such that when the rotor 44 rotates an air bearing is formed for supporting the rotor 44 and maintaining its distance from the shaft 27 and stator 43. The rotor 44 is formed from joining two substrates 13, 23. One of the substrates 13 includes a surface having openings 7 including frustoconical walls, and one of the substrates 23 includes a surface having openings 15 including walls perpendicular to the surface of the substrate. The openings in the two substrates are in register with each other so that pairs of the openings form chambers 24. Each chamber 24 is provided with a shaft 27, which is positioned with a wide section of the shaft trapped in the chamber 24. The wide section of the shaft has a frustoconical surface facing the frustoconical walls of the chamber 24.
    Type: Application
    Filed: December 8, 2003
    Publication date: June 24, 2004
    Inventors: Akio Takada, Ching Biing Yeo, Cheow Tong Cheng, Shun Kayama
  • Patent number: 6722206
    Abstract: An oscillation sensing device includes a magnetised member mounted on a substrate. A magneto-electrical material is mounted on the substrate such that the magneto-electrical material is subjected to the magnetic field generated by the magnetised member. A movable member is mounted for oscillation in response to an oscillating force. Oscillation of the movable member causes a change in the magnetic field experienced by the magneto-electrical material and an electrical property of the electro-electrical material changes in response to changes in the magnetic field experienced by the magneto-electrical material due to oscillation of the movable member.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: April 20, 2004
    Assignee: Sony Precision Engineering Center (Singapore) PTE Ltd.
    Inventor: Akio Takada
  • Publication number: 20030200820
    Abstract: The present invention relates to a force sensing device, and in particular to a force sensing device for sensing an oscillating force or for application as a filter. In general terms, the invention proposes a force sensing device having a magneto electric material and a magnetic element moveable relative thereto in response to an applied force. The magneto electric material is exposed to the magnetic field of the magnetic element which has a magnetisation direction parallel to the direction of the movement.
    Type: Application
    Filed: February 13, 2003
    Publication date: October 30, 2003
    Inventors: Akio Takada, Minoru Ikarashi
  • Publication number: 20020178831
    Abstract: An oscillation sensing device (1) includes a magnetized member (6) mounted on a substrate (4). A magneto-electrical material (7) is mounted on the substrate (4) such that the magneto-electrical material (7) is subjected to the magnetic field generated by the magnetized member (6). A movable member (3) is mounted for oscillation (8) in response to an oscillating force. Oscillation of the movable member (3) causes a change in the magnetic field experienced by the magneto-electrical material (7) and an electrical property of the magneto-electrical material (7) changes in response to changes in the magnetic field experienced by the magneto-electrical material (7) due to oscillation of the movable member (3).
    Type: Application
    Filed: May 28, 2002
    Publication date: December 5, 2002
    Inventor: Akio Takada
  • Publication number: 20020066177
    Abstract: Providing a method for manufacturing magneto-resistive effect type magnetic heads which can suppress the electrostatic destructions due to the ESD and EOS, and can properly manufacture magneto-resistive effect type magnetic heads without deteriorating characteristics. In a layered type magnetic head forming step S1, a short circuit pattern for making a short circuit in the element circuit of an MR head is formed. And the short circuit pattern is cut off before a fine polishing step S4, or at a wafer bar cutting off step S6.
    Type: Application
    Filed: July 5, 2001
    Publication date: June 6, 2002
    Applicant: SONY CORPORATION
    Inventors: Akio Takada, Katsuki Sasaki, Toshihiko Shimizui, Kohki Matsuki
  • Patent number: 6331924
    Abstract: An MR head using an MR element as a magnetic detector and having head elements formed on a substrate is provided which comprises a capacitor connected in parallel to the MR element. The substrate is made of a conductive material to serve as one of electrodes forming the capacitor. Owing to this construction, the MR element of the MR head is hardly broken down due to an ESD or EOS.
    Type: Grant
    Filed: April 2, 1999
    Date of Patent: December 18, 2001
    Assignee: Sony Corporation
    Inventor: Akio Takada
  • Patent number: 6120920
    Abstract: A magneto-resistive effect type magnetic head employing a spin valve film in which the direction of magnetization of a free layer is constant even in the absence of an external magnetic field to assure magnetic stability. The magneto-resistive effect type magnetic head includes a magneto-resistive effect film of a planar substantially rectangular configuration, having its longitudinal direction substantially perpendicular to a magnetic recording medium sliding surface, a first electrode connected to a longitudinal end of the magneto-resistive effect film, a second electrode connected to the other longitudinal end of the magneto-resistive effect film and hard magnetic films arranged on both ends along the width of the magneto-resistive effect film. The magneto-resistive effect film is made up of at least a first ferromagnetic layer, a non-magnetic layer, a second ferromagnetic layer and an anti-ferromagnetic layer, layered together.
    Type: Grant
    Filed: November 20, 1998
    Date of Patent: September 19, 2000
    Assignee: Sony Corporation
    Inventors: Akio Takada, Moriaki Abe, Tadayuki Honda, Hiroaki Narisawa, Takuji Shibata
  • Patent number: 6064551
    Abstract: The present invention provides a high quality magnetoresistance effect type magnetic head having an increased reproduction output and capable of applying a uniform bias magnetic field to a magnetoresistance effect layer without increasing an impedance. The magnetoresistance effect type magnetic head according to the present invention includes: a magnetic layer 11 magnetized approximately in a vertical direction to a plane 14 opposing to a magnetic recording medium; a non-magnetic insulation layer 12 formed on the magnetic layer 11; and a magnetoresistance effect layer 13 formed on the non-magnetic insulation layer 12 and exhibiting the magnetoresistance effect. In the longitudinal type magnetoresistance effect type magnetic head according to the present, the detection current supplied to a magnetoresistance element is prevented from flowing into a hard magnetic film to lower the head reproduction output.
    Type: Grant
    Filed: February 25, 1998
    Date of Patent: May 16, 2000
    Assignee: Sony Corporation
    Inventors: Akio Takada, Takuji Shibata, Moriaki Abe, Tadayuki Honda, Kenji Yazawa, Hiroaki Narisawa
  • Patent number: 5875078
    Abstract: In a magnetoresistance thin film magnetic head, a bias conductor and a magnetoresistive magnetic sensing section are electrically connected to each other in series. Further, the bias conductor (7) is formed in such a pattern as to have a width and distance from a magnetic recording medium facing surface which become larger as it is away from a portion transversing the magnetoresistive magnetic sensing section.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: February 23, 1999
    Assignee: Sony Corporation
    Inventors: Hideo Suyama, Takuji Shibata, Norio Saito, Mamoru Sasaki, Akio Takada, Jin Sato, Shuichi Haga
  • Patent number: 5875079
    Abstract: A thin-film magnetic head in which magnetic stability of a magnetoresistance effect film is improved for further stabilizing the playback output. The thin-film magnetic head includes a magnetoresistance effect stabilizing layer 11 having a hard magnetic member 11d and a soft magnetic member 11e, a non-magnetic insulating layer 12 layered on the magnetoresistance effect stabilizing layer 11, a magnetoresistance effect layer 13 layered on the non-magnetic insulating layer 12 and a pair of electrodes connected on both ends of the magnetoresistance effect layer 13. Under the effect of the hard magnetic member 11d, the magnetoresistance effect layer 13 is reduced in coercivity and, under the effect of the soft magnetic member 11e, the magnetic filed which proves to be the saturation flex density is increased.
    Type: Grant
    Filed: March 14, 1997
    Date of Patent: February 23, 1999
    Assignee: Sony Corporation
    Inventors: Tadayuki Honda, Takuji Shibata, Akio Takada
  • Patent number: 5867350
    Abstract: A magneto-resistance effect magnetic head having a uniform bias distribution and adapted for avoiding shorting between a magneto-resistance device and a bias conductor wherein a magneto-resistance device 5 and a bias conductor 6 for applying a bias magnetic field to the magneto-resistance device 5 are interposed between a lower shielding magnetic member 1 and an upper shielding magnetic member 2. The bias conductor is embedded in a groove formed in the shielding magnetic member provided on the opposite side of forward and rear electrodes with respect to the magneto-resistance effect device.
    Type: Grant
    Filed: March 18, 1997
    Date of Patent: February 2, 1999
    Assignee: Sony Corporation
    Inventors: Shuichi Haga, Mamoru Sasaki, Hideo Suyama, Nobuhiro Sugawara, Akio Takada, Mikiya Kurosu, Chizuru Ohshima
  • Patent number: 5828527
    Abstract: A thin-film magnetic head improves magnetic stability of a magnetoresistance effect film 13 for further stabilizing the playback output. The thin-film magnetic head has a magnetoresistance effect stabilizing layer 11, a non-magnetic layer 12 and a magnetoresistance effect layer 13 exhibiting the magnetoresistance effect. The magnetoresistance effect stabilizing layer 11 has a hard magnetic film and a soft magnetic film. The magnetoresistance effect stabilizing layer 11 has a non-magnetic film 11c of a non-magnetic material in at least a partial area between a hard magnetic film 11b and a soft magnetic film 11d. In the thin-film magnetic head, there is produced a stable magnetostatic coupling action between the magnetoresistance effect stabilizing layer 11 and the magnetoresistance effect layer 13 for increasing the magnetic stability of the magnetoresistance effect layer 13 operating as a magnetically sensitive portion.
    Type: Grant
    Filed: March 12, 1997
    Date of Patent: October 27, 1998
    Assignee: Sony Corporation
    Inventors: Akio Takada, Tadayuki Honda, Takuji Shibata, Moriaki Abe
  • Patent number: 5708542
    Abstract: A magnetoresistance effect thin-film magnetic head superior in magnetic stability and capable of developing a high playback power. The thin-film magnetic head has a magnetoresistance effect stabilizing layer 11 inclusive a diamagnetic film or a hard magnetic film, a non-magnetic insulating layer 12 and a magnetoresistance effect layer 13 inclusive of a magnetoresistance effect film, layered together to form a magnetoresistance effect element 3. The thin-film magnetic head also has a non-magnetic insulating layer 4 arranged on a lateral surface of the magnetoresistance effect element 3 and a pair of electrodes connected to the magnetoresistance effect layer 13 on both ends of the upper surface of the magneto-resistance effect element 3. The playback signals are detected by the magnetoresistance effect of the magnetoresistance effect layer 13.
    Type: Grant
    Filed: July 24, 1996
    Date of Patent: January 13, 1998
    Assignee: Sony Corporation
    Inventors: Akio Takada, Takuji Shibata, Tadayuki Honda
  • Patent number: 5695657
    Abstract: A magneto-resistance effect type thin-film magnetic head for detecting reproduced signals by the magneto-resistance effect, which is suitable for detecting reproduced signals by magneto-resistance effects, is disclosed. The thin-film magnetic head includes a two-layered magneto-resistance effect element made up of a first magneto-resistance effect film and a second magneto-resistance effect film of substantially the same width as the first magneto-resistance effect film, layered with a non-magnetic insulating film in-between. Since the magneto-static coupling is produced between the first and second MR films, the magnetic state between the first and second MR films is stabilized. The film thickness contributing to the playback output can be reduced as in the case of a single-layer magnetic head constituted by a single-layer MR film for realizing a high playback output.
    Type: Grant
    Filed: June 27, 1996
    Date of Patent: December 9, 1997
    Assignee: Sony Corporation
    Inventors: Takuji Shibata, Yoshihiro Kanno, Tadayuki Honda, Akio Takada, Yukio Kondo, Tadao Suzuki
  • Patent number: 5671105
    Abstract: A magneto-resistive effect thin-film magnetic head including a magnetic layer exhibiting a magneto-resistive effect, the magnetic layer having a longitudinal axis and two ends positioned at opposite ends of the longitudinal axis, and a flux guide layer of a high magnetic permeability soft magnetic material formed at an overlapping one end of the magnetic layer, the flux guide layer having two opposite ends longitudinally aligned with the longitudinal axis of the magnetic layer. On overlapping both ends of the flux guide layer, there are formed separate hard fills operating as permanent magnets.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: September 23, 1997
    Assignee: Sony Corporation
    Inventors: Nobuhiro Sugawara, Hideo Suyama, Akio Takada
  • Patent number: 5617276
    Abstract: A magneto-resistance effect thin-film magnetic head with a flux guide for efficiently guiding the signal magnetic flux from the magnetic recording medium to a magneto-resistance effect film. The flux guide is made up of a laminated structure of alternate layers of permalloy and Ti so that the number of the permalloy films is two or more. The flux guide may be formed by an underlying layer and the laminated structure formed on the underlying layer. The film thickness T1 of the permalloy film and the film thickness T2 of the Ti film preferably are such that 0 nm<T1<50 nm and 0 nm<T2<6 nm. The flux guide of the MR head may be formed easily and is excellent in magnetic characteristics. The playback signal output of the MR head may be improved without complicating the production process of the MR head.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: April 1, 1997
    Assignee: Sony Corporation
    Inventors: Akio Takada, Kazutoshi Asada
  • Patent number: 5498217
    Abstract: A control method is provided for an engine for a vehicle. The engine is arranged in association with a fluid coupling having a clutch. According to the control method, the state of engagement of the clutch is first detected. In the next step, it is determined whether or not the vehicle is in a predetermined decelerated operation state. When the clutch has been detected to be in a predetermined state of engagement in the clutch engagement state detection step and in addition, the vehicle has been determined to be in the predetermined decelerated operation state in the decelerated operation state determination step, an output of the engine is increased in the subsequent step.
    Type: Grant
    Filed: September 13, 1994
    Date of Patent: March 12, 1996
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Ikuo Maruyama, Yoshimasa Nagayoshi, Hisaji Nakamura, Akio Takada, Koichi Kato, Sadamu Oyaide, Tatsuya Shimazaki, Yoshihiro Konno
  • Patent number: 4678736
    Abstract: Optical recording media for storing information on which bits are formed by applying radiant energy to a polydiacetylene thin film supported by a substrate, so that the main chain structure of the polydiacetylene is transformed into another form or forms. The optical recording media has the advantages of allowing high-speed recording both with small amounts of energy for recording and with high recording density.
    Type: Grant
    Filed: March 3, 1986
    Date of Patent: July 7, 1987
    Assignee: Mitsubishi Petrochemical Co., Ltd.
    Inventors: Eiichi Hanamura, Yoshinori Tokura, Akio Takada, Akiro Itsubo