Patents by Inventor Tomokazu Ishii

Tomokazu Ishii 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: 10338144
    Abstract: According to an embodiment, a calculation apparatus includes a first calculator, a second calculator and a third calculator. The first calculator performs a regression analysis to calculate internal state parameters including a quantity of active material and an initial charged capacity of at least the first electrode. The second calculator calculates, based on the internal state parameters, an upper limit charged capacity in a predetermined range based a charged capacity at which an open circuit voltage of the rechargeable battery reaches an upper limit voltage. The third calculator changes the quantity of active material of the first electrode to a fixed value, and recalculates the initial charged capacity of the first electrode used on the fixed value and the upper limit charged capacity.
    Type: Grant
    Filed: February 6, 2015
    Date of Patent: July 2, 2019
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Nobukatsu Sugiyama, Ena Ishii, Tomokazu Morita, Mitsunobu Yoshida
  • Patent number: 9617655
    Abstract: An apparatus for SIC single crystal has an induction heating control unit such that frequency f (Hz) of alternating current to the induction heating unit satisfies Formula (1); D1 (mm) is permeation depth of electromagnetic waves into a crucible side wall by the heating unit, D2 (mm) is permeation depth of electromagnetic waves into a SIC solution, T (mm) is thickness of the crucible side wall of the crucible, and R (mm) is crucible inner radius: (D1?T)×D2/R>1.5??(1) where, D1 is defined by Formula (2) and D2 by Formula (3): D1=503292×(1/(f×?c×?c))1/2??(2) D2=503292×(1/(f×?s×?s))1/2??(3); ?c is electric conductivity (S/m) of the sidewall, ?s is electric conductivity (S/m) of the SiC solution; ?c is relative permeability of the sidewall, and ?s is relative permeability of the SIC solution.
    Type: Grant
    Filed: December 26, 2011
    Date of Patent: April 11, 2017
    Assignees: NIPPON STEEL & SUMITOMO METAL CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventors: Nobuhiro Okada, Kazuhito Kamei, Kazuhiko Kusunoki, Nobuyoshi Yashiro, Kouji Moriguchi, Hironori Daikoku, Hiroshi Suzuki, Tomokazu Ishii, Hidemitsu Sakamoto, Motohisa Kado, Yoichiro Kawai
  • Patent number: 9322112
    Abstract: To suppress 3D or convex growth and ensure a high flatness, an apparatus for producing an SiC single crystal includes: a container which holds an SiC solution, a portion for maintaining the solution in the container at a suitable temperature, a shaft having a lower end part acting as a portion for holding an SiC seed crystal in planar contact with an overall back surface of a crystal growth face and acting as a portion for cooling the SiC seed crystal, and a portion of the holding shaft for enabling an SiC single crystal to continuously grow at the crystal growth face by maintaining the crystal growth face brought into contact with the solution, a lower end part of the shaft having a portion for obtaining a uniform in-plane temperature distribution of the crystal growth face brought into planar contact, and a method for the same.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: April 26, 2016
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventors: Tomokazu Ishii, Hidemitsu Sakamoto, Kazuhiko Kusunoki, Kazuhito Kamei
  • Publication number: 20130284083
    Abstract: A manufacturing apparatus for SiC single crystal has a control unit to control induction heating such that frequency f (Hz) of alternating current to be passed to the induction heating unit satisfies Formula (1); D1 (mm) is permeation depth of electromagnetic waves into a side wall of a crucible by the heating unit, D2 (mm) is permeation depth of electromagnetic waves into a SiC solution, T (mm) is thickness of the crucible side wall of the crucible, and R (mm) is crucible inner radius: (D1?T)×D2/R>1??(1) where, D1 is defined by Formula (2), and D2 by Formula (3): D1=503292×(1/(f×?c×?c))1/2??(2) D2=503292×(1/(f×?s×?s))1/2??(3); ?c is electric conductivity (S/m) of the sidewall, ?s is electric conductivity (S/m) of the SiC solution; ?c is relative permeability of the sidewall, and ?s relative permeability of the SiC solution.
    Type: Application
    Filed: December 26, 2011
    Publication date: October 31, 2013
    Applicants: Toyota Jidosha Kabushiki Kaisha, Nippon Steel & Sumitomo Metal Corporation
    Inventors: Nobuhiro Okada, Kazuhito Kamei, Kazuhiko Kasunoki, Nobuyoshi Yashiro, Kouji Moriguchi, Hironori Daikoku, Hiroshi Suzuki, Tomokazu Ishii, Hidemitsu Sakamoto, Motohisa Kado, Yoichiro Kawai
  • Publication number: 20120304916
    Abstract: A method of producing an SiC single crystal is provided in which an SiC single crystal is grown on a first seed crystal held at a lower end of a seed crystal holder, by immersing the first seed crystal in a source material melt in a crucible; this method of producing an SiC single crystal is characterized by carrying out a treatment that promotes the growth of a polycrystal in a region outside the first seed crystal.
    Type: Application
    Filed: February 17, 2011
    Publication date: December 6, 2012
    Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHA
    Inventor: Tomokazu Ishii
  • Patent number: 8305713
    Abstract: This application discloses a Load-UnLoad (LUL) hard disk drive comprising a disk base, a spindle motor mounted on the disk base for rotating at least one disk to create at least one rotating disk surface, and a head stack assembly pivotably coupled to the disk base and configured to engage an actuator latch when the sliders of the head stack assembly are to be parked. The actuator latch includes a latch beam coupled through a latch pivot to the disk base and a boss coupled to the latch beam and configured to limit the stroke of latch motion in the event of a rotary non-operational shock.
    Type: Grant
    Filed: May 6, 2009
    Date of Patent: November 6, 2012
    Assignee: Seagate Technology International
    Inventors: Tomokazu Ishii, Seong Woo Kang, Seungman Chang, Chaw-Wu Tseng
  • Publication number: 20120160153
    Abstract: To suppress 3D or convex growth and ensure a high flatness, an apparatus for producing an SiC single crystal includes: a container which holds an SiC solution, a portion for maintaining the solution in the container at a suitable temperature, a shaft having a lower end part acting as a portion for holding an SiC seed crystal in planar contact with an overall back surface of a crystal growth face and acting as a portion for cooling the SiC seed crystal, and a portion of the holding shaft for enabling an SiC single crystal to continuously grow at the crystal growth face by maintaining the crystal growth face brought into contact with the solution, a lower end part of the shaft having a portion for obtaining a uniform in-plane temperature distribution of the crystal growth face brought into planar contact, and a method for the same.
    Type: Application
    Filed: December 15, 2011
    Publication date: June 28, 2012
    Inventors: Tomokazu ISHII, Hidemitsu Sakamoto, Kazuhiko Kusunoki, Kazuhito Kamei
  • Publication number: 20100284113
    Abstract: This application discloses a Load-UnLoad (LUL) hard disk drive comprising a disk base, a spindle motor mounted on the disk base for rotating at least one disk to create at least one rotating disk surface, and a head stack assembly pivotably coupled to the disk base and configured to engage an actuator latch when the sliders of the head stack assembly are to be parked. The actuator latch includes a latch beam coupled through a latch pivot to the disk base and a boss coupled to the latch beam and configured to limit the stroke of latch motion in the event of a rotary non-operational shock.
    Type: Application
    Filed: May 6, 2009
    Publication date: November 11, 2010
    Inventors: Tomokazu Ishii, Seong Woo Kang, Seungman Chang, Chaw-Wu Tseng
  • Patent number: 7215506
    Abstract: The invention is a hard-disk-drive (HDD) assembly that includes a flame having the exterior dimensions of a particular form-factor HDD, an HDD with a form-factor smaller than the frame, a pair of mount assemblies that support the HDD entirely within the larger form-factor frame, and an electrical cable located entirely within the frame and having one end connected to the HDD and the other end exposed to the frame exterior at the position determined by the specifications of the larger form-factor. The HDD assembly thus presents a smaller form-factor HDD as a fully plug-compatible alternative to a larger form-factor HDD. The mount assemblies have spring-like cantilever arms in contact with damping material to provide a highly-damped nonlinear spring system that provides mechanical-shock resistance for the HDD in a direction normal to the planes of the disks and high stiffness in a direction parallel to the planes of the disks.
    Type: Grant
    Filed: June 30, 2004
    Date of Patent: May 8, 2007
    Assignee: Hitachi Global Storage Technologies Netherlands B.V.
    Inventors: David W. Albrecht, Akihiko Aoyagi, Fu-Ying Huang, Tomokazu Ishii, Qinghua Zeng
  • Publication number: 20060002004
    Abstract: The invention is a hard-disk-drive (HDD) assembly that includes a flame having the exterior dimensions of a particular form-factor HDD, an HDD with a form-factor smaller than the frame, a pair of mount assemblies that support the HDD entirely within the larger form-factor frame, and an electrical cable located entirely within the frame and having one end connected to the HDD and the other end exposed to the frame exterior at the position determined by the specifications of the larger form-factor. The HDD assembly thus presents a smaller form-factor HDD as a fully plug-compatible alternative to a larger form-factor HDD. The mount assemblies have spring-like cantilever arms in contact with damping material to provide a highly-damped nonlinear spring system that provides mechanical-shock resistance for the HDD in a direction normal to the planes of the disks and high stiffness in a direction parallel to the planes of the disks.
    Type: Application
    Filed: June 30, 2004
    Publication date: January 5, 2006
    Inventors: David Albrecht, Akihiko Aoyagi, Fu-Ying Huang, Tomokazu Ishii, Qinghua Zeng
  • Patent number: 6549377
    Abstract: A magnetic disk drive having a disk for storing information, a spindle motor for rotating the disk, a head for recording information into the disk and reproducing information from said disk, a suspension supporting a slider provided with the head, a carriage supporting the suspension, a voice coil motor for exerting a rotational torque to the carriage so as to locate the head on the disk, a base and a cover, and a ramp serving as a guide for unloading the head from the disk. A part of the suspension slides over the ramp so as to effect the unloading operation and the position or the posture of the ramp is changed by sliding movement of the part of the suspension over and with respect to the ramp during the unloading operation.
    Type: Grant
    Filed: February 6, 2002
    Date of Patent: April 15, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Takeshi Yoshida, Tetsuya Hamaguchi, Tomokazu Ishii, Shozo Saegusa, Shinsuke Higuchi
  • Publication number: 20020071219
    Abstract: A magnetic disk drive having a disk for storing information, a spindle motor for rotating the disk, a head for recording information into the disk and reproducing information from said disk, a suspension supporting a slider provided with the head, a carriage supporting said suspension, a voice coil motor for exerting a rotational torque to the carriage so as to locate the head on the disk, a base and a cover, and a ramp serving as a guide for unloading the head from the disk. A part of the suspension slides over the ramp so as to effect the unloading operation and the position or the posture of the ramp is changed by sliding movement of the part of the suspension over and with respect to the ramp during the unloading operation.
    Type: Application
    Filed: February 6, 2002
    Publication date: June 13, 2002
    Inventors: Takeshi Yoshida, Tetsuya Hamaguchi, Tomokazu Ishii, Shozo Saegusa, Shinsuke Higuchi
  • Patent number: 6369988
    Abstract: A magnetic disk drive provided with a loadunload mechanism of the rampload type is disclosed, in which even if loading and unloading operations are frequently repeated, damage to a head due to impingement during the unloading operation is eliminated, and a ramp and the lift-tab of a suspension are less liable to wear, and an operation failure or malfunction due to wear debris is eliminated, thereby providing the drive of high reliability. The ramp is supported for minute displacement, and the posture of the ramp is changed during the unloading operation. The restraining members for restraining the posture of the ramp are provided, and the cushioning members are provided at portions that the ramp and the restraining members come into contact with each other.
    Type: Grant
    Filed: September 8, 1999
    Date of Patent: April 9, 2002
    Assignee: Hitachi, Ltd
    Inventors: Takeshi Yoshida, Tetsuya Hamaguchi, Tomokazu Ishii, Shozo Saegusa, Shinsuke Higuchi
  • Patent number: 5754361
    Abstract: A tape cartridge is received into one end of an information recording and/or reproducing apparatus conforming to an 8 inch Form Factor Size. A first reel is held inside this tape cartridge, and a tape wound onto this first reel is extracted from a cartridge including the first reel and threaded by a simple pivotal motion of a tape threading arm, and wound onto a second reel disposed at the other end of the information recording and/or reproducing apparatus. The pivotal center of the tape threading arm and a recording head are disposed at opposite sides respectively with regard to a line joining a first and second reel axes to facilitate a compact overall construction. Tape guides formed into cylindrical rollers and the recording head are disposed on the inner side of the trajectory of the tape threading to transfer the tape smoothly. The tape guides and the recording head may be arranged substantially in line. Also, the tape guides next to the recording head may be fixed rollers.
    Type: Grant
    Filed: September 20, 1995
    Date of Patent: May 19, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Sakai, Tomokazu Ishii, Tadashi Honzawa, Masaru Orii, Fujio Tajima, Kooetsu Okuyama, Takao Terayama
  • Patent number: 5739976
    Abstract: As a method of increasing the storage capacity of a magnetic recording and reproducing apparatus for recording and reproducing information to and from a magnetic tape in a cartridge, there is a helical scan recording method in which the magnetic tape is diagonally wound around a drum which rotates a magnetic head. With an apparatus adapted to this method, the disposition of the cartridge and the take-up reel for taking up the magnetic tape on the same plane arises a necessity of considerably bending the magnetic tape at the drum portion and, accordingly, the magnetic tape is damaged. In order to prevent the damage of the foregoing type, the tape passage surface from the cartridge to the drum and the tape passage from the drum to the take-up reel are formed by an angle at which the direction in which the magnetic tape is moved is changed due to winding of the magnetic tape around the drum so that the magnetic tape is not bent excessively.
    Type: Grant
    Filed: October 30, 1995
    Date of Patent: April 14, 1998
    Assignee: Hitachi, Ltd.
    Inventors: Kazuo Sakai, Fumio Takeda, Taichiro Yamashita, Fujio Tajima, Takao Terayama, Tomokazu Ishii, Kooetsu Okuyama, Takayuki Munemoto, Nobuyuki Kaku, Kenmei Masuda, Shigeyuki Kobata, Fukuyasu Abe, Kenji Ogiro, Shigemitsu Higuchi
  • Patent number: 5497059
    Abstract: A servo-mechanism control system calculates an operation value to be applied to a control object from a desired value of a control output and a detected control output of the control object, and drives the control object based on the calculated operation value so that the control output becomes equal to the desired value. The control system is less sensitive to the variation of characteristics of the control object and disturbances, and stable control is accomplished by a simple circuit arrangement. A mathematical model and its inverse function, which are based on the assumption that the control system is not subjected to the variation of characteristics of the control object and disturbances, are used to calculate a model-based control output.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: March 5, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Fujio Tajima, Hideki Tanaka, Kooetsu Okuyama, Tomokazu Ishii, Kenji Toki
  • Patent number: 5495371
    Abstract: A magnetic recording and reproducing device and a magnetic tape library device are provided for properly recovering a function and issuing a warning when a failure of a magnetic head of the device takes place because of wear and dirt of the magnetic head. Further, a method for maintaining the magnetic head is provided. A wear sensor and a dirt sensor are prepared for sensing a wear amount of a state of dirt of the magnetic head. A head check controller operates to determine the wear amount of the magnetic head and the state of dirt based on the sensed result. In accordance with the determined result, the warning device is started for taking a precaution of preventing a head failure. As one aspect, the tape library device instructs to load the cleaning tape using a robot.
    Type: Grant
    Filed: November 29, 1993
    Date of Patent: February 27, 1996
    Assignee: Hitachi, Ltd.
    Inventors: Takayuki Munemoto, Kazuo Sakai, Fujio Tajima, Tomokazu Ishii, Fumio Takeda, Kouetsu Okuyama, Takeshi Itoh, Shigeyuki Kobata, Kenmei Masuda, Shigemitsu Higuchi
  • Patent number: 5371449
    Abstract: In a servo system using a discrete signal relative to a position, a time delay and an error upon detecting a speed due to lack of positional information are eliminated to achieve a positioning to a target position in a short time. A pulse signal X.sub.P relative to a position is used to establish synchronization with an observer which is adjusted to match with an actual apparatus comprising a load, a motor and so on, and an estimated speed value or an estimated position value generated by the observer are used to determine an operating signal for the servo system.
    Type: Grant
    Filed: March 19, 1992
    Date of Patent: December 6, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Fujio Tajima, Hideki Tanaka, Kooetsu Okuyama, Tomokazu Ishii, Kenji Toki
  • Patent number: 5352961
    Abstract: A servo-mechanism control system calculates an operation value to be applied to a control object from a desired value of a control output and a detected control output of the control object, and drives the control object based on the calculated operation value so that the control output becomes equal to the desired value. The control system is less sensitive to the variation of characteristics of the control object and disturbances, and stable control is accomplished by a simple circuit arrangement. A mathematical model and its inverse function, which are based on the assumption that the control system is not subjected to the variation of characteristics of the control object and disturbances, are used to calculate a model-based control output.
    Type: Grant
    Filed: September 21, 1992
    Date of Patent: October 4, 1994
    Assignee: Hitachi, Ltd.
    Inventors: Fujio Tajima, Hideki Tanaka, Kooetsu Okuyama, Tomokazu Ishii, Kenji Toki