Patents by Inventor Takashi Masaki

Takashi Masaki 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: 9637672
    Abstract: A polyester resin composition comprising: 100 parts by mass of a polyester resin having at least 50% by mass of a glycolic acid resin; and from 0.5 to 50 parts by mass of a carboxylic acid anhydride.
    Type: Grant
    Filed: April 26, 2013
    Date of Patent: May 2, 2017
    Assignee: KUREHA CORPORATION
    Inventors: Takashi Masaki, Masahiro Yamazaki, Takuma Kobayashi, Hiroyuki Sato
  • Publication number: 20150361326
    Abstract: A well treatment fluid material comprising 100 parts by mass of polyester resin containing 50% by mass or more of a lactic acid resin and at least one of the degradation accelerators of 0.01 to 10 parts by mass of an organophosphorus compound and 10 to 50 parts by mass of a carboxylic acid anhydride.
    Type: Application
    Filed: January 14, 2014
    Publication date: December 17, 2015
    Inventors: TAKASHI MASAKI, TAKUMA KOBAYASHI, MASAHIRO YAMAZAKI, HIROYUKI SATO
  • Publication number: 20150051119
    Abstract: A polyester resin composition comprising: 100 parts by mass of a polyester resin having at least 50% by mass of a glycolic acid resin; and from 0.5 to 50 parts by mass of a carboxylic acid anhydride.
    Type: Application
    Filed: April 26, 2013
    Publication date: February 19, 2015
    Inventors: Takashi Masaki, Masahiro Yamazaki, Takuma Kobayashi, Hiroyuki Sato
  • Patent number: 7345972
    Abstract: A storage apparatus rotates an optical recording medium at two or more kinds of rotational speeds. The rotational speed is decreased when a read or write margin becomes less than or equal to a first predetermined value or, when a frequency of generation of a servo abnormality of a tracking servo and/or a focus servo is greater than or equal to a first predetermined frequency. On the other hand, the rotational speed is increased when the read or write margin becomes greater than or equal to a second predetermined value or, when the frequency of generation of the servo abnormality of the tracking servo and/or the focus servo is less than or equal to a second predetermined frequency.
    Type: Grant
    Filed: July 5, 2005
    Date of Patent: March 18, 2008
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Toru Ikeda, Shigenori Yanagi
  • Patent number: 7072252
    Abstract: The present invention provides a low-cost optical recording device that determines an optimum quantity of light for recording and reproducing, and an optimum focus offset value. The present invention also relates to a method of determining such an optimum focus offset value. The optical recording device is equipped with a focus control system for performing a focus control operation to focus light from a light source onto a recording face of an optical recording medium.
    Type: Grant
    Filed: September 17, 2002
    Date of Patent: July 4, 2006
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Toru Ikeda
  • Patent number: 7065012
    Abstract: An optical storage device decreases the influence of return light to the laser light source and prevents an increase of power consumption even if high frequency superimposing is performed. The optical storage device applies drive current, to which a high frequency signal is superimposed, to the laser light source, and reads/writes data from/in the storage medium. The high frequency superimposing is set to OFF as a default to save power consumption, and high frequency superimposing is turned ON only when it is judged that servo is unstable, and high frequency superimposing is turned OFF when it is judged that servo is stable.
    Type: Grant
    Filed: February 14, 2003
    Date of Patent: June 20, 2006
    Assignee: Fujitsu Limited
    Inventor: Takashi Masaki
  • Patent number: 7046603
    Abstract: There is disclosed an information storage apparatus in which even when a remaining power of a battery or a galvanic cell is low, an information recording medium can safely be removed. An MPU, a spindle motor driver, and a spindle motor constitute a decelerator for decelerating rotation of the information recording medium, and as a deceleration mode, a first deceleration mode with a relatively large power consumption and a second deceleration mode with a relatively small power consumption are used. The MPU monitors a voltage of a power supply line via a DSP, decelerates the rotation of the information recording medium in the first deceleration mode when the voltage exceeds a predetermined level, and decelerates the rotation of the information recording medium in the second deceleration mode when the voltage indicates the predetermined level or less.
    Type: Grant
    Filed: January 22, 2001
    Date of Patent: May 16, 2006
    Assignee: Fujitsu Limited
    Inventors: Hideshi Mochizuki, Takashi Masaki
  • Patent number: 7031242
    Abstract: A storage apparatus rotates an optical recording medium at two or more kinds of rotational speeds. The rotational speed is decreased when a read or write margin becomes less than or equal to a first predetermined value or, when a frequency of generation of a servo abnormality of a tracking servo and/or a focus servo is greater than or equal to a first predetermined frequency. On the other hand, the rotational speed is increased when the read or write margin becomes greater than or equal to a second predetermined value or, when the frequency of generation of the servo abnormality of the tracking servo and/or the focus servo is less than or equal to a second predetermined frequency.
    Type: Grant
    Filed: March 14, 2001
    Date of Patent: April 18, 2006
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Toru Ikeda, Shigenori Yanagi
  • Publication number: 20060018222
    Abstract: There is disclosed an information storage apparatus in which even when a remaining power of a battery or a galvanic cell is little, an information recording medium can safely be taken out. An MPU 12, a spindle motor driver 38, and a spindle motor 40 constitute a decelerator for decelerating rotation of the information recording medium, and as a deceleration mode, a first deceleration mode with a relatively large power consumption and a second deceleration mode with a relatively small power consumption are disposed. The MPU 12 monitors a voltage of a power supply line 13 via a DSP 16, decelerates the rotation of the information recording medium in the first deceleration mode when the voltage exceeds a predetermined level, and decelerates the rotation of the information recording medium in the second deceleration mode when the voltage indicates the predetermined level or less.
    Type: Application
    Filed: September 21, 2005
    Publication date: January 26, 2006
    Applicant: Fujitsu Limited
    Inventors: Hideshi Mochizuki, Takashi Masaki
  • Patent number: 6985419
    Abstract: A tracking control method measures an optimum offset by measuring a light beam irradiation state of a light beam while offsetting a tracking target position of the light beam on a recording medium so that an optimum light beam irradiation state is obtained at the tracking target position, and carries out a tracking control by setting the measured optimum offset.
    Type: Grant
    Filed: January 15, 2002
    Date of Patent: January 10, 2006
    Assignee: Fujitsu Limited
    Inventors: Toru Ikeda, Shigenori Yanagi, Takashi Masaki
  • Publication number: 20050243675
    Abstract: A storage apparatus rotates an optical recording medium at two or more kinds of rotational speeds. The rotational speed is decreased when a read or write margin becomes less than or equal to a first predetermined value or, when a frequency of generation of a servo abnormality of a tracking servo and/or a focus servo is greater than or equal to a first predetermined frequency. On the other hand, the rotational speed is increased when the read or write margin becomes greater than or equal to a second predetermined value or, when the frequency of generation of the servo abnormality of the tracking servo and/or the focus servo is less than or equal to a second predetermined frequency.
    Type: Application
    Filed: July 5, 2005
    Publication date: November 3, 2005
    Inventors: Takashi Masaki, Toru Ikeda, Shigenori Yanagi
  • Publication number: 20040062164
    Abstract: An apparatus automatically controls the laser power of the light source by the feedback output of the APC detector and prevents the increase of laser power due to an abnormality of the APC detector. The automatic power control unit controls the drive amount of the light source by the detection output of the APC detector, which monitors the emission power of the light source, measures the relationship between the APC drive instruction amount and the detection output of the APC detector, and compares this inclination with the inclination at normal time. Also the automatic power control unit compares the error values before and after APC, and detects the change of the quantity of returned light during a predetermined period. As a result, data destruction due to separation, deviation, contamination or deterioration of the APC detector can be prevented effectively.
    Type: Application
    Filed: September 17, 2003
    Publication date: April 1, 2004
    Applicant: FUJITSU LIMITED
    Inventors: Shinji Miyamoto, Yuji Karakawa, Toru Ikeda, Takashi Masaki, Masatsugu Nishida
  • Publication number: 20030231563
    Abstract: An optical storage device decreases the influence of return light to the laser light source and prevents an increase of power consumption even if high frequency superimposing is performed. The optical storage device applies drive current, to which a high frequency signal is superimposed, to the laser light source, and reads/writes data from/in the storage medium. The high frequency superimposing is set to OFF as a default to save power consumption, and high frequency superimposing is turned ON only when it is judged that servo is unstable, and high frequency superimposing is turned OFF when it is judged that servo is stable.
    Type: Application
    Filed: February 14, 2003
    Publication date: December 18, 2003
    Applicant: FUJITSU LIMITED
    Inventor: Takashi Masaki
  • Patent number: 6633523
    Abstract: An optical memory apparatus has an offset inserting unit for inserting a predetermined offset to the focus error signal, and a focus servo pull-in determining unit for inserting, when the focus servo control unit executes focus servo pull-in, offset to the focus error signal, detecting level change of the focus error signal and determining success or failure of focus servo pull-in.
    Type: Grant
    Filed: April 4, 2000
    Date of Patent: October 14, 2003
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Toru Ikeda
  • Publication number: 20030161229
    Abstract: The present invention provides a low-cost optical recording device that determines an optimum quantity of light for recording and reproducing, and an optimum focus offset value. The present invention also relates to a method of determining such an optimum focus offset value. The optical recording device is equipped with a focus control system for performing a focus control operation to focus light from a light source onto a recording face of an optical recording medium.
    Type: Application
    Filed: September 17, 2002
    Publication date: August 28, 2003
    Applicant: FUJITSU LIMITED
    Inventors: Takashi Masaki, Toru Ikeda
  • Patent number: 6526014
    Abstract: A division test write processing unit is provided and a test writing process for deciding an optimum light emitting power by executing a test writing on a medium is divided into a plurality of division test writing processes. When an upper command is received, in the division test write processing unit, a division control unit skips to a division executing unit locating at the head of the processes which are not yet executed among a plurality of division executing units and allows the dividing processes of the test writing to be executed for a predetermined time.
    Type: Grant
    Filed: July 2, 2001
    Date of Patent: February 25, 2003
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Shigenori Yanagi
  • Patent number: 6522606
    Abstract: A servo control apparatus of an optical pickup in which an offset and a gain can be adjustable for each servo control apparatus, and influences caused by changes in environmental conditions and changes with time are reduced without a decrease in operational speed, and increase in size and an increase in cost is disclosed. The servo control apparatus includes a nonvolatile memory for storing compensatory values which correspond to differences of servo characteristics of each servo apparatus and which are measured with the assistance of external measurement instruments, and a compensation portion for compensating an optical pick-up servo signal according to the compensatory values stored in the nonvolatile memory.
    Type: Grant
    Filed: April 7, 1995
    Date of Patent: February 18, 2003
    Assignee: Fujitsu Limited
    Inventors: Shigeyoshi Tanaka, Toru Ikeda, Shigenori Yanagi, Takashi Masaki
  • Patent number: 6515949
    Abstract: When a migration is predicted and judged of continuous recording and regeneration to an adjacent next optimum condition effective area in the course of data sequential processing for recording or regenerating data continuous in a certain optimum condition effective area, a setting control unit performs optimum condition setting processing (erase, recording, regeneration) of the next optimum condition effective area under the control of an optimum condition setting processing unit, to thereby previously determine the optimum emission power and the optimum magnetic field.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: February 4, 2003
    Assignee: Fujitsu Limited
    Inventors: Takashi Masaki, Shigenori Yanagi
  • Publication number: 20020181347
    Abstract: A tracking control method measures an optimum offset by measuring a light beam irradiation state of a light beam while offsetting a tracking target position of the light beam on a recording medium so that an optimum light beam irradiation state is obtained at the tracking target position, and carries out a tracking control by setting the measured optimum offset.
    Type: Application
    Filed: January 15, 2002
    Publication date: December 5, 2002
    Applicant: FUJITSU LIMITED
    Inventors: Toru Ikeda, Shigenori Yanagi, Takashi Masaki
  • Patent number: 6478596
    Abstract: A semiconductor component mounting apparatus for mounting a semiconductor component to test the electric characteristics of the semiconductor component, comprising: a contactor 20 with which the semiconductor component contacts; a substrate 30 which supplies an electric signal to the contractor 20; a plurality of connection components 40, each of which has an electric terminal 48 for supplying the electric signal to the substrate 30 and which is fixed to the substrate 30; a plurality of connectors 50 which has a contact pin 70 including a contact part 74 for contacting with the electric terminal 48 of the connection component 40, a housing 68 for holding the contact pin 70, a pushing apart 78 for pushing the contact pin 70 to the electric terminal 48, and which is freely-detachably connected to one of the plurality of the connection components 40; a holder 80 which holds the plurality of the connectors 50; and a fixing part 86 which fixes the holder 80 to the substrate 30, wherein the contact part 74 slides a
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: November 12, 2002
    Assignees: Advantest Corporation, AMP (Japan) Ltd. I
    Inventors: Kenji Yoshida, Takashi Naito, Shigeru Murayama, Katsuhiko Sakamoto, Takashi Masaki