Patents by Inventor Kooetsu Okuyama

Kooetsu Okuyama 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: 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: 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