Patents by Inventor Kanji Sakurai

Kanji Sakurai 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: 4652953
    Abstract: A magnetic head actuating mechanism including a capstan attached to the shaft of a magnetic head driving motor, and an actuator arm supported on a pivot, adapted to be turned through a thin metallic band by the capstan and mounted fixedly at one end thereof with at least one magnetic head. The magnetic head actuating mechanism is designed so that the moment of the unbalanced mass of the turning assembly thereof about the pivot is within the predetermined range. The magnetic head is held stationary even while the magnetic head driving motor is not energized. Thus, the magnetic head actuating mechanism obviates the injurious state of contact between the magnetic head and a magnetic disk easily and need not have any magnetic head locking mechanism.
    Type: Grant
    Filed: March 28, 1985
    Date of Patent: March 24, 1987
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kanji Sakurai, Hideo Tsumura, Chiaki Kawamura
  • Patent number: 4375070
    Abstract: The invention is related to a magnetic head loading and unloading device and includes an electromagnet having a spring loaded armature operative to load a double-sided flexible magnetic recording disc having two associated opposite magnetic heads and resiliently unloading the magnetic heads from the recording disc. A permanent magnet is connected to the armature and forms a speed sensor with an associated solenoid to sense the loading or an unloading speed of the magnetic heads. The solenoid includes an output connected to a negative input of a differential amplifier which includes a positive input comprising a command loading signal. The amplifier output is connected to a winding for exciting the electromagnet through an emitter grounded transistor.
    Type: Grant
    Filed: September 30, 1980
    Date of Patent: February 22, 1983
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shin Isozaki, Masaru Sasaki, Kanji Sakurai
  • Patent number: 4306258
    Abstract: A magnetic head supporting mechanism equipped with a magnetic head positioning carriage of a interchangeable double side type flexible disc drive apparatus comprising a carriage having a pair of arms which is rotated in detachable to a double side type flexible disc and arms, and arm parts in the arms and sliding type magnetic heads which are respectively mounted on the arm part and slide on the surface of the flexible disc and gimbal spring placed between each sliding type magnetic head and each arm part.
    Type: Grant
    Filed: June 14, 1979
    Date of Patent: December 15, 1981
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Noboru Higashiyama, Shin Isozaki, Kanji Sakurai, Masaru Sasaki
  • Patent number: 4218714
    Abstract: A double side type flexible magnetic disc drive apparatus comprises a damper which imparts a damping force being proportional to the shifting speed and is held between a head shifting mechanism and a stationary part whereby damage of a flexible magnetic recording medium caused by shifting the heads can be decreased to prolong the life of the recording medium and the time required for reaching stable contacting of the heads with the recording medium can be shortened.
    Type: Grant
    Filed: October 17, 1978
    Date of Patent: August 19, 1980
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shin Isozaki, Kanji Sakurai