Patents by Inventor Takanobu Kohno

Takanobu Kohno 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).

  • Tape tension control apparatus
    Patent number: 5921493
    Abstract: A tape tension control apparatus for controlling a tension of a tape extended between a pair of reels including a current servo system for adjusting a current of a reel motor in accordance with a diameter of a tape roll wound on a reel, a speed servo system for adjusting a current of the motor so that the rotational speed of the motor exceeds a predetermined value corresponding to the roll diameter, and a changeover device for selecting between said servo systems. The changeover device selects the speed servo system upon activation of the apparatus, after which it selects the current servo system when the current to the motor exceeds a predetermined value.
    Type: Grant
    Filed: July 23, 1997
    Date of Patent: July 13, 1999
    Assignee: Sony Corporation
    Inventor: Takanobu Kohno
  • Tape tension control apparatus
    Patent number: 5746384
    Abstract: A tape tension control apparatus for controlling tape tension by supplying a current to a reel motor for driving a reel in accordance with a diameter of a tape roll includes a: rotational speed detect or for detecting the rotational speed of the tape roll; a rotational speed comparator for comparing a rotational speed detected by the rotational speed detector and a standard rotational speed corresponding to the diameter of the tape roll; and a current correct or for correcting the value of the current supplied to the reel motor in accordance with a comparison result from the rotational speed comparator in such a manner that the speed of rotation of the reel motor becomes equal to the standard rotational speed.
    Type: Grant
    Filed: August 14, 1997
    Date of Patent: May 5, 1998
    Assignee: Sony Corporation
    Inventors: Masaki Yoshizawa, Takanobu Kohno, Satoshi Ota
  • Rotating head type recording/reproducing apparatus which uses wide recording heads to record a single pilot signal over three tracks and preventing overwriting of the pilot signal by the next head scan
    Patent number: 5502603
    Abstract: A recording head Hw1 records a record signal including a data region, a pilot signal region, and a mask region with a width of 3 Tp. A recording head Hw2 overwrites the record region of the head Hw1 with another data. Since the recorded signal includes the mask region, the pilot signal region recorded by the head Hw1 is not erased. The recording head Hw1 overwrites with a record signal. At this point, since the recorded signal contains a mask region, the former pilot signal region is not erased. Instead, a new pilot signal region is formed. By repeating these operations, pilot signal regions are adjacently formed at track edges of a track corresponding to the recording head Hw1. Since the pilot signal is reproduced by a reproducing head with the same azimuth as the recording head, the pilot signal with a short wavelength can be used.
    Type: Grant
    Filed: October 4, 1994
    Date of Patent: March 26, 1996
    Assignee: Sony Corporation
    Inventors: Takanobu Kohno, Tadashi Ozue