Patents by Inventor Sadao Hosoi

Sadao Hosoi 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: 4370685
    Abstract: A video tape recording/reproducing apparatus for reproducing video signals recorded in successive parallel tracks on a magnetic tape which is adapted to be longitudinally advanced, includes first and second magnetic heads movable in a direction generally along the tracks for reproducing signals recorded therein, and first and second bi-morph leaves for mounting the magnetic heads and being operative to deflect the first and second heads, respectively, in a direction transverse to the direction along the tracks. During the scanning operation by the respective heads, the first and second bi-morph leaves are supplied with a dithering signal for wobbling the heads transversely with respect to the longitudinal direction of the record tracks, a tracking error signal to correct deviations of the head trace from the tracks to be scanned and a slant angle correction signal to correct any inclination tracking error of the first and second magnetic heads.
    Type: Grant
    Filed: March 13, 1981
    Date of Patent: January 25, 1983
    Assignee: Sony Corporation
    Inventors: Sadao Hosoi, Masayuki Takano
  • Patent number: 4366515
    Abstract: In a video tape recorder which employs a rotary magnetic head secured on a deflectable device, such as a bi-morph leaf, to dynamically perform head tracking during reproduction of previously recorded tracks regardless of the tape transport speed; the height of the magnetic head is detected during recording to produce a feedback control signal which electrically adjusts the height of the magnetic head by deforming the bi-morph leaf to overcome hysteresis deflection of the bi-morph leaf so that the magnetic head is returned to and maintained at a normal height during recording.
    Type: Grant
    Filed: March 13, 1980
    Date of Patent: December 28, 1982
    Assignee: Sony Corporation
    Inventors: Masayuki Takano, Sadao Hosoi, Yuichi Matsushita