Patents by Inventor Michihara Abe

Michihara Abe 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).

  • Optical disc recording/reproducing control
    Patent number: 5105416
    Abstract: An optical disc is divided into a plurality of sectors each of which includes an address section, a flag section and a data section. First sector management data are stored in the flag section, normally in the form of a flag pit. In one aspect of the invention, the first sector management data are recorded in the flag section at higher laser beam power than the power used for recording data in the data section. In another aspect of the invention, second sector management data are additionally stored in the data section in the form of a special pattern. In this case, the second sector management data are read out if no sector management data have been read from the flag section of the sector.
    Type: Grant
    Filed: March 14, 1989
    Date of Patent: April 14, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideki Segawa, Michihara Abe