Patents by Inventor Mashiro Kawaguchi

Mashiro Kawaguchi 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 type determining method and optical disc device
    Patent number: 7801003
    Abstract: Whether an optical disc is a first optical disc or not is determined with reference to at least one of first and second focus error signal amplitude values. Then, if a sum value of the addition of a first focus balance signal value (CD-FBAL signal value) to a second focus balance signal value (DVD-FBAL signal value) is equal to or more than a predetermined threshold value, the signal surface of the optical disc is determined to be a CD signal surface of a dual disc. On the other hand, if the sum value is smaller than the predetermined threshold value, the signal surface of the optical disc is determined to be a DVD signal surface of a DVD or a DVD signal surface of a dual disc.
    Type: Grant
    Filed: June 3, 2008
    Date of Patent: September 21, 2010
    Assignee: Victor Company of Japan, Limited
    Inventor: Mashiro Kawaguchi