Patents Assigned to Hitachi-LG Data Storage, Ltd.
  • Publication number: 20050047300
    Abstract: The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.
    Type: Application
    Filed: October 6, 2004
    Publication date: March 3, 2005
    Applicants: Hitachi, Ltd., Hitachi-LG Data Storage, Ltd.
    Inventors: Kazuhiko Ono, Hirotoshi Fukuda, Takeshi Ikeda