Optical disk apparatus and disk identification method
AssigneeHitachi, Ltd.
InventorsHideki Maruyama, Yukinobu Tanaka
Life of this patent
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Abstract
A highly reliable optical disk apparatus adapted to record and reproduce the information in and from plural types of optical disks is disclosed. An acquisition unit acquires a predetermined signal from the reflected light obtained by radiating a predetermined laser on each of the optical disks. A comparator compares the waveform of the signal acquired by the acquisition unit with the comparative waveform of the signal stored in a memory beforehand and obtained from the radiated laser corresponding to the optical disk. An identification unit identifies the type of the optical disk based on the result of comparison by the comparator.
Claims16
An optical disk apparatus for recording and/or reproducing information in and/or from a plurality of types of optical disks, comprising:
- an acquisition unit configured to acquire a predetermined type of signal from reflected light obtained by radiating a predetermined type of laser on an optical disk;
- a comparator configured to perform a comparison of the waveform of the signal acquired by the acquisition unit with a comparative waveform of the signal, each comparative waveform obtained by radiating a predetermined type of laser on a predetermined type of optical disk, and each comparative waveform being stored in a memory before use in a comparison;
- and
- an identification unit configured to identify the type of the optical disk based on the result of at least one comparison performed by the comparator, the identification unit using at least one coincidence degree value;
- wherein each coincidence degree value is based on a difference between a time function of the waveform of the signal acquired by the acquisition unit, and a time function of a comparative waveform used in the at least one comparison.
A disk identification method for an optical disk apparatus to record and/or reproduce the information in and/or from a plurality of types of optical disks, comprising:
- a first step executed by an acquisition unit, of acquiring a predetermined type of signal from reflected light obtained by radiating a predetermined type of laser on an optical disk of an unknown type;
- a second step executed by a comparator, of performing at least one comparison of the waveform of the signal acquired in the first step with a comparative waveform of the signal stored in a memory, each comparative waveform obtained by radiation of a predetermined type of laser on a predetermined type of optical disk;
- and
- a third step executed by an identification unit, including identifying the type of the optical disk based on the result of at least one comparison performed in the second step, the identification unit using at least one coincidence degree value;
- wherein each coincidence degree value is based on a difference between a time function of the waveform of the signal acquired by the acquisition unit, and a time function of a comparative waveform used in the at least one comparison.
An optical disk apparatus for recording and/or reproducing the information in and/or from a plurality of types of optical disks, comprising:
- an acquisition unit configured to acquire a predetermined type of signal from reflected light obtained by radiating a predetermined type of laser on an optical disk of an unknown type;
- a comparator configured to perform a comparison of the waveform of the signal acquired by the acquisition unit with an ideal waveform of the signal, each ideal waveform obtained by radiating a predetermined type of laser on a predetermined type of optical disk, and each ideal waveform having been stored in a memory before use in a comparison;
- and
- an identification unit configured to identify the type of the optical disk based on the result of at least one comparison performed by the comparator, the identification unit using at least one coincidence degree value;
- wherein each coincidence degree value is based on a difference between a time function of the waveform of the signal acquired by the acquisition unit, and a time function of an ideal waveform used in the at least one comparison.
Dependencies are inferred from the claim text.