Title:
光ディスク装置およびディスク判別方法
Document Type and Number:
Japanese Patent JP4067536
Kind Code:
B2
Abstract:
The number of recording layers of the loaded disc is determined using the blue laser light. If the number of recording layers is two, drawing is performed in the recording layer on the near side when seen from the laser light entering side, and demodulation is performed with the HDDVD decoder. If demodulatable, the disc is determined as a disc in which two HDDVD layers are arranged. If not demodulatable, determination is made on whether or not the data of the recording layer is demodulatable with the DVD decoder. If demodulatable with the DVD decoder, the laser light is switched to the red laser light and the number of recording layers is determined. If two recording layers are detected in this determination, the disc is determined as a disc in which two DVD layers are arranged. On the other hand, if one recording layer is detected, the disc is determined as a hybrid HDDVD in which one HDDVD layer and one DVD layer are arranged.
Inventors:
Mamiya Noboru
Application Number:
JP2005137937A
Publication Date:
March 26, 2008
Filing Date:
May 10, 2005
Export Citation:
Assignee:
Sanyo Electric Co., Ltd.
International Classes:
G11B7/004; G11B7/007; G11B7/24; G11B19/12
Domestic Patent References:
| JP2005056543A | ||||
| JP10097755A | ||||
| JP2005285212A | ||||
| JP2006268996A |
Attorney, Agent or Firm:
Masamasa Shibano