| Original document(18 pages) 中文版 |
The object of the present invention is to enable the identification of double-layer disc type (recordable double-layer disc, rewritable double-layer disc and ROM-type double-layer disc) to be easily and accurately performed. The method for identifying double-layer disc contains obtaining a reflectance of each light by irradiating light of different wavelengths under focused state to each layer of a double-layer disc loaded in an optical apparatus, and identifying if the double-layer disc is a recordable double-layer disc, a rewritable double-layer disc or a ROM-type double-layer disc corresponding to the combination of reflectance of each obtained light. It is preferable that the wavelength of one light is a wavelength for DVD-based disc and the wavelength of the other light is a wavelength for CD-based disc. |
Application Number
申请号 |
200480020897 |
Application Date
申请日 |
2004.07.21 |
| Title 名称 |
Method for identifying double-layer disc and optical disc apparatus |
Publication Number
公开号 |
1826638 |
Publication Date
公开日 |
2006.08.30 |
| Approval Pub. Date |
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Granted Pub. Date |
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| International Classification 分类号 |
G11B7/004,G11B19/12,G11B7/24 |
Applicant(s) Name
申请人 |
Ricoh KK |
| Address 地址 |
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| Inventor(s) Name 发明人 |
Shinotsuka Michiaki, Iwasa Hiroyuki |
| Attorney & Agent 代理人 |
shao yali lu xiaozhang |
| More information 更 多 信 息 |
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