Method for identifying double-layer disc and optical disc...

Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval

Reexamination Certificate

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Reexamination Certificate

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07613091

ABSTRACT:
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.

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K. Nishiuchi et al., “Dual-Layer Optical Disk with Te-O-Pd Phase-Change Film,” Jpn. J. Appl. Phys., vol. 37, Part 1, No. 4B, Apr. 1998, Tokyo, Japan, pp. 2163-2167.
K. Nagata et al., “Rewritable Dual-Layer Phase-Change Optical Disk,” Jpn. J. Appl. Phys., vol. 38, Part 1, No. 3B, Mar. 1999, Tokyo, Japan, pp. 1679-1686.

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