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Patent Searching and Data


Title:
OPTICAL DISK AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP2001014684
Kind Code:
A
Abstract:

To stabilize the recording and reproducing by providing the embossment pit into which positional information of plural information recording layers is recorded so that one part of the embossment pit of the other layer is positioned within light beams when the light beams are focused on the embossment pit of a certain layer.

First and second embossments pits 3, 7 and first and second phase transition recording areas 4, 8 are respectively formed in first and second information recording layers 1, 5 respectively provided in one side surface of a first substrate and one side surface of the substrate 6 of a second information recording layer. The first and second substrates are stuck with an adhesive 9 in the state that respective information recording layers 1, 5 are faced each other. The light beams 30 focused on the first information recording layer 1 are provided with a spot diameter 33 at the focusing position on the first information recording layer 1 and are provided with the spot diameter 34 on the second information recording layer 5. The first and second embossments pits 3, 7 are arranged so as to exist within the range of the same optical beams 30 even when respective layers are provided with different spot diameters 33, 34.


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Inventors:
Takehara, Shintaro
Hasegawa, Yutaka
Okamoto, Yutaka
Watabe, Kazuo
Application Number:
JP1999000186866
Publication Date:
January 19, 2001
Filing Date:
June 30, 1999
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G11B7/24; G11B7/007; G11B7/09; G11B7/26; G11B27/00; (IPC1-7): G11B7/007; G11B7/09; G11B7/24; G11B7/26; G11B27/00
Attorney, Agent or Firm:
佐藤 一雄 (外3名)