MULTILAYERED OPTICAL DISK

WIPO Patent Application WO/2001/018799

A1

A multilayered optical disk having a plurality of information recording layers having the same reading-light incident surface, at least one information recording layer being capable of optically recording, wherein, a mirror-region taking-up proportion layer in the vicinity of an uneven address block than in a data region increases reflectance. Therefore, when a proportion occupied by an address region in a light spot to be shone on a layer other than a reproduction layer is large when data is to be reproduced, local variations occur in a reproduction signal to make it impossible to reproduce data correctly. The provision of a dummy groove or uneven pit row in the vicinity of an address block can reduce a mirror region in the vicinity of the address block and lower reflectance to thereby reduce local variations caused by an address region.

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SHOJI MAMORU (JP)
NAKAMURA ATSUSHI (JP)
ISHIDA TAKASHI (JP)
DEGUCHI HIRONORI (JP)

PCT/JP2000/005952

March 15, 2001

September 01, 2000

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MATSUSHITA ELECTRIC IND CO LTD (JP)
SHOJI MAMORU (JP)
NAKAMURA ATSUSHI (JP)
ISHIDA TAKASHI (JP)
DEGUCHI HIRONORI (JP)

G11B7/007; G11B7/005; (IPC1-7): G11B7/007; G11B7/24

WO1997015050A1

1997-04-24

JP2000293947A	2000-10-20
EP0426409A2	1991-05-08
JPH10162377A	1998-06-19
JPH06333259A	1994-12-02

Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku, Osaka-shi Osaka, JP)

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