Title:
光学記録媒体および光ディスク装置
Document Type and Number:
Japanese Patent JP4161716
Kind Code:
B2
Abstract:
The present invention provides an optical recording medium and an optical disk device realizing prevention of crosswrite and uniformity of playback signals and capable of easily securing compatibility with a read only disk. It provides an optical recording medium on which light LB condensed by a lens (12, 14) having a numerical aperture of 0.85±0.1 and a wavelength of 405±5 nm is focused for recording or playback, having a substrate 1 formed with a groove 2 in its surface, an optical recording layer 3 formed on the substrate and having topography corresponding to the groove, and a light transmission type protection layer 4 formed on the optical recording layer; used when light for recording or playback is focused from the protection layer side to the optical recording layer; using as a recording area only the optical recording layer of one of a side far from the emitting side of the light for recording or playback, that is, a portion corresponding to a recessed portion of the topography, and a side close to it, that is, a portion corresponding to a projecting portion; having a track pitch of 0.32±0.01 µm; and having a depth D2 of a recessed portion with respect to a projecting portion in the range of 19 to 24 nm.
Inventors:
Isao Ichimura
Kiyoshi Osato
Atsushi Nakano
Shin Masuhara
Kiyoshi Osato
Atsushi Nakano
Shin Masuhara
Application Number:
JP2002543435A
Publication Date:
October 08, 2008
Filing Date:
November 20, 2001
Export Citation:
Assignee:
ソニー株式会社
International Classes:
G11B7/24079; G11B7/004; G11B7/007; G11B7/24082; G11B7/24085; G11B7/26
Domestic Patent References:
| JP2000298878A | ||||
| JP10214438A | ||||
| JP11120621A | ||||
| JP11296911A | ||||
| JP10172183A | ||||
| JP11039655A | ||||
| JP8315424A | ||||
| JP2000215519A |
Attorney, Agent or Firm:
Takahisa Sato