Optical recording medium with high density track pitch and...

Details Optical recording medium with high density track pitch and... Optical recording medium with high density track pitch and...

2005-04-19

2005-04-19

Miller, Brian E. (Department: 2652)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S112240, C369S044130

Reexamination Certificate

active

06882616

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 substrate1formed with a groove2in its surface, an optical recording layer3formed on the substrate and having topography corresponding to the groove, and a light transmission type protection layer4formed 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 D2of a recessed portion with respect to a projecting portion in the range of 19 to 24 nm.

REFERENCES:
patent: 5537373 (1996-07-01), Horikiri
patent: 5742578 (1998-04-01), Kumai et al.
patent: 5844883 (1998-12-01), Kanno et al.
patent: 5933411 (1999-08-01), Inui et al.
patent: 6122233 (2000-09-01), Iketani et al.
patent: 20040202097 (2004-10-01), Oyake et al.
patent: 5-120733 (1993-05-01), None
patent: 2000-298878 (2000-10-01), None

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