Optical information recording medium

Details Optical information recording medium Optical information recording medium

2006-06-27

2006-06-27

Neyzari, Ali (Department: 2655)

Dynamic information storage or retrieval

Storage medium structure

Optical track structure

C369S275400, C369S044130

Reexamination Certificate

active

07068585

ABSTRACT:
In a DVD-R, lands1and grooves2are alternately formed in a spiral configuration; the lands1form projecting parts, and the grooves2form recessed parts2. Recorded information is written into the grooves2, while land pre-pits3are formed in some portions of the lands1. The land pre-pits3form recessed parts, and the respective land pre-pits3cover the entire width of the corresponding land1as shown in the figures. These land pre-pits3are arranged so that a>b>0.5×a, where a is the maximum length of the land pre-pits, and b is the minimum length (ordinarily, the minimum length is the shorter of the lengths b1and b2of the land pre-pits in the circumferential edge portions of the lands (i.e., the boundary portions with the grooves)). Furthermore, the value of a is set at 0.2 μm to 0.4 μm.

REFERENCES:
patent: 6128270 (2000-10-01), Nishikawa
patent: 6167013 (2000-12-01), Ando et al.
patent: 6282166 (2001-08-01), Akiyama et al.
patent: 6487147 (2002-11-01), Miyagawa et al.
patent: WO 02/39441 (2001-11-01), None

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