Optical information recording medium, and recording and...

Details Optical information recording medium, and recording and... Optical information recording medium, and recording and...

2006-02-06

2008-12-09

Chen, Tianjie (Department: 2627)

Dynamic optical information storage or retrieval

Optical storage medium structure

C369S275100, C369S275300

Reexamination Certificate

active

07464390

ABSTRACT:
The present invention is to provide a practically usable, recordable or rewritable optical information recording medium having a pair of recording layers and a recording and reproducing apparatus for the medium.The recording medium has a pair of recording layer structures on a substrate so as to sandwich a resin intermediate layer, and a recording beam and a reproducing beam are irradiated to two recording layer structures. The pair of recording layer structures respectively have a different track pitch, and the ratio of difference in the track pitch defined by Expression 1 is +0.03 to +0.15,in-line-formulae description="In-line Formulae" end="lead"?(T2−T1)/T1   Expression 1in-line-formulae description="In-line Formulae" end="tail"?T1represents a track pitch of the recording layer structure disposed on the laser beam irradiation side, and T2represents a track pitch of the recording layer structure disposed on the inner side.

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