OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM DRIVE DEVICE,申请号WO2009JP68499-传众专利搜索

OPTICAL INFORMATION RECORDING MEDIUM AND OPTICAL INFORMATION RECORDING MEDIUM DRIVE DEVICE

申请公布号：WO2010050506(A1)

申请号：WO2009JP68499

申请日期：2009.10.28

申请公布日期：2010.05.06

申请人：

SHARP KABUSHIKI KAISHA;TAJIMA, HIDEHARU;MAEDA, SHIGEMI;HARADA, YASUHIRO;HAYASHI, TETSUYA;ETOH, ATSUSHI;YAMAMOTO, MASAKI

发明人：TAJIMA, HIDEHARU;MAEDA, SHIGEMI;HARADA, YASUHIRO;HAYASHI, TETSUYA;ETOH, ATSUSHI;YAMAMOTO, MASAKI

分类号：G11B7/24;G11B7/005;G11B7/125;G11B7/24038;G11B7/243;G11B7/257;G11B7/258;G11B7/259

主分类号：G11B7/24

摘要：<p>Disclosed is an optical information recording medium which has a structure whereby a light-transmitting layer (10A), a first information recording layer (20), an intermediate layer (30), a third information recording layer (60), an intermediate layer (30), a second information recording layer (40), and a substrate (50) are stacked in this order from the incident surface of reproduced light. The first information recording layer (20) is translucent, the reflectance for the reproduced light wavelength of the first information recording layer (20) is greater than 0.4% and not greater than 2.2%, and when the thickness of the light-transmitting layer (10A) is t and the reflectance for the reproduced light wavelength of the first information recording layer (20) is R2, the value of the reflectance R1 for the reproduced light wavelength on the surface of the light-transmitting layer (10A) is set such that equation 1 is true.Thus, reproduction is possible even with a drive device compatible with an old standard optical information recording medium with few information recording layers, and the recording capacity of the old standard optical information recording medium can be improved by adding a ROM layer or an R layer.</p>