OPTICAL INFORMATION MEDIUM

摘要

Disclosed is an optical information medium sequentially comprising a dye recording layer, an adhesive layer and a light-transmitting layer in this order on a groove formed in a substrate, wherein information is recorded or reproduced by having a laser light incident on the in-groove region from the light-transmitting layer side. Such an optical information medium is characterized in that when the depth of the groove is expressed as D (nm) and the width of the groove is expressed as W (nm), D × W is not less than 5,000 nm