OPTICAL RECORDING MEDIUM OPTICAL RECORDING METHOD OPTICAL REPRODUCING METHOD OPTICAL RECORDING DEVICE OPTICAL REPRODUCING DEVICE AND OPTICAL RECORDING/REPRODUCING DEVICE

摘要

An optical recording medium having an information layer in which an information recording portion is formed by a change in physical shape in at least one of a thickness direction and a track width direction which carries information on a gas and in which a reflection film is formed, The reflectance of the unrecorded state with respect to the readout light is R₀, The reflectance of the recording state is R_OneIn this case,;0.5 [%] (R₀-R_One| / R₀) 100 [%] 17 [%];, Which can be manufactured at low cost and further enables additional writing.