OPTICAL INFORMATION MEDIUM MEASURING METHOD, OPTICAL INFORMATION MEDIUM, RECORDING DEVICE AND REPRODUCING DEVICE.

摘要

Provided is an optical information medium measuring method for measuring the modulation degree of an optical information medium which has a multilayer structure having a plurality of information layers.  The method includes: a first step of measuring the modulation degree of each layer of the optical information medium by a measuring optical system; a second step of obtaining the thickness between the layers of the optical information medium; a third step of obtaining the reflectance of each layer of the optical information medium; and a fourth step of converting the modulation degree of each layer measured in the first step into a modulation degree in a reference optical system different from the measuring optical system by using the thicknesses between the layers obtained in the second step and the reflectance of each layer obtained in the third step.