OPTICAL INFORMATION RECORDING MEDIUM AND RECORDING/REPRODUCING METHOD THEREFOR

摘要

An optical information recording medium includes a first substrate; a second substrate; and a recording layer formed between the first substrate and the second substrate. The optical information recording medium includes lands and grooves, and a distance between a light source of laser light irradiating the optical information recording medium and the lands is larger than a distance between the light source and the grooves. The lands are formed in the optical information recording medium at a pitch of less than or equal to 0.40 mu m. Each land is either in a first state having a first reflectance or in a second state having a second reflectance lower than the first reflectance, and the first state and the second state are reversibly changeable by the irradiation of the laser light.