Patent ID: 8859184

Claim:
An optical recording medium exhibiting a Low-to-High recording property consisting essentially of: a substrate, an organic material layer, a heat insulating layer, a reflection layer, and a cover layer; wherein the organic material layer is provided on the substrate and has a thickness of 50 nm to 300 nm, and has a light absorption function that is sufficient for recording in the recording/reproduction wavelength range; wherein the reflection layer is provided on the organic material layer and has a thickness of from 50 nm to 300 nm; and wherein the heat insulating layer is provided between the organic material layer and the reflection layer and has a thickness of from 5 nm to 200 nm; wherein an unrecorded part of the optical recording medium is configured to exhibit a reflectivity that is lower than a reflectivity of a recorded part of the optical recording medium and wherein the recording/reproduction characteristics are obtained in a blue laser wavelength range operating at a wavelength range of no more than 500 nm; wherein the light absorption function of the organic material layer is provided solely by a material consisting of a single organic material having: a first absorption band situated toward a long wavelength side with respect to the recording/reproduction wavelength range, a second absorption band that does not belong to the first absorption band, the second absorption band situated in the vicinity of the recording/reproduction wavelength range, and a third absorption band situated toward a short wavelength side with respect to the recording/reproduction wavelength range, the third absorption band exhibiting an absorption greater than an absorption of the first absorption band, wherein the third absorption band has a largest absorption wavelength that is no greater than 300 nm, wherein the optical recording medium provides low-to-high recording at a recording power range of from 2 mW to 11 mW at a linear recording speed of 6 m/sec.