Patent ID: 8846298
Filing Date: 2014-09-30
Classification: G11B

Abstract:
1. A recording/reproduction method exhibiting a Low-to-High recording property, the method comprising a step of: performing a recording/reproduction process on an optical recording medium by using a laser having a wavelength that is no greater than 500 nm; wherein the optical recording medium includes a substrate, wherein the substrate has grooves with a groove depth of 55 nm, an organic material layer provided on the substrate and having a thickness of 50 nm to 300 nm, the organic material layer having a light absorption function that is sufficient for recording in a recording/reproduction wavelength range, a reflection layer provided on the organic material layer and having a thickness of from 50 nm to 300 nm, a heat insulating layer provided adjacent to the organic material layer and having a thickness of from 5 nm to 200 nm, and a cover layer; 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; 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.