Patent ID: 9472231
Filing Date: 2016-10-18
CPC Classification: G11B

Claim Text:
1. An optical information recording medium comprising: a recording layer in which at least one recording mark is formed; a super-resolution functional layer that, when irradiated by a laser beam focused by a focusing optical system, enables information to be reproduced from the recording mark having a length shorter than a diffraction limit determined by optical performance of the focusing optical system and wavelength of the laser beam; and a protective layer that covers the recording layer and the super-resolution functional layer and transmits the laser beam; wherein: letting n be the refractive index of the protective layer with respect to the laser beam, λ be the wavelength of the laser beam, and d when irradiated by the focused laser beam, the super-resolution functional layer forms a focused light spot on the recording layer, the focused light spot including central light that irradiates the recording mark and peripheral light that irradiates a region outside the central light, a condition d a condition d