Patent ID: 7556912
Filing Date: 2009-07-07
Classification: B82Y,G11B,Y10S

Abstract:
1. An optical information recording medium, comprising: a thin film section made up of at least one thin film, the thin film section being provided on a substrate, and reflectance of the thin film section changing in accordance with a change of optical multiple interference in the thin film section, said at least one thin film of the thin film section including a single optical interference film in which a complex refractive index changes in accordance with intensity of incident light, thereby triggering the optical multiple interference in the thin film section, and a composition and a thickness of the optical multiple interference film are determined in such a manner as to cause wavelength distribution of reflectance of the thin film section at room temperatures to have a minimum value within ±80 nm of a wavelength of incident light for reproduction, wherein, the optical multiple interference film is a temperature-sensitive film whose complex refractive index changes in accordance with a temperature change, and wherein, regarding the complex refractive index (=n−ki where i is an imaginary number) of the temperature-sensitive film, an extinction coefficient k at room temperatures is within a range of 0≦k≦0.2, and an absolute value of a difference between a refractive index n1 after an application of light and a refractive index n0 at room temperatures meets |n1−n0|>0.02.