US 7,057,252 B2 · Optical information recording medium

Abstract

The optical information recording medium of the present invention includes an information layer provided on a substrate. The information layer includes: a recording layer with respect to which information can be recorded and reproduced through irradiation with a laser beam having a predetermined wavelength; a first protective layer that is located, with respect to the recording layer, on the side to which the laser beam is incident; and a second protective layer that is located, with respect to the recording layer, on the opposite side to the side to which the laser beam is incident. The refractive index n1 of the first protective layer and the refractive index n2 of the second protective layer at the predetermined wavelength of the laser beam that is used for recording and reproduction satisfy a relationship of n2<n1.

Claims14

Dependent claims

An optical information recording medium, comprising:

a substrate;
and
an information layer provided on the substrate,
wherein the information layer comprises:
a recording layer with respect to which information can be recorded and reproduced through irradiation with a laser beam having a predetermined wavelength;
a first protective layer that is located, with respect to the recording layer, on a side on which the laser beam is incident;
and
a second protective layer that is located, with respect to the recording layer, on the opposite side to the side to which the laser beam is incident, and
wherein a refractive index n1 of the first protective layer and a refractive index n2 of the second protective layer at the predetermined wavelength of the laser beam satisfy a relationship of n2<n1.

6 more elements

Dependencies are inferred from the claim text.

Optical information recording medium

Life of this patent

Optical information recording medium

Life of this patent

Abstract

Claims14